Discovery of a compact companion to the hot subdwarf star BD+37 442

2); (2) IUSS Pavia; (3) INAF/OA Cagliari); A. Tiengo (1; N. La Palombara (1); P. Esposito (3) ((1) INAF/IASF Milano; S. Mereghetti (1)

arxiv: 1204.3519 · v1 · pith:EIL634CJnew · submitted 2012-04-16 · 🌌 astro-ph.HE · astro-ph.SR

Discovery of a compact companion to the hot subdwarf star BD+37 442

N. La Palombara (1) , S. Mereghetti (1) , A. Tiengo (1 , 2) , P. Esposito (3) ((1) INAF/IASF Milano , (2) IUSS Pavia , (3) INAF/OA Cagliari) This is my paper

classification 🌌 astro-ph.HE astro-ph.SR

keywords x-raycompaniondetectedemissionstarsubdwarfaccretionaugust

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We report the results of the first X-ray observation of the luminous and helium-rich O-type subdwarf BD+37 442, carried out with the XMM-Newton satellite in August 2011. X-ray emission is detected with a flux of about 3x10^(-14) erg/cm2/s (0.2-1 keV) and a very soft spectrum, well fit by the sum of a blackbody with temperature kT_BB = 45^(+11)_(-9) eV and a power law with a poorly constrained photon index. Significant pulsations with a period of 19.2 s are detected, indicating that the X-ray emission originates in a white dwarf or neutron star companion, most likely powered by accretion from the wind of BD+37 442.

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Discovery of a compact companion to the hot subdwarf star BD+37 442

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