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J/A+A/404/661 Fe5270, Fe5335, Mgb and Mg2 synthetic indices (Barbuy+, 2003)
A grid of synthetic spectra and indices Fe5270, Fe5335, Mgb and Mg2 as a function of stellar parameters and [alpha/Fe]. Barbuy B., Perrin M.-N., Katz D., Coelho P., Cayrel R., Spite M., van't Veer Menneret C. <Astron. Astrophys. 404, 661 (2003)> =2003A&A...404..661B
ADC_Keywords: Models, atmosphere ; Abundances, peculiar Keywords: stars: abundances Description: We have computed a grid of synthetic spectra in the wavelength range λλ4600-5600Å using revised model atmospheres, for a range of atmospheric parameters and values of [alpha-elements/Fe]=0.0 and +0.4. The Lick indices Fe5270, Fe5335, Mgb and Mg2 are measured on the grid spectra, for FWHM=2 to 8.3Å. Relations between the indices Fe5270, Fe5335 and Mg2 and stellar parameters effective temperature Teff, logg, [Fe/H] and [alpha/Fe], valid in the range 4000K≥Teff≥7000K, are presented. These fitting functions are given for FWHM=3.5 and 8.3Å. The indices were also measured for a list of 97 reference stars with well-known stellar parameters observed at ESO and OHP, and these are compared to the computed indices. Finally, a comparison of the indices measured on the observed spectra and those derived from the fitting functions based on synthetic spectra is presented. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 84 92 Star positions and magnitudes (from Simbad) tablea1.dat 83 13 Fitting function coefficients for Mg2(1994), computed with FWHM = 8.3Å, valid for -2.5<[Fe/H]<0.3 tablea2.dat 83 13 Fitting function coefficients for Fe5270(1994) computed with FWHM = 8.3Å, valid for -3<[Fe/H]<0.3 (exponential form) tablea3.dat 84 13 Fitting function coefficients for Fe5335(1994) computed with FWHM = 8.3Å, valid for -3<[Fe/H]<0.3 (exponential form) tablea4.dat 84 13 Fitting function coefficients for Mg2(1994) computed with FWHM = 3.5Å, valid for -2.5<[Fe/H]<0.3 tablea5.dat 84 13 Fitting function coefficients for Fe5270(1994) computed with FWHM = 3.5Å, valid for -3<[Fe/H]<0.3 (exponential form) tablea6.dat 83 13 Fitting function coefficients for Fe5335(1994) computed with FWHM = 3.5Å, valid for -3<[Fe/H]<0.3 (exponential form) tablea7.dat 27 3 Calibration constants to the fitting functions tableb1.dat 86 44 Reference stars observed at a resolution of FWHM approx 3.0Å at the OHP, from Cayrel et al. (1991A&A...247..108C) and Perrin et al. (1995A&A...298..107P) tableb2.dat 86 22 Reference stars observed at a resolution of FWHM approx 4.7Å at ESO, form Cayrel et al. (1991A&A...247..108C) and Perrin et al. (1995A&A...298..107P) tableb3.dat 87 45 Reference stars observed at a resolution of FWHM approx 3.5Åat the OHP in 1995-1997 (Katz, 2000, Ph.D. Thesis, Universite de Paris VII)
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name 14- 36 A23 --- SName Simbad name 38- 39 I2 h RAh ? Right ascension (J2000.0) 41- 42 I2 min RAm ? Right ascension (J2000.0) 44- 47 F4.1 s RAs ? Right ascension (J2000.0) 49 A1 --- DE- Declination sign (J2000.0) 50- 51 I2 deg DEd ? Declination (J2000.0) 53- 54 I2 arcmin DEm ? Declination (J2000.0) 56- 57 I2 arcsec DEs ? Declination (J2000.0) 61- 65 F5.2 mag Bmag ? B magnitude 67- 71 F5.2 mag Vmag ? V magnitude 73- 84 A12 --- SpType Spectral type
