000007769 001__ 7769
000007769 005__ 20260108160656.0
000007769 0247_ $$2DOI$$a10.3847/1538-4365/adf1a9
000007769 037__ $$aSCART-2026-0039
000007769 100__ $$aQin, Mingfeng
000007769 245__ $$aPhase II of the LAMOST-Kepler/K2 Survey. II. Time Domain of Medium-resolution Spectroscopic Observations from 2018 to 2023
000007769 260__ $$c2025
000007769 520__ $$aThe LAMOST-Kepler/K2 Medium-Resolution Spectroscopic Survey (LK-MRS) conducted time-domain (TD) medium-resolution spectroscopic observations of 20 LAMOST plates in the Kepler and K2 fields from 2018 to 2023, a phase designated as LK-MRS-I. A catalog of stellar parameters for a total of 36,588 stars, derived from the spectra collected during these 5 yr, including the effective temperature, the surface gravity, the metallicity, the α-element abundance, the radial velocity (RV), and vsini of the target stars, is released, together with the weighted averages and uncertainties. At a signal-to-noise ratio = 10, the measurement uncertainties are 120 K, 0.18 dex, 0.13 dex, 0.08 dex, 1.9 km s‑1, and 4.0 km s‑1 for the above parameters, respectively. Comparisons with the parameters provided by the APOGEE and GALAH surveys validate the effective temperature and surface gravity measurements, showing minor discrepancies in metallicity and α-element abundance values. We identified some peculiar star candidates, including 764 metal-poor stars, 174 very metal-poor stars, and 30 high-velocity stars. Moreover, we found 2333 stars whose RV seems to be variable. Using Kepler/K2 or TESS photometric data, we confirmed 371 periodic variable stars among the RV variable candidates and classified their variability types. LK-MRS-I provides spectroscopic data that is useful for studies of the Kepler and K2 fields. The LK-MRS project will continue collecting TD medium-resolution spectra for target stars during the third phase of LAMOST surveys, providing data to support further scientific research.
000007769 594__ $$aNO
000007769 6531_ $$aSpectroscopy
000007769 6531_ $$aCatalogs
000007769 6531_ $$aSurveys
000007769 6531_ $$aAstronomy databases
000007769 6531_ $$aFundamental parameters of stars
000007769 6531_ $$aSolar and Stellar Astrophysics
000007769 700__ $$aFu, Jian-Ning
000007769 700__ $$aZong, Weikai
000007769 700__ $$aDe Cat, Peter
000007769 700__ $$aFrasca, Antonio
000007769 700__ $$aCang, Tianqi
000007769 700__ $$aWang, Jiangtao
000007769 700__ $$aShi, Jianrong
000007769 700__ $$aLuo, Ali
000007769 700__ $$aZhang, Haotong
000007769 700__ $$aYan, Hongliang
000007769 700__ $$aMolenda-Żakowicz, Joanna
000007769 700__ $$aGray, Richard O.
000007769 700__ $$aWang, Jiaxin
000007769 773__ $$cid.19 (1--14)$$n1$$pThe Astrophysical Journal Supplement Series$$v280$$y2025
000007769 8560_ $$fpeter.decat@ksb-orb.be
000007769 8564_ $$s6527539$$uhttps://publi2-as.oma.be/record/7769/files/Qin2025_ApJS280_19.pdf
000007769 8564_ $$s24532$$uhttps://publi2-as.oma.be/record/7769/files/Qin2025_ApJS280_19.jpg?subformat=icon-180$$xicon-180
000007769 8564_ $$s9954$$uhttps://publi2-as.oma.be/record/7769/files/Qin2025_ApJS280_19.gif?subformat=icon$$xicon
000007769 905__ $$apublished in
000007769 980__ $$aREFERD