Observational evidence of unstable behavior for the W UMa type binary system V1073 Cygni is presented in this paper. Around 1939 the period of the binary suddenly decreased by 0 580 seconds and again suddenly decrease...Observational evidence of unstable behavior for the W UMa type binary system V1073 Cygni is presented in this paper. Around 1939 the period of the binary suddenly decreased by 0 580 seconds and again suddenly decreased by 0 746 seconds around 1981.Obvious variable O’ Connell effect of the light curves in V can be seen. The relation between the changes in the orbital period and variation in the O’ Connell effect and possible reasons for the unstable behavior of V1073 Cyg were discussed.展开更多
文摘Observational evidence of unstable behavior for the W UMa type binary system V1073 Cygni is presented in this paper. Around 1939 the period of the binary suddenly decreased by 0 580 seconds and again suddenly decreased by 0 746 seconds around 1981.Obvious variable O’ Connell effect of the light curves in V can be seen. The relation between the changes in the orbital period and variation in the O’ Connell effect and possible reasons for the unstable behavior of V1073 Cyg were discussed.
