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Transient Disks and Mass Transfer in U Cephei

Published online by Cambridge University Press:  14 August 2015

Edward C. Olson
Edward C. Olson*
Affiliation:
University of Illinois, Urbana, Illinois

Extract

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Conspicuous, variable photometric contamination was observed during primary eclipses of the totally eclipsing Algol-like system U Cep from late-1974 to late-1977. Excess light was particularly prominent between second and third contacts, and originated mainly in optically thick accretion disks surrounding the B-type hot component. Observations of such disks were obtained with uvby (I) photometry during 10 eclipses, using the 1.0 M and 0.4 M reflectors at Prairie and Kitt Peak National Observatories. Figure 1 shows ultraviolet observations between internal contacts for active (October, 1975) and quiescent eclipses. The light excess over quiescent levels was converted to flux distributions Lλ c relative to the quiescent visual flux of. the G-star.

Information

Type
V. Algol and Algols
Information
Symposium - International Astronomical Union , Volume 88: Close Binary Stars: Observations and Interpretation , 1980 , pp. 243 - 247
Copyright
Copyright © Reidel 1980 

References

Crawford, R. C., and Olson, E. C.: 1979, Publ. Astron. Soc. Pacific, in press.Google Scholar
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Plavec, M., and Koch, R. H.: 1979, preprint.Google Scholar