Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis. (arXiv:2008.01163v2 [astro-ph.SR] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Castro_M/0/1/0/all/0/1">M. Castro</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Baudin_F/0/1/0/all/0/1">F. Baudin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Benomar_O/0/1/0/all/0/1">O. Benomar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Samadi_R/0/1/0/all/0/1">R. Samadi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morel_T/0/1/0/all/0/1">T. Morel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barban_C/0/1/0/all/0/1">C. Barban</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nascimento_J/0/1/0/all/0/1">J. D. do Nascimento Jr.</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lebreton_Y/0/1/0/all/0/1">Y. Lebreton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boumier_P/0/1/0/all/0/1">P. Boumier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marques_J/0/1/0/all/0/1">J. P. Marques</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Costa_J/0/1/0/all/0/1">J. S. da Costa</a>
Solar analogues are important stars to study for understanding the properties
of the Sun. Evolutionary modeling, combined with seismic and spectroscopic
analysis, 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 a high precision
and/or accuracy. The goal of this study is to characterize the two solar
analogues HD42618 and HD43587, observed by CoRoT. In particular, we aim to
infer precise mass, radius, and age, using evolutionary modeling constrained by
spectroscopic, photometric, and seismic analysis. These stars show evidences of
being older than the Sun but with a relatively large lithium abundance. We
present the seismic analysis of HD42618, and the modeling of the two solar
analogs HD42618 andHD43587 using the CESTAM stellar evolution code. Models were
computed to reproduce the spectroscopic (effective temperature and metallicity)
and seismic (mode frequencies) data,and the luminosity of the stars, based on
Gaia parallaxes. We infer very similar values of mass and radius for both stars
compared to the literature, within the uncertainties, and reproduce correctly
the seismic constraints. For HD42618, the modeling shows it is slightly less
massive and older than the Sun. For HD43587, it confirms it 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.
Solar analogues are important stars to study for understanding the properties
of the Sun. Evolutionary modeling, combined with seismic and spectroscopic
analysis, 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 a high precision
and/or accuracy. The goal of this study is to characterize the two solar
analogues HD42618 and HD43587, observed by CoRoT. In particular, we aim to
infer precise mass, radius, and age, using evolutionary modeling constrained by
spectroscopic, photometric, and seismic analysis. These stars show evidences of
being older than the Sun but with a relatively large lithium abundance. We
present the seismic analysis of HD42618, and the modeling of the two solar
analogs HD42618 andHD43587 using the CESTAM stellar evolution code. Models were
computed to reproduce the spectroscopic (effective temperature and metallicity)
and seismic (mode frequencies) data,and the luminosity of the stars, based on
Gaia parallaxes. We infer very similar values of mass and radius for both stars
compared to the literature, within the uncertainties, and reproduce correctly
the seismic constraints. For HD42618, the modeling shows it is slightly less
massive and older than the Sun. For HD43587, it confirms it 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.
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