J/other/RAA/11.924 Atmospheric parameters for 771 stars (Wu+, 2011)
Automatic Determination of Stellar Atmospheric Parameters and Construction of
Stellar Spectral Templates of the Guoshoujing Telescope (LAMOST).
Wu Y., Luo A.L., Li H.N., Shi J.R., Prugniel P., Liang Y.C., Zhao Y.H.,
Zhang J.N., Bai Z.R., Wei P., Dong W.X., Zhang H.T., Chen J.J.
<Res. Astron. Astrophys., 11, 924 (2011)>
=2011RAA....11..924W 2011RAA....11..924W
ADC_Keywords: Stars, atmospheres ; Atlases ; Effective temperatures ;
Abundances, [Fe/H]
Keywords: stars: fundamental parameters - galaxies: stellar content
Abstract:
A number of spectroscopic surveys have been carried out or are planned
to study the origin of the Milky Way. Their exploitation requires
reliable automated methods and softwares to measure the fundamental
parameters of the stars. Adopting the ULySS package, we have tested
the effect of different resolutions and signal-to-noise ratios (SNR)
on the measurement of the stellar atmospheric parameters (effective
temperature Teff, surface gravity logg, and metallicity [Fe/H]). We
show that ULySS is reliable to determine these parameters with
medium-resolution spectra (R∼2000). Then, we applied the method to
measure the parameters of 771 stars selected in the commissioning
database of the Guoshoujing Telescope (GSJT). The results were
compared with the SDSS/SEGUE Stellar Parameter Pipeline (SSPP), and we
derived precisions of 167K, 0.34dex, and 0.16dex for Teff, logg and
[Fe/H] respectively. Furthermore, 120 of these stars are selected to
construct the primary stellar spectra template library (Version 1.0)
of GSJT, and will be deployed as basic ingredients for the GSJT
automated parametrization pipeline.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 79 771 Physical parameters adopted by this work
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See also:
III/251 : ELODIE library V3.1 (Prugniel+ 2007)
J/A+A/525/A71 : Atmospheric parameters for 1273 stars (Wu+, 2011)
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: table.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Sp [1/15] No. of the spectrograph
5- 7 I3 --- Fib Fiber ID number
10- 20 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
23- 32 F10.7 deg DEdeg Declination in decimal degrees (J2000)
35- 39 F5.2 --- Rmag R magnitude from SuperCOSMOS catalog (1)
42- 46 I5 K Teff Effective temperature
49- 51 I3 K e_Teff Error of effective temperature (2)
54- 57 F4.2 [cm/s2] log(g) Log of the surface gravity
60- 63 F4.2 [cm/s2] e_log(g) Error of the log of the surface gravity (2)
66- 70 F5.2 [Sun] [Fe/H] Metallicity
73- 76 F4.2 [Sun] e_[Fe/H] Error of metallicity (2)
79 I1 --- Flag [0/1] Indication of whether chosen as a
template (3)
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Note (1): Optical R magnitude from SuperCOSMOS source catalog, photographic
photometry, optical R band between 600 and 750nm.
Note (2): The internal errors returned by ULySS.
Note (3): A flag indicates that if the spectrum was selected as a member of the
stellar spectra template library as follows:
0 = not a member of the library
1 = a member of the library
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Acknowledgements:
Yue Wu, wmoon211(at)gmail.com
(End) Yue Wu [NAOC, China], Patricia Vannier [CDS] 09-Jun-2011