Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..806k&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 806-813.
Astronomy and Astrophysics
Astrophysics
51
B Stars, Binary Stars, Pulsars, Stellar Mass Accretion, X Ray Sources, Accretion Disks, Cassiopeia Constellation, Companion Stars, H Alpha Line, Light Emission, Neutron Stars, Stellar Spectrophotometry
Scientific paper
Optical observations of the proposed Be companion star (V635 Cas) to the hard transient X-ray pulsar 4U 0115+63 are presented and are used to predict the December 1980 X-ray outburst. It is found that V635 Cas increased in brightness by 1.7 magnitudes over the three months preceeding the X-ray outburst, and strong, variable H-alpha emission was always present. These results are shown to demonstrate that increased optical activity in the Be companion star can lead directly to a hard transient X-ray outburst. A delay of approximately 60 days is found between the onset of optical activity and the X-ray outburst. Direct accretion from a stellar wind can be ruled out due to this delay and the absence of orbital modulation of the 1980 X-ray outburst. It is suggested that the delay represents the time for material near the X-ray source to form an accretion disk and move inward toward the neutron star surface.
Cominsky Lynn R.
Kriss Gerard Anthony
Remillard Ron A.
Thorstensen John R.
Williams George G.
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