An optical outburst from the periodic recurrent X-ray transient A0538-66

Details An optical outburst from the periodic recurrent X-ray transient A0538-66 An optical outburst from the periodic recurrent X-ray transient A0538-66

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..423c&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

10

Early Stars, Light (Visible Radiation), Periodic Variations, Stellar Spectra, Stellar Spectrophotometry, X Ray Sources, Balmer Series, Emission Spectra, Helium Ions, Iue, Radial Velocity, Radiant Flux Density, Stellar Envelopes, Stellar Flares, Stellar Mass Ejection

Scientific paper

Optical spectroscopy and photometry and IUE spectroscopy are presented of the counterpart of the LMC recurrent X-ray transient A0538-66 during an outburst at the end of December 1980 which was consistent with the 16.6-day X-ray period (Skinner, 1980). The optical spectra show steadily increasing Balmer and He I emissions, indicative of a shell phase, superposed on a B2 IV spectrum with a substantial brightness increase of 2 magnitudes and the sharp turn-on of He II 4686 A at the peak. Significant radial velocity changes have been detected, but they show no correlation with the 16.6-day period. IUE spectra during a subsequent outburst show very strong and broad (about 5000 km/sec) emission from C IV 1550 A and He II 1640 A. This behavior is compared with other galactic transients and shell/Be stars.

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