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Observations of the unique X-ray emitting subdwarf stars HD49798 and BD+37 442

We report on the results we obtained with XMM-Newton observations of HD49798 and BD+37 442, the only two sdO stars for which X-ray emission has been observed so far. HD is a single-lined spectroscopic binary with orbital period of 1.5 days. We could establish that its companion is a massive white dwarf with M = 1.28 Msun, which makes it a candidate type Ia supernova progenitor; we also detected a significant X-ray emission during the white-dwarf eclipse, which could be X-ray emission of the sdO star itself. In the case of BD+37 442, a luminous He-rich sdO that up to now was believed to be a single star, we discovered soft X-ray emission with a periodicity of 19.2 s. This indicates that also this hot subdwarf has a compact binary companion, either a white dwarf or a neutron star, most likely powered by accretion from the wind of the sdO star.

preprint2013arXivOpen access
N. La PalombaraS. MereghettiA. TiengoP. EspositoL. StellaG. L. Israel
astro-ph.HEastro-ph.SR
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N. La PalombaraS. MereghettiA. TiengoP. EspositoL. StellaG. L. Israel

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