Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..371w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 371-375. Research sponsored by DOE.
Astronomy and Astrophysics
Astrophysics
14
Gamma Ray Bursts, Pulsars, X Ray Binaries, Pulse Duration, Vela Satellites, X Rays
Scientific paper
The known X-ray transient pulsar V0332+53 underwent a major outburst June-September 1973. The event reached a maximum average intensity in the 3-12-keV energy band of 1.6 times that of the Crab and exhibited variations up to 2.5 times that standard value on time scales of minutes. The 4.37-sec pulse period was seen during this outburst and implies a secular spin-period change of less than 4 x 10 to the -13th/sec between this event and the next detection of the pulse period in 1983 by Exosat. The 100-day outburst exhibits a modulation at the 34-day orbital period. As a result, an improved orbital period of either 34.38 + or - 0.02 or 34.07 + or - 0.02 days can be suggested for this source. Furthermore, this type of modulation implies that accretion from an evolving circumstellar envelope of the Be-star companion can account for the behavior of this transient.
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