Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-22
Astron.Astrophys. 369 (2001) 108
Astronomy and Astrophysics
Astrophysics
10 pages, 6 figures, uses aa.cls. To appear in Astronomy and Astrophysics Main Journal
Scientific paper
10.1051/0004-6361:20010146
We present photometry and high SNR spectroscopy in the classification region of V635 Cas, the optical counterpart to the transient X-ray pulsator 4U 0115+63, taken at a time when the circumstellar envelope had disappeared. V635 Cas is classified as a B0.2Ve star at a distance of 7-8 kpc. We use the physical parameters derived from these observations and the orbit derived from X-ray observations to elaborate a model of the system based on the theory of decretion discs around Be stars. We show that the disc surrounding the Be star must be truncated by the tidal/resonant interaction with the neutron star and cannot be in a steady state. This explains many of the observed properties of 4U 0115+63. In particular, because of this effect, under normal circumstances, the neutron star cannot accrete from the disc, which explains the lack of regular Type I outbursts from the source.
Negueruela Ignacio
Okazaki Atsuo T.
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