Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-09-16
Astronomy and Astrophysics
Astrophysics
To be published in the Astrophysical Journal, 1999, volume 511. 9 figures
Scientific paper
10.1086/306727
Rossi X-ray Timing Explorer (RXTE) All-Sky Monitor (ASM) observations of the X-ray binary 2S0114+650 show modulations at periods close to both the optically derived orbital period (11.591 days) and proposed pulse period (~ 2.7 hr). The pulse period shows frequency and intensity variability during the more than 2 years of ASM observations analyzed. The pulse properties are consistent with this arising from accretion onto a rotating neutron star and this would be the slowest such period known. The shape of the orbital light curve shows modulation over the course of the entire orbit and a comparison is made with the orbital light curve of Vela X-1. However, the expected phase of eclipse, based on an extrapolation of the optical ephemeris, does not correspond with the observed orbital minimum. The orbital period derived from the ASM light curve is also slightly longer than the optical period.
Corbet Robin H. D.
Finley John P.
Peele Andrew G.
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