Nonradial p-modes in the G9.5 giant epsilon Oph? Pulsation model fits to MOST photometry

Abstract

The G9.5 giant eps Oph shows evidence of radial p-mode pulsations in both radial velocity and luminosity. We re-examine the observed frequencies in the photometry and radial velocities and find a best model fit to 18 of the 21 most significant photometric frequencies. The observed frequencies are matched to both radial and nonradial modes in the best model fit. The small scatter of the frequencies about the model predicted frequencies indicate that the average lifetimes of the modes could be as long as 10-20d. The best fit model itself, constrained only by the observed frequencies, lies within 1 sigma of eps Oph's position in the HR-diagram and the interferometrically determined radius.

References in corpus (2)

• Pulsations detected in the line profile variations of red giants: Modelling of line moments, line bisector and line shape
• Reduction of time-resolved space-based CCD photometry developed for MOST Fabry Imaging data

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• Solar-like oscillations in a metal-poor globular cluster with the HST
• Asteroseismology of the Hyades red giant and planet host epsilon Tauri
• Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE - Constellation