CIR-X1 Revisited: Spectroscopy Throughout the 16.6 Day Cycle of the Real Optical Candidate.

Details CIR-X1 Revisited: Spectroscopy Throughout the 16.6 Day Cycle of the Real Optical Candidate. CIR-X1 Revisited: Spectroscopy Throughout the 16.6 Day Cycle of the Real Optical Candidate.

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3432c&link_type=abstract

HST Proposal ID #3432

Computer Science

Hst Proposal Id #3432

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 WFPC exposure for target acquisition and a sequence of 4 FOS spectra, taken at critical time during the cycle, will probably suffice to understand this 17-19 mag variable object, responsible for a truly bizarre X-ray/radio object.

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