Discovery of new TESS pulsating hot subdwarfs
Abstract
Aims: This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches.
Methods: By matching catalogues of hot subdwarfs with TESS targets and using luminosities from Gaìa parallaxes, a list of 1389 candidate hot subdwarfs observed by TESS was created. The periodograms of these stars were inspected, and the stars were classified according to variability type.
Results: An updated catalogue of all known pulsating hot subdwarfs is presented. A number of probable pulsating binaries have been identified, which might prove useful for verifying the asteroseismic masses. The mean masses of p- and g-mode pulsators are estimated from the stellar parameters.
Conclusions: A list of 63 previously unknown pulsating hot subdwarfs observed by TESS is presented. More than half of the stars previously identified as pure p-mode pulsators are found to have frequencies in the g-mode region as well. As a result, hybrid p- and g-mode pulsators occur over the whole instability strip.
- Publication:
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Astronomy and Astrophysics
- Pub Date:
- July 2022
- DOI:
- 10.1051/0004-6361/202142860
- arXiv:
- arXiv:2204.01604
- Bibcode:
- 2022A&A...663A..45K
- Keywords:
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- subdwarfs;
- stars: oscillations;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- A&