Jose J Rodes-Roca

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• PhD
• Professor (Associate, full time) at University of Alicante

4U 0114+65 is a high-mass X-ray binary system formed by the luminous supergiant B1Ia, known as V{*} V662 Cas, and one of the slowest rotating neutron stars (NS) with a spin period of about 2.6 hours. This fact provides a rare opportunity to study interesting details of the accretion within each individual pulse of the compact object. In this paper,...

Cen X-3 is a compact, high-mass X-ray binary (HMXRB), likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of a target of opportunity Chandra observation made during a low-flux to high-flux transition. The high-resolution spectra allow us to delve into the events that occurred during this episode. Th...

The bright high-mass X-ray binary GX 301-2 exhibits two periodic flare episodes along its orbit which are produced when the neutron star is close to the apastron and periastron passages. Time-resolved spectra were extracted and several models applied to describe all of them. The best description was obtained with a blackbody continuum modified by t...

Cen X-3 is a compact, high-mass X-ray binary (HMXRB), likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of a target of opportunity \textit{Chandra} observation made during a low-flux to high-flux transition. The high-resolution spectra allow us to delve into the events that occurred during this ep...

The aim of this work is to study both light curve and orbital phase spec-troscopy of Cen X-3 taking advantage of the MAXI/GSC observation strategy. These studies allow delimiting the stellar wind properties and its interactions with the compact object. From the analysis of the light curve, we have estimated the orbital period of the binary system a...

The aim of this work is to study both light curve and orbital phase spectroscopy of this source taking advantage of the MAXI/GSC observation strategy. We have investigated the spectral and light curve properties of the X-ray emission from Cen X-3 along the binary orbit. These studies allow delimiting the stellar wind properties and its interactions...

We present the first XMM-Newton observation of the classical supergiant high-mass X-ray binary XTE J1855−026 taken entirely during the eclipse of the neutron star (NS), covering the orbital phases φ = 0.00–0.11. The analysis of the data allows us to (a) compare with the parameters obtained during the existing pre eclipse observation and (b) explore...

We present the first {\it XMM-Newton} observation of the classical supergiant high-mass X-ray binary XTE J1855$-$026 taken entirely during the eclipse of the neutron star (NS), covering the orbital phases $\phi= 0.00-0.11$. The analysis of the data allows us to a) compare with the parameters obtained during the existing pre eclipse observation and...

It is very common for students of technical degrees to think that solving physics problems consists predominantly of applying a series of formulae and substituting data. In other words, they do not need to understand the physical meaning of an equation. Some experimental studies focusing on basic kinematics have revealed certain shortcomings in the...

Cen X-3 is a compact high mass X-ray binary likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of two pointed XMM-Newton observations. The first one took place during a normal state of the source, when it has a luminosity LX ∼ 1036 erg s−1. This observation covered orbital phases φ = 0.00 − 0.37, i...

Cen X-3 is a compact high mass X-ray binary likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of two pointed XMM-Newton observations. The first one took place during a normal state of the source, when it has a luminosity $L_{\rm X}\sim 10^{36}$ erg s$^{-1}$. This observation covered orbital phases...

El principal objetivo del estudio es diseñar un ejercicio de cinemática y evaluar si hay diferencias significativas en la estrategia de resolución en estudiantes de distintos niveles de grado y/o máster de ingeniería, arquitectura y/o ciencias. Así, podremos comprobar hasta qué punto tener una ecuación en el enunciado del ejercicio y los datos para...

High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted the interest of the high energy astrophysical community since the dawn of X-ray Astronomy. In more recent years, they have challenged our comprehensi...

High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted the interest of the high energy astrophysical community since the dawn of X-ray Astronomy. In more recent years, they have challenged our comprehensi...

The aim of this work is to characterize the counterpart to the INTEGRAL High Mass X-ray Binary candidate IGR J19294+1816 so as to establish its true nature. We obtained H band spectra of the selected counterpart acquired with the NICS instrument mounted on the Telescopio Nazionale Galileo (TNG) 3.5-m telescope which represents the first infrared sp...

