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The Masses and the Radii of the Components of U Cep

Published online by Cambridge University Press:  12 April 2016

J.R.W. Heintze  and
R.H. van Gent
J.R.W. Heintze
Affiliation:
Astronomical Institute Utrecht,P.O. Box 80 000, 3508 TA Utrecht,The Netherlands
R.H. van Gent
Affiliation:
Astronomical Institute Utrecht,P.O. Box 80 000, 3508 TA Utrecht,The Netherlands

Extract

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This system needs no introduction after the publications of Batten (1974) and of Hall (1975). According to Plavec (1983) the spectral type of the primary is B8 V.

Tomkin (1981) obtained simultaneously the radial velocities of the primary (≡ RV1) and the secondary (≡ RV2) of U Cep in the near-infra red, which resulted in the following parameters (in km/s):

From the slope of the RVCZ around ϕ= 0, he finds:

The (M/M⊙ ; R/R⊙ ) values as published by Tomkin are (4.2; 2.7) for the primary and (2.6; 4.9) for the secondary.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 107: Algols , 1989 , pp. 261 - 263
Copyright
Copyright © Kluwer 1989

References

Batten, A.H.: 1974, Publ. Dom. Astrophys. Obs. 14, 91 Google Scholar
Hall, D.S.: 1975, Acta Astronomica 25, 1 Google Scholar
Hall, D.S. & Keel, W.C.: 1977, Acta Astronomica 27, 167 Google Scholar
Hardie, R.H.: 1950, Astrophys. J. 112, 542 Google Scholar
Markworth, N.L. 1979, Mon Not. R. Astr. Soc. 187, 699 CrossRefGoogle Scholar
Plavec, M.J.: 1983, Astrophys. J. 275, 251 Google Scholar
Struve, O.: 1944, Astrophys. J. 99, 222 Google Scholar
Tomkin, J.: 1981, Astrophys. J. 244, 546 CrossRefGoogle Scholar
Wilson, R.E.: 1979, Astrophys. J. 234, 1054 CrossRefGoogle Scholar