J/ApJS/251/15 LAMOST-Kepler/K2 survey (LK-MRS) first year obs. (Zong+, 2020)
Phase II of the LAMOST-Kepler/K2 survey.
I. Time series of medium-resolution spectroscopic observations.
Zong W., Fu J.-N., De Cat P., Wang J., Shi J., Luo A., Zhang H., Frasca A.,
Molenda-Zakowicz J., Gray R.O., Corbally C.J., Catanzaro G., Cang T.,
Wang J., Chen J., Hou Y., Liu J., Niu H., Pan Y., Tian H., Yan H., Zhang Y.,
Zuo H.
<Astrophys. J. Suppl. Ser., 251, 15 (2020)>
=2020ApJS..251...15Z 2020ApJS..251...15Z
ADC_Keywords: Abundances, [Fe/H]; Radial velocities; Spectra, optical; Surveys
Keywords: Catalogs ; Spectroscopy ; Surveys ; Fundamental parameters of stars ;
Astrostatistics ; Astronomy databases
Abstract:
Phase II of the Large Sky Area Multi-Object Fibre Spectroscopic
Telescope (LAMOST)-Kepler/K2 survey (LK-MRS), initiated in 2018, aims
at collecting medium-resolution spectra (R∼7500; hereafter MRS) for
more than 50000 stars with multiple visits (∼60 epochs) over a period
of 5yr (2018 September to 2023 June). We selected 20 footprints
distributed across the Kepler field and six K2 campaigns, with each
plate containing a number of stars ranging from ∼2000 to ∼3000. During
the first year of observations, the LK-MRS has already visited 13
plates 223 times over 40 individual nights, and collected ∼280000 and
∼369000 high-quality spectra in the blue and red wavelength ranges,
respectively. The atmospheric parameters and radial velocities for
∼259000 spectra of 21053 targets were successfully calculated by the
LAMOST stellar parameter pipeline. The internal uncertainties for the
effective temperature, surface gravity, metallicity, and radial
velocity are found to be 100K, 0.15dex, 0.09dex, and 1.00km/s,
respectively, when derived from a medium-resolution LAMOST spectrum
with a signal-to-noise ratio (S/N) in the g band of 10. All of the
uncertainties decrease as S/N increases, but they stabilize for
S/N>100. We found 14997, 20091, and 1514 stars in common with the
targets from the LAMOST low-resolution survey (LRS), Gaia, and the
Apache Point Observatory Galactic Evolution Experiment (APOGEE),
respectively, corresponding to fractions of ∼70%, ∼95%, and ∼7.2%. In
general, the parameters derived from LK-MRS spectra are consistent
with those obtained from the LRS and APOGEE spectra, but the scatter
increases as the surface gravity decreases when comparing with the
measurements from APOGEE. A large discrepancy is found with the Gaia
values of the effective temperature. Comparisons of the radial
velocities of LK-MRS to Gaia and LK-MRS to APOGEE nearly follow a
Gaussian distribution with means of µ∼1.10 and 0.73km/s,
respectively. We expect that the results from the LK-MRS spectra will
shed new light on binary stars, asteroseismology, stellar activity,
and other research fields.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 103 21053 Database of atmospheric parameters and radial
velocities obtained from the spectra collected
in the first year of the LK-MRS survey
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
J/A+A/454/301 : Radial velocities of 6 binaries (Frasca+, 2006)
J/ApJ/640/1051 : 25pc sample of Sun-like stars (Grether+, 2006)
J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/AJ/141/83 : Kepler Mission. I. Eclipsing binaries in DR1 (Prsa+, 2011)
J/A+A/525/A71 : Atmospheric parameters for 1273 stars (Wu+, 2011)
J/A+A/543/A160 : Normalized spectra of 82 Kepler red giants (Thygesen+, 2012)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/ApJS/211/2 : Revised stellar data of Q1-16 Kepler targets (Huber+, 2014)
J/MNRAS/453/1095 : NGC 6866 UBVRI photometry (Bostanci+, 2015)
J/ApJS/220/19 : LAMOST obs. in the Kepler field. I. (De Cat+, 2015)
J/MNRAS/454/2787 : LAMOST DR2 white dwarfs (Guo+, 2015)
J/MNRAS/450/2764 : Spectroscopic survey of Kepler stars. I. (Niemczura+, 2015)
J/A+A/594/A39 : LAMOST-Kepler param. & activity indicators (Frasca+, 2016)
J/AJ/151/13 : LAMOST-Kepler MKCLASS spectral classification (Gray+, 2016)
J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)
J/AJ/152/187 : Planet occurrence and metallicity for KOIs (Mulders+, 2016)
J/ApJS/232/23 : 27 pulsating DA WDs follow-up observations (Hermes+, 2017)
J/AJ/154/107 : California-Kepler Survey (CKS). I. (Petigura+, 2017)
J/ApJS/233/23 : APOKASC cat. of KIC dwarfs and subgiants (Serenelli+, 2017)
J/AJ/156/71 : K2: young disk-bearing stars in Sco & Oph (Cody+, 2018)
J/ApJ/861/149 : Kepler Follow-up Obs. Program. II. Spectro. (Furlan+, 2018)
J/MNRAS/474/4322 : Orbital parameters of 341 new binaries (Murphy+, 2018)
J/ApJS/239/32 : APOKASC-2 cat. of Kepler evolved stars (Pinsonneault+, 2018)
J/A+A/631/A125 : 54 massive companions detected with SOPHIE (Kiefer+, 2019)
J/ApJS/243/28 : Magnetic activities from LAMOST & Kepler (Lu+, 2019)
J/ApJ/875/29 : Spectrosc. analysis of the CKS sample. I. (Martinez+, 2019)
J/MNRAS/484/L8 : Correcting HIRES/Keck RVs for syst. errors (Tal-Or+, 2019)
J/ApJS/244/27 : Radial velocity measurements in LAMOST-II (Wang+, 2019)
J/ApJS/241/29 : Flare catalog through LC data of Kepler DR25 (Yang+, 2019)
http://dr7.lamost.org/ : LAMOST DR7 home page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Target identifier (JHHMMSS.ss+DDMMSS.s)
21- 29 I9 --- ID [5092700/251412092]? Kepler Input Catalog
(KIC) or EPIC identifier (1)
31- 40 F10.6 deg RAdeg [12.9/297.7] Right Ascension (J2000)
42- 50 F9.6 deg DEdeg [0.7/47] Declination (J2000)
52- 55 I4 K Teff [3128/8481] Weighted average effective
temperature
57- 60 I4 K e_Teff [0/2514]? Uncertainty in Teff
62- 65 F4.2 [cm/s2] log(g) [0.01/5] Weighted average log surface gravity
67- 70 F4.2 [cm/s2] e_log(g) [0/2.3]? Uncertainty in log(g)
72- 77 F6.3 [-] [Fe/H] [-2.5/0.7]? Weighted average metallicity
79- 83 F5.3 [-] e_[Fe/H] [0/3]? Uncertainty in [Fe/H]
85- 92 F8.2 km/s RVel [-9999/347]? Weighted average radial velocity
94-100 F7.2 km/s e_RVel [0/4054]? Uncertainty in RVel
102-103 I2 --- Nmrs [1/45] Number of medium-resolution spectra
(MRS) spectra analysed (2)
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Note (1): The cross-match identification to the KIC/EPIC catalog where a
coordinate separation of 3.7" is used as the limit (if available).
EPIC (IV/34) numbers if >201000000 else KIC (V/133) numbers.
Note (2): When only one spectrum was available the errors are set to the
uncertainty derived by LASP.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Feb-2021