Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..373s&link_type=abstract
Astronomy and Astrophysics, Vol.276, NO. 2/SEPII, P. 373, 1993
Astronomy and Astrophysics
Astrophysics
10
Stars: Individual: Nova Muscae 1991, Ultraviolet: Stars, Stars: Novae, Cataclysmic Variables, X-Rays: Stars
Scientific paper
We report on a series of ultraviolet spectroscopic observations made with the lUE satellite, which sampled critical outburst stages of the soft X-ray transient Nova Muscae 1991. Continuum light curves, and multi-epoch line analysis are presented. The λλ1500-3300 continuum fits approximately the "canonical" fv∝ν1/3 power law expected for thermal emission from steady state accretion disk, while such a fit over the entire IUE band is less satisfactory. The emission line spectrum contains prominent high ionization lines of C IV (λ1549) and N V (λ1240) at each epoch; He II (λl640) is detected at most epochs, but is marginally detected or undetected in several cases. Weaker lines are seen at intermittent epochs, including possible detection of some lower ionization species of carbon and nitrogen. The latter occur most frequently about 6 weeks post-outburst and thereafter, and may be indicative of the increasing prominence of a cooler, outer disk region or related to the onset of a transition to an optically thin state in the disk. There was a softening of the continuum occurring about 6 weeks post-outburst as well. Several galactic absorption lines are detected, in addition to complex, bands of blended absorption lines or a pseudo- continuum of unresolved emission lines which evolve significantly over the course of the event. Broad Ly-α absorption is seen at each epoch. Derivation of the interstellar extinction towards the source, and its implications on distance estimates is discussed. Comparisons between the UV spectra of Nova Muscae 1991 and those of several previous soft X-ray transient events and steady low mass X-ray binary systems are made.
González-Riestra Rosario
Shrader Chris R.
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