Nikolaos Nanouris

Nikolaos Nanouris
National Observatory of Athens | NOA · Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS)

Ph.D.

About

19
Publications
513
Reads
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46
Citations
Citations since 2016
3 Research Items
42 Citations
20162017201820192020202120220246810
20162017201820192020202120220246810
20162017201820192020202120220246810
20162017201820192020202120220246810
Additional affiliations
December 2006 - June 2011
National and Kapodistrian University of Athens
Position
  • PhD Student

Publications

Publications (19)
Article
We present new optical broad-band (UBVRI) aperture polarimetric observations of 53 post-asymptotic giant branch (AGB) stars selected to exhibit a large near-infrared excess. 24 out of the 53 stars (45% of our sample) are presented for the first time. A statistical analysis shows four distinctive groups of polarized post-AGB stars: unpolarized or ve...
Poster
Full-text available
We present the first CCD images of the VRO 42.05.01 (G 166.0+4.3) supernova remnant in Hα+[N II], [O III] 5007 and [S II] at a moderate angular resolution. Low and high-dispersion spectroscopy was also performed at selected areas around this extended remnant. Diagnostic diagrams of the line intensities from the present spectra and the new kinematic...
Article
HFG1 is the first well observed planetary nebula (PN) which reveals a cometary-like structure. Its main morphological features consist of a bow shaped shell, which surrounds the central star, accompanied by a long collimated tail. In this study we perform two-dimensional hydrodynamic simulations modeling the formation of HFG1 from the interaction o...
Article
Full-text available
The Manchester-Athens Wide-Field (Narrow-Band) Camera (MAWFC) is the first scientific instrument for astronomy that constructed and tested completely in Greece. The instrument is ready and after the first light tests, it started to conduct a large-area sky survey that will provide maps at 1 arcmin resolution, in order to investigate the very extens...
Article
The Galactic planetary nebula HFG1 reveals an intriguing morphology consisting of a bow shaped shell which surrounds the central star followed by a collimated tail. This unique cometary-like morphology of HFG1 has been attributed to the systemic motion of the planetary nebula (PN) with respect to the local ambient medium. In this work we model HFG1...
Article
In the present work, we evaluate the efficiency of the wind-driven mass loss during the main sequence phase of rapid rotating, late spectral type binary stars by monitoring their eclipse timing variations (ETV). In this group of particular interest, strong magnetic fields and tidal forces can potentially elevate the stellar wind mass loss rates and...
Article
Full-text available
The Manchester-Athens Wide-Field Camera (MAWFC) is a joint project between the National Observatory of Athens and the Jodrell Bank Centre for Astrophysics of the Manchester University which aims to conduct a large-area sky survey with the aid of a customized camera and narrow-band filters properly designed for studying extended interstellar medium...
Poster
Full-text available
Following the discovery of a long trail behind the planetary nebula HFG1 (Boumis et al. 2009), we performed single- and multi-slits high-resolution echelle spectroscopy covering both the bow-shock and the long tail of this PN. Furthermore, we performed 2-D hydrodynamical simulations of the cometary structure of this PN. Both the kinematic and model...
Article
Full-text available
Context. The credibility of an eclipse timing variation (ETV) diagram analysis is investigated for various manifestations of the mass transfer and gravitational radiation processes in binary systems. The monotonicity of the period variations and the morphology of the respective ETV diagrams are thoroughly explored in both the direct impact and the...
Article
Full-text available
Reports on the variability of NOMAD1 1609-0153378 and NOMAD1 1609-0153459.
Article
Full-text available
We present 105 times of minima of 33 eclipsing binaries.
Article
Full-text available
The pure information directly taken from the observed orbital evolution of eclipsing binary stars (centuries at most) is valuable for the study of many important physical mechanisms related to the stellar structure. Especially in the case of eclipsing binary systems, this may happen by monitoring their eclipse timing variations, i.e. by means of an...
Article
Full-text available
Context. The credibility of an O-C diagram analysis is investigated when long-term processes are examined in binary systems. The morphology of period and O-C diagrams is thoroughly explored when mass loss and magnetic braking, induced by stellar winds, drive the orbital evolution of late-type detached binaries. Conditions are specified that determi...
Article
Full-text available
The poster deals with the possible variability of GSC 02696-02622. GSC 02696-02622 is located in the vicinity of the eclipsing binary CG Cyg and thus the former has been chosen several times as a comparison star of the latter. Therefore, variability in the brightness of GSC 02696-02622 could lead to incorrect conclusions of the CG Cyg behavior, a f...
Article
Full-text available
We present BVRI observations of two not previously studied eclipsing binary stars. A significant number of times of minima were determined and therefore new more accurate ephemerides were produced. Neither photometric elements nor spectral types for these two variable stars were known, thus a first approximation of their effective temperature and a...
Article
Full-text available
Detached binary systems are subjected to a variety of physical mechanisms which are able to change their period in a continuous way and in a broad band of timescales. Assuming that these changes should be detectable in O–C diagrams in a way specified by the physical theory of the underlying mechanisms, we carry out a preliminary study in a properly...
Article
Full-text available
It is the first time complete light curves have been acquired and a more thorough analysis has taken place for EA-type binaries FO Aur and V1025 Her. Our data set consists of four-color imaging (BVRI) obtained at NOA (Kryoneri, 1.2m telescope). The deduced light curves were acquired using GAIA Starlink software.
Article
Full-text available
We present preliminary results of BVRI photometry of binary stars out of an observing list of short period binaries without any previous multifilter observations. The purpose of this project is to obtain photometric elements and the absolute parameters for further understanding of the evolutionary processes for these systems. The observations took...
Article
Full-text available
We present preliminary results of BVRI photometry of binary stars out of an observing list of short period binaries without any previous multifilter observations. The purpose of this project is to obtain photometric elements and the absolute parameters for further understanding of the evolutionary processes for these systems. The observations took...

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