Query : 2012A&A...541A..41M

2012A&A...541A..41M - Astronomy and Astrophysics, volume 541A, 41-41 (2012/5-1)

Stellar mass and age determinations. I. Grids of stellar models from Z=0.006 to 0.04 and M=0.5 to 3.5 m.


Abstract (from CDS):

We present dense grids of stellar models suitable for comparison with observable quantities measured with great precision, such as those derived from binary systems or planet-hosting stars. We computed new Geneva models without rotation at metallicities Z=0.006, 0.01, 0.014, 0.02, 0.03, and 0.04 (i.e. [Fe/H] from -0.33 to +0.54) and with mass in small steps from 0.5 to 3.5M. Great care was taken in the procedure for interpolating between tracks in order to compute isochrones. Several properties of our grids are presented as a function of stellar mass and metallicity. Those include surface properties in the Hertzsprung-Russell diagram, internal properties including mean stellar density, sizes of the convective cores, and global asteroseismic properties. We checked our interpolation procedure and compared interpolated tracks with computed tracks. The deviations are less than 1% in radius and effective temperatures for most of the cases considered. We also checked that the present isochrones provide nice fits to four couples of observed detached binaries and to the observed sequences of the open clusters NGC 3532 and M67. Including atomic diffusion in our models with M<1.1M leads to variations in the surface abundances that should be taken into account when comparing with observational data of stars with measured metallicities. For that purpose, iso-Zsurf lines are computed. These can be requested for download from a dedicated web page, together with tracks at masses and metallicities within the limits covered by the grids. The validity of the relations linking Z and [Fe/H] is also re-assessed in light of the surface abundance variations in low-mass stars.

Abstract Copyright:

Journal keyword(s): stars: evolution - Hertzsprung-Russell and C-M diagrams - stars: fundamental parameters - stars: low-mass

VizieR on-line data: <Available at CDS (J/A+A/541/A41): models.dat grids/*>

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 V* V570 Per SB* 03 09 34.9441274976 +48 37 28.696544364   8.55 8.09     F5 50 0
2 V* CD Tau EB* 05 17 31.1530161432 +20 07 54.627762000 7.27 7.25 6.76     A5:IapHIwk: 161 0
3 V* HS Aur SB* 06 51 18.4766820936 +47 40 24.176766540   10.85 10.05     G5(N) 88 0
4 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2294 0
5 NGC 3532 OpC 11 05 40.1 -58 42 25           ~ 338 0
6 V* RW Lac SB* 22 44 57.1033105152 +49 39 27.512902116   11.23 10.81     F2 71 0

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