New Apsidal-motion Elements of the Massive Archetype System Y Cygni
Abstract
New apsidal-motion elements for the massive O type eccentric eclipsing binary Y Cygni are presented. All available times of minima, both newly observed and published in the literature, are analyzed by the Gimenez & Garcia-Pelayo method. These results are confronted with those derived by the solutions of all available radial velocity and photometric observations. An improved value of the mean internal structure constant k2 (for the two nearly identical binary components) is derived. The relativistic effects are weak, being about 5% of the total apsidal motion rate. Ephemerides for predicting primary and secondary eclipses are also given.
- Publication:
-
Massive Stars: From alpha to Omega
- Pub Date:
- June 2013
- Bibcode:
- 2013msao.confE.107W