WATCH observations of the X-ray pulsar 301-2

Details WATCH observations of the X-ray pulsar 301-2 WATCH observations of the X-ray pulsar 301-2

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..329c&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 329-331.

Astronomy and Astrophysics

Astronomy

1

B Stars, Pulsars, Supergiant Stars, X Ray Astronomy, X Ray Binaries, Light Curve, Sky Surveys (Astronomy), Stellar Mass Accretion, Stellar Winds

Scientific paper

The wind-fed X-ray pulsar GX 301-2 has been observed by the all-sky X-ray monitor WATCH during the period January 1990-January 1992. During the periastron passage of October 1991 an extremely bright outburst was observed which for a time made the pulsar the brightest source in the hard X-ray sky. The pulse period was determined as P = 678.05 +/- 0.45 s which extends the long spin-up episode observed since 1984. The GX 301-2 system is known to exhibit a recurrent outburst preceding periastron at phase 0.95. We have also identified another recurrent activity period near orbital phase 0.78. Flaring near this phase was seen previously in an observation by HEAO-1 in 1978.

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