Abstract
Radial velocity oscillations were observed in the rapidly oscillating Ap star Gamma Equulei. Two peaks in the power spectrum are clearly significant, at v = 1366 and 1427 micro-Hz, in contrast to the single peak at 1339 micro-Hz from an earlier observation reported by Kurtz (1983). These observations suggest that several modes of Gamma Equ with different (l, n) are excited at various times, with a fundamental spacing of roughly 58 micro-Hz. The ratio of velocity to brightness oscillations is inferred to be of order 30 km/s/mag or greater, similar to the approximately 80 km/s/mag observed for the much lower amplitude solar p-mode oscillations.
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