Radial Velocities and Pulsation Ephemerides of 11 Field RR Lyrae Stars

Details Radial Velocities and Pulsation Ephemerides of 11 Field RR Lyrae Stars Radial Velocities and Pulsation Ephemerides of 11 Field RR Lyrae Stars

2011-04-14

arxiv.org/abs/1104.2668v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

28 pages, 14 figures, 5 tables. Accepted for publication in ApJS

Scientific paper

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.

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