Discovery of pulsations in the AM star HD 13079
Leone, F.; Sagar, R.; Kurtz, D. W.; Catanzaro, G.; Ashoka, B. N.; Seetha, S.; Martinez, Peter; Gupta, S. K.; Chaubey, U. S.; Raj, E.; Kasturirangan, K.
South Africa, India, Italy
Abstract
Pulsation in cool main-sequence Am stars is a rare phenomenon observed in a few marginal Am stars and only one classical Am star. The chemically peculiar star HD 13079 is shown to be pulsating with a 78-min period and a peak-to-peak B amplitude of 0.02mag. The Hipparcos parallax, uvbyβ photometry and pulsations together suggest that HD 13079 is an Am star near the zero-age main sequence, and that it is a fundamental-mode pulsator on the red edge of the instability strip.