LAMOST observations in the Kepler field. Database of low-resolution spectra

TL;DR

This paper presents a database of low-resolution spectra obtained with LAMOST for stars in the Kepler field, aiding in the determination of stellar parameters essential for asteroseismic studies.

Contribution

It provides a comprehensive spectral database for Kepler field stars, improving the accuracy of stellar parameter estimates for asteroseismic research.

Findings

Collected low-resolution spectra for Kepler field stars

Established a publicly accessible spectral database

Enhanced stellar parameter estimation accuracy

Abstract

The nearly continuous light curves with micromagnitude precision provided by the space mission Kepler are revolutionising our view of pulsating stars. They have revealed a vast sea of low-amplitude pulsation modes that were undetectable from Earth. The long time base of Kepler light curves allows an accurate determination of frequencies and amplitudes of pulsation modes needed for in-depth asteroseismic modeling. However, for an asteroseismic study to be successful, the first estimates of stellar parameters need to be known and they can not be derived from the Kepler photometry itself. The Kepler Input Catalog (KIC) provides values for the effective temperature, the surface gravity and the metallicity, but not always with a sufficient accuracy. Moreover, information on the chemical composition and rotation rate is lacking. We are collecting low-resolution spectra for objects in the Kepler field of view with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, Xinglong observatory, China). All of the requested fields have now been observed at least once. In this paper we describe those observations and provide a database of use to the whole astronomical community.