000005283 001__ 5283
000005283 005__ 20210208221651.0
000005283 0247_ $$2DOI$$a10.3847/1538-4365/abbb2d
000005283 037__ $$aSCART-2021-0063
000005283 100__ $$aZong, W.K.
000005283 245__ $$aPhase II of the LAMOST-Kepler/K2 Survey. I. Time Series of Medium-resolution Spectroscopic Observations
000005283 260__ $$c2020
000005283 520__ $$aPhase 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 50,000 stars with multiple visits (∼60 epochs) over a period of 5 yr (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 ∼280,000 and ∼369,000 high-quality spectra in the blue and red wavelength ranges, respectively. The atmospheric parameters and radial velocities for ∼259,000 spectra of 21,053 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 100 K, 0.15 dex, 0.09 dex, and 1.00 km s-1, 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 14,997, 20,091, 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 0.73 km s-1, 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. 
000005283 594__ $$aNO
000005283 6531_ $$aCatalogs
000005283 6531_ $$aSpectroscopy
000005283 6531_ $$aSurveys
000005283 6531_ $$aFundamental parameters of stars
000005283 6531_ $$aAstrostatistics
000005283 6531_ $$aAstronomy databases
000005283 700__ $$aFu, J.-N.
000005283 700__ $$aDe Cat, P.
000005283 700__ $$aWang, J.X.
000005283 700__ $$aShi, J.R.
000005283 700__ $$aLuo, A.L.
000005283 700__ $$aZhang, H.T.
000005283 700__ $$aFrasca, A.
000005283 700__ $$aMolenda-Żakowicz, J.
000005283 700__ $$aGray, R.O.
000005283 700__ $$aCorbally, C.J.
000005283 700__ $$aCatanzaro, G.
000005283 700__ $$aCang, T.Q.
000005283 700__ $$aWang, J.T.
000005283 700__ $$aChen, J.J.
000005283 700__ $$aHou, Y.H.
000005283 700__ $$aLiu, J.M.
000005283 700__ $$aNiu, H.B.
000005283 700__ $$aPan, Y.
000005283 700__ $$aTian, H.
000005283 700__ $$aYan, H.L.
000005283 700__ $$aZhang, Y.
000005283 700__ $$aZuo, H.
000005283 773__ $$c id.15, 18 pp.$$n1$$p The Astrophysical Journal Supplement Series$$v251$$y2020
000005283 8560_ $$fpeter.decat@observatoire.be
000005283 905__ $$apublished in
000005283 980__ $$aREFERD