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I am a Ph.D. candidate in astrophysics and a research assistant at Masaryk University, currently working on a Ph.D. Thesis project aimed at pseudo-rotational model atmospheres of the rotating B- and A-type stars.
We present new progress in our extensive project mCPod (On-line database of photometric observations of magnetic CP stars), which was initiated five and a half years ago (Mikulásek et. al, 2007). The nascent database that contains now more than 215 thousand photometric measurements of the most important 157 mCP stars will be continuously supplement...
Magnetic chemically peculiar (mCP) stars of the upper part of the main sequence usually exhibit strictly periodic variations of their light, spectrum and magnetic field. These changes can be well explained using the oblique rotator model of the rigidly rotating star with persistent photometric spots, uneven horizontal abundance of chemical elements...
V Sge is a luminous supersoft X-ray source that has been receiving outstanding attention from various researchers since 1965. However, the mechanism of the most remarkable light changes called large outbursts still remains unexplained. Thanks to new CCD equipment at the Hlohovec Observatory we were able to do the first steps in order to discover th...
CCD photometry of QR And obtained in 2004 is reported. The lightcurves show changes in overall brightness on timescale of a week in range of ~0.30 mag, contrary to recently published results ~0.15 mag. With our data set we improved the orbital period and construct the first (O-C) diagrams.
New quadratic orbital elements of V Sge are presented. These was computed using 14 minima timings obtained in 2004. During this photometric campaing, the star was undergoing large outburst, which was measured in detail using CCD.
The paper is devoted to the description of methodology for variability determination of point light source, as well as to data reduction and anlysis of data to obtain basic physical chracteristics of discovered variable stars. We characterize basic photometric behavior of new variables discovered by our group in the fileds of BX Pegasi and V Sagitt...
According to the von Zeipel theorem, for rotating stars, the effective temperature (Teff) and surface gravity (log g), is significantly different at the equator and poles (Maeder, 1999, A&A, 347, 185). Slettebak et al. (1980, ApJ, 242, 171) published such values for a wide variety of spectral types. A complete grid of stellar atmospheres is already existing and can be used for the thesis. The task is to take the published Teff, logg and rotational velocity values, select the corresponding stellar atmosphere and sum up all models over the stellar disk. Finally, "pseudo rotating" synthesized stellar atmospheres are derived. Those models will be used form several different applications. For example, a new classification scheme, test for isochrones taking into account rotation, synthesized photometric grids, an inversion technique to estimate the most proper inclination, and so on. Furthermore, these models can be used by the community for asteroseismology, population synthesis, isochrones, and integrated colors of star clusters.