Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915107i&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #151.07; Bulletin of the American Astronomical Society,
Other
Scientific paper
The Be/X-ray binary 4U 1145-619/V* V801 Cen/HD102567 has been observed with the Far Ultraviolet Spectroscopic Explorer(FUSE) to probe the effect of X-ray photoionization. This system is composed of a Be star and neutron star (X-ray pulsar) in a wide orbital period of 186 days. The system contains two quasi-Keplerian (ratio of radial to orbital velocity components less than 0.01) disks: a decretion disk around the Be star and an accretion disk around the neutron star. Both disks are temporary: the decretion disk disperses and refills on time scales of years (dynamical evolution of the disk), while the accretion disk disperses and refills on time scales of weeks to months (which is related to the orbital motion in an eccentric orbit and, on some occasions, also to the major instabilities of the other disk). The accretion disk might be absent over a longer period of time (years), if the other disk is very weak or absent. The X-ray emission of Be/X-ray binaries has a distinctly transient nature and is influenced by the periastron passages and by the dynamical evolution of the decretion disk. The pulsar 4U 1145-619 with a 292-s period ionizes its surroundings as it moves through the binary orbit, producing X-rays while accreting some of the ambient stellar wind from B1Vne star with a mass of 13 Solar Masses. Spectral changes with orbital phase were detected at the two observed phases. We report on the initial results. Additional observations are planned.
Iping Rosina
Sonneborn George
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