Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis

asteroseismology; stars: abundances; stars: fundamental parameters; stars: interiors; stars: solar-type; Astrophysics - Solar and Stellar Astrophysics

Abstract :

[en] Solar analogues are important stars to study for understanding the properties of the Sun. Combined with seismic and spectroscopic analysis, evolutionary modelling becomes a powerful method to characterize stellar intrinsic parameters, such as mass, radius, metallicity and age. However, these characteristics, relevant for other aspects of astrophysics or exoplanetary system physics, for example, are difficult to obtain with high precision and/or accuracy. The goal of this study is to characterize the two solar analogues, HD 42618 and HD 43587, observed by CoRoT. In particular, we aim to infer their precise mass, radius and age, using evolutionary modelling constrained by spectroscopic, photometric and seismic analysis. These stars show evidence of being older than the Sun but with a relatively large lithium abundance. We present the seismic analysis of HD 42618, and the modelling of the two solar analogues, HD 42618 and HD 43587 using the CESTAM stellar evolution code. Models were computed to reproduce the spectroscopic (effective temperature and metallicity) and seismic (mode frequency) data, and the luminosity of the stars, based on Gaia parallaxes. We infer very similar values of mass and radius for both stars compared with the literature, within the uncertainties, and we reproduce correctly the seismic constraints. The modelling shows that HD 42618 is slightly less massive and older than the Sun, and that HD 43587 is more massive and older than the Sun, in agreement with previous results. The use of chemical clocks improves the reliability of our age estimates.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Castro, M.; Departamento de Física, Universidade Federal do Rio Grande do Norte, CEP: 59072-970 Natal, RN, Brazil

Baudin, F.; Université Paris-Sud, CNRS, Institut d'Astrophysique Spatiale, UMR 8617, F-91405, Orsay Cedex, France

Benomar, O.; Center for Space Science, NYUAD Institute, New York University Abu Dhabi, PO Box 129188, Abu Dhabi, UAE ; Division of Solar and Plasma Astrophysics, NAOJ, Mitaka, Tokyo, Japan

Samadi, R.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, F-92195 Meudon, France

Morel, Thierry ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie

Barban, C.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, F-92195 Meudon, France

do Nascimento, J. D.; Departamento de Física, Universidade Federal do Rio Grande do Norte, CEP: 59072-970 Natal, RN, Brazil ; Université Paris-Sud, CNRS, Institut d'Astrophysique Spatiale, UMR 8617, F-91405, Orsay Cedex, France ; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA

Lebreton, Y.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, F-92195 Meudon, France ; Université Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France

Boumier, P.; Université Paris-Sud, CNRS, Institut d'Astrophysique Spatiale, UMR 8617, F-91405, Orsay Cedex, France

Marques, J. P.; Université Paris-Sud, CNRS, Institut d'Astrophysique Spatiale, UMR 8617, F-91405, Orsay Cedex, France

da Costa, J. S.; Escola de Ciência e Tecnologia, Universidade Federal do Rio Grande do Norte, CEP: 59072-970 Natal, RN, Brazil)

Language :

English

Title :

Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis

Publication date :

01 August 2021

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Oxford University Press, Oxford, United Kingdom

Volume :

505

Pages :

2151

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://ui.adsabs.harvard.edu/abs/2021MNRAS.505.2151C

Available on ORBi :

since 14 January 2022

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