arXiv subjects

A. Dariush

Publications and source records attributed to A. Dariush.

75 records · Page 5Linked to original sources

arXiv2005

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

Photometric and spectroscopic observations and analysis of the eccentric eclipsing binary V459 Cassiopeiae (e=0.0244) were performed by Lacy et al. (2004). Observations of minimum light show the presence of apsidal motion. In order to find the observed rate of apsidal motion, I followed the procedure described by Guinan & Maloney (1985). A new observed rate of apsidal motion of 15.2/100 yr with a period of 2400 yr is computed which is not in agreement with the one reported earlier. 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 of the system. The theoretical value of 2.64/100 yr is obtained which is 5.75 times smaller than the observed rate of the apsidal motion.

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arXiv2005

Photometric Observation And Period Study of GO Cygni

Photometric observations of GO Cyg were performed during the July-October 2002, in B and V bands of Johnson system. Based on Wilson's model, the light curve analysis were carried out to find the photometric elements of the system. The O-C diagram which is based on new observed times of minima suggests a negative rate of period variation (dP/dt<0) for the system.

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arXiv2004

Photometric Observation and Apsidal motion Study of V1143 Cyg

Photometric observations of the eccentric eclipsing binary V1143 Cygni were performed during the August-September 2000 and July 2002, in B and V bands of the Johnson system. The analysis on both light curves was done separately using the 1998 version of Wilson's LC code. In order to find a new observed rate of apsidal motion, we followed the procedure described by Guinan and Maloney (1985). A new observed rate of apsidal motion of 3.72 degrees/100yr was computed which is close to the one reported earlier by Khaliullin (1983), Gimenez and Margrave (1985), and Burns et al.(1996).

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