Physics – High Energy Physics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1206..462s&link_type=abstract
ASTROPHYSICS AND COSMOLOGY AFTER GAMOW: Proceedings of the 4th Gamow International Conference on Astrophysics and Cosmology Afte
Physics
High Energy Physics
X-Ray Sources (Astronomical), Brightness, White Dwarfs, Stars, X-Ray Spectra, X-Ray Sources, X-Ray Bursts, Magnitudes And Colors, Luminosities, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Main-Sequence: Late-Type Stars, Spectroscopy And Spectrophotometry
Scientific paper
In this study, a spectral analysis of the dwarf nova WX Hyi (which is a Cataclysmic Variables (CV)) is presented. The system was observed during the normal ourburst with the XMM-Newton observatory. X-ray bolometric flux value (EX<=12 keV) is estimated to be ~2.98×10-12 erg cm-2 s-1 and X-ray luminosity LX = 5×1031 erg/s. Elemental abundance was founded 3 factor of solar abundances. If the gas temperature is higher than 107 K, it is optically thin. Therefore, they are radiated as thermal bremsstrahlung X-ray emission. PN+MOS detector measurements indicate that X-ray emitting maximum plasma temperature is kTMax = 31.3 keV (3.6322×108 K). Hence, the X-ray spectrum analysis during the normal outburst of WX Hyi is indicated a hot and optically thin plasma in the boundary layer that cools via an isobaric cooling flow while settling onto the white dwarf. For this temperature, the mass accretion rate is estimated to be MBL = 4×1014 gr/s (6.3×10-12 Msolar/yr). The ratio of the Boundary Layer (BL) (X-ray) luminosity to the disc luminosity was estimated to be LBL/Ldisc~0.3. We calculated the mass accretion ratio of BL to the accretion disc (ṀBL/Ṁdisc) to be ~0.74 and ~0.27 during the rise to the outburst and outburst, respectively. A great quantity of the accreting gas from the rise to the outburst is lost in a wind. Fe XXV line at 6.7 keV is originated from a plasma having temperature of 107-108 K. The obtained temperature value from this study is compatible with this plasma structure.
Gün Gülnur I. K. I. S.
Limboz Füsun
Sen Mukadder I. G. D. I.
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