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J/A+A/361/1023 Evolution models for α-enhanced stars (Salasnich+ 2000)
Evolutionary tracks and isochrones for α-enhanced stars. Salasnich B., Girardi L., Weiss A., Chiosi C. <Astron. Astrophys., 361, 1023 (2000)> =2000A&A...361.1023S
ADC_Keywords: Models, evolutionary ; Photometry, UBVRIJKLMNH ; Abundances ; Effective temperatures Keywords: stars: evolution - stars: interiors - stars: Hertzsprung-Russel (HR) and C-M diagrams Abstract: We present four large sets of evolutionary tracks for stars with initial chemical compositions [Y=0.250, Z=0.008], [Y=0.2773, Z=0.019], [Y=0.320, Z=0.040] and [Y=0.390, Z=0.070] and enhancement of α elements with respect to the solar pattern. The major improvement with respect to previous similar calculations is that we use consistent opacities - i.e. computed with the same chemical composition as adopted in the stellar models - over the whole relevant range of temperatures. For the same initial chemical compositions [Y, Z] and otherwise identical input physics we present also new evolutionary sequences with solar-scaled mixtures of abundances. Based on these stellar models we calculate the corresponding sets of isochrones both in the Johnson-Cousins UBVRIJHK and HST/WFPC2 photometric systems. Furthermore, we derive integrated magnitudes, colours and mass-to-light ratios for ideal single stellar populations with total mass equal to 1M☉ Finally, the major changes in the tracks, isochrones, and integrated magnitudes and colours passing from solar-scaled to α-enhanced mixtures are briefly outlined. Retrieval of the complete data set is possible via the www page http://pleiadi.pd.astro.it . File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file mstracks.dat 186 19869 Tracks computed from the ZAMS on hbtracks.dat 186 5732 Tracks evolved from the ZAHB on isostmag.dat 172 87660 Isochrones in the HST/WFPC2 STMAG system isovega.dat 171 87660 Isochrones in the HST/WFPC2 VEGAMAG system isojcmag.dat 145 87660 Isochrones in the Johnson-Cousins system sspstmag.dat 108 536 Integrated magnitudes in the HST/WFPC2 STMAG system sspvega.dat 108 536 Integrated magnitudes in the HST/WFPC2 VEGAMAG system sspjcmag.dat 87 536 Integrated colours in the Johnson-Cousins system
See also: J/A+A/311/361 : Evolution models of elliptical galaxies. II. (Tantalo+, 1996) J/A+A/335/823 : Evolution models of elliptical galaxies. III. (Tantalo+ 1998) 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+AS/141/371 : Low-mass stars evolutionary tracks+isochrones (Girardi+, 2000) Byte-by-byte Description of file: mstracks.dat hbtracks.dat
Bytes Format Units Label Explanations
1 A1 --- flag [as] a: alpha-enhanced, s: solar-scaled 3- 7 F5.2 solMass Mass Initial star mass 9- 13 F5.3 --- Z Initial metallicity 15- 19 F5.3 --- Y Initial helium abundance 22- 32 E11.5 yr Age Stellar age 34- 39 F6.3 [solLum] logL logarithm of surface luminosity 42- 46 F5.3 [K] logTeff logarithm of effective temperature 48- 53 F6.3 [cm/s2] logg logarithm of surface gravity (in cgs units) 56- 60 F5.3 [K] logTc logarithm of central temperature 63- 67 F5.3 [g/cm3] logrho logarithm of central density (in cgs units) 70- 74 F5.3 --- XcYc Mass fraction of either hydrogen (up to the central H-exhaustion) or helium (later stages) in the stellar centre 76- 82 E7.2 --- XcC Mass fraction of carbon in the stellar centre 84- 90 E7.2 --- XcO Mass fraction of oxygen in the stellar centre 92- 97 F6.4 --- Qconv Fractional mass of the convective core 99-104 F6.4 --- Qdisc Fractional mass of the first mesh point where the chemical composition differs from the surface value 106-111 F6.3 [solLum] logLH logarithm of the total luminosity provided by H-burning reactions 113-118 F6.4 --- Q1H Fractionary mass of the inner boundary of the H-rich region 120-125 F6.4 --- Q2H Fractionary mass of the outer boundary of the H-burning region 127-132 F6.3 [solLum] logLHe logarithm of the total luminosity provided by He-burning reactions (2) 134-139 F6.4 --- Q1He Fractionary mass of the inner boundary of the He-burning region 141-146 F6.4 --- Q2He Fractionary mass of the outer boundary of the He-burning region 149-153 F5.3 [solLum] logLC logarithm of the total luminosity provided by C-burning reactions (2) 155-160 F6.3 [solLum] logLnu logarithm of the total luminosity lost by neutrinos (2) 163-168 F6.4 --- QTmax Fractionary mass of the point with the highest temperature inside the star 171-178 A8 --- 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: isostmag.dat isovega.dat
Bytes Format Units Label Explanations
