An optical outburst from the periodic recurrent X-ray transient A0538-66 |
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| Authors: | P A Charles L Booth R H Densham J R Thorstensen A J Willis |
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| Institution: | (1) Department of Astrophysics, University of Oxford, UK;(2) Department of Physics and Astronomy, Dartmouth College, UK;(3) Department of Physics and Astronomy, University College, London |
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| Abstract: | We present optical spectroscopy and photometry and IUE spectroscopy 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 HeI emission (indicative of a shell phase) superposed on a B2 IV spectrum with a substantial brightness increase of 2m and the sharp turn-on of HeII  686 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 ( 5000 km s–1) emission from C IV 1550 and HeII 1640. This behaviour is compared with other galactic transients and shell/Be stars. |
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