Astrometry of the 4U1543-47 X-Ray Transient Optical Counterpart

Details Astrometry of the 4U1543-47 X-Ray Transient Optical Counterpart Astrometry of the 4U1543-47 X-Ray Transient Optical Counterpart

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4165i&link_type=abstract

HST Proposal ID #4165

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #4165

Scientific paper

We propose to obtain relative WF/PC astrometry of the optical counterpart of the 4U1543-47 soft X-ray transient, currently in outburst. Ground-based observations made in 1989 during the quiescent state show that an apparently normal V=16.7 A-type star is located (within +/- 0.1 arc-sec) at the position of the V=14.6 image seen during outburst. While it is highly unlikely that the A star is the companion of the X-ray source, it appears nevertheless to be located at the same distance from us. Accurate relative astrometry between images obtained with the WF/PC during outburst and later, during quiescence, will allow us to find whether or not, on the basis of position alone, the A-star is somehow related to the X-ray source. If not, the images may allow us to discover the true optical counterpart of 4U1543-47.

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