The infrared counterpart of the Z source GX5-1

Details The infrared counterpart of the Z source GX5-1 The infrared counterpart of the Z source GX5-1

2000-05-15

arxiv.org/abs/astro-ph/0005289v1

Mon.Not.Roy.Astron.Soc. 315 (2000) L57

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03680.x

We have obtained UKIRT infrared observations of the field of the bright Galactic Z source GX5-1. From an astrometric plate solution tied to Tycho-ACT standards we have obtained accurate positions for the stars in our field which, combined with an accurate radio position, have allowed us to identify the probable infrared counterpart of GX5-1. Narrow-band photometry marginally suggests excess Br-gamma emission in the counterpart, supporting its association with an accretion-disc source. No significant variability is observed in a limited number of observations. We compare the H and K magnitudes with those of other Z sources, and briefly discuss possible sources of infrared emission in these systems.

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