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Accepted manuscript

Mode identification and period fitting in six pulsating hot subdwarfs

Published online by Cambridge University Press:  16 May 2024

S.K. Sahoo*
Affiliation:
Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland
A. S. Baran
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO65897, USA Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
P. Németh
Affiliation:
Astroserver.org, Fő ter 1, 8533 Malomsok, Hungary Astronomical Institute of the Czech Academy of Sciences, Fričova 298, CZ-251 65 Ondřejov, Czech Republic
H. L. Worters
Affiliation:
South African Astronomical Observatory, Observatory 7935, South Africa
S. Pramod Kumar
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
S. Joshi
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital-263002, India
D. Kilkenny
Affiliation:
Department of Physics and Astronomy, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
*
Author for correspondence: S.K. Sahoo, Email: sumanta.kumar27@gmail.com

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.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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