Improved position and new optical candidate for A0538-66

Details Improved position and new optical candidate for A0538-66 Improved position and new optical candidate for A0538-66

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285...26j&link_type=abstract

Nature, vol. 285, May 1, 1980, p. 26, 27.

Astronomy and Astrophysics

Astronomy

38

Astrometry, Position (Location), X Ray Sources, Data Processing, Heao 1, Magellanic Clouds, Stellar Spectrophotometry

Scientific paper

An analysis of HEAO 1 modulation collimator data leading to an improved position determination and a new optical counterpart candidate for the transient X-ray source A0538-66 is reported. Data obtained during five outbursts, all of which were separated by 16.7 days or a small multiple thereof, indicates that the outbursts, although of varying duration, intensity, and hardness ratio originated from the same source, at a position of 5 h 35 min 42.7 sec RA and 66 deg 53 arcmin 44 arcsec dec. The improved position determination is found to exclude the previously suggested optical counterpart, and a search of archive plates of the Large Magellanic cloud in the refined error regions has lead to the tentative identification of a B-type star with an observed B variability of 1 mag with the X-ray source.

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