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A New Apsidal Motion Determination of the Eclipsing Binary Star V459 Cassiopeiae: A Possible Discrepancy Between the Theory and the Observation

By A. Dariush, V Cassiopeiae (bv and Gsc Vmax

Abstract

Photometric and spectroscopic observations and analysis of the eccentric eclipsing binary V459 Cassiopeiae were performed by Lacy et al.(2004). The results show that V459 Cas has a slightly eccentric orbit with e = 0.0244. Observation of minimum light show the presence of apsidal motion. In order to find a new observed rate of apsidal motion, I followed the procedure described by Guinan & Maloney (1985). A new observed rate of apsidal motion of 14 ◦.5 /100 yr with a period of 2500 yr is computed which is not in agreement from the one reported earlier by Lacy et al.(2004). Also the advance of the periastron is calculated theoretically by taking into account the Newtonian (classical) and general-relativistic effects according to the physical and orbital parameters given by Lacy et al.(2004). The theoretical value of 2 ◦.64 /100 yr is obtained which is 5.5 times smaller than the observed rate of the apsidal motion

Topics: Key words, binaries, stars, V459 Cassiopeiae
Year: 2005
OAI identifier: oai:CiteSeerX.psu:10.1.1.315.7668
Provided by: CiteSeerX
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