Spectrophotometric follow-up of GU Mus, the (X-ray) Nova Muscae 1991

Details Spectrophotometric follow-up of GU Mus, the (X-ray) Nova Muscae 1991 Spectrophotometric follow-up of GU Mus, the (X-ray) Nova Muscae 1991

1997-09-09

arxiv.org/abs/astro-ph/9709071v1

Astronomy and Astrophysics

Astrophysics

10 pages, 6 .ps figures, LaTeX A&A style file l-aa version 3, accepted by Astronomy & Astrophysics, main journal

Scientific paper

The spectrophotometric follow-up of the X-ray nova GU Mus (=GS 1124-68) is presented. We have analysed 128 B, V and R frames and 19 optical spectra, collected at ESO-La Silla, from the epoch of the discovery to January 1992. The optical lightcurve appears to be typical for a X-ray nova and exhibits secondary maxima in coincidence with the X-ray ones. The spectra show that Balmer and He II 4686 emission lines and the N III 4640 emission blend widen during the decline. A possible explanation of this behaviour is proposed and applied to the spectral evolution of other X-ray novae.

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