J/ApJ/931/146 Very metal-poor stars with LAMOST & Subaru. I. (Aoki+, 2022)
Four-hundred very metal-poor stars studied with LAMOST and Subaru.
I. Survey design, follow-up program, and binary frequency.
Aoki W., Li H., Matsuno T., Xing Q., Chen Y., Christlieb N., Honda S.,
Ishigaki M.N., Shi J., Suda T., Tominaga N., Yan H.-L., Zhao J., Zhao G.
<Astrophys. J., 931, 146 (2022)>
=2022ApJ...931..146A 2022ApJ...931..146A
ADC_Keywords: Stars, metal-deficient; Binaries, spectroscopic; Spectra, optical;
Radial velocities; Abundances, [Fe/H]; Photometry, UBVRI
Keywords: Population II stars ; Stellar abundances ; Chemical abundances
Abstract:
The chemical abundances of very metal-poor stars provide important
constraints on the nucleosynthesis of the first generation of stars
and early chemical evolution of the Galaxy. We have obtained
high-resolution spectra with the Subaru Telescope for candidates of
very metal-poor stars selected with a large survey of Galactic stars
carried out with LAMOST. In this series of papers, we report on the
elemental abundances of about 400 very metal-poor stars and discuss
the kinematics of the sample obtained by combining the radial
velocities measured in this study and recent astrometry obtained with
Gaia. This paper provides an overview of our survey and follow-up
program, and reports radial velocities for the whole sample. We
identify seven double-lined spectroscopic binaries from our
high-resolution spectra, for which radial velocities of the components
are reported. We discuss the frequency of such relatively short-period
binaries at very low metallicity.
Description:
We acquired high-resolution spectroscopy using the Subaru Telescope
High Dispersion Spectrograph (HDS; 4030-6800Å with R=36000) for
420 very metal-poor stars selected by means of LAMOST DR1-DR5
low-resolution spectroscopy. Subaru/HDS observation dates span
2014 May 9-10 to 2018 Jan 24-27 (Proposal IDs S14A-112, S15A-093,
S15B-087 and S16A-119I).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 420 Objects studied with high-resolution spectra
table3.dat 62 445 Observation and kinematics information
table4.dat 46 7 Double-lined spectroscopic binaries
table5.dat 61 6 Equivalent widths of FeI lines in the primary stars
of double-lined spectroscopic binaries
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See also:
B/subaru : Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
J/AJ/124/1144 : Orbits of single-lined spectroscopic binaries (Latham, 2002)
J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)
J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)
J/A+A/484/721 : HES survey. IV. Cand. metal-poor stars (Christlieb+, 2008)
J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/ApJ/724/341 : Nucleosynthesis of massive metal-free stars (Heger+, 2010)
J/AJ/145/13 : Metal-poor stars from SDSS/SEGUE. I. Abund. (Aoki+, 2013)
J/ApJ/778/56 : Hamburg/ESO Survey extremely metal-poor stars (Cohen+, 2013)
J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)
J/A+A/579/A28 : Abundances of 3 CEMP stars (Bonifacio+, 2015)
J/ApJ/807/171 : SkyMapper Survey metal-poor star sp. (Jacobson+, 2015)
J/ApJS/238/16 : LAMOST-DR3 very metal-poor star catalog (Li+, 2018)
J/A+A/638/A145 : GALAH survey. FGK binary stars (Traven+, 2020)
J/MNRAS/492/3241 : The Pristine survey. IX. (Venn+, 2020)
J/ApJ/931/147 : Very metal-poor stars with LAMOST & Subaru. II. (Li+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID Short ID of a star (JHHMM+DDMM)
12- 17 A6 --- --- [LAMOST]
19- 37 A19 --- LAMOST LAMOST position-based object
name (JHHMMSS.ss+DDMMSS.s)
39- 44 F6.3 mag Vmag [10/16.7]?=99.99 APASS V magnitude
46- 50 F5.3 mag EBVd [0.008/0.5] E(B-V) estimated from dust map
from Green+ 2018MNRAS.478..651G 2018MNRAS.478..651G
52- 57 F6.3 mag EBVNaD [0/0.8]?=-9.9 E(B-V) estimated from
interstellar NaD lines (1)
59- 64 F6.3 mag B0mag [10/17]?=99.99 Reddening-corrected APASS B
magnitude (2)
66- 71 F6.3 mag V0mag [9.7/16.6]?=99.99 Reddening-corrected APASS V
magnitude (2)
73- 78 F6.3 mag g0mag [10.29/18.7]?=99.99 Reddening-corrected APASS g
magnitude (2)
80- 85 F6.3 mag r0mag [9.6/17.8]?=99.99 Reddening-corrected APASS r
magnitude (2)
87- 92 F6.3 mag J0mag [8.9/15.7] Reddening-corrected 2MASS J
magnitude (2)
94- 99 F6.3 mag Ks0mag [8.3/15.3] Reddening-corrected 2MASS Ks
magnitude (2)
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Note (1): Interstellar reddening, E(B-V), adopting the relation between the
reddening and the NaD line absorption given by
Poznanski+ 2012MNRAS.426.1465P 2012MNRAS.426.1465P, equation (9) for the equivalent width
combined for D1 and D2 lines.
