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Mode identification and period fitting in six pulsating hot subdwarfs

Published online by Cambridge University Press:  16 May 2024

S.K. Sahoo Open the ORCID record for S.K. Sahoo [Opens in a new window] ,
A.S. Baran ,
P. Németh ,
H.L. Worters ,
S. Pramod Kumar ,
S. Joshi  and
D. Kilkenny
S.K. Sahoo*
Affiliation:
Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences, Warsaw, Poland
A.S. Baran
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO, USA Astronomical Observatory, University of Warsaw, Warszawa, Poland
P. Németh
Affiliation:
Astroserver.org, Malomsok, Hungary Astronomical Institute of the Czech Academy of Sciences, Ondřejov, Czech Republic
H.L. Worters
Affiliation:
South African Astronomical Observatory, Cape Town, South Africa
S. Pramod Kumar
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore, India
S. Joshi
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital, India
D. Kilkenny
Affiliation:
Department of Physics and Astronomy, University of the Western Cape, Bellville, South Africa
*
Corresponding author: S.K. Sahoo; Email: sumanta.kumar27@gmail.com
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Abstract

We report the results of our analysis of six gravity-mode pulsating hot subdwarf stars observed in the short cadence mode by Transiting Exoplanet Survey Satellite. We detected at least 10 pulsation periods in each star, searched for multiplets, and used an asymptotic period spacing to identify modes. We used a grid of evolutionary and pulsation models calculated with the MESA and GYRE, along with spectroscopic parameters and modal degree identification, to derive the physical properties of the stars. We checked the relation between the helium content and pulsations and found that no pulsator exists among the extremely helium-rich hot subdwarfs, while the number of detected pulsators in other helium groups increases as the helium content decreases. We found p- and g-mode hot subdwarfs pulsators in all Galactic populations.

Keywords

Stars: subdwarfsstars: oscillations (including pulsations)asteroseismology
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 41 , 2024 , e041
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Astronomical Society of Australia

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