Close Binary Systems of Short Period

  • E. Budding
Part of the Astrophysics and Space Science Library book series (ASSL, volume 91)


Information on 406 close binary systems with periods less than 1.5 days for which the primary is of known spectral type, is assembled from recent sources. The organization of the presentation depends on a light curve descriptor which takes the values EA1, EA2, EA3, EB, EW and E 11. Within these groups the distribution in the spectral type (s): period (P) plane is examined. An additional distribution of this kind is presented for 311 EA2 candidate stars (evolved Algols), with periods of up to 15 days.

Recent empirical information on Main Sequence stars is presented for comparison, and the condition that a Main Sequence component of a binary system be in “contact” with its surrounding Roche lobe provides an interesting discriminant in relation to the (s:P) distributions of the different light curve groups. Certain anomalous cases come to light.

Concerning the EW (W UMa) group, detailed investigation of a particular case reveals the extent of parameter indeterminacy. A compelling case for “contact” can only be found among the accumulation which occurs at later spectral type.

A recommendation is made for a simple but more quantitative means of defining light curve type. Such a parameter could be of considerable significance in relation to statistical tests of binary evolution theory.


Light Curve Light Curf Spectral Type Main Sequence Main Sequence Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1981

Authors and Affiliations

  • E. Budding
    • 1
  1. 1.Department of AstronomyUniversity of ManchesterManchesterEngland

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