期刊
ASTRONOMY & ASTROPHYSICS
卷 369, 期 1, 页码 108-116出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20010146
关键词
stars : circumstellar matter; stars : emission-line, Be; stars : individual : 4U 0115+63; binaries : close; stars : neutron; X-ray : stars
We present photometry and high SNR spectroscopy in the classification region of V635 Gas, the optical counterpart to the transient X-ray pulsar 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 is 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.
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