2022A&A...663A..92B


Query : 2022A&A...663A..92B

2022A&A...663A..92B - Astronomy and Astrophysics, volume 663A, 92-92 (2022/7-1)

Probing stellar cores from inversions of frequency separation ratios.

BETRISEY J. and BULDGEN G.

Abstract (from CDS):


Context. With the rapid development of asteroseismology thanks to space-based photometry missions such as CoRoT, Kepler, TESS, and in the future, PLATO, and the use of inversion techniques, quasi-model-independent constraints on the stellar properties can be extracted from a given stellar oscillation spectrum. In this context, inversions based on frequency separation ratios, which are less sensitive to surface effects, appear as a promising technique to constrain the properties of stellar convective cores.
Aims. We developed an inversion based on frequency separation ratios, with the goal of damping the surface effects of the oscillation frequencies. Using this new inversion, we defined a new indicator to constrain the boundary mixing properties of convective cores in solar-like oscillators.
Methods. We verified our inversion technique by conducting tests in a controlled environment, where the stellar mass and radius were known exactly, and conducted an extensive hare and hounds exercise.
Results. The inversion is not affected by surface effects. With the construction of an extensive set of models, favoured and forbidden regions can be highlighted in the parameter space. If the ratios are well fitted, unsurprisingly the inversion does not provide any additional information.
Conclusions. The indicator, coupled with the inversion based on frequency separation ratios, seems promising at probing the properties of convective cores, especially for F-type stars exhibiting solar-like oscillations.

Abstract Copyright: © J. Bétrisey and G. Buldgen 2022

Journal keyword(s): stars: interiors - stars: fundamental parameters - asteroseismology

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 TYC 3541-2345-1 * 19 02 09.8972932896 +45 16 39.357745608   10.90 10.21     G3V 45 0
2 HD 178688 * 19 07 43.5917202168 +41 56 15.730146420   9.48 9.02     F6IV 45 0
3 BD+43 3221 * 19 20 47.9392965792 +44 09 18.751522032   10.03 9.50     F9IV-V 77 0
4 BD+38 3583 Er* 19 25 40.3885404552 +38 40 20.413186860   10.73 10.00 9.853   G5V 117 0
5 HD 183298 PM* 19 26 22.0906256352 +50 59 14.334181836   8.71 8.16     G0.5IV 99 0
6 HD 190166 Er* 20 01 51.4248305136 +44 21 14.147515008   10.13 9.581 9.523   F8V 57 0

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