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

V AntociStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkM S CunhaInstitute of Astrophysics and Space SciencesD M BowmanKU LeuvenS J MurphyStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkD W KurtzJeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UKT. R. BeddingSydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, AustraliaC C BorreStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkS ChristopheUniversité Paris CitéJ Daszyńska-DaszkiewiczInstytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, PL-51-622 Wrocław, PolandL Fox-MachadoInstituto de Astronomía, Universidad Nacional Autónoma de México, Ap. P. 877, Ensenada, BC 22860, MexicoAntonio García HernándezDepartamento Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, E-18071 Granada, SpainHamed GhasemiDepartment of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, IranR. HandbergStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkH HansenStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkA HasanzadehDepartment of Physics, Faculty of Science, University of Zanjan, P.O. Box 45195-313 Zanjan, IranG. HoudekStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkC JohnstonKU LeuvenA B JustesenStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkF Kahraman AlicavusPhysics Department, Faculty of Sciences and Arts, Çanakkale Onsekiz Mart University, 17100 Çanakkale, TurkeyK KotyszInstytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, PL-51-622 Wrocław, PolandD LathamCenter for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAJ M MatthewsDepartment of Physics and Astronomy, University of British Columbia, Vancouver, CanadaJ MønsterStellar Astrophysics Centre, Ny Munkegade 120, D-8000 Aarhus, DenmarkE NiemczuraInstytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, PL-51-622 Wrocław, PolandE. PaunzenDepartment of Theoretical Physics and Astrophysics, Masaryk University, Kotlarska 2, CZ-611 37 Brno, Czech RepublicJ P Sánchez AriasInstituto de Astrofísica La Plata, CONICET-UNLP, Paseo del Bosque s/n, 1900 La Plata, ArgentinaA PigulskiInstytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, PL-51-622 Wrocław, PolandJ PepperDepartment of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USAT Richey-YowellDepartment of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USAHossein SafariDepartment of Physics, Faculty of Science, University of Zanjan, P.O. Box 45195-313 Zanjan, IranS SeagerDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USAB. SmalleyAstrophysics Group, Keele University, Staffordshire ST5 5BG, UKT ShuttDepartment of Physics, University of York, Heslington, York YO10 5DD, UKA Sódor22 MTA CSFK Lendület Near-Field Cosmology Research GroupJ. C. SuárezInstituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, SpainA TkachenkoKU LeuvenT WuKey Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, P.R. ChinaK ZwintzInstitut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, AustriaS Barceló FortezaDepartamento de Astrofísica, Centro de Astrobiología (CSIC-INTA), ESAC, Camino Bajo del Castillo s/n, E-28692 Madrid, SpainE BrunsdenDepartment of Physics, University of York, Heslington, York YO10 5DD, UKZ BognárKonkoly Observatory, CSFK, Konkoly Thege Miklós út 15-17, H-1121 Budapest, HungaryD L BuzasiDepartment of Chemistry and Physics, Florida Gulf Coast University, 10501 FGCU Blvd., Fort Myers, FL 33965, USAS ChowdhuryNicolaus Copernicus Astronomical Center, Bartycka 18, PL-00-716 Warsaw, PolandP De CatRoyal Observatory of Belgium, Ringlaan 3, B-1180 Brussel, BelgiumJ A EvansAstrophysics Group, Keele University, Staffordshire ST5 5BG, UKZ GuoNicolaus Copernicus Astronomical Center, Bartycka 18, PL-00-716 Warsaw, PolandJ A GuzikLos Alamos National Laboratory, MS T-082, Los Alamos, NM 87545, USAN JevticPhysics Department, Bloomsburg University, 200 E 2nd St, Bloomsburg, PA 17815, USAP LampensRoyal Observatory of Belgium, Ringlaan 3, B-1180 Brussel, BelgiumM Lares MartizInstituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, SpainC LovekinPhysics Department, Mount Allison University, Sackville, NB E4L 1E6, CanadaG LiSydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, AustraliaG M MirouhAstrophysics Research Group, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, UKD MkrtichianNational Astronomical Research Institue of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, ThailandM J P F G MonteiroInstituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, PortugalJ. M. NemecDepartment of Physics & Astronomy, Camosun College, Victoria, BC, CanadaR-M OuazzaniLaboratoire d’études spatiales et d’instrumentation en astrophysiqueJ. Pascual-GranadoInstituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, SpainD R ReeseUniversité Paris Sciences et LettresM RieutordUniversité Toulouse III - Paul SabatierJ R RodonInstituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, SpainMarek SkarkaDepartment of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech RepublicP SowickaNicolaus Copernicus Astronomical Center, Bartycka 18, PL-00-716 Warsaw, PolandI StatevaInstitute of Astronomy and NAO, Bulgarian Academy of Sciences, Blvd.Tsarigradsko Chaussee 72, Sofia 1784, BulgariaR. SzabóKonkoly Observatory, CSFK, Konkoly Thege Miklós út 15-17, H-1121 Budapest, HungaryW W WeissInstitute for Astrophysics, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria

2019en

ABI

Annotatsiya

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 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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DOI: 10.1093/mnras/stz2787

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