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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 Lλc relative to the quiescent visual flux of. the G-star.

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
Hall, D. S., and Keel, W. C.: 1977, Acta Astron. 27, pp. 167–177.Google Scholar
Plavec, M., and Koch, R. H.: 1979, preprint.Google Scholar