Unveiling the power spectra of δ Scuti stars with TESS. The temperature, gravity, and frequency scaling relation

DOI: 
10.1051/0004-6361/201937262
Publication date: 
01/06/2020
Main author: 
Barceló Forteza, S.
IAA authors: 
Martín-Ruiz, S.;Suárez, J. C.;García Hernández, A.
Authors: 
Barceló Forteza, S.;Moya, A.;Barrado, D.;Solano, E.;Martín-Ruiz, S.;Suárez, J. C.;García Hernández, A.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
638
Pages: 
A59
Abstract: 
Thanks to high-precision photometric data legacy from space telescopes like CoRoT and Kepler, the scientific community could detect and characterize the power spectra of hundreds of thousands of stars. Using the scaling relations, it is possible to estimate masses and radii for solar-type pulsators. However, these stars are not the only kind of stellar objects that follow these rules: δ Scuti stars seem to be characterized with seismic indexes such as the large separation (∆ν). Thanks to long-duration high-cadence TESS light curves, we analysed more than two thousand of this kind of classical pulsators. In that way, we propose the frequency at maximum power (ν<SUB>max</SUB>) as a proper seismic index since it is directly related with the intrinsic temperature, mass and radius of the star. This parameter seems not to be affected by rotation, inclination, extinction or resonances, with the exception of the evolution of the stellar parameters. Furthermore, we can constrain rotation and inclination using the departure of temperature produced by the gravity-darkening effect. This is especially feasible for fast rotators as most of δ Scuti stars seem to be. <P />Tables A.1 and A.2 are only available at the CDS via anonymous ftp to <A href='http://cdsarc.u-strasbg.fr/'>http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href='http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/638/A59'>http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/638/A59</A>
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020A&A...638A..59B/abstract
ADS Bibcode: 
2020A&A...638A..59B
Keywords: 
asteroseismology;stars: oscillations;stars: variables: δ Scuti;Astrophysics - Solar and Stellar Astrophysics