DISCOVERY OF A COMPACT COMPANION TO THE HOT SUBDWARF STAR BD +37° 442

We report the results of the first X-ray observation of the luminous and helium-rich O-type subdwarf BD +37[degrees] 442 carried out with the XMM-Newton satellite in 2011 August. X-ray emission is detected with a flux of about 3x 10 super(-14) erg cm super(-2) s super(-1) (0.2-1 keV) and a very soft...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2012-05, Vol.750 (2), p.1-5
Main Authors: PALOMBARA, NICOLA LA, Mereghetti, Sandro, TIENGO, ANDREA, Esposito, Paolo
Format: Article
Language:English
Subjects:
Emission
Flux
Photons
Pulsation
Texts
White dwarf stars
X-rays
XMM (spacecraft)
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Summary:We report the results of the first X-ray observation of the luminous and helium-rich O-type subdwarf BD +37[degrees] 442 carried out with the XMM-Newton satellite in 2011 August. X-ray emission is detected with a flux of about 3x 10 super(-14) erg cm super(-2) s super(-1) (0.2-1 keV) and a very soft spectrum, well fit by the sum of a blackbody with temperature kT sub(BB) = (ProQuest: Formulae and/or non-USASCII text omitted) 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[degrees] 442.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/750/2/L34