SIMBAD references

2012ApJ...750L..34L - Astrophys. J., 750, L34 (2012/May-2)

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

LA PALOMBARA N., MEREGHETTI S., TIENGO A. and ESPOSITO P.

Abstract (from CDS):

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 2011 August. X-ray emission is detected with a flux of about 3x 10–14 erg/cm2/s (0.2-1 keV) and a very soft spectrum, well fit by the sum of a blackbody with temperature kTBB= 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.

Abstract Copyright:

Journal keyword(s): pulsars: general - stars: individual: BD +37 442 - subdwarfs - X-rays: binaries - X-rays: stars

Simbad objects: 2

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2021.03.08-00:31:41

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