APSIDAL MOTIONS OF 27 BINARY SYSTEMS IN THE SMALL MAGELLANIC CLOUD

作者：Hong Kyeongsoo^*; Kim Seung Lee; Lee Jae Woo; Lee Chung Uk; Yushchenko Alexander V; Kang Young Woon

来源：Astronomical Journal, 2015, 150(1): 1.

DOI：10.1088/0004-6256/150/1/1

• binaries: eclipsing
• Magellanic Clouds
• stars: early-type
• stars: fundamental parameters

We present the periods of apsidal motion for 27 early-type eclipsing binaries with high eccentricity located in the Small Magellanic Cloud. New times of minima were derived from the light curves constructed by the MACHO, Optical Gravitational Lensing Experiment (OGLE)-II, and OGLE-III survey data. The eclipse timing diagrams of the binary systems were analyzed using those timings and the elements of apsidal motions were obtained in detail for the first time. The apsidal motion periods of all systems were estimated by detailed analysis of both eclipse timings and light curves; a strong correlation value between both methods is shown. We confirm that OGLE-SMC-ECL-2194 shows the shortest known apsidal motion period of 7.1 yr in a detached system with main sequence stars. Nineteen systems show intermediate apsidal motion periods between 10 and 100 yr, and seven systems exhibit long apsidal periods of more than 100 yr.

• 出版日期2015-7