J/other/RAA/16.G10 [alpha/Fe] ratios from LAMOST spectra (Li+, 2016)
A method of measuring the [α/Fe] ratios from the spectra of the
LAMOST survey.
Li J., Han C., Xiang M.-S., Shi J.-R., Zhao J.-K., Liu X.-W., Zhang H.-W.,
Yuan H.-B., Ci X., Zhang X.-F., Wang Y.-W., Huang Y., Zhang Y., Hou Y.-H.,
Wang Y.-F., Cao Z.-H.
<Research in Astron. and astroph., 16, part no 7, 10 (2016)>
=2016RAA....16..110L 2016RAA....16..110L
=2016RAA....16g..10L 2016RAA....16g..10L (SIMBAD/NED BibCode)
ADC_Keywords: Spectroscopy ; Abundances
Keywords: Galaxy: evolution - stars: abundances -
stars: fundamental parameters - techniques: spectroscopy surveys -
methods: data analysis
Abstract:
The [α/Fe] ratios in stars are good tracers to probe the
formation history of stellar populations and the chemical evolution of
the Galaxy. The spectroscopic survey of LAMOST provides a good
opportunity to determine [α/Fe] of millions of stars in the
Galaxy. We present a method of measuring the [α/Fe] ratios from
LAMOST spectra using the template-matching technique of the LSP3
pipeline. We use three test samples of stars selected from the ELODIE
and MILES libraries, as well as the LEGUE survey to validate our
method. Based on the test results, we conclude that our method is
valid for measuring [α/Fe] from low-resolution spectra acquired
by the LAMOST survey. Within the range of the stellar parameters
Teff=[5000, 7500]K, logg=[1.0, 5.0]dex and [Fe/H]=[-1.5, +0.5]dex,
our [α/Fe] measurements are consistent with values derived from
high-resolution spectra, and the accuracy of our [α/Fe]
measurements from LAMOST spectra is better than 0.1dex with spectral
signal-to-noise higher than 20.
Description:
Using the template-matching technique of the LSP3 pipeline, we provide
a method of measuring the [α/Fe] abundances from low-resolution
spectra provided by the LAMOST survey. We do three tests to examine
the validity of our method by employing sample stars from the ELODIE
and MILES libraries, as well as the LAMOST survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 89 98 List of the atmospheric parameters and the
[alpha/Fe] values for HRS
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See also:
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
J/AJ/150/187 : Abundances and stellar parameters of LAMOST stars (Lee+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
12- 44 A33 --- SpecID LAMOST spectrum ID
46- 49 I4 K TeffH High-resolution effective temperature
51- 54 F4.2 [cm/s2] loggH High-resolution surface gravity
56- 60 F5.2 [-] [Fe/H]H High-resolution metallicity
62- 67 F6.3 [-] [alpha/Fe]H High-resolution [alpha/Fe] abundance
69- 72 I4 K TeffL LSP3 effective temperature
74- 77 F4.2 [cm/s2] loggL LSP3 surface gravity
79- 83 F5.2 [-] [Fe/H]L LSP3 metallicity
85- 89 F5.2 [-] [alpha/Fe]L LSP3 [alpha/Fe] abundance
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Sep-2016