CC Comae - an apparent secular filling factor change

Details CC Comae - an apparent secular filling factor change CC Comae - an apparent secular filling factor change

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..909l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. 909-915.

Astronomy and Astrophysics

Astrophysics

12

Astronomical Photometry, Eclipsing Binary Stars, Light Curve, Mass Transfer, Secular Variations, Cross Correlation, Ephemerides, Stellar Spectra

Scientific paper

Light-synthesis analysis of new u, y, and I observations of CC Com indicates a secular change in q, Omega, and the contact-system filling factor. Even if the implied secular trend is only a temporary light-curve anomaly, the current filling factor, 4.4 percent, is so small that good thermal contact is in peril. The secondary component currently behaves as if good thermal contact exists. The calculated change in q implies a corresponding period change, on conservative mass transfer, that is ruled out by the observations. The light-curve changes, assumed to arise from gas streams or surface activity, mimic changes in q and Omega. This result implies the need for caution in accepting photometric q values.

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