ASTRONOMY AND ASTROPHYSICS Spectrophotometric follow - up of GU Mus , the ( X - ray ) Nova Muscae 1991 ?
نویسنده
چکیده
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 ESOLa 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 λ4686 emission lines and the N iii λ4640 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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