Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..309r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 15, 1984, p. 309-321.
Astronomy and Astrophysics
Astronomy
12
Binary Stars, Iue, Stellar Spectra, Ultraviolet Astronomy, Chromosphere, Emission Spectra, Helium, Light Curve, Line Spectra
Scientific paper
The authors present IUE observations of AW UMa and SW Lac. These stars are the most extreme representatives of the A- and W-types of W UMa stars and might therefore be expected to differ most in their properties. The authors find that the stars are similar in their transition region emission (N V, C IV, Si IV) but differ markedly in their chromospheric emission (Mg II). In SW Lac the strength of the He II line is consistent with current understanding of its excitation by the coronal X-ray flux. In AW UMa the He II strength is larger than might be anticipated given the low upper limit on the X-ray emission of this star. The authors obtain an upper limit to the phase dependence of the transition region lines in AW UMa.
Brunt Christopher
Pringle James E.
Rucinski Slavek M.
Vilhu Osmi
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