Note (2): Reddening-corrected using EBVd.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID Short ID of a star (JHHMM+DDMM)
12- 21 A10 "Y/M/D" Date Date of observation (UT)
23- 27 F5.1 --- SNR [6/173.2] Signal to noise ratio, per pixel at
450nm
29- 34 F6.1 km/s HRV [-455/434] Heliocentric radial velocity,
Subaru/HDS
36- 38 F3.1 km/s e_HRV [0/2] Error of heliocentric radial velocity
40- 45 F6.3 mas plx [-0.4/6.2]?=-9.99 Gaia DR2 Parallax
47- 51 F5.3 mas e_plx [0.013/0.4]?=9.99 Error of parallax
53- 57 I5 pc Dist [-10/10957] Distance, from plx
59- 62 I4 pc e_Dist [1/2448] Error of distance
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID Short ID of a star (JHHMM+DDMM)
12- 18 F7.2 km/s HRV-A [-293/53] Heliocentric radial velocity of
component A
21- 24 F4.2 km/s e_HRV-A [0.04/1.3] Uncertainty in HRV-A
26- 32 F7.2 km/s HRV-B [-252/107] Heliocentric radial velocity of
component B
34- 37 F4.2 km/s e_HRV-B [0.05/0.7] Uncertainty in HRV-B
39- 40 I2 --- Nl [7/45] Number of lines used in the analysis
42- 45 F4.1 --- [Fe/H] [-3.2/-1.8] Metallicity
46 A1 --- u_[Fe/H] Uncertainty flag on [Fe/H]
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda [4063.59/4191.5] Wavelength, FeI,
Angstroms
10- 15 F6.3 [-] loggf [-0.7/0.07] Log, statistical
weight*oscillator strength
17- 21 F5.3 eV ExPot [1.5/2.9] Excitation potential
23- 27 F5.1 0.1pm EW-J0241+0946 [46/157.6]? Equivalent width, FeI,
J0241+0946
29- 33 F5.1 0.1pm EW-J1144+4032 [110]? Equivalent width, FeI, J1144+4032
35- 38 F4.1 0.1pm EW-J1216+0231 [40.8/83.8]? Equivalent width, FeI,
J1216+0231
40- 43 F4.1 0.1pm EW-J1220+1637 [71.2]? Equivalent width, FeI,
J1220+1637
45- 49 F5.1 0.1pm EW-J1231+1232 [65.7/110.5]? Equivalent width, FeI,
J1231+1232
51- 55 F5.1 0.1pm EW-J1859+4506 [21.6/111.6]? Equivalent width, FeI,
J1859+4506
57- 61 F5.1 0.1pm EW-J2121-0138 [60.9/170.6]? Equivalent width, FeI,
J2121-0138
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History:
From electronic version of the journal
References:
Li et al. Paper II. 2022ApJ...931..147L 2022ApJ...931..147L Cat. J/ApJ/931/147
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Apr-2024