The aim of this work is to characterize the counterpart to the INTEGRAL High Mass X-ray Binary candidate IGR J19294+1816 so as to establish its true nature. We obtained H band spectra of the selected counterpart acquired with the NICS instrument mounted on the Telescopio Nazionale Galileo (TNG) 3.5-m telescope which represents the first infrared sp...

Based on new Chandra X-ray telescope data, we present empirical evidence of plasma Compton cooling during a flare in the non pulsating massive X-ray binary 4U1700-37. This behaviour might be explained by quasispherical accretion onto a slowly rotating magnetised neutron star. In quiescence, the neutron star in 4U1700-37 is surrounded by a hot radia...

Based on new Chandra X-ray telescope data, we present empirical evidence of plasma Compton cooling during a flare in the non pulsating massive X-ray binary 4U1700-37. This behaviour might be explained by quasispherical accretion onto a slowly rotating magnetised neutron star. In quiescence, the neutron star in 4U1700-37 is surrounded by a hot radia...

4U0114$+$65 is one of the slowest known X-ray pulsars. We present an analysis of a pointed observation by the XMM-Newton X-ray telescope. The energy-resolved light curve, the time-resolved X-ray spectra provided by the EPIC cameras on board and the first high-resolution spectrum of this source, provided by the Reflection Grating Spectrometer, were...

4U0114$+$65 is one of the slowest known X-ray pulsars. We present an analysis of a pointed observation by the XMM-Newton X-ray telescope. The energy-resolved light curve, the time-resolved X-ray spectra provided by the EPIC cameras on board and the first high-resolution spectrum of this source, provided by the Reflection Grating Spectrometer, were...

We describe the Busot observatory, our project of a fully robotic autonomous telescope. This astronomical observatory, which obtained the Minor Planet Centre code MPC-J02 in 2009, includes a 14 inch MEADE LX200GPS telescope, a 2 m dome, a ST8-XME CCD camera from SBIG, with an AO-8 adaptive optics system, and a filter wheel equipped with UBVRI syste...

We present the discovery of three new W UMa systems by our group as a part of a photometric follow-up of variable stars carried out with the Busot observatory 36 cm robotic telescope in collaboration with the X-ray astronomy group at University of Alicante (Alicante, Spain). Specifically we show the high limiting magnitude to detect moving objects...

La investigación docente se centrará en el seguimiento y coordinación de las acciones de mejora que se pretenden implantar en la titulación del grado en Arquitectura Técnica. El interés de esta red radica en la realización de un seguimiento eficaz de la implementación, la coordinación, evaluación y mejora del Grado que permita proponer acciones de...

En este póster presentamos las líneas de trabajo de la red docente RAFIA: evaluación formativa en la resolución de problemas y prácticas de laboratorio aplicados a situaciones propias de la ingeniería o de la arquitectura, la elaboración de materiales para el autoaprendizaje de la física y la utilización de blogs para las asignaturas de física para...

Classical Supergiant X-ray Binaries (SGXBs) and Supergiant Fast X-ray Transients (SFXTs) are two types of High-mass X-ray Binaries (HMXBs) that present similar donors but, at the same time, show very different behavior in the X-rays. The reason for this dichotomy of wind-fed HMXBs is still a matter of debate. Among the several explanations that hav...

Classical Supergiant X-ray Binaries (SGXBs) and Supergiant Fast X-ray Transients (SFXTs) are two types of High-mass X-ray Binaries (HMXBs) that present similar donors but, at the same time, show very different behavior in the X-rays. The reason for this dichotomy of wind-fed HMXBs is still a matter of debate. Among the several explanations that hav...

We present strategies to discover and characterise optical/infrared unknown counterparts to X-ray binary systems.

We present an analysis of a 78 ks Chandra high-energy transmission gratings observation of the B0I star QV Nor, the massive donor of the wind-accreting pulsar 4U1538-52. The neutron star (NS) orbits its companion in a very close orbit (r < 1.4R∗, in units of the stellar radii), thereby allowing probing of the innermost wind regions. The flux of the...

