Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284..859n&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 4, pp. 859-868.
Astronomy and Astrophysics
Astronomy
16
Binaries: General, Stars: Emission-Line, Be, Stars: Individual: V635 Cas, Pulsars: General, Infrared: Stars, X-Rays: Stars
Scientific paper
We present OSSE observations of the recurrent X-ray transient 4U0115+63 during the 1994 May-June outburst, spanning the brightest period of the outburst and covering more than a full binary orbit. We also present long-term observations of the optical counterpart V635 Cassiopeiae and the long-term hard X-ray light curve determined by BATSE pulsed observations. Optical and infrared photometry as well as Hα spectroscopy reveals that the correlation between the optical and X-ray behaviour of the source, although evident, is not simple. We discuss the recent history of the system, paying particular attention to the extremely unusual behaviour of the Be star. We investigate the possible mechanisms for this behaviour and find that the centrifugal inhibition of accretion theory provides an adequate explanation for the X-ray activity. Our data, however, point strongly against the previous assumption that the accretion disc around the neutron star is responsible for the very large variations in optical luminosity. These variations, as well as those in the shape and strength of the Hα line, must originate in the Be circumstellar envelope.
Coe Malcolm J.
Fabregat Juan
Finger Mark H.
Grove Eric J.
Negueruela Ignacio
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