The infrared counterpart of GX 13 + 1

Details The infrared counterpart of GX 13 + 1 The infrared counterpart of GX 13 + 1

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1325g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, April 1992, p. 1325-1329.

Astronomy and Astrophysics

Astronomy

13

Giant Stars, Infrared Sources (Astronomy), Late Stars, X Ray Binaries, Accretion Disks, Galactic Bulge, Infrared Photometry, Interstellar Extinction, Stellar Luminosity

Scientific paper

A bright (K = 12) IR source is discovered which is likely the counterpart to the bright galactic-bulge X-ray source GX 13 + 1. Observations with the MMT IR photometer and the Rochester IR Array camera at the IRTF allow determination of the source position to about 0.7 arcsec, allow the IR colors to be measured, and show no variability on a 1-yr timescale. Four possible sources for the IR emission are considered and it is most likely due to a K-giant secondary. The discovery of a late-type giant secondary in GX 13 + 1 is contrary to the expectation that low-mass X-ray binaries which show quasi-periodic oscillations (QPO) have giant companions, while those which do not show QPO (like GX 13 + 1) have dwarf secondaries. The relation between the size of the scattered X-ray halo and the Av inferred from the IR observations is compared to that found in other X-ray sources.

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