Optical and infrared observations of Circinus X-1

Details Optical and infrared observations of Circinus X-1 Optical and infrared observations of Circinus X-1

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260l...7m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. L7-L10.

Astronomy and Astrophysics

Astronomy

37

Infrared Astronomy, Variable Stars, Visual Observation, X Ray Stars, Astronomical Photometry, X Ray Sources

Scientific paper

I present optical VRI and IR JHK images of the X-ray source Circinus X-1. A superposition of the best optical and IR images clearly shows that Cir X-1 should be identified with the southernmost of a group of three stars located within a 1.5-arcsec diameter region. Photometry is obtained from both the visible and the IR images and is used to study the variability of the source. Cir X-1 appears as a very red point source having V - I of about 2.9 mag and V - K of about 10 mag during its quiescent phase.

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