J/A+AS/141/371 Low-mass stars evolutionary tracks & isochrones (Girardi+, 2000) ================================================================================ Evolutionary tracks and isochrones for low- and intermediate-mass stars: From 0.15 to 7 M_{sun}_, and from Z=0.0004 to 0.03. Girardi L., Bressan A., Bertelli G., Chiosi C. =2000A&AS..141..371G ================================================================================ ADC_Keywords: Models, evolutionary ; Photometry, UBVRIJKLMNH ; Abundances ; Effective temperatures Mission_Name: Keywords: stars: evolution - stars: interiors - stars: Hertzsprung-Russell (HR) diagram - stars: low-mass Description: These files contain a large database of stellar models that are suitable to modelling star clusters and galaxies by means of population synthesis. They are based on a large grid of stellar evolutionary tracks for the initial chemical compositions [Z=0.0004, Y=0.23], [Z=0.001, Y=0.23], [Z=0.004, Y=0.24], [Z=0.008, Y=0.25], [Z=0.019, Y=0.273] (solar composition), and [Z=0.03, Y=0.30]. Tracks are computed with updated opacities and equation of state, and a moderate amount of convective overshoot. The range of initial masses goes from 0.15M_{sun}_ to 7M_{sun}_, and the evolutionary phases extend from the zero age main sequence (ZAMS) till either the thermally pulsing AGB regime or carbon ignition. We also present an additional set of models with solar composition, computed using the classical Schwarzschild's criterion for convective boundaries. From all these models, we derive: (1) Tables with the main quantities that characterize the stellar structure along the evolutionary tracks; (2) tables of surface chemical composition after the first and second dredge-up events; (3) extended theoretical isochrones in the Johnson-Cousins UBVRIJHK broad-band photometric system, together with summary tables; (4) integrated colours of single-burst stellar populations. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file mstracks.dat 173 13723 Evolutionary tracks main sequence from ZAMS on hbtracks.dat 173 4311 Evolutionary tracks horizontal branch from ZAHB surfcomp.dat 105 208 Surface chemical compositions isochron.dat 142 64381 Isochrones isochsum.dat 94 4251 Isochrones, summary table sspcolor.dat 80 350 Integrated Jonhson-Cousins broad-band colours of single-burst stellar populations (SSP) -------------------------------------------------------------------------------- See also: http://pleiadi.pd.astro.it : Padova database of stellar evolutionary tracks and isochrones J/A+AS/100/647 : Evolutionary Sequences II. (Bressan+ 1993) J/A+AS/104/365 : Evolutionary sequences III. (Fagotto+ 1994) J/A+AS/105/29 : Evolutionary sequences IV. (Fagotto+ 1994) J/A+AS/105/39 : Evolutionary sequences V. (Fagotto+ 1994) J/A+AS/117/113 : Evolutionary sequences VI. (Girardi+ 1996) J/A+AS/106/275 : Theoretical isochrones (Bertelli+ 1994) J/A+A/361/1023 : {alpha}-enhanced stars evolutionary tracks & isochrones (Salasnich+, 2000) Byte-by-byte Description of file: mstracks.dat hbtracks.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- Overshoot [0/1] 0: models without overshooting 1: models with overshooting 3- 6 F4.2 solMass Mass Initial star mass 8- 13 F6.4 --- Z Initial metallicity 15- 19 F5.3 --- Y Initial helium abundance 21- 31 E11.5 yr Age Stellar age 33- 38 F6.3 [solLum] logL logarithm of surface luminosity 41- 45 F5.3 [K] logTeff logarithm of effective temperature 47- 52 F6.3 [cm/s2] logg logarithm of surface gravity (in cgs units) 55- 59 F5.3 [K] logTc logarithm of central temperature 62- 66 F5.3 [g/cm3] logrho logarithm of central density (in cgs units) 69- 73 F5.3 --- XcYc Mass fraction of either hydrogen (up to the central H-exhaustion) or helium (later stages) in the stellar centre 75- 81 E7.2 --- XcC Mass fraction of carbon in the stellar centre 83- 89 E7.2 --- XcO Mass fraction of oxygen in the stellar centre 91- 96 F6.4 --- Qconv Fractional mass of the convective core 98-103 F6.4 --- Qdisc Fractional mass of the first mesh point where the chemical composition differs from the surface value 105-110 F6.3 [solLum] logLH logarithm of the total luminosity provided by H-burning reactions 112-117 F6.4 --- Q1H Fractionary mass of the inner boundary of the H-rich region 119-124 F6.4 --- Q2H Fractionary mass of the outer boundary of the H-burning region 126-131 F6.3 [solLum] logLHe logarithm of the total luminosity provided by He-burning reactions (2) 133-138 F6.4 --- Q1He Fractionary mass of the inner boundary of the He-burning region 140-145 F6.4 --- Q2He Fractionary mass of the outer boundary of the He-burning region 148-152 F5.3 [solLum] logLC logarithm of the total luminosity provided by C-burning reactions (2) 154-159 F6.3 [solLum] logLnu logarithm of the total luminosity lost by neutrinos (2) 162-167 F6.4 --- QTmax Fractionary mass of the point with the highest temperature inside the star 170-173 A4 --- Stage Label indicating particular evolutionary stages (see the paper for details) (G1) -------------------------------------------------------------------------------- Note (2): a null value indicates negligible energy generation by those reactions -------------------------------------------------------------------------------- Byte-by-byte Description of file: surfcomp.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- Overshoot [0/1] 0: models without overshooting 1: models with overshooting 3- 8 F6.4 --- Zini Initial metallicity 10- 14 F5.3 --- Yini Initial helium abundance 16 A1 --- Stage [1a2] Stage : a: all 1: first dredge-up 2: second dredge-up 18- 21 F4.2 solMass Mass ? Mass (undefined for all stage) 23- 27 F5.3 --- H Mass fraction of H 29- 36 E8.2 --- 3He Mass fraction of ^3^He 38- 42 F5.3 --- 4He Mass fraction of ^4^He 44- 51 E8.2 --- 12C Mass fraction of ^12^C 53- 60 E8.2 --- 13C Mass fraction of ^13^C 62- 69 E8.2 --- 14N Mass fraction of ^14^N 71- 78 E8.2 --- 15N Mass fraction of ^15^N 80- 87 E8.2 --- 16O Mass fraction of 16^O^ 89- 96 E8.2 --- 17O Mass fraction of ^17^O 98-105 E8.2 --- 18O Mass fraction of ^18^O -------------------------------------------------------------------------------- Byte-by-byte Description of file: isochron.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- Overshoot [0/1] 0: models without overshooting 1: models with overshooting 3- 9 F7.5 --- Z Exact metallicity value of the isochrone 11- 19 E9.3 yr age Exact age value of the isochrone 21- 25 F5.2 [yr] log(age) logarithm of age 27- 36 F10.8 solMass Mini Initial mass of the star 38- 43 F6.4 solMass Mact Actual mass of the star, i.e., the mass obtained considering the previous history of mass-loss 45- 51 F7.4 [solLum] logL logarithm of surface luminosity 53- 58 F6.4 [K] logTeff logarithm of effective temperature 60- 66 F7.4 [cm/s2] logg logarithm of surface gravity 68- 73 F6.3 mag Mbol Absolute bolometric magnitude 75- 80 F6.3 mag UMAG Absolute magnitude in Johnson U pass-band 82- 87 F6.3 mag BMAG Absolute magnitude in Johnson B pass-band 89- 94 F6.3 mag VMAG Absolute magnitude in Johnson V pass-band 96-101 F6.3 mag RMAG Absolute magnitude in Cousins R pass-band 103-108 F6.3 mag IMAG Absolute magnitude in Cousins I pass-band 110-115 F6.3 mag JMAG Absolute magnitude in Johnson J pass-band 117-122 F6.3 mag