Phase II of the LAMOST-Kepler/K2 survey. I. Time series of medium-resolution spectroscopic observations

Abstract

Phase \RNum{2} of the LAMOST-{\sl Kepler/K}2 survey (LK-MRS), initiated in 2018, aims at collecting medium-resolution spectra ($R\sim 7,500$; hereafter MRS) for more than $50,000$ stars with multiple visits ($\sim 60$ epochs) over a period of 5 years (2018 September to 2023 June). We selected 20 footprints distributed across the {\sl Kepler} field and six {\sl K}2 campaigns, with each plate containing a number of stars ranging from $\sim 2,000$ to $\sim 3,000$. During the first year of observations, the LK-MRS has already collected $\sim 280,000$ and $\sim 369,000$ high-quality spectra in the blue and red wavelength range, respectively. The atmospheric parameters and radial velocities for $\sim 259,000$ spectra of $21,053$ targets were successfully calculated by the LASP pipeline. The internal uncertainties for the effective temperature, surface gravity, metallicity, and radial velocity are found to be $100$\,K, $0.15$\,dex, $0.09$\,dex, and $1.00$\,km\,s${}^{-1}$, respectively. We found $14,997$, $20,091$, and $1,514$ stars in common with the targets from the LAMOST low-resolution survey (LRS), GAIA and APOGEE, respectively, corresponding to a fraction of $\sim 70\%$, $\sim 95\%$ and $\sim 7.2\%$. 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. The comparisons of radial velocities of LK-MRS to GAIA and LK-MRS to APOGEE nearly follow an Gaussian distribution with a mean $\mu \sim 1.10$ and $0.73$\,km\,s${}^{-1}$, respectively.

24 pages, 15 figures, 4 tables, ApJS, accepted

References in corpus (25)

• The Gaia mission
• The K2 Mission: Characterization and Early results
• Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
• A wide star-black-hole binary system from radial-velocity measurements
• White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
• The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars
• Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra
• The flare catalog and the flare activity in the Kepler mission
• Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars
• A Spectroscopic Analysis of the California-Kepler Survey Sample: I. Stellar Parameters, Planetary Radii and a Slope in the Radius Gap
• Finding binaries from phase modulation of pulsating stars with Kepler: V. Orbital parameters, with eccentricity and mass-ratio distributions of 341 new binaries
• The Evolution of Flare Activity with Stellar Age
• LAMOST telescope reveals that Neptunian cousins of hot Jupiters are mostly single offspring of stars that are rich in heavy elements
• A Super-Solar Metallicity For Stars With Hot Rocky Exoplanets
• A new method for the spectroscopic identification of stellar non-radial pulsation modes. I. The method and numerical tests
• Spots, plages, and flares on lambda Andromedae and II Pegasi
• Signatures of nonlinear mode interactions in the pulsating hot B subdwarf star KIC 10139564
• LAMOST observations in the Kepler field. Analysis of the stellar parameters measured with the LASP based on the low-resolution spectra
• A planet in an 840-d orbit around a Kepler main-sequence A star found from phase modulation of its pulsations
• Radial velocity measurements from LAMOST medium-resolution spectroscopic observations: A pointing towards the Kepler field
• TESS first look at evolved compact pulsators : Discovery and asteroseismic probing of the g-mode hot B subdwarf pulsator EC 21494-7018
• HIDES spectroscopy of bright detached eclipsing binaries from the $Kepler$ field - III. Spectral analysis, updated parameters, and new systems
• A Method to Search for Black Hole Candidates with Giant Companions by LAMOST
• Evolution of Exoplanets and their Parent Stars
• The YNEV stellar evolution and oscillation code

Cited by in corpus (29)

• Self-consistent Stellar Radial Velocities from LAMOST Medium-Resolution Survey (MRS) DR7
• Overview of the LAMOST survey in the first decade
• Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra
• The Spectroscopic Binaries from LAMOST Medium-Resolution Survey (MRS). I. Searching for Double-lined Spectroscopic Binaries (SB2s) with Convolutional Neural Network
• LAMOST Time-Domain Survey: First Results of four $K$2 plates
• Magnetic activity evolution of solar-like stars: I. S_ph-Age relation derived from Kepler observations
• LAMOST Observations in 15 \textit{K}2 Campaigns: I. Low resolution spectra from LAMOST DR6
• Stellar Parameters and Chemical Abundances Estimated from LAMOST-II DR8 MRS based on Cycle-StarNet
• Temporal variation of the photometric magnetic activity for the Sun and Kepler solar-like stars
• An X-Ray-dim "Isolated'' Neutron Star in a Binary?
• Discovery of one neutron star candidate from radial velocity monitoring
• The Nearest Neutron Star Candidate in a Binary Revealed by Optical Time-domain Surveys
• Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey
• Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT
• Stellar chromospheric activities revealed from the LAMOST-K2 time-domain survey
• Binaries with possible compact components discovered from the LAMOST Time-Domain Survey of four $K$2 plates
• A White Dwarf-Main Sequence Binary Unveiled by Time-Domain Observations from LAMOST and TESS
• Asteroseismology of RRab variable star EZ Cnc from K2 photometry and LAMOST spectroscopy
• Homogeneous Stellar Atmospheric Parameters and 22 Elemental Abundances for FGK Stars Derived From LAMOST Low-resolution Spectra with DD-Payne
• Amplitude and frequency variations in PG~0101+039 from K2 photometry -- A pulsating hot B subdwarf star in an unsynchronized binary system
• Searching for Compact Object Candidates from LAMOST Time-Domain Survey of Four K2 Plates
• A fast-rotating blue straggler star in the tidal tail of the open cluster NGC 752
• The Properties and Evolutions of Starspots on Three Detached Eclipsing Binaries in the LAMOST-Kepler survey
• LAMOST medium-resolution observations of the Pleiades
• LTD064402+245919: A Subgiant with a 1-3 M${}_{\odot }$ Undetected Companion Identified from LAMOST-TD Data
• LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection
• The K2 Galactic Archaeology Program: Overview, target selection and survey properties
• A photometric and spectroscopic study of eight semi-detached eclipsing binaries
• Inactive longitude and superflare in the active single-lined pre-main sequence binary V2279 Cyg