Volume 369, Number 1, April I 2001
|Page(s)||108 - 116|
|Section||Interstellar and circumstellar matter|
|Published online||15 April 2001|
The Be/X-ray transient 4U 0115+63/V635 Cassiopeiae
I. A consistent model
SAX SDC, ASI, c/o Nuova Telespazio, via Corcolle 19, 00131 Rome, Italy
2 Astrophysics Research Institute, Liverpool John Moores University, Byrom St., Liverpool L3 3AF, UK
3 Faculty of Engineering, Hokkai-Gakuen University, Toyohira-ku, Sapporo 062-8605, Japan
Corresponding author: I. Negueruela, firstname.lastname@example.org
Accepted: 10 January 2001
We present photometry and high SNR spectroscopy in the classification region of V635 Cas, 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 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.
Key words: stars: circumstellar matter / stars: emission-line, Be / stars: individual: 4U 0115+63, / binaries: close / stars: neutron / X-ray: stars
© ESO, 2001
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