4U 1538-52, an absorbed high mass X-ray binary with an orbital period of 3.73 days, shows moderate orbital intensity modulations with a low level of counts during the eclipse. Several models have been proposed to explain the accretion at different orbital phases by a spherically symmetric stellar wind from the companion. The aim of this work is to...

La preparación previa del alumnado que cursa la asignatura de Fundamentos Físicos en primer curso de grado implantado en la Escuela Politécnica Superior de la Universidad de Alicante, es muy heterogénea. Además, se da la circunstancia que en los últimos cursos alrededor de un 50% del alumnado no ha cursado nunca una asignatura de física anteriormen...

We present an analysis of the long term X-ray observations of the high-mass X-ray binary 4U 1538-52, a wind accreting neutron star with a supergiant companion. The source was scanned every 90 minutes by the MAXI/GSC on the International Space Station during 5 years. We analyse both the light curves and the orbital phase resolved spectroscopy to stu...

We present a comprehensive analysis of the whole sample of available XMM-Newton observations of High Mass X-ray Binaries (HMXBs) until August, 2013, focusing on the FeK{\alpha} emission line. This line is a key tool to better understand the physical properties of the material surrounding the X-ray source within a few stellar radii (the circumstella...

We present a comprehensive analysis of the whole sample of available XMM-Newton observations of high-mass X-ray binaries (HMXBs) until August 2013, focusing on the FeK alpha emission line. This line is key to better understanding the physical properties of the material surrounding the X-ray source within a few stellar radii (the circumstellar mediu...

High resolution X-ray spectroscopy is a powerful tool for studying the nature of the matter surrounding the neutron star in X-ray binaries and its interaction between the stellar wind and the compact object. In particular, absorption features in their spectra could reveal the presence of atmospheres of the neutron star or their magnetic field stren...

In the framework of an ongoing programme, we have developed strategies to discover and characterize optical/infrared unknown counterparts to X-ray binary systems using the standard tools of the Virtual Observatory. First, we have selected some potential candidates from different X-ray catalogues. Then we have used the Virtual Observatory tools to s...

Cuando finalice el curso 2013-14 se producirá la salida de la primera promoción de graduados en la Escuela Politécnica Superior (EPS). Teniendo en cuenta que antes de que transcurran seis años se debe renovar la acreditación de los títulos oficiales de Grado, consideramos adecuado efectuar un análisis crítico del proceso de enseñanza-aprendizaje. E...

La capacitació per a resoldre problemes de física és molt important en la formació del nostre alumnat. Encara que no tots els coneixements tenen una aplicació directa a situacions reals, la resolució de problemes facilita la comprensió d'un concepte o d'una llei. No podem oblidar que s'han de plantejar problemes de forma que l'alumnat desenvolupe u...

We present analysis of 100 ks contiguous XMM-Newton data of the prototypical wind accretor Vela X-1. The observation covered eclipse egress between orbital phases 0.134 and 0.265, during which a giant flare took place, enabling us to study the spectral properties both outside and during the flare. This giant flare with a peak luminosity of $3.92^{+...

Numerosos estudios han puesto de manifiesto la dificultad del aprendizaje de la física tanto en la educación secundaria y bachillerato como en la educación universitaria. El espacio Europeo de Educación Superior (EEES) pone énfasis en el aprendizaje del alumnado y modifica el rol del profesorado como tutor de su aprendizaje, potenciando la adquisic...

Here we report the infrared identification of the X-ray source 2XMM J191043.4+091629.4, which was detected by XMM-Newton/EPIC in the vicinity of the Galactic supernova remnant W49B. The aim of this work is to establish the nature of the X-ray source 2XMM J191043.4+091629.4 studying both the infrared photometry and spectroscopy of the companion. We...

The improvement of the capabilities of nowadays X-ray observatories, like Chandra or XMM-Newton, offers the possibility to detect both absorption and emission lines and to study the nature of the matter surrounding the neutron star in X-ray binaries and the phenomena that produce these lines. The aim of this work is to discuss the different physica...

