2010A&A...523A..54D


Query : 2010A&A...523A..54D

2010A&A...523A..54D - Astronomy and Astrophysics, volume 523, A54-54 (2010/11-2)

Core properties of α Centauri A using asteroseismology.

DE MEULENAER P., CARRIER F., MIGLIO A., BEDDING T.R., CAMPANTE T.L., EGGENBERGER P., KJELDSEN H. and MONTALBAN J.

Abstract (from CDS):

A set of long and nearly continuous observations of α Centauri A should allow us to derive an accurate set of asteroseismic constraints to compare to models, and make inferences on the internal structure of our closest stellar neighbour. We intend to improve the knowledge of the interior of α Centauri A by determining the nature of its core. We combined the radial velocity time series obtained in May 2001 with three spectrographs in Chile and Australia: CORALIE, UVES, and UCLES. The resulting combined time series has a length of 12.45 days and contains over 10000 data points and allows to greatly reduce the daily alias peaks in the power spectral window. We detected 44 frequencies that are in good overall agreement with previous studies, and found that 14 of these show possible rotational splittings. New values for the large (Δν) and small separations (δν02, δν13) have been derived. A comparison with stellar models indicates that the asteroseismic constraints determined in this study (namely r10 and δν13) allows us to set an upper limit to the amount of convective-core overshooting needed to model stars of mass and metallicity similar to those of α Cen A.

Abstract Copyright:

Journal keyword(s): stars: individual: α Cen A - stars: oscillations - stars: variables: general - stars: interiors

Simbad objects: 3

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Number of rows : 3
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 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 1011 2
2 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1265 1
3 * alf Cen ** 14 39 40.4 -60 50 20   0.4 -0.1     G2V+K1V 942 0

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2023.11.30-09:03:29

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