1 A1 --- flag [as] (a: alpha-enhanced, s: solar-scaled) 3- 9 F7.5 --- Z Metallicity 11- 19 E9.3 yr Age Age 21- 25 F5.2 [yr] log(Age) logarithm of the age 27- 37 F11.8 solMass Mini Initial mass of the star 39- 45 F7.4 solMass Mact Actual mass of the star (1) 47- 53 F7.4 solLum logL logarithm of surface luminosity 55- 60 F6.4 [K] logTe logarithm of effective temperature 62- 68 F7.4 [cm/s2] logG logarithm of surface gravity 70- 75 F6.3 mag Mbol Absolute bolometric magnitude 77- 82 F6.3 mag f170w Absolute magnitude in the F170W pass-band 84- 89 F6.3 mag f218w Absolute magnitude in the F218W pass-band 91- 96 F6.3 mag f255w Absolute magnitude in the F255W pass-band 98-103 F6.3 mag f300w Absolute magnitude in the F300W pass-band 105-110 F6.3 mag f336w Absolute magnitude in the F336W pass-band 112-117 F6.3 mag f439w Absolute magnitude in the F439W pass-band 119-124 F6.3 mag f450w Absolute magnitude in the F450W pass-band 126-131 F6.3 mag f555w Absolute magnitude in the F555W pass-band 133-138 F6.3 mag f606w Absolute magnitude in the F606W pass-band 140-145 F6.3 mag f702w Absolute magnitude in the F702W pass-band 147-152 F6.3 mag f814w Absolute magnitude in the F814W pass-band 154-159 F6.3 mag f850lw Absolute magnitude in the F850LW pass-band 161-171 F11.8 --- Flum Indefinite integral of the Salpeter IMF by number (see the paper for more details)
Note (1): i.e., the mass obtained considering the previous history of mass-loss
Byte-by-byte Description of file: isojcmag.dat
Bytes Format Units Label Explanations
1 A1 --- flag [as] (a: alpha-enhanced, s: solar-scaled) 3- 9 F7.5 --- Z Metallicity 11- 19 E9.3 yr Age Age 21- 25 F5.2 [yr] log(Age) logarithm of the age 27- 37 F11.8 solMass Mini Initial mass of the star 39- 45 F7.4 solMass Mact Actual mass of the star (1) 47- 53 F7.4 solLum logL logarithm of surface luminosity 55- 60 F6.4 [K] logTe logarithm of effective temperature 62- 68 F7.4 [cm/s2] logG logarithm of surface gravity 70- 75 F6.3 mag Mbol Absolute bolometric magnitude 77- 82 F6.3 mag UMag Absolute magnitude in the U pass-band 84- 89 F6.3 mag BMag Absolute magnitude in the B pass-band 91- 96 F6.3 mag VMag Absolute magnitude in the V pass-band 98-103 F6.3 mag RMag Absolute magnitude in the R pass-band (Cousins) 105-110 F6.3 mag IMag Absolute magnitude in the I pass-band (Cousins) 112-117 F6.3 mag JMag Absolute magnitude in the J pass-band 119-125 F7.3 mag HMag Absolute magnitude in the H pass-band 127-133 F7.3 mag KMag Absolute magnitude in the K pass-band 135-145 F11.8 --- Flum Indefinite integral of the Salpeter IMF by number (see the paper for more details)
Note (1): i.e., the mass obtained considering the previous history of mass-loss
Byte-by-byte Description of file: sspstmag.dat sspvega.dat
Bytes Format Units Label Explanations
1 A1 --- flag [as] (a: alpha-enhanced, s: solar-scaled) 3- 8 F6.4 --- Z Metallicity 10- 17 E8.2 yr Age Age 19- 24 F6.3 mag Mbol Integrated bolometric magnitude (G2) 26- 31 F6.3 mag f170w Integrated magnitude in the F170W pass-band (G2) 33- 38 F6.3 mag f218w Integrated magnitude in the F218W pass-band (G2) 40- 45 F6.3 mag f255w Integrated magnitude in the F255W pass-band (G2) 47- 52 F6.3 mag f300w Integrated magnitude in the F300W pass-band (G2) 54- 59 F6.3 mag f336w Integrated magnitude in the F336W pass-band (G2) 61- 66 F6.3 mag f439w Integrated magnitude in the F439W pass-band (G2) 68- 73 F6.3 mag f450w Integrated magnitude in the F450W pass-band (G2) 75- 80 F6.3 mag f555w Integrated magnitude in the F555W pass-band (G2) 82- 87 F6.3 mag f606w Integrated magnitude in the F606W pass-band (G2) 89- 94 F6.3 mag f702w Integrated magnitude in the F702W pass-band (G2) 96-101 F6.3 mag f814w Integrated magnitude in the F814W pass-band (G2) 103-108 F6.3 mag f850lw Integrated magnitude in the F850LW pass-band (G2)
Byte-by-byte Description of file: sspjcmag.dat
Bytes Format Units Label Explanations
1 A1 --- flag [as] a: alpha-enhanced, s: solar-scaled 3- 8 F6.4 --- Z Metallicity 10- 17 E8.2 yr Age Age 19- 23 F5.3 solMass Mtot Total mass 25- 30 F6.3 --- M/Lv Mass-to-light ratio 32- 36 F5.3 mag Mv Integrated absolute V magnitude (G2) 38- 43 F6.3 mag B-V Integrated B-V colour index (G2) 45- 50 F6.3 mag U-B Integrated U-B colour index (G2) 52- 57 F6.3 mag BC Bolometric correction 59- 63 F5.3 mag V-R Integrated V-R colour index (G2) 65- 69 F5.3 mag V-I Integrated V-I colour index (G2) 71- 75 F5.3 mag V-J Integrated V-J colour index (G2) 77- 81 F5.3 mag V-H Integrated V-H colour index (G2) 83- 87 F5.3 mag V-K Integrated V-K colour index (G2)
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 Note (G2): The integrated colours or magnitudes are tabulated as a function of age. They are computed assuming a simple Salpeter IMF normalized to 1M☉, and with a low-mass cutoff such as to reproduce a mass-to-light ratio of M/L_V=0.19 at an age of 10^8yr, for the Z=0.008 solar-scaled case. Therefore, they represent the luminosity evolution of SSPs of initial mass equal to 1M☉. See the paper for more details.
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
| 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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