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J/A+A/496/223   PMS tracks at low Z for 0.1≤M≤1.5       (Di Criscienzo+, 2009)

Updated pre-main sequence tracks at low metallicities for 0.1≤M/M≤1.5. Di Criscienzo M., Ventura P., D'antona F. <Astron. Astrophys., 496, 223-227 (2009)> =2009A&A...496..223D
ADC_Keywords: Stars, pre-main sequence ; Models, evolutionary Keywords: stars: evolution - stars: pre-main sequence Abstract: While MLT-alpha2D models are not available for lower metallicities, we extend to lower Z the NEMO-FST models, under the hypothesis that in such a way we are simulating the results of MLT-alpha2D models also at smaller Z. We use standard stellar computation techniques in which the atmospheric boundary conditions are derived making use of model atmosphere grids. This allows us to take into account the non greyness of the atmosphere, but adds a new parameter to the stellar structure uncertainty, namely the efficiency of convection in the atmospheric structure, if convection is computed in the atmospheric grid by a model different to the model adopted for the interior integration. Description: We present pre-main-sequence (PMS) models for low mass stars from 0.1 to 1.5M_☉ for metallicities [Fe/H]=-0.5, -1.0 and -2.0. The calculations include the most recent interior physics and the latest generation of non-grey atmosphere models. At fixed luminosity more metal poor isochrones are hotter than solar ones by ΔlogTeff/ΔlogZ∼0.03-0.05 in the range in Z from 0.02 to 0.0002 and for ages from 105 to 107yr. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tracks.dat 51 3775 Evolutionary tracks iso.dat 34 108 Isochrones
See also: VI/109 : Population Synthesis Models at very low Z (Schaerer, 2003) VI/113 : Evolutionary models of Population II stars (Cariulo+, 2004) J/A+A/361/1023 : Evolution models for α-enhanced stars (Salasnich+ 2000) J/A+AS/141/371 : Low-mass stars evolutionary tracks+isochrones (Girardi+, 2000) J/A+A/484/815 : Scaled solar tracks and isochrones (Bertelli+, 2008) J/A+A/494/209 : Pre-main sequence evolutionary tracks (Landin+, 2009) Byte-by-byte Description of file: tracks.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Code [AH97 NEMO] Code used (1) 6- 11 F6.4 --- Z Initial metallicity (0.0002, 0.002 or 0.006) 13- 16 F4.2 solMass Mass Initial mass (from 0.1 to 1.5) 19- 27 F9.6 [yr] log(Age) Stellar age 31- 39 F9.6 [solLum] logL Luminosity 44- 51 F8.6 [K] log(Teff) Effective temperature
Note (1): Codes as follows: AH97 = MLT (Mixing Length Theory) non grey models based on the atmosphere structure by Allard & Hauschildt (1997, The NEXTGEN model grids,; used for low very low masses NEMO = FST (with CGM convection) non grey models based on ATLAS-9 grid by Heiter et al. (2002A&A...392..619H)
Byte-by-byte Description of file: iso.dat
Bytes Format Units Label Explanations
1- 6 F6.4 --- Z Isochone metallicity (0.0002, 0.002 or 0.006) 8- 11 E4.1 yr Age Isochone age (1e+5, 1e+6 or 1e+7) 15- 18 F4.2 solMass Mass Mass (from 0.1 to 1.5) 22- 26 F5.3 [K] log(Teff) Effective temperature 29- 34 F6.3 [solLum] logL Luminosity
History: Copied at
(End) Patricia Vannier [CDS] 18-May-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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