2011A&A...526A..35T


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET11:29:47

2011A&A...526A..35T - Astronomy and Astrophysics, volume 526A, 35-35 (2011/2-1)

Asteroseismic modelling of the metal-poor star τ Ceti.

TANG Y.K. and GAI N.

Abstract (from CDS):

Asteroseismology is an efficient tool not only for testing stellar structure and evolutionary theory but also constraining the parameters of stars for which solar-like oscillations are presently detected. As an important southern asteroseismic target τ Ceti, is a metal-poor star. The main features of the oscillations and some frequencies of τ Ceti have been identified. Many scientists propose to comprehensively observe this star as part of the Stellar Observations Network Group. Our goal is to obtain the optimal model and reliable fundamental parameters for the metal-poor star τ Ceti by combining all non-asteroseismic observations with these seismological data. Using the Yale stellar evolution code (YREC), a grid of stellar model candidates that fall within all the error boxes in the HR diagram have been constructed, and both the model frequencies and large- and small- frequency separations are calculated using the Guenther's stellar pulsation code. The χ2νc minimization is performed to identify the optimal modelling parameters that reproduce the observations within their errors. The frequency corrections of near-surface effects to the calculated frequencies using the empirical law, as proposed by Kjeldsen and coworkers, are applied to the models. We derive optimal models, corresponding to masses of about 0.775-0.785M and ages of about 8-10Gyr. Furthermore, we find that the quantities derived from the non-asteroseismic observations (effective temperature and luminosity) acquired spectroscopically are more accurate than those inferred from interferometry for τ Ceti, because our optimal models are in the error boxes B and C, which are derived from spectroscopy results.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: individual: τ Ceti - stars: oscillations - stars: low-mass

Simbad objects: 17

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Number of rows : 17

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 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 530 0
2 * tau Cet PM* 01 44 04.0834226 -15 56 14.926552 4.43 4.22 3.50 2.88 2.41 G8V 1066 1
3 * del Eri RS* 03 43 14.9008787 -09 45 48.208444 5.13 4.46 3.54 2.82 2.32 K0+IV 535 0
4 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 321 1
5 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1742 0
6 * bet Vir PM* 11 50 41.7182390 +01 45 52.991019 4.26 4.15 3.60 3.13 2.85 F9V 845 0
7 * eta Boo SB* 13 54 41.07892 +18 23 51.7946 3.440 3.250 2.680 2.24 1.95 G0IV 648 1
8 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 864 1
9 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1109 0
10 * eps Oph PM* 16 18 19.2897431 -04 41 33.034466 4.95 4.21 3.23 2.54 2.05 G9.5IIIbFe-0.5 222 0
11 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 458 2
12 * 70 Oph A PM* 18 05 27.370543 +02 29 59.31669       3.6   K0V 200 0
13 BD+48 2882 Ro* 19 21 24.640392 +48 30 53.31924   10.27 9.45 9.36   G1V 42 0
14 HD 181907 RG* 19 22 21.5484905118 -00 15 08.489087052   6.906 5.811     K1III 48 0
15 BD+41 3338 * 19 24 11.1934178701 +42 03 09.726580716   9.97 9.19     G8IV-V 53 0
16 TYC 3135-624-1 PM* 19 36 48.8136899967 +38 42 56.787490867   10.35 9.55     G5IV 55 0
17 * nu. Ind ** 22 24 36.8855638745 -72 15 19.494501994   5.94 5.29     G9VFe-3.1CH-1.5 241 0

    Equat.    Gal    SGal    Ecl

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2019.11.14-11:29:47

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