Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1165s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Nov. 1986, p. 1165-1169. Research supported by the
Astronomy and Astrophysics
Astronomy
3
Eclipsing Binary Stars, Stellar Spectra, Astronomical Photometry, Asymmetry, Minima
Scientific paper
In an attempt to quantify the relationship of Crawford and Olson (1979) between the duration of totality and delay of minimum light for disturbed eclipses of U Cep, straight lines are fitted to photometric observations of the system obtained just outside the internal contacts. These show an asymmetry of disturbed eclipses in the sense that the descent to minimum is steeper than the rise from it. This asymmetry violates the basic underlying assumption of the method of Kwee and van Woerden (1956) and is a major contributor to the effect found by Crawford and Olson. The disturbed eclipses of U Cep are little displaced from their predicted times if the midpoint between internal contacts is used as a measure of the time of minimum. The matter producing the excess light thus appears to be distributed in a region concentric with the primary star, but concentrated behind it in the sense of its orbital motion, in agreement with the model of Olson (1976a) and the IUE observations of Plavec (1983).
Delaney Paul A.
Gagne M. V.
Scarfe Colin D.
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