Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..675s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 675-681.
Astronomy and Astrophysics
Astrophysics
22
Accretion Disks, B Stars, Pulsars, Solar Maximum Mission, X Ray Binaries, Pulsar Magnetospheres, Stellar Magnetic Fields, Stellar Rotation, Stellar Spectra
Scientific paper
An examination of archival data from the hard X-ray instruments on the Solar Maximum Mission (SMM) satellite has revealed a previously undetected outburst from the recurrent X-ray transient, A0535 + 26. The outburst occurred in June 1983 and reached a peak intensity of about 2 crab units in the energy range 32-91 keV. The outburst was detected over a span of 18 days, and the pulse period was observed to spin-up with an average rate of about -6 x 10 to the -8th s/s. A recently proposed model for A0535 + 26 has a pulsar powered by a short-lived accretion disk. A thin accretion disk model is fitted to the present data, assuming an orbital period of 111 days. Two solutions to the magnetic moment of the neutron star are derived. The slow rotator solution is more consistent with the model than the fast rotator, on the grounds that the conditions for the formation of an accretion disk are more favorable for a lower magnetic field strength.
Davies Steven R.
Dennis Brian R.
Orwig Larry E.
Schwartz Richard A.
Sembay Steve
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