Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..416b&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 416-419 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Binary Stars, Interstellar Extinction, Iue, Supergiant Stars, X Ray Binaries, X Ray Spectra, Stellar Mass Accretion, Stellar Winds, Ultraviolet Spectra
Scientific paper
The first IUE observations of two LMC X-Ray binary candidates, LMC X-1 (star 32) and 1E0501.8 (Sk-7036) are presented. Both sources were observed with IUE at two phases of the optical light curve, to search for possible effects of the X-Ray flux on the primary's wind. From consideration of the 220.0nm interstellar extinction dip and of the overall continuum distribution, the foreground reddening was derived to be E(B-V) = 0.05. The additional reddening in the LMC was derived to be E(B-V)=0.11 for Sk-7036 and E(B-V)=0.32 for LMC X-1. The spectra of Sk-7036 show a significant variation of the continuum, the flux at 1300A being stronger at phase 0.2 by 40% compared to the flux observed at a minimum of the light curve. The latter can be represented by a model atmosphere with Teff=25000K, log g = 3.0, in agreement with the spectral type derived from the optical colors. The UV continuum of star 32 (LCM X-1) can be modeled with Teff=35000K, log g = 3.5, which is appropriate for an 07-9 giant.
Bianchi Luciana
Pakull Manfred
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