Radial velocity observations reveal multimode oscillations in Gamma Equulei

Details Radial velocity observations reveal multimode oscillations in Gamma Equulei Radial velocity observations reveal multimode oscillations in Gamma Equulei

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330l..51l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 1, 1988, p. L51-L53.

Astronomy and Astrophysics

Astrophysics

47

A Stars, Peculiar Stars, Power Spectra, Radial Velocity, Stellar Oscillations, Variable Stars, Quantum Numbers, Signal To Noise Ratios, Stellar Spectra

Scientific paper

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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