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X-ray emission from hot subdwarfs with compact companions
Sandro Mereghetti, Nicola La Palombara, Paolo Esposito +1
We review the X-ray observations of hot subdwarf stars. While no X-ray emission has been detected yet from binaries containing B-type subdwarfs, interesting results have been obtai…
The XMM-Newton survey of the Small Magellanic Cloud
F. Haberl, R. Sturm, J. Ballet +13
Although numerous archival XMM-Newton observations existed towards the Small Magellanic Cloud (SMC) before 2009, only a fraction of the whole galaxy was covered. Between May 2009 a…
Discovery of a compact companion to the hot subdwarf star BD+37 442
N. La Palombara, S. Mereghetti, A. Tiengo +1
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 emis…