Radial Velocities and Pulsation Ephemerides of 11 Field RR Lyrae Stars

TL;DR

This paper provides new radial velocity data and refined pulsation periods for 11 RR Lyrae stars, enhancing understanding of their pulsation behavior through high-resolution spectroscopy.

Contribution

It offers improved pulsation ephemerides and radial velocity measurements for 11 field RR Lyrae stars using extensive high-resolution spectra.

Findings

Radial velocity curves for all stars are presented.

Improved pulsation periods and reference epochs are provided.

Spectroscopic data will enable detailed atmospheric analysis in future work.

Abstract

We present new radial velocities, improved pulsation periods and reference epoch s of 11 field RR Lyrae ab-type variables: AS Vir, BS Aps, CD Vel, DT Hya, RV Oct, TY Gru, UV Oct, V1645 Sgr, WY Ant, XZ Aps and Z Mic. This study is based on high resolution spectra obtained with the echelle spectro graph of the 2.5-m du Pont telescope at Las Campanas Observatory. We obtained ~200 spectra per star (i.e, total of ~2300 spectra) distributed more or less uniformly throughout their pulsation cycles. Radial velocity curves and photometric lightcurves phased to our new ephemerides are presented for all program stars. In a subsequent paper, we will use these spectra to derive stellar atmospheric parameters and chemical compositions throughout the pulsational cycles, based purely on spectroscopic constraints.