Theoretical seismic properties of pre-main sequence gamma Doradus pulsators

Abstract

Context. gamma Doradus (gamma Dor) are late A and F-type stars pulsating with high order gravity modes (g-modes). The existence of different evolutionary phases crossing the gamma Dor instability strip raises the question of the existence of pre-main sequence (PMS) gamma Dor stars. Aims. We intend to study the differences between the asteroseismic behaviour of PMS and main sequence (MS) gamma Dor pulsators as it is predicted by the current theory of stellar evolution and stability. Methods. We explore the adiabatic and non-adiabatic properties of high order g-modes in a grid of PMS and MS models covering the mass range 1.2 Msun < Mstar < 2.5 Msun. Results. We derive the theoretical instability strip (IS) for the PMS gamma Dor pulsators. This IS covers the same effective temperature range as the MS gamma Dor one. Nevertheless, the frequency domain of unstable modes in PMS models with a fully radiative core is larger than in MS models, even if they present the same number of unstable modes. Moreover, the differences between MS and PMS internal structures are reflected on the average values of the period spacing as well as on the dependence of the period spacing on the radial order of the modes, opening the window to the determination of the evolutionary phase of gamma Dor stars from their pulsation spectra.

9 pages, 17 figures, accepted for publication in A&A

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• Pulsational instability of pre-main sequence models from accreting protostars. I. Constraining the input physics for accretion with spectroscopic parameters and stellar pulsations
• gamma Doradus pulsation in two pre-main sequence stars discovered by CoRoT
• KIC 9533489: a genuine gamma Doradus-delta Scuti Kepler hybrid pulsator with transit events
• Regular frequency patterns in the young delta Scuti star HD 261711 observed by the CoRoT and MOST satellites
• The Pre-main Sequence: Challenges and Prospects for Asteroseismology
• The potential of space observations for pulsating pre-main sequence stars