Spectroscopic Identification of the Infrared Counterpart to GX5-1

Details Spectroscopic Identification of the Infrared Counterpart to GX5-1 Spectroscopic Identification of the Infrared Counterpart to GX5-1

2003-02-12

arxiv.org/abs/astro-ph/0302241v1

Mon.Not.Roy.Astron.Soc. 340 (2003) L13

Astronomy and Astrophysics

Astrophysics

accepted for publication as a Letter in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06519.x

Using CGS4 on UKIRT, we have obtained a 1.95-2.45 micron infrared spectrum of the primary candidate counterpart to the bright Z LMXB GX5-1. IR photometry by Naylor, Charles, & Longmore (1992) and the astrometry of Jonker et al. (2000) had previously identified this star as the most likely counterpart to GX5-1. The spectrum presented here clearly shows Brackett gamma and He lines in emission, for the first time confirming the identity of the counterpart. Similar to our previous spectroscopy of the Z source LMXBs Sco X-1 and Sco X-2 (Bandyopadhyay et al. 1999), the K-band spectrum of GX5-1 shows emission lines only. We briefly discuss the implications of this spectrum for the nature of the Z sources.

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