We present an analysis of a series of four consecutive Chandra high-resolution transmission gratings observations, amounting to a total of 150 ks, of the Be X-ray source HD 119682 (=1WGA J1346.5–6255), a member of the new class of γ Cas analogs. The Chandra light curve shows significant brightness variations on timescales of hours. However, the spe...

RESUMEN (ABSTRACT) Como resultado de una larga trayectoria de trabajo en diferentes redes de investigación anteriores sobre las asignaturas de Física Aplicada en las titulaciones de Ingeniería en la Escuela Politécnica Superior (EPS), se dispone actualmente de una gran cantidad de material elaborado por los profesores de las asignaturas (material e...

We present the X-ray spectroscopy study of three high mass X-ray binary systems, Vela X-1, Cen X-3 and V0332+53 using data obtained with Swift/XRT. The continuum emission of Vela X-1 is consistent with two absorbed power laws, each of them modified by different absorbing columns and with the same power law index. Moreover, the high energy part of t...

En el presente proyecto hemos desarrollado un sistema de evaluación integral para las asignaturas de Física y Óptica del Grado en Ingeniería en Sonido e Imagen de la Universidad de Alicante. Nuestro sistema de evaluación contempla tres etapas fundamentales: una evaluación inicial para detectar las ideas previas del alumnado favoreciendo su otivació...

We present an orbital phase resolved spectroscopy analysis to discuss the presence of iron emission lines both in and out of eclipse in the energy range from 5.9 to 7.8 keV. Here we concentrate on the study of discrete features on the iron Kalpha line region, using the EPIC/PN instrument on board XMM-Newton observatory. We modelled the Fe complex w...

Póster presentado en las III Jornadas de Innovación Tecnológico Educativa, Universidad de Alicante, 2 de febrero de 2006. Este trabajo ha sido subvencionado por el Vicerrectorado de Convergencia Europea y Calidad (convocatoria 2003-04) y por el Vicerrectorado de Tecnología e Innovación Educativa (convocatoria 2004-05) de la Universidad de Alicante.

Context. The properties of the X-ray emission lines are a fundamental tool for studying the nature of the matter surrounding the neutron star and the phenomena that produce these lines. Aims. The aim of this work is to analyze the X-ray spectrum of 4U 1538-52 obtained by the XMM-Newton observatory and to look for the presence of diagnostic lines in...

In this paper, we analyze the relation between the surface curvature of an isolated charged conductor and resultant electrostatic potential. The study will be performed for a long conductor with uniform cross section. It will be demonstrated by geometric arguments that a correlation between curvature and potential exists. This relation will be obta...

Next academic year 2010/2011 next degrees will begin in the University of Alicante. In particular, in the Polytechnic High School will start 7 new degrees adequate to the “Real Decreto 1393/2007”. Recently Spanish government has described the new legislation to organize the new university degrees according the European Higher Education Area. The re...

We have used the Rossi X-ray Timing Explorer (RXTE) observatory to an-alyze the persistent X-ray source 4U 1538–52/QV Nor. The RXTE satellite observed close to one complete binary orbit on January 1997 and 2001 of this X-ray binary system. We have obtained orbital phase resolved spectra to investigate changes in the absorption column density with o...

In a previous short communication [A. Beléndez, E. Fernández, J.J. Rodes, R. Fuentes, I. Pascual, Phys. Lett. A 373 (2009) 735] the nonlinear oscillations of a punctual charge in the electric field of a charged ring were analyzed. Approximate frequency–amplitude relations and periodic solutions were obtained using the harmonic balance method. Now w...

Cyclotron resonant scattering features are an essential tool for studying the magnetic field of neutron stars. The fundamental line provides a measure of the field strength, while the harmonic lines provide information about the structure and configuration of the magnetic field. Until now only a handful of sources are known to display more than one...

