Apsidal Motion Studies: DI Her



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Apsidal Motion Studies: DI Her

APT photometry of the eccentric eclipsing binaries DI Her, AS Cam, and V380 Cygni continued through 1996. Emphasis focused on obtaining photometry of the eclipses to determine accurate timings as part of an ongoing apsidal motion study. Guinan and astronomy student J. Marshall have carried out a new apsidal motion study yielding a revised rate of yryr. This apsidal motion rate is close to that found earlier by Guinan, Marshall & Maloney (IBVS 4101). Analysis of the residuals shows no evidence of systematic or periodic variations to a level of about day. No evidence of changes in the inclination of the orbit was found in the constancy of the eclipse depths over time. From this data, there is no support for the suggestion of a perturbing third star in this system.



Astronomy
Fri Nov 8 13:37:39 EST 1996