LAMOST observations in the Kepler field. II. Database of the low-resolution spectra from the five-year regular survey

TL;DR

This paper presents the second data release of the LAMOST-Kepler project, providing a large database of low-resolution spectra and derived stellar parameters for over 126,000 stars in the Kepler field, facilitating diverse astronomical research.

Contribution

It offers a comprehensive spectroscopic database with atmospheric parameters for Kepler field stars, derived from five years of LAMOST observations, including nearly 228,000 spectra.

Findings

Coverage of 14 subfields in the Kepler field with over 227,000 spectra.

Derived atmospheric parameters and radial velocities for 173,971 spectra.

Nearly 50% of targets observed by both LAMOST and Kepler, enabling combined analyses.

Abstract

The LAMOST-Kepler (LK-) project was initiated to use the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) to make spectroscopic follow-up observations for the targets in the field of the Kepler mission. The Kepler field is divided into 14 subfields that are adapted to the LAMOST circular field with a diameter of 5 degrees. During the regular survey phase of LAMOST, the LK-project took data from 2012 June to 2017 June and covered all the 14 subfields at least twice. In particular, we describe in this paper the second Data Release of the LK-project, including all spectra acquired through 2015 May to 2017 June together with the first round observations of the LK-project from 2012 June to 2014 September. The LK-project now counts 227 870 spectra of 156 390 stars, among which we have derived atmospheric parameters (log g, T eff and [Fe/H]) and heliocentric radial velocity (RV) for 173 971 spectra of 126 172 stars. These parameters were obtained with the most recent version of the LAMOST Stellar Parameter Pipeline v 2.9.7. Nearly one half, namely 76 283 targets, are observed both by LAMOST and Kepler telescopes. These spectra, establishing a large spectroscopy library, will be useful for the entire astronomical community, particularly for planetary science and stellar variability on Kepler targets.