摘要
Abstract We present a study of orbital period changes in AH Virginis. We perform a careful literature search for all available minima times, from which we derived a new linear ephemeris and constructed an O - C curve. We found that the orbital period of AH Virginis shows a long-term increase, dP/dt = （2.1869 ± 0.0161） × 10^-7 d yr^-1, and a small periodic variation with a period of 37.19 yr. Since AH Virginis is an over- contact system and the primary component shows strong Ha and Mg II emission lines, we discuss the possible connection between mass transfer, magnetic activity and or- bital period changes.
Abstract We present a study of orbital period changes in AH Virginis. We perform a careful literature search for all available minima times, from which we derived a new linear ephemeris and constructed an O - C curve. We found that the orbital period of AH Virginis shows a long-term increase, dP/dt = （2.1869 ± 0.0161） × 10^-7 d yr^-1, and a small periodic variation with a period of 37.19 yr. Since AH Virginis is an over- contact system and the primary component shows strong Ha and Mg II emission lines, we discuss the possible connection between mass transfer, magnetic activity and or- bital period changes.
基金
Supported by the National Natural Science Foundation of China
