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 Bedding, T. R. and Borre, C. C. and Christophe, S. and Daszynska-Daszkiewicz, J. and Fox-Machado, L. and Garcia Hernandez, A. and Ghasemi, H. and Handberg, R. and Hansen, H. and Hasanzadeh, A. and Houdek, G. and Johnston, C. and Justesen, A. B. and Alicavus, F. Kahraman and Kotysz, K. and Latham, D. and Matthews, J. M. and Monster, J. and Niemczura, E. and Paunzen, E. and Sanchez Arias, J. P. and Pigulski, A. and Pepper, J. and Richey-Yowell, T. and Safari, H. and Seager, S. and Smalley, B. and Shutt, T. and Sodor, A. and Suarez, J. C. and Tkachenko, A. and Wu, T. and Zwintz, K. and Forteza, S. Barcelo and Brunsden, E. and Bognar, Z. and Buzasi, D. L. and Chowdhury, S. and De Cat, P. and Evans, J. A. and Guo, Z. and Guzik, J. A. and Jevtic, N. and Lampens, P. and Lares-Martiz, M. and Lovekin, C. and Li, G. and Mirouh, G. M. and Mkrtichian, D. and Monteiro, M. J. P. F. G. and Nemec, J. M. and Ouazzani, R. M. and Pascual-Granado, J. and Reese, D. R. and Rieutord, M. and Rodon, J. R. and Skarka, M. and Sowicka, P. and Stateva, I. and Szabo, R. and Weiss, W. W. (2019) The first view of δ Scuti and γ Doradus stars with the TESS mission. Monthly Notices of the Royal Astronomical Society, 490 (3). pp. 4040-4059. ISSN 0035-8711

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

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Jul 2022 00:35
Last Modified: 15 Aug 2022 04:56
Uncontrolled Keywords: asteroseismology; techniques: photometric; stars: chemically peculiar; stars: interiors; stars: variables: δ Scuti; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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