IUE observations of the X-ray binary A0538-66 - Spectroscopic study of a strange stellar system

Details IUE observations of the X-ray binary A0538-66 - Spectroscopic study of a strange stellar system IUE observations of the X-ray binary A0538-66 - Spectroscopic study of a strange stellar system

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..287h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 15, 1984, p. 287-308.

Astronomy and Astrophysics

Astronomy

17

Binary Stars, Spaceborne Astronomy, Stellar Spectrophotometry, Stellar Systems, Ultraviolet Astronomy, X Ray Sources, Astrometry, Infrared Photometry, Infrared Spectra, Iue, Orbital Elements, Spectral Energy Distribution, Stellar Luminosity, Stellar Mass Accretion, Stellar Temperature, Stellar Winds

Scientific paper

The results of extensive IUE monitoring of the optical counterpart of the recurrent periodic LMC X-ray transient A0538-66 are presented. Even when the system is not in outburst dramatic spectral variations occur, accompanied by changes in the temperature and surface area of the continuum emitting region. It is shown that, in spite of these variations, the out-of-outburst data are consistent with constant bolometric luminosity. The optical outbursts can be powered solely by reprocessed X-rays. The long-term and orbital behavior of the system is discussed in the light of these results. From an analysis of apparently undisturbed P Cygni profiles, the mass-loss rate of the primary via its stellar wind is determined to be about 4 x 10 to the -9th solar masses/yr. Infrared photometry reveals an excess at H and K which is too large to be explained by free-free emission from this wind alone.

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