Four outburst cycles of A0538-66 - Evidence for a rapidly evolving envelope around the primary

Details Four outburst cycles of A0538-66 - Evidence for a rapidly evolving envelope around the primary Four outburst cycles of A0538-66 - Evidence for a rapidly evolving envelope around the primary

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205.1117d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Dec. 1983, p. 1117-1133. Research supported by the

Astronomy and Astrophysics

Astronomy

33

Neutron Stars, Stellar Envelopes, X Ray Sources, Astronomical Photometry, Light Curve, Luminosity, Stellar Mass Accretion, Ultraviolet Radiation

Scientific paper

Continuous multicolor photometry is presented of the 16.6-day recurrent X-ray transient A0538-66, over four consecutive outbursts in late 1981. The magnitudes and colors measured between outbursts are significantly different from previous observations during quiescence, indicating continued activity throughout these cycles. The onset of the outbursts can be as much as about 1.3 days prior to maximum, and during the rises there are complex variations of both V and U-B. The decays are smooth, the longest lasting for about 6 days. Evidence is presented for an extended envelope around the primary which evolves rapidly from cycle to cycle. The neutron star (in a highly eccentric orbit) interacts with this envelope at periastron, and the variability of the rise-times and peaks of the outbursts is governed by the varying size and density of this envelope.

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