2006A&A...449..293E


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.07CEST21:06:15

2006A&A...449..293E - Astronomy and Astrophysics, volume 449, 293-303 (2006/4-1)

Modeling β Virginis using seismological data.

EGGENBERGER P. and CARRIER F.

Abstract (from CDS):

This paper presents the modeling of the F9 V star {beta} Virginis based on seismological measurements. Using the Geneva evolution code including rotation and atomic diffusion, we find that two distinct solutions reproduce all existing asteroseismic and non-asteroseismic observational constraints well: a main-sequence model with a mass of 1.28±0.03M and an age t=3.24±0.20Gyr, or a model in the post-main sequence phase of evolution with a lower mass of 1.21±0.02M and an age t=4.01±0.30Gyr. The small spacings δν02 and the ratio r02 between small and large spacings are sensitive to the differences in the structure of the central layers between these two solutions and are also sensitive to the structural changes due to the rotational mixing. They can therefore be used to unambiguously determine the evolutionary state of {beta} Vir and to study the effects of rotation on the inner structure of the star. Unfortunately, existing asteroseismic data do not enable such precise determination. We also show that the scatter in frequencies introduced by the rotational splittings can account for the larger dispersion of the observed large spacings for the non-radial modes than for the radial modes.

Abstract Copyright:

Journal keyword(s): stars: individual: β Virginis - stars: evolution - stars: oscillations

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1760 0
2 * ksi Hya ** 11 33 00.1150559 -31 51 27.443449 5.17 4.47 3.54 2.84 2.36 G7IIIb 231 0
3 * bet Vir PM* 11 50 41.7182390 +01 45 52.991019 4.26 4.15 3.60 3.13 2.85 F9V 856 0
4 * eta Boo SB* 13 54 41.07892 +18 23 51.7946 3.440 3.250 2.680 2.24 1.95 G0IV 656 1
5 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 896 1
6 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1139 0
7 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 466 2

    Equat.    Gal    SGal    Ecl

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2020.08.07-21:06:15

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