We present pulse phase averaged spectra of the high mass X-ray binary pulsar 4U 1538-52/QV Nor. Observations of this persistent accreting pulsar were made with the Rossi X-ray Timing Explorer (RXTE). We study the variability of cyclotron resonant scattering feature (CRSF or simply cyclotron line) in the high energy spectra of this binary system. We...

In their comment, Qing-Yin and Pei derived another analytical approximate expression for the large-angle pendulum period, which they compare with other expressions previously published. Most of these approximate formulas are based on the approximation of the original nonlinear differential equation for the simple pendulum motion. However, we point...

The analytical approximate technique developed by Wu et al for conservative oscillators with odd nonlinearity is used to construct approximate frequency-amplitude relations and periodic solutions to the dynamically shifted oscillator. This nonlinear oscillator is described by an equation of motion which includes a linear restoring force and an anti...

An approximation scheme to obtain the period for large amplitude oscillations of a simple pendulum is analysed and discussed. The analytical approximate formula for the period is the same as that suggested by Hite (2005 Phys. Teach. 43 290), but it is now obtained analytically by means of a term-by-term comparison of the power-series expansion for...

The harmonic balance method is used to construct approximate frequency–amplitude relations and periodic solutions to an oscillating charge in the electric field of a ring. By combining linearization of the governing equation with the harmonic balance method, we construct analytical approximations to the oscillation frequencies and periodic solution...

We present an analysis of archival RXTE data of the X-ray binary source 4U 1538−52/QV Nor. The RXTE ob-servatory made one complete binary cycle observation on January 1997 and 2001, respectively. The X-ray con-tinuum data are well described by an absorbed Nega-tive Positive power laws Exponentials (NPEX) compo-nent modified by an iron emission line...

Durante el curso 2005-06 se puso en marcha la asignatura de Fundamentos Físicos de las Técnicas en el segundo ciclo de la titulación de Ingeniería Superior de Caminos, Canales y Puertos en la Escuela Politécnica. Las dificultades previstas para el desarrollo de la asignatura nos condujeron a facilitar el trabajo docente y el aprendizaje de la mater...

Se presenta el trabajo de innovación desarrollado con la elaboración de materiales docentes útiles en el aprendizaje de los contenidos de mecánica de las asignaturas de Fundamentos Físicos de diversas titulaciones, con el interés de mejorar los resultados del aprendizaje y evitar el importante fracaso académico que presentan estas asignaturas. Hemo...

La implicació de l'alumnat en el procés d'ensenyament/aprenentatge (E/A) ha permés desenvolupar un conjunt d'accions per afavorir el treball autònom i el seu seguiment tutorial. S'ha oferit un compromís voluntari per a realitzar treballs presencials i no presencials (resolució de problemes) i el seguiment individual de les activitats planejades mit...

El canvi de model educatiu que implica la integració del sistema universitari espanyol en l’Espai Europeu d’Educació Superior (EEES) implica centrar la docència en l’aprenentatge de l’alumnat. Per tant, com que una part important en aquest aprenentatge és el treball i l’esforç de l’alumnat, hem desenvolupat metodologies actives per afavorir-lo. En...

Este trabajo presenta la primera experiencia de funcionamiento de una asignatura correspondiente al segundo ciclo de la titulación de Ingeniería de Caminos. Las especiales características de la asignatura y del grupo de alumnos al que se impartió, planteaban dificultades para el normal desarrollo de la asignatura. Surgió así la necesidad de elabora...

INTRODUCCIÓN La utilización de películas de corta duración sobre experimentos de Física presenta un gran potencial didáctico al poder los estudiantes visualizar fenómenos físicos explicados en las clases de teoría y realizados en el laboratorio. En este trabajo se presentan los resultados correspondientes a la grabación y posterior edición de exper...

La integración del sistema universitario español en el Espacio Europeo de Educación Superior (EEES) supone un gran cambio en el modelo educativo: la docencia se basa en el trabajo y en el aprendizaje del alumnado. Por lo tanto, el rol del profesorado amplía su dedicación a organizar, orientar y supervisar el trabajo del alumnado, mientras disminuye...

