Astronomy and Astrophysics – Astronomy
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32..313k&link_type=abstract
Astronomy Letters, vol. 32, Issue 5, p.313-319
Astronomy and Astrophysics
Astronomy
2
Pacs Numbers 97.10.Sj - 97.80.Hn-D
Scientific paper
We performed photoelectric observations of AS Cam in 2002 2004. Five new times of minima were obtained. Their positions are consistent with the previously found light equation for the system and with the hypothesis that the difference between the observed (15°/100 yr) and theoretical (44°/100 yr) rates of apsidal motion results from the presence of a third body in the system. A Fourier analysis of two observational data sets, 1968 1970 and 2002 2004, reveals, with a high significance, periodic light variations with a frequency of ω 0 = 1.0950 ± 0.0001d-1 and an amplitude of ˜0 . m 020, which are probably caused by the radial pulsations of one of the components. We found a seasonal phase shift of these oscillations that may be produced by other periodic processes in the system. We show that the fairly large scatter of observed times of minima about the theoretical curve of the light equation can be explained by the presence of pulsations. Using the 2002 and 2004 observations as an example, we show that including the pulsations reduces this scatter.
Kozyreva Valentina S.
Zakharov Andrey I.
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