A spectroscopic survey of faint, high-galactic latitude red clump stars. II. The medium resolution sample

TL;DR

This survey provides detailed spectroscopic data, including velocities and atmospheric parameters, for faint, high-galactic latitude Red Clump stars, enhancing understanding of their properties and kinematics.

Contribution

It offers the first comprehensive catalog of faint Red Clump stars with multi-epoch radial velocities and atmospheric parameters at medium resolution.

Findings

Achieved high-precision radial velocities with sigma=1.3 km/s

Derived atmospheric parameters with typical uncertainties of 88 K in Teff

Provided spectro-photometric distances and space velocities for 245 stars

Abstract

Aims. The goal of our survey is to provide accurate and multi-epoch radial velocities, atmospheric parameters (Teff, log g and [M/H]), distances and space velocities of faint Red Clump stars. Methods. We recorded high signal-to-noise (S/N >= 200) spectra of Red Clump stars, over the 4750-5950 Ang range, at a resolving power 5500. The target stars are distributed over the great circle of the celestial equator. Radial velocities were obtained via cross-correlation against IAU radial velocity standards. Atmospheric parameters were derived via chi^2 fit to a synthetic spectral library. A large number of RC stars from other surveys were re-observed to check the consistency of our results. Results. A total of 245 Red Clump stars were observed (60 of them with a second epoch observation separated in time by about three months), and the results are presented in an output catalog. None of them is already present in other surveys of Red Clump stars. In addition to astrometric and photometric support data from external sources, the catalog provides radial velocities (accuracy sigma(RV)=1.3 km/s), atmospheric parameters (sigma(Teff)=88 K, sigma(log g)=0.38 dex and sigma([M/H])=0.17 dex), spectro-photometric distances, (X,Y,Z) galacto-centric positions and (U,V,W) space velocities.