The X-ray binary pulsar 4U 1538-52 has been observed by the Rossi X-Ray Timing Explorer (RXTE) satellite. We have analysed the X-ray spectra of the high mass binary X-ray pulsar 4U 1538-52 over the energy range from 3 keV to 100 keV using all the available data from the RXTE archives. In this work, we investigate: a) the description of the continuu...

La integración del sistema universitario español en el Espacio Europeo de Educación Superior (EEES) implica la aceptación de un nuevo modelo educativo basado en el trabajo y en el aprendizaje del alumnado. Por tanto, la importancia de la docencia directa por parte del profesorado se reduce considerablemente ampliando su dedicación a organizar, orie...

Este trabajo ha sido financiado por el Vicerrectorado de Convergencia Europea y Calidad (convocatorio 2003) y por el Vicerrectorado de Tecnología e Innovación Educativa (convocatoria 2004) de la Universidad de Alicante.

La mejora en el aprendizaje de la Física en las asignaturas de Fundamentos Físicos de las titulaciones de Arquitectura, y la obtención de mejores resultados académicos en las mismas pasa por la identificación de las deficiencias conceptuales y procedimentales previas de los estudiantes, y la necesaria adaptación de la docencia con la modificación d...

Resumen En general las titulaciones técnicas tienen como objetivo proporcionar una for-mación adecuada en las bases teóricas y las tecnologías propias de cada pro-fesión. La Física, entendida como materia y herramienta básica del saber cientí-fico y tecnológico, constituye un pilar fundamental de cualquier titulación técni-ca, y en particular en la...

El entorno de trabajo “Matlab” es sin lugar a dudas una herramienta imprescindible para un gran número de científicos e ingenieros que pretenden realizar simulaciones numéricas. Esto se debe a que la programación en “Matlab” se puede realizar de manera relativamente sencilla y eficaz, gracias al gran número de funciones ya implementadas en este ent...

El profesorado de la asignatura de 'Física' ha comprobado que los/as estudiantes sulen tener bastantes dificultades en el seguimiento de la asignatura de primer curso de todas las titulaciones técnicas en las que se imparte la mencionada asignatura. Esto, unido a los cambios recientes en los planes de las titulaciones técnicas, ha hecho que se nece...

La utilización de películas breves de experiencias prácticas de Física tiene un enorme potencial didáctico, ya que los estudiantes pueden visualizar - cuantas veces lo deseen- fenómenos físicos explicados teóricamente en el aula o realizados en las clases de laboratorio. Estas películas no sólo pueden hacer el proceso de aprendizaje más productivo,...

Los resultados que se han obtenido en la investigación realizada por la red se pueden diferenciar atendiendo al plazo en el que se han desarrollado. En este sentido, el proyecto se ha subdividido en subproyectos directamente relacionados con los objetivos que se marcaron en la red. Entre los resultados a corto y medio plazo se pueden destacar los s...

The Doppler effect is a phenomenon which relates the frequency of the harmonic waves generated by a moving source with the frequency measured by an observer moving with a different velocity from that of the source. The classical Doppler effect has usually been taught by using a diagram of moving spheres (surfaces with constant phase) centred at the...

The following article appeared in Am. J. Phys. 71 (1), January 2003, and may be found at http://link.aip.org/link/?AJP/71/46/1 We present three ways of treating the problem of fluid flow in a hollow cylinder. One method involves a differential equation, and the other two involve more physical insight. We discuss the relative advantages of each meth...

In this work a statics virtual laboratory is presented. This virtual laboratory is a set of different applets, tools based in Java, which allow the visualization of different physical laws in the field of statics. The applets have the advantage in that the student can dynamically interact with the computer, giving a useful tool for significance lea...

An important tool for teaching is used at University of Alicante: the virtual campus. We think that information and communication technologies can help us to improve our teaching. Last year, we prepared some materials for our students and checked whether these materials were useful for them. Our experience tells us that students have great difficul...