Byte-by-byte Description of file: tablea1.dat tablea4.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Ion Ion designation (Mg2) 8- 10 F3.1 0.1nm FWHM FWHM 12- 15 F4.1 [Sun] [Fe/H]inf Lower value of validity interval of metallicity 17- 19 F3.1 [Sun] [Fe/H]sup Upper value of validity interval of metallicity 21 A1 --- Coeff Coefficient symbol 24- 46 A23 --- n_Coeff Description of the terms 48- 54 F7.4 --- Value1 Coefficients valid in the range 4000<T<5000, 0<logg<2.5, -2.5≤[Fe/H]≤0.3, no exponential form 56- 64 F9.4 --- Value2 Coefficients (exponential form) valid in the range 5000<T<7000, 0≤logg≤2.5, -2.5≤[Fe/H]≤0.3 66- 73 F8.4 --- Value3 Coefficients valid in the range 4000<T<5000, 2.5<logg<5.0, -2.5≤[Fe/H]≤0.3, no exponential 76- 83 F8.4 --- Value4 Coefficients (exponential form) valid in the range 5000<T<7000, 2.5<logg<5.0, -2.5≤[Fe/H]≤0.3
Byte-by-byte Description of file: tablea[23].dat tablea[56].dat
Bytes Format Units Label Explanations
1- 6 A6 --- Ion Ion designation (Fe5270 or Fe5335) 8- 10 F3.1 0.1nm FWHM FWHM 12- 15 F4.1 [Sun] [Fe/H]inf Lower value of validity interval of metallicity 17- 19 F3.1 [Sun] [Fe/H]sup Upper value of validity interval of metallicity 21 A1 --- Coeff Coefficient symbol 24- 46 A23 --- n_Coeff Description of the terms 48- 54 F7.4 --- Value1 Coefficients (exponential form) valid in the range 4000≤T≤7000, 0≤logg<3.0, -3.0≤[Fe/H]≤0.3 56- 64 F9.4 --- Value2 Coefficients (exponential form) valid in the range 4000≤T≤4500, 3.0≤logg≤5.0, -3.0≤[Fe/H]≤0.3 66- 73 F8.4 --- Value3 Coefficients (exponential form) valid in the range 4500<T<6250, 3.0≤logg≤5.0 -3.0≤[Fe/H]≤0.3 76- 83 F8.4 --- Value4 Coefficients (exponential form) valid in the range 6250≤T≤7000, 3.0≤logg≤5.0, -3.0≤[Fe/H]≤0.3
Byte-by-byte Description of file: tablea7.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Ion Ion 10- 16 F7.4 --- CalLick Calibration constant to Lick system (FWHM=8.3Å) 21- 27 F7.4 --- CalFlux Calibration constant to flux calibrated data at FWHM=3.5Å
Table A.7: Calibration constants to the fitting functions. ------------------------------------------------------------------------------- Calibration constant to Ion Lick system (FWHM=8.3Å) flux calibrated data at FWHM=3.5Å ------------------------------------------------------------------------------- Mg2 0.0224 -0.0078 Fe5270 0.0723 -0.1624 Fe5335 -0.2692 -0.3817 Byte-by-byte Description of file: tableb1.dat tableb2.dat tableb3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name (1) 12- 16 F5.2 mag Vmag V magnitude 18- 21 F4.2 mag B-V ? B-V colour index (not in tableb3.dat) 23- 26 I4 K Teff Effective temperature 28- 31 F4.2 [cm/s2] logg Gravity 33- 37 F5.2 [Sun] [Fe/H] Metallicity 39- 43 F5.3 mag Fe5270-1 Measured Fe5270 index (1984 definition) 45- 49 F5.3 mag Fe5270-2 Measured Fe5270 index (1994 definition) 51- 55 F5.3 mag Fe5335-1 Measured Fe5335 index (1984 definition) 57- 61 F5.3 mag Fe5335-2 Measured Fe5335 index (1994 definition) 63- 67 F5.3 mag Mgb-1 Measured Mgb index (1984 definition) 69- 73 F5.3 mag Mgb-2 Measured Mgb index (1994 definition) 75- 79 F5.3 mag Mg2-1 ? Measured Mg2 index (1984 definition) 81- 85 F5.3 mag Mg2-2 ? Measured Mg2 index (1994 definition)
Note (1): the names are: In tableb1.dat: M5II-NN = Cl* NGC 5904 ArpH II-NNN, Arp 1955AJ.....60..317A M71 1 and M71 87 = NGC 6838 1001 and NGC 6838 1087 Identification numbers for M67 are from Montgomery et al. (1993AJ....106..181M). M67 FNNN = NGC 2682 NNN, M67 IV-77 = Cl* NGC 2682 ES IV-77 M67 III-34 = Cl* NGC 2682 ES III-34, M67 II-22 = Cl* NGC 2682 ES II-22 In tableb2.dat: The identification numbers are from Lee (1977A&AS...27..381L), for 47 Tuc Alcaino (1970ApJ...159..325A) for NGC 6752 Alcaino & Liller (1980AJ.....85.1330A) for M30 Simbad nomenclature: 47TucNNNN = Cl* NGC 104 Lee NNNN NGC6752-NN = NGC 6752 NN M30-NN = Cl* NGC 7099 AL NN VB NN = Cl Melotte 25 NN
Acknowledgements: Beatriz Barbuy History: * 10-Jul-2003: Some modifications in the description of tablea.dat
(End) Patricia Bauer [CDS] 12-May-2003
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