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Constraints on the Cessation of Eclipses in SS Lacertae and Their Implications for System Evolution

Published online by Cambridge University Press:  07 August 2017

E. F. Milone ,
C. R. Stagg  and
S. J. Schiller
E. F. Milone
Affiliation:
RAO, Department of Physics and Astronomy, The University of Calgary, 2500 University Dr., NW, Calgary, Alberta, Canada T2N 1N4
C. R. Stagg
Affiliation:
RAO, Department of Physics and Astronomy, The University of Calgary, 2500 University Dr., NW, Calgary, Alberta, Canada T2N 1N4
S. J. Schiller
Affiliation:
South Dakota State University, Department of Physics, Box 2219, Brookings, South Dakota 57007-0395

Abstract

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SS Lac, a probable member of the open cluster NGC 7209, and a target system of several apsidal motion programs and of our binaries-in-clusters program for the past decade, is no longer eclipsing. The sudden disappearance of eclipses is now well documented. Zakirov and Azimov (IBVS 3487, 1990) and Schiller et al. (BAAS 23, 879, 1991) announced the current nonexistence of eclipses based on extensive photometry. Photographic and visual observations indicate cessation in the 1950–1951 season. Here we describe recent radial velocity work, modeling of published light curves, plans for further investigation and discuss implications of the cessation for system evolution.

Type
Oral and Contributed Papers
Information
Symposium - International Astronomical Union , Volume 151: Evolutionary Processes in Interacting Binary Stars , 1992 , pp. 479 - 482
Copyright
Copyright © Kluwer 1992 

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