منابع مشابه
A radio pulsar/x-ray binary link.
Radio pulsars with millisecond spin periods are thought to have been spun up by the transfer of matter and angular momentum from a low-mass companion star during an x-ray-emitting phase. The spin periods of the neutron stars in several such low-mass x-ray binary (LMXB) systems have been shown to be in the millisecond regime, but no radio pulsations have been detected. Here we report on detectio...
متن کاملAngular Momentum Transfer in the Binary X - ray Pulsar GX
We describe three presentations relating to the X-ray pulsar GX 1+4 at a workshop on magnetic fields and accretion at the Astrophysical Theory Centre, Australian National University on 1998, November 12-13. Optical and X-ray spectroscopy indicate that GX 1+4 is seen through a cloud of gravitationaly bound matter. We discuss an unstable negative feedback mechanism (originally proposed by Kotani ...
متن کاملX - ray spectrum of the accreting binary X - ray pulsar GX
We present here high resolution X-ray spectrum of the accreting binary X-ray pulsar GX 1+4 obtained with the High Energy Transmission Grating (HETG) instrument of the Chandra X-ray Observatory. This was supplemented by a simultaneous observation with the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer (RXTE). During this observation, the source was in a somewhat low intensit...
متن کاملDiscovery of an X–ray Pulsar in the Low–mass X-ray Binary 2a 1822–371
We report the discovery of 0.59 s X–ray pulsations from the low–mass X–ray binary, 5.57 hr dipping and eclipsing ADC source 2A 1822–371. Pulse arrival time analysis indicates a circular orbit with e <0.03 (95% confidence) and an asini for the neutron star of 1.006(5) lightseconds, implying a mass function of (2.03± 0.03)× 10M⊙. The barycentric pulse period was 0.59325(2) s in 1996.270 and 0.593...
متن کاملThe identification of the transient X - ray pulsar Cepheus X - 4 with a Be / X - ray binary ?
We present long slit spectral (375-725 nm) observations of the proposed identification of the transient 66s Xray pulsar Cep X-4=GS2138+56. Spectra show features typical of Be/X-ray binaries. Superimposed on a weak emission from the IC 1396 nebula, strong Hα (4.5 nm EW) and Hβ (0.3 nm EW) lines are seen in emission with the other Balmer lines in absorption. Significant interstellar absorption fe...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1978
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/184.1.67p