Pulsations in the eclipsing variable system AS Camelopardalisстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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°) and theoretical (44°) rates of apsidal motion is related to the presence of a third body in the system. A Fourier analysis of two sets of observations, 1968-1970 and 2002-2004, reveals, with a high significance, periodic brightness variations with frequency ω0 = 1.0950 ± 0.0001 1/day and amplitude ~0.020 magnitude, which are probably attributable to the radial pulsations of one of the components. We found a seasonal phase shift of these pulsations 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.