Evolutionary models for UCDs

For details, see the manuscript at doi = "10.3847/1538-4357/ab2333" , published at The Astrophysical Journal, 2019, July 10.

We present a grid of stellar evolutionary models for UCDs computed with the CLES code. This grid is available for Asplund et al. (2009) solar mixture. CLES includes different choices for EOS, opacity and atmosphere tables. For details on the input physics for UCDs, see the manuscript.

Evolutionary model grid for UCDs is presented for:

Stellar mass ranging from 0.055 to 0.130 M_☉ (in steps of 0.005 M_☉ or 0.010 M_☉ when lower or above than 0.100 M_☉, respectively);
The hydrogen (X) and metals (Z) mass fraction are defined by the set: helium mass fraction (Y) and metallicity [Fe/H] (e.g., solar: Y=0.258 and [Fe/H] = +0.0);
The boundary condition (BC) is defined from detailed model atmosphere (atmos: BT-Settl or COMARCS). The models are available for effective temperatures above 2000K and 2600K for the BT-Settl or the COMARCS models, repectively;
The resulting evolution at the same age for different objects (isochrones) and evolution steps for each stellar mass (iso-mass) are presented for the combination: (atmos, Y, [Fe/H]).

See header for details. The physical parameters (column number) at each time-step is presented as follows: mass (1), age (2), log(T_eff) (3), log(L/L_☉) (4), X_c (5), T_c (6), logg (7), R/R_☉ (8), Li/Li₀ (7)

Filename structure: [type]_[BC]_[helium abundance (Y)][metallicity ([Fe/H])].csv
For the evolution per mass [type = "e"], see example here for the resulting evolutionary models for the different stellar mass for BT-Settl [BC = "BTs"] at solar abundance [Y = "0.258"] and [metallicity = "+0.00"];
For the isochrones [type = "i"], see example here for the resulting evolution at the same age (between 1Myr and 10Gyr) for different stellar masses, and for BT-Settl as BC with "0.258" helium abundance, and "+0.10" metallicity.

UCD grid with:

Please write us if you need models between the grid points.

This grid was computed with Software: Cles (version 19.1, updated: 2019-06-12). Scuflaire, R., Theado, S., Montalban, J., et al. 2008, Ap&SS, 316, 83

News

03-June-2020: isochrone grid complete with atmosphere model BT-Settl as BC (see isochrones with BT-Settl as BC )
13-April-2020: started to include isochrones-grid (see isochrones with COMARCS as BC )
16-January-2020: started to include isochrones-grid (see isochrones with BT-Settl as BC )
14-June-2019: new tables are now available with fixed typo for logg (column 7)

Last update: April, 30 - 2020

Please address any questions and remarks to: c.fernandes (at) uliege.be