Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5697c&link_type=abstract
HST Proposal ID #5697
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #5697 Stellar Astrophysics X-Ray Binaries
Scientific paper
Circinus X-1 is a very strong and highly variable X-ray, IR and radio source. Its optical identification was, until very recently, wrongly attributed to a star which recent NTT observations, done in superb seeing, have resolved in three objects.Of these one, very red, coincides with the accurate VLA position for the radio source (varying in phase with the X-ray), and is thus the real candidate. Only HST can now do meaningful work on the true counterpart of Cir X-1: even small seeing conditions variations would render incomparable measurements taken from the ground over the 16.6 day (binary?) source cycle. A new FOS spectrum, taken at critical time during the cycle, will help to understand this 17-19 mag variable object, responsible for a truly bizarre X-ray/radio object.
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