Statistics of categorized eclipsing binary systems Lightcurve shapes, periods, and spectral types

Details Statistics of categorized eclipsing binary systems Lightcurve shapes, periods, and spectral types Statistics of categorized eclipsing binary systems Lightcurve shapes, periods, and spectral types

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...54..211g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 54, Nov. 1983, p. 211-220.

Astronomy and Astrophysics

Astrophysics

21

Eclipsing Binary Stars, Light Curve, Orbital Elements, Stellar Spectra, Spectrum Analysis, Statistical Analysis, Stellar Evolution

Scientific paper

The statistics of the light curve morphologies, eclipse depths, orbital periods, and spectral types of about 1000 eclipsing binary systems are examined, after attempting to subdivide these binaries into various basic evolutionary categories. The applicability of statistical criteria, based on light curve morphologies and eclipse depths, for the categorization of eclipsing binaries has been found more limited than previously believed. In particular, EW-type light curves turn out to be good indicators of contact systems (though not conversely), while EA- and EB-type light curves have little physical significance. Moreover, the study reveals a strong deficit of short-period noncontact systems in the whole spectral range, together with an underabundance of early-type contact binaries (compared with the number of late-type contact pairs). Interestingly, the distribution of evolved Algol-type systems is shifted, on average, to periods longer than those of unevolved detached systems in the OB and early A spectral range (and to shorter periods in the F spectral range).

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