Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1627b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1627-1638.
Astronomy and Astrophysics
Astronomy
10
Cepheid Variables, Stellar Mass Accretion, Stellar Rotation, Stellar Spectra, Astronomical Photometry, Light Curve, Stellar Magnitude, Stellar Temperature
Scientific paper
We describe new six-color intermediate-band photometric observations of U Cephei, obtained during an interval of consistently low mass-transfer activity. We use the new Wilson eclipsing binary computer program to obtain several photometric solutions, which incorporate the rapid rotation of the hot star. Residual trends for solutions using all observations show the absorbing effect of the stream between phases 0.7 and 0.96. A second set of solutions, omitting data in this phase range, leads to more satisfactory results. Our photometric mass ratio is somewhat smaller than the spectroscopic values found by both Batten (1974) and Tomkin (1981). Differences between our solutions and those of Rafert and Markworth (1991) are probably due to residual contamination of light curves by circumstellar matter.
Burnett Brian J.
Etzel Paul B.
Olson Edward C.
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