2018MNRAS.479L..55N

2018MNRAS.479L..55N - Mon. Not. R. Astron. Soc., 479, L55-L59 (2018/September-1)

α Centauri A as a potential stellar model calibrator: establishing the nature of its core.

Understanding the physical process responsible for the transport of energy in the core of α Centauri A is of the utmost importance if this star is to be used in the calibration of stellar model physics. Adoption of different parallax measurements available in the literature results in differences in the interferometric radius constraints used in stellar modelling. Further, this is at the origin of the different dynamical mass measurements reported for this star. With the goal of reproducing the revised dynamical mass derived by Pourbaix & Boffin, we modelled the star using two stellar grids varying in the adopted nuclear reaction rates. Asteroseismic and spectroscopic observables were complemented with different interferometric radius constraints during the optimization procedure. Our findings show that best-fitting models reproducing the revised dynamical mass favour the existence of a convective core (>=70 per cent of best-fitting models), a result that is robust against changes to the model physics. If this mass is accurate, then α Centauri A may be used to calibrate stellar model parameters in the presence of a convective core.

Journal keyword(s): stars: a Centauri A - stars: fundamental parameters - stars: convection and radiation - method: asteroseismology

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	* alf Cen A	SB*	14 39 36.49400	-60 50 02.3737	0.96	0.72	0.01			G2V	1352	1

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`HD 128620`	`GCRV 8517`	`2MASS J14393592-6050069`	`SKY# 26645`
*` alf Cen A`**	`GEN# +1.00128620A`	`NAME Rigel Kentaurus`	`SPOCS 610`
*` alf01 Cen`**	`GJ 559 A`	`NAME Rigil Kentaurus`	`TD1 17606`
` RHD 1A`**	`HIC 71683`	`NLTT 37984`	`TIC 471011145`
`CCDM J14396-6050A`	`HIP 71683`	`PLX 3309`	`TYC 9007-5849-1`
`CD-60 5293A`	`HR 5459`	`PM 14362-6038A`	`WDS J14396-6050A`
`CNS5 3627`	`IDS 14328-6025 A`	`PMSC 14328-6025A`	`WEB 12354`
`CPD-60 5483A`	`LFT 1127`	`PPM 360911`	`Zkh 209`
`CSI-60 5483 41`	`LHS 50`	`SBC7 520`
`GALAH 140708001701306`	`LTT 5806`	`SBC9 815`

`HD 128620`	`CCDM J14396-6050A`	`GALAH 140708001701306`	`GJ 559 A`	`HIC 71683`
`HIP 71683`	`HR 5459`	`LHS 50`	`2MASS J14393592-6050069`	`NLTT 37984`
`PLX 3309`	`PPM 360911`	`TD1 17606`	`TYC 9007-5849-1`	`WDS J14396-6050A`