Two years of observations of the X-ray pulsar VELA X-1 with the Watch instrument of the GRANAT observatory

Details Two years of observations of the X-ray pulsar VELA X-1 with the Watch instrument of the GRANAT observatory Two years of observations of the X-ray pulsar VELA X-1 with the Watch instrument of the GRANAT observatory

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18...16l&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 16; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 1, Jan. 1992, p. 37-4

Astronomy and Astrophysics

Astronomy

5

Light Curve, Pulsars, Stellar Rotation, X Ray Stars, Accretion Disks, Angular Velocity, Stellar Flares, Stellar Winds, X Ray Sources

Scientific paper

Observations of the Vela X-1 X-ray pulsar made with the Watch instrument on board the Granat observatory from January 1990 to September 1991 are reported. The 283.3-s rotation period of the pulsar was found to be maximal for the entire history of the observations. The light curve of the source demonstrates the presence of strong X-ray flares with a duration of several hours. On January 9-10, 1991 Watch detected the source's switch-off, which lasted more than 10 h. This switch-off began two days prior to the regular eclipse.

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