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XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J0440.9+4431
N. La Palombara, L. Sidoli, P. Esposito +2
Many X-ray accreting pulsars have a soft excess below 10 keV. This feature has been detected also in faint sources and at low luminosity levels, suggesting that it is an ubiquitous…
A new super-soft X-ray source in the Small Magellanic Cloud: Discovery of the first Be/white dwarf system in the SMC?
R. Sturm, F. Haberl, W. Pietsch +5
The Small Magellanic Cloud (SMC) hosts a large number of Be/X-ray binaries, however no Be/white dwarf system is known so far, although population synthesis calculations predict tha…
Search for X-ray emission from subdwarf B stars with compact companion candidates
Sandro Mereghetti, Sergio Campana, Paolo Esposito +2
Stellar evolutionary models predict that most of the early type subdwarf stars in close binary systems have white dwarf companions. More massive companions, such as neutron stars o…
The progenitor of a type Ia supernova with a short delay time?
S. Mereghetti, N. La Palombara, A. Tiengo +3
HD49798/RXJ0648.0-4418 is the only known X-ray binary composed of a hot subdwarf and a massive white dwarf (M=1.28+/-0.05 Msun). This system, with an orbital period of 1.55 days, i…
Highly absorbed X-ray binaries in the Small Magellanic Cloud
G. Novara, N. La Palombara, S. Mereghetti +12
Many of the high mass X-ray binaries (HMXRBs) discovered in recent years in our Galaxy are characterized by a high absorption, most likely intrinsic to the system, which hampers th…
X-ray and optical observations of the unique binary system HD49798/RXJ0648.0-4418
S. Mereghetti, N. La Palombara, A. Tiengo +5
We report the results of XMM-Newton observations of HD49798/RXJ0648.0-4418, the only known X-ray binary consisting of a hot sub-dwarf and a white dwarf. The white dwarf rotates ver…