J/ApJS/271/58 Lithium abundances from LAMOST MRS DR9 spectra (Ding+, 2024)
Lithium abundances from the LAMOST Medium-Resolution Survey Data Release 9.
Ding M.-Y., Shi J.-R., Yan H.-L., Li C.-Q., Gao Qi, Chen T.-Y.,
Zhang J.-H., Liu S., Xie X.-J., Tang Y.-J., Zhou Z.-M., Wang J.-T.
<Astrophys. J. Suppl. Ser., 271, 58 (2024)>
=2024ApJS..271...58D 2024ApJS..271...58D
ADC_Keywords: Abundances; Spectra, optical; Radial velocities
Keywords: Chemical abundances ; Stellar evolution ; Lithium stars ;
Sky surveys ; Catalogs ; Chemically peculiar stars ;
Late-type stars ; Nucleosynthesis ; Fundamental parameters of stars ;
Low mass stars
Abstract:
Lithium is a fragile but crucial chemical element in the Universe, and
exhibits interesting and complex behaviors. Thanks to the mass of
spectroscopic data from the Large Sky Area Multi-Object Fiber
Spectroscopic Telescope (LAMOST) medium-resolution survey (MRS), we
can investigate the lithium abundances in a large and diverse sample
of stars, which could bring vital help in studying the origin and
evolution of lithium. In this work, we use the LiI6707.8Å line to
derive the lithium abundance through a template-matching method. A
catalog of precise lithium abundance is presented for 795384 spectra
corresponding to 455752 stars from the LAMOST MRS Data Release 9.
Comparing our results with those of external high-resolution
references, we find good consistency with a typical deviation of
σA(Li)∼0.2dex. We also analyze the internal errors using stars
that have multiple LAMOST MRS observations, which will reach as low as
0.1 dex when the signal-to-noise ratio of the spectra is >20. Besides,
our result indicates that a small fraction of giant stars still
exhibit a surprisingly high lithium content, and 967 stars are
identified as Li-rich giants with A(Li)>1.5dex, accounting for
∼2.6% of our samples. If one takes into account the fact that nearly
all stars deplete lithium during the main sequence, then the fraction
of Li-rich stars may far exceed 2.6%. This new catalog covers a wide
range of stellar evolutionary stages from pre-main sequence to giants,
and will provide help to the further study of the chemical evolution
of lithium.
Description:
The data set used in this work is composed of two parts: the
observational spectra from the LAMOST medium-resolution survey (MRS)
Data Release (DR) 9 and the reference set consisting of lithium
abundances provided by other surveys (GALAH and Gaia-ESO), which is
used for validation of our result.
The LAMOST survey uses a large-aperture reflective Schmidt telescope
located at the Xinglong Observatory in Hebei province, China. In the
year 2017, the spectrographs were upgraded to support two different
modes: low resolution (R∼1800) and medium resolution (R∼7500). For the
medium-resolution mode, the wavelength range is from 4950 to 5350Å
in the blue band, while the red band covers 6300-6800Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 117 455752 The catalog of lithium abundances
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See also:
III/218 : ELODIE archive (Prugniel+, 2001)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/106/1080 : Lithium in Praesepe (Soderblom+, 1993)
J/A+A/576/A69 : Li abundances in F stars (Delgado Mena+, 2015)
J/MNRAS/448/822 : LAMOST candidate members of star clusters (Xiang+, 2015)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
J/A+A/595/A18 : Lithium abundances in AMBRE stars (Guiglion+, 2016)
J/ApJ/819/135 : Lithium-rich giants in globular clusters (Kirby+, 2016)
J/other/RAA/16.G10 : [alpha/Fe] ratios from LAMOST spectra (Li+, 2016)
J/AJ/153/128 : WOCS. LXXV. Lithium in Hyades & Praesepe (Cummings+, 2017)
J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)
J/MNRAS/476/3245 : M dwarfs in the Pleiades (Jackson+, 2018)
J/AJ/158/163 : Li abundances for stars in NGC 6819 (Deliyannis+, 2019)
J/MNRAS/483/1125 : Radius inflation in Praesepe M-dwarfs (Jackson+, 2019)
J/A+A/633/A34 : Lithium in red giant stars (Charbonnel+, 2020)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/ApJ/914/116 : Lithium abundances from LAMOST MRS. I. (Gao+, 2021)
J/A+A/668/A49 : Lithium curves of growth (Franciosini+, 2022)
J/A+A/666/A121 : Cluster target Giraffe HR15N RV precision (Randich+, 2022)
J/A+A/676/A129 : Gaia-ESO catalogue version 5.1 (Hourihane+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- LAMOST LAMOST target identifier (JHHMMSS.ss+DDMMSS.s)
21- 29 I9 --- ObsID [588902005/913916244] LAMOST unique spectra
identifier
31- 49 I19 --- Gaia ?=-9999 Gaia DR3 identifier
51- 52 I2 h RAh Hour of Right Ascension (J2000)
54- 55 I2 min RAm Minute of Right Ascension (J2000)
57- 61 F5.2 s RAs Second of Right Ascension (J2000)
63- 63 A1 --- DE- Sign of the Declination (J2000)
64- 65 I2 deg DEd Degree of Declination (J2000)
67- 68 I2 arcmin DEm Arcminute of Declination (J2000)
70- 73 F4.1 arcsec DEs Arcsecond of Declination (J2000)
75- 77 I3 --- S/N [0/595] The r-band signal-to-noise ratio
79- 82 I4 km/s RVel [-498/498] Radial velocity
84- 87 I4 K Teff [3259/7499] Effective temperature
89- 93 F5.2 [cm/s2] logg [-0.4/5.3] log surface gravity
95- 99 F5.2 [Sun] [Fe/H] [-2.5/0.95] Metallicity
101-104 F4.1 [Sun] A(Li) [-3/7] log Lithium abundance
106-108 F3.1 [Sun] DelA(Li) [0/9.1] Maximum of ΔA(Li), max_diff (1)
110-112 F3.1 [Sun] e_DelA(Li) [0/4.4] Standard deviation of ΔA(Li),
std_diff
114-115 I2 --- Flag [0/53] LiI strength flag (2)
117-117 I1 --- Lim [0/1] Upper limit sign
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Note (1): The largest difference of deduced A(Li) between multiple exposures of
the same star.
Note (2): The flag is a ratio between the depth of the LiI6707.8Å line and
the residual fluctuations.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Jun-2024