Frequency Analysis of Photographic Observations of Pulsating Stars

Astronomy and Astrophysics – Astronomy

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Stars: Rr Lyrae, Individual: Rw Ari, Bk Dra, Cepheids, Individual: V477 Oph, Fourier Analysis, Mode Identifications

Scientific paper

The Fourier analysis are performed for photoelectric and photographic B-observations (Goranskij and Shugarov, 1979) of RR Lyrae star RW Ari. Besides the main frequency f0 and four its first harmonics two more frequencies are found: f1=f0/3 and f2=0.711f0 c/d. It permits to identify frequencies: f0 as fs, introduced by us earlier (Bezdenezhnyi, 1997b) for RR Lyrae star T Sex, and f2 - as f1H. Such analysis of photographic author's observations of RR Lyrae star BK Dra is performed too. It is shown that BK Dra is a multiperiodic variable star. Its frequencies identifications are carried out and given. Three data sets of Cepheid V477 Oph: visual author's (Bezdenezhnyi and Mandel, 1977), photographic Mandel's (1970) observations and (O-C) - residuals (Hacke, 1988) show that V477 Oph apparently can be referred to bimodal Cepheids.

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