Asteroseismology of the DAV star KUV 08368+4026

Author:

Yang Y H123,Chen Y H123ORCID,Tang M Y2ORCID

Affiliation:

1. Faculty of Science, Kunming University of Science and Technology , Kunming 650093, China

2. Institute of Astrophysics, Chuxiong Normal University , Chuxiong 675000, China

3. Center for gravitation and astrophysics, Kunming University of Science and Technology , Kunming 650500, China

Abstract

ABSTRACT As a DAV star, KUV 08368+4026 was observed by Li et al. in 2009 February, 2009 December, 2010 January, and 2012 February. They extracted 30 frequencies from the reported 300 h observation data and identified 17 independent modes. Based on the frequency splitting relationship, 6 l = 1 modes and 1 l = 2 mode are identified. The seven identified modes are reliable and can be used to constrain fitting models. A large sample (7,558,272) DAV star models were established using White Dwarf Evolution Code (wdec; 2018 version). The theoretical modes are calculated and used to fit the observed modes in order to obtain a best-fitting model. The best-fitting model has an average fitting error of σRMS  = 0.71 s. The best-fitting model parameters are M*  = 0.685 ± 0.005 M⊙, Teff  = 11820 ± 40 K, log(MHe/M*)  = − 5.00 ± 0.01, and, log(MH/M*)  = − 6.90 ± 0.01. The stellar mass M* and effective temperature Teff of the best-fitting model are basically consistent with the results of the spectroscopy. The mass of the He layer is thinner than the results obtained from previous asteroseismic models. The best-fitting model has a small Carbon/Oxygen central core with an oxygen abundance of XO  = 0.76. The asteroseismological distance calculated using the luminosity of our best-fitting model is basically consistent with that of the Kiso Schmidt ultraviolet excess survey.

Funder

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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