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Temperature Profiles of Accretion Disks around Rapidly Rotating Neutron Stars in General Relativity and the Implications for Cygnus X-2

Misra, Ranjeev; Bhattacharyya, Sudip; Thampan, Arun V. +1 more

We calculate the temperature profiles of (thin) accretion disks around rapidly rotating neutron stars (with low surface magnetic fields), taking into account the full effects of general relativity. We then consider a model for the spectrum of the X-ray emission from the disk that is parameterized by the mass accretion rate, the color temperature, …

X1908+075: An X-Ray Binary with a 4.4 Day Period

Remillard, Ronald A.; Wen, Linqing; Bradt, Hale V.

X1908+075 is an optically unidentified and highly absorbed X-ray source that appeared in early surveys such as Uhuru, OSO 7, Ariel 5, HEAO-1, and the EXOSAT Galactic Plane Survey. These surveys measured a source intensity in the range 2-12 mcrab at 2-10 keV, and the position was localized to ~0.5d. We use the Rossi X-Ray Timing Explorer (RXTE) All…

LMC X-2: The First Extragalactic Z Source?

Kuulkers, Erik; Smale, Alan P.

We present RXTE observations of LMC X-2 obtained during a 5 day interval in 1997 December, during which the source was radiating at a mean intensity near the Eddington limit and was strongly variable on timescales of seconds to hours. The shapes of the X-ray color-color and hardness-intensity diagrams during the observations, the presence of very …