J/A+A/359/18 Line-strength predictions in Elliptical Galaxies (Molla+, 2000)
Models for the interpretation of Ca Triplet and the blue spectral indices
in elliptical nuclei.
Molla M., Garcia-Vargas M.L.
<Astron. Astrophys. 359, 18 (2000)>
=2000A&A...359...18M 2000A&A...359...18M
ADC_Keywords: Models, evolutionary ; Equivalent widths
Keywords: galaxies: elliptical and lenticular, cD
Description:
This table shows the line-strength predictions computed for: CaT, NaI,
and MgI in the near infrared and Mgb, Mg2, Fe52, Fe53, NaD and
Hβ, in the blue-visible range, for Single Stellar Population
(SSP) of 6 different metallicities, (Z=0.0004, 0.001, 0.004, 0.008,
0.02 and 0.05), and ages from log(age)=6.60 (4Gyr) to log(age)=10.30
(20Gyr), in steps of 0.10dex from 6.60 until 10.00, and 0.02
afterwards. (Therefore there are 50 records for each metallicity
except that Z=0.001 has only 47). All indices have been computed taken
the model atmospheres from Lejeune et al. (1997, Cat.
J/A+AS/125/229, 1998, Cat. J/A+AS/130/65) and Clegg & Middlemass
(1987MNRAS.228..759C 1987MNRAS.228..759C) for hot stars (Teff > 50000 K). The used
isochrones are from the Padova group (Bressan et al., 1993, Cat.
J/A+AS/100/647). The total mass of every SSP is 109M☉ with a
Salpeter-type IMF, Phi(m)=m-α, with α=2.35, from
mlow=0.6M☉_ to mup=100M☉. The fitting functions for blue
indices are those from Worthey et al. (1994, Cat. J/ApJS/94/687).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 75 297 Line-strength predictions
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See also:
J/A+AS/130/65 : A standard stellar library. II. (Lejeune+ 1998)
J/A+AS/125/229 : A standard stellar library (Lejeune+ 1997)
J/A+AS/100/647 : Evolutionary Sequences II. (Bressan+ 1993)
J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Z Total metallicity in % mass (Z☉=0.02)
8- 12 F5.2 [yr] log(age) Age of each SSP in logarithmic scale
14- 19 F6.3 0.1nm CaT Calcium triplet index equivalent width
21- 26 F6.3 0.1nm NaI NaI equivalent width
28- 33 F6.3 0.1nm MgI MgI equivalent width
35- 40 F6.3 0.1nm Mgb Mgb equivalent width
42- 47 F6.3 mag Mg2 Mg2 Index in magnitudes
49- 54 F6.3 0.1nm Fe52 Fe5270 equivalent width
56- 61 F6.3 0.1nm Fe53 Fe5335 equivalent width
63- 68 F6.3 0.1nm NaD NaD equivalent width
70- 75 F6.3 0.1nm Hb Hβ equivalent width
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Acknowledgements: Mercedes Molla
(End) Patricia Bauer [CDS] 22-Jun-2000