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Swift X-ray and ultraviolet observations of the shortest orbital period double-degenerate system RX J0806.3+1527 (HM Cnc)
P. Esposito, G. L. Israel, S. Dall'Osso +1
The system RX J0806.3+1527 (HM Cnc) is a pulsating X-ray source with 100 per cent modulation on a period of 321.5 s (5.4 min). This period reflects the orbital motion of a close bi…
X-ray and -ray Studies of the Millisecond Pulsar and Possible X-ray Binary/Radio Pulsar Transition Object PSR J1723-2837
Slavko Bogdanov, Paolo Esposito, Fronefield Crawford +3
We present X-ray observations of the "redback" eclipsing radio millisecond pulsar and candidate radio pulsar/X-ray binary transition object PSR J1723-2837. The X-ray emission from…
A variable absorption feature in the X-ray spectrum of a magnetar
Andrea Tiengo, Paolo Esposito, Sandro Mereghetti +9
Soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are slowly rotating, isolated neutron stars that sporadically undergo episodes of long-term flux enhancement (out…
The variable X-ray emission of PSR B0943+10
Sandro Mereghetti, Andrea Tiengo, Paolo Esposito +1
The old pulsar PSR B0943+10 (P=1.1 s, characteristic age tau=5 Myr) is the best example of mode-switching radio pulsar. Its radio emission alternates between a highly organized sta…
Observations of the unique X-ray emitting subdwarf stars HD49798 and BD+37 442
N. La Palombara, S. Mereghetti, A. Tiengo +3
We report on the results we obtained with XMM-Newton observations of HD49798 and BD+37 442, the only two sdO stars for which X-ray emission has been observed so far. HD is a single…
Swift/XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255
L. Ducci, P. Romano, P. Esposito +5
We report on the Swift/X-ray Telescope (XRT) monitoring of the field of view around the candidate supergiant fast X-ray transient (SFXT) IGR J17354-3255, which is positionally asso…