The Blazhko effect in observations of XZ Cygni.
Abstract
An analysis was made of the Blazhko effect in the RR Lyrae star XZ Cyg using 410 times and brightnesses of primary maxima obtained between 1905 and 1973. A secondary periodicity was found to exist for XZ Cyg, the period of this variation being about 57d38 until JD2438500 (1964) and thereafter about 58d7 Mean curves are derived for the 57d38 and 58d7 variations. It is shown that the increase in the secondary period can be explained under the assumption that the secondary period is a beat period involving interference between the primary periodicity and another periodicity. Key words: Blazhko effect - period change - RR Lyrae stars
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 1975
- DOI:
- 10.1086/129794
- Bibcode:
- 1975PASP...87..465S