Low level optical and X-ray activity in A0538-66

Details Low level optical and X-ray activity in A0538-66 Low level optical and X-ray activity in A0538-66

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.4807c&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #48.07; Bulletin of the American Astronomical Society, Vol. 27, p.880

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We present ASCA observations made in February 1995 around the time of a predicted outburst from the 16.65 day period recurrent transient A0538-66 together with simultaneous optical photometry. Optical spectroscopy was also obtained near a predicted outburst approximately two months earlier. We find that A0538-66 is active, both in X-rays and optically, although at a much lower level than during the largest super-Eddington outbursts that have been seen in the past. The optical spectra show variable Balmer emission but not the strong HeII 4686 Angstroms emission that accompanies large outbursts. We consider X-ray production processes that may produce the observed behavior. In particular accretion onto the magnetosphere rather than the surface of a neutron star is discussed.

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