Periodic X-ray outbursts from A0535+26, 2S1145-619 and GX301-2

Details Periodic X-ray outbursts from A0535+26, 2S1145-619 and GX301-2 Periodic X-ray outbursts from A0535+26, 2S1145-619 and GX301-2

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..461w&link_type=abstract

(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie

Astronomy and Astrophysics

Astronomy

14

Binary Stars, Periodic Variations, Pulsars, X Ray Astronomy, Ariel 5 Satellite, B Stars, Early Stars, Emission Spectra, Line Spectra, Main Sequence Stars, Mass Transfer, Neutron Stars, Radiant Flux Density, Stellar Rotation

Scientific paper

Ariel V(SSI) observations of the three X-ray pulsars A0535+26, 2S1145-619 and GX301-2 (2S1223-624) are reported. These sources exhibit X-ray outbursts which appear, on the basis of observations extending over about 5 years, to have recurrence periods of 110 days, 187.5 days and 41.4 days, respectively. If these periods are orbital in origin, the observed X-ray modulation may be explained in terms of an appreciable orbital eccentricity giving rise to time-variable accretion. (In the case of GX301-2, published pulse timing data already provide independent evidence for a 41.4-day orbital period and an eccentricity of 0.4.) The optical counterparts are all early-type stars; A0535+26 and 2S1145-619 are identified with Be main sequence stars and GX301-2 with a B2 supergiant which also shows an emission line spectrum. The implications of the observations in relation to possible mass transfer mechanisms in such systems are discussed.

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