The first view of δ Scuti and γ Doradus stars with the TESS mission

Antoci, V. and Cunha, M. S. and Bowman, D. M. and Murphy, S. J. and Kurtz, D. W. and Sódor, Ádám and Sódorné Bognár, Zsófia and Szabó, Róbert (2019) The first view of δ Scuti and γ Doradus stars with the TESS mission. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 490. pp. 4040-4059. ISSN 0035-8711

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Abstract

We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilize th 2-min cadence TESS data for a sample of 117 stars to classify thei Russell diagram using Gaia DR2 data. Included within our sample are th eponymous members of two pulsator classes, γ Doradus and SX Phoenicis Our sample of pulsating intermediate-mass stars observed by TESS als allows us to confront theoretical models of pulsation driving in th classical instability strip for the first time and show that mixin processes in the outer envelope play an important role. We derive a empirical estimate of 74 per cent for the relative amplitude suppressio factor as a result of the redder TESS passband compared to the Keple mission using a pulsating eclipsing binary system. Furthermore, ou sample contains many high-frequency pulsators, allowing us to probe th frequency variability of hot young δ Scuti stars, which were lacking i the Kepler mission data set, and identify promising targets for futur asteroseismic modelling. The TESS data also allow us to refine th stellar parameters of SX Phoenicis, which is believed to be a blu straggler.

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