Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....37..263h&link_type=abstract
Astronomy and Astrophysics, vol. 37, no. 2, Dec. 1974, p. 263-273.
Astronomy and Astrophysics
Astrophysics
30
B Stars, Cepheid Variables, Light Curve, Stellar Spectrophotometry, Astrophysics, Gas Flow, Roche Limit, Stellar Atmospheres
Scientific paper
Three photoelectric light curves are analyzed and a photometric solution is found that allows for an irregular surface brightness distribution on the B star and for gas stream absorption. One set of geometrical elements is shown to satisfy all three photoelectric light curves. All three curves suggest that there is a hot spot near the visible pole of the B star and one near its equator on the trailing side. Strong gas stream absorption is seen in all three before and during the falling branch of primary eclipse; absorption reappears near fourth contact, about one-third as strong. There is a correlation such that the light at totality slants up when the period decreases and down when the period increases. Difficulties with Batten's suggestion that chromospheric activity on the subgiant is causing the light variations during totality are found. With the new geometric elements and Batten's new mass ratio, the subgiant fills its Roche lobe. Also, the large discrepancy which Batten points out between observed and calculated eclipse depths is virtually removed.
Hall David S.
Walter Katrin
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