Spectroscopic identification of the infrared counterpart to GX5-1

Using CGS4 on UKIRT, we have obtained a 1.95–2.45 μm infrared (IR) spectrum of the primary candidate counterpart to the bright Z LMXB GX5-1.IR photometry by Naylor, Charles & Longmore and the astrometry of Jonker et al.had previously identified this star as the most likely counterpart to GX5-1.T...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2003-04, Vol.340 (3), p.L13-L16
Main Authors: Bandyopadhyay, R.M., Shahbaz, T., Charles, P.A.
Format: Article
Language:English
Subjects:
accretion
accretion discs
accretion, accretion discs
binaries: close
infrared: stars
stars: individual: GX5-1
X-rays: stars
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Summary:Using CGS4 on UKIRT, we have obtained a 1.95–2.45 μm infrared (IR) spectrum of the primary candidate counterpart to the bright Z LMXB GX5-1.IR photometry by Naylor, Charles & Longmore and the astrometry of Jonker et al.had previously identified this star as the most likely counterpart to GX5-1.The spectrum presented here clearly shows Brackett γ 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.
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.2003.06519.x