X-ray binary A0538-66 during the years 1897 through 1951

Details X-ray binary A0538-66 during the years 1897 through 1951 X-ray binary A0538-66 during the years 1897 through 1951

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5417b&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #54.17; Bulletin of the American Astronomical Society, Vol. 34, p.1201

Astronomy and Astrophysics

Astronomy

Scientific paper

Eye estimates of the photographic magnitudes of the X-ray binary A0538-66 were done to an accuracy of +/- 0.5 magnitude on 91 plates from the Harvard College Observatory collection covering the period from 1897 to 1951. The archival data confirms the presence of the 16.651-day periodicity first discovered in X-ray observations and subsequently seen in the visible. Ten outbursts of about a magnitude or more were found in the archival data, all occurring within 3.3 days of ephemeris maxima of the 16.651-day cycle. However, the majority of the plates close to ephemeris maxima do not show significant brightening of the star, indicating that the on-off behavior seen in recent years also operated during the years of the archival data. We are investigating a possible correlation of the outbursts with the 420.8-day visible periodicity of the system recently discovered in the MACHO data. This project was supported by the NSF/REU grant AST-0097694 and the Nantucket Maria Mitchell Association.

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