J/A+A/525/A71 Atmospheric parameters for 1273 stars (Wu+, 2011)
Coude-feed stellar spectral library - atmospheric parameters.
Wu Y., Singh H.P., Prugniel P., Gupta R., Koleva M.
<Astron. Astrophys. 525, A71 (2011)>
=2011A&A...525A..71W 2011A&A...525A..71W
ADC_Keywords: Stars, atmospheres ; Atlases ; Effective temperatures ;
Abundances, [Fe/H]
Keywords: stars: fundamental parameters - galaxies: stellar content
Abstract:
Empirical libraries of stellar spectra play an important role in
different fields. For example, they are used as reference for the
automatic determination of atmospheric parameters, or for building
synthetic stellar populations to study galaxies. The CFLIB (Coude-feed
library, Indo-US) database is at present one of the most complete
libraries, in terms of its coverage of the atmospheric parameters
space (Teff, logg and [Fe/H]) and wavelength coverage 3460-9464Å at
a resolution of ∼1Å FWHM. Although the atmospheric parameters of
most of the stars were determined from detailed analyses of
high-resolution spectra, for nearly 300 of the 1273 stars of the
library at least one of the three parameters is missing. For the
others, the measurements, compiled from the literature, are
inhomogeneous.
In this paper, we re-determine the atmospheric parameters, directly
using the CFLIB spectra, and compare them to the previous studies.
Methods. We use the ULySS program to derive the atmospheric
parameters, using the ELODIE library as a reference.
Based on comparisons with several previous studies we conclude that
our determinations are unbiased. For the 958 F,G, and K type stars the
precision on Teff, logg, and [Fe/H] is respectively 43K, 0.13dex and
0.05dex. For the 53 M stars they are 82K, 0.22dex and 0.28dex. And
for the 260 OBA type stars the relative precision on Teff is 5.1%, and
on logg, and [Fe/H] the precision is respectively 0.19 dex and 0.16
dex. These parameters will be used to re-calibrate the CFLIB fluxes
and to produce synthetic spectra of stellar populations.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 66 1273 Physical parameters adopted by this work
table3a.dat 70 79 ULySS and adopted parameters for 79 stars
table3b.dat 80 228 Outliers found in the comparisons for 79 stars
--------------------------------------------------------------------------------
See also:
III/251 : ELODIE library V3.1 (Prugniel+ 2007)
J/ApJS/152/251 : Indo-US Library of Coude Feed Stellar Spectra (Valdes+, 2004)
http://www.noao.edu/cflib : Indo-US library of coude feed stellar spectra
http://ulyss.univ-lyon1.fr/ : ULySS software package home page
http://www.obs.u-bordeaux1.fr/m2a/soubiran/elodie_library.html :
ELODIE home page
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Stellar identification
13- 24 A12 --- SpType MK Spectral type
27- 31 I5 K Teff ? Effective temperature
34- 37 I4 K e_Teff ? Error of effective temperature (1)
40- 43 F4.2 [cm/s2] log(g) ? Log of the surface gravity
46- 49 F4.2 [cm/s2] e_log(g) ? Error of the log of the surface gravity (1)
52- 56 F5.2 [Sun] [Fe/H] ? Metallicity
59- 62 F4.2 [Sun] e_[Fe/H] ? Error of metallicity (1)
65- 66 A2 --- r_[Fe/H] Indicate the origin of adopted parameters (G1)
--------------------------------------------------------------------------------
Note (1): The internal errors are given only when Flag = 0 or 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3a.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Stellar identification
11- 15 I5 K TeffU ULySS fitted effective temperature
18- 21 I4 K e_TeffU Internal error given by ULySS
24- 27 F4.2 [cm/s2] log(g)U ULySS fitted log of the surface gravity
30- 33 F4.2 [cm/s2] e_log(g)U Internal error given by ULySS
36- 40 F5.2 [Sun] [Fe/H]U ULyss fitted metallicity
43- 46 F4.2 [Sun] e_[Fe/H]U Internal error given by ULySS
49- 53 I5 K Teff Adopted effective temperature
56- 59 F4.2 [cm/s2] log(g) Adopted log of the surface gravity
62- 66 F5.2 [Sun] [Fe/H] Adopted metallicity
69- 70 A2 --- r_[Fe/H] Indicate the origin of adopted parameters (G1)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Stellar identification
12- 16 I5 K Teff ? Effective temperature from reference
19- 22 F4.2 [cm/s2] log(g) ? Log of the surface gravity from reference
25- 29 F5.2 [Sun] [Fe/H] ? Metallicity from reference
32- 80 A49 --- r_[Fe/H] Reference source (1)
--------------------------------------------------------------------------------
Note (1): Codes for reference as:
ELODIE_I = ELODIE internal determinations
fit_ELO = means ULySS fit of an ELODIE spectrum
fit_3900 = means fit of the CFLIB spectrum starting from 3900Å
instead of 4400Å
fix log(g) = fixed log(g)
--------------------------------------------------------------------------------
Global notes:
Note (G1): Flag indicates the origin of the adopted parameters as follows:
0 = standard fit of the CFLIB spectrum
1 = fit of the CFLIB spectrum starting from 3900Å
2 = value from literature
2m = mean value from the literature, see details in the text
3 = ULySS fit of an ELODIE spectrum
4 = improved fit, see details in the text
--------------------------------------------------------------------------------
Acknowledgements:
Yue Wu, wmoon211(at)gmail.com
References:
Koleva et al., 2009A&A...501.1269K 2009A&A...501.1269K, ULySS: a full spectrum fitting package
(End) Yue Wu [NAOC, China], Patricia Vannier [CDS] 18-Nov-2010