The unusual classical Cepheid HR 7308: 1966?1969

Abstract

The small-amplitude classical cepheid HR 7308 has the shortest period known in our Galaxy for a classical cepheid. 1966–1969 photoelectric observations together with more recent data show a period of 1\(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\cdot}$}}{d}\)49078 with sinusoidal light variations. Except for the presence of the beat period, no secondary period can be found in the extensive 1966 data. The lack of a secondary period near p1/p0 = 0.7 sets HR 7308 apart from many other short-period classical cepheids.