The period and amplitude variations of δ Scuti star HD 93044

Beijing Astronomical Observatory, Chinese Academy of Sciences, 100080 Beijing, China e-mail: lzl@bao01.bao.ac.cn

Received: 9 February 1994
Accepted: 17 October 1995

Abstract

The δ Scuti variable star HD 93044 was observed with the 60 cm telescope at the Xinglong Station of the Beijing Astronomical Observatory from 1992 to 1993. Period analyses were made for the 1992 data set, the 1993 data set, and the combined 1992–1993 data set. Besides the known three frequencies: 11.90809, 16.798 and 22.074 cd^-1, two new frequencies of 2.086 and 10.489 cd^-1 were found. Some amplitude variations of two pulsation components (11.90809, 22.074 cd^-1) were obvious. The new frequency of 2.086 cd^-1 might be the interaction mode from which the resonances can occur and then lead to the nonlinear phenomena in the δ Scuti variable star.