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A possible nonthermal X-ray emission from γ Cas analogues stars

Ryspaeva, Elizaveta B.; Kholtygin, Alexander F.

We analyze the archival XMM-Newton X-ray observations of 15 γ Cas analogue stars and two candidates for such objects. The EPIC spectra of the considered stars in the range of 0.2-8 keV were extracted and fitted by different models. Our estimates show that assuming the X-ray emission from γ Cas analogues to be totally thermal, their model plasma te…

News on the X-ray emission from hot subdwarf stars

Mereghetti, Sandro; Palombara, Nicola La

In latest years, the high sensitivity of the instruments on-board the XMM-Newton and Chandra satellites allowed us to explore the properties of the X-ray emission from hot subdwarf stars. The small but growing sample of X-ray detected hot subdwarfs includes binary systems, in which the X-ray emission is due to wind accretion onto a compact compani…