Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127...84r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 1, Oct. 1983, p. 84-92.
Astronomy and Astrophysics
Astronomy
46
Eclipsing Binary Stars, Stellar Spectra, Stellar Spectrophotometry, Ultraviolet Photometry, Interstellar Extinction, Spectral Correlation, Spectral Energy Distribution, Ultraviolet Astronomy
Scientific paper
New observations of 17 southern W UMa systems are discussed together with previous uvby data for 44 systems to determine properties of violet and ultraviolet spectral distributions and to relate them to the period-colour relation. The interstellar reddening correction δm1 extends from -0.02 to +0.10, which could be interpreted by a plausible range of metallicities; the most positive values of δm1 and largest ultraviolet excesses are observed for systems having the shortest periods at a given spectral type. The reddening corrections δc1 are close to zero and are only slightly positive for earlier spectral types (mean δc1 = +0.04 for (b-v)0 < 0.31) indicating only very slight evolutionary advancement. Traces of a δc1 = -δm1 correlation for least evolved systems (smallest δc1) leave the possibility of intrinsic excesses still open.
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