Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4301c&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #43.01; Bulletin of the American Astronomical Society, Vol. 30, p.1313
Astronomy and Astrophysics
Astronomy
Scientific paper
A new X-ray source, XTE J1855-026, was discovered during RXTE scans along the galactic plane. The source shows pulsations at a period of 361 s and also modulation at a period of 6.1 days which we interpret as the orbital period of the system. The X-ray spectrum above ~ 3 keV can be fitted with an absorbed power law model with a high-energy cut-off or cyclotron absorption line, and an iron emission line at approximately 6.4 keV. We interpret these results as indicating that XTE J1855-026 is likely to consist of a neutron star accreting from the wind of an early spectral type supergiant primary. If the source is instead a Be/neutron star system, perhaps associated with a 12th magnitude Be star inside the X-ray error box, then it would have the shortest known orbital period for such a system.
Corbet Robin H. D.
Marshall Francis E.
Peele Andrew G.
Takeshima Toshi
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