HMAG Absolute magnitude in Johnson H pass-band 124-130 F7.3 mag KMAG Absolute magnitude in Johnson K pass-band 132-142 F11.8 --- FLUM Indefinite integral of the Salpeter IMF by number (1) -------------------------------------------------------------------------------- Note (1): For the case of the Salpeter IMF, {phi}(M)=AM^-{alpha}, with {alpha}=2.35. When we assume a normalization constant of A=1, FLUM is simply given by FLUM = M^1-{alpha}/(1-{alpha}. -------------------------------------------------------------------------------- Byte-by-byte Description of file: isochsum.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- Overshoot [0-1] 0: models without overshooting 1: models with overshooting 3- 9 F7.5 --- Z Exact metallicity value of the isochrone 11- 19 E9.3 yr age Exact age value of the isochrone 21- 25 F5.2 [yr] log(age) logarithm of age 27- 32 F6.4 solMass Mini Initial mass of the star 34- 38 F5.3 solMass Mact Actual mass of the star, i.e., the mass obtained considering the previous history of mass-loss 40- 44 F5.3 [solLum] logL logarithm of surface luminosity 46- 50 F5.3 [K] logTeff logarithm of effective temperature 52- 56 F5.2 [cm/s2] logg logarithm of surface gravity 58- 63 F6.3 mag VMAG Absolute magnitude in the V pass-band 65- 70 F6.3 mag U-B U-B colour index (Johnson) 72- 77 F6.3 mag B-V B-V colour index (Johnson) 79- 84 F6.3 mag V-I V-I colour index (Cousins) 86- 89 A4 --- Stage Stage along the isochrone (G1) -------------------------------------------------------------------------------- Byte-by-byte Description of file: sspcolor.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- Overshoot [0/1] 0: models without overshooting 1: models with overshooting 3- 8 F6.4 --- Zini Initial metalicity 10- 14 F5.3 --- Yini Helium initial abundance 16- 23 E8.2 yr Age Age 25- 29 F5.3 mag VMAG Absolute V magnitude 31- 36 F6.3 mag B-V B-V colour index (Johnson) 38- 43 F6.3 mag U-B U-B colour index (Johnson) 45- 50 F6.3 mag BC Bolometric correction 52- 56 F5.3 mag V-R V-R colour index (Cousins) 58- 62 F5.3 mag V-I V-I colour index (Cousins) 64- 68 F5.3 mag V-J V-J colour index (Johnson) 70- 74 F5.3 mag V-H V-H colour index (Johnson) 76- 80 F5.3 mag V-K V-K colour index (Johnson) -------------------------------------------------------------------------------- Global notes: Note (G1): Particular evolutionary stages: ZAMS: initial evolutionary stage ZAHB: initial evolutionary stage Te-M: local maxima of Teff Te-m: local minima of Teff L-M: local maxima of L L-m: local minima of L Xc=0: exhaustion of central hydrogen Yc=0: exhaustion of central helium Bhe: highest Teff during the He-burning of intermediate-mass star LpT: lowest L during the He-burning of intermediate-mass star Brg: base of the first ascent of the red giant branch Tip: tip of the first ascent of the red giant branch 1tp: maximum L immediately preceding a thermal pulse 1TP: beginning of the thermally pulsing AGB phase Cb: stage of C-ignition in the cases the AGB phase do not occur AGBt: end of AGB phase BHeb: begin of the core helium burning phase EHeb: end of the core helium burning phase RGBb: base of the RGB RGBt: tip of RGB phase TO: turn-off point, i.e. the point of highest Teff during the core-H burning phase F: Final model -------------------------------------------------------------------------------- Acknowledgements: Leo Girardi History: An updated version of this database, containing extensions and a lot of additional data, is being kept at the URL http://pleiadi.pd.astro.it ================================================================================ (End) Patricia Bauer [CDS] 28-Nov-2000