Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 194, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/194/2/38
Keywords
stars: horizontal-branch; stars: Population II; stars: variables: RR Lyrae; techniques: radial velocities
Categories
Funding
- SigmaXi
- U.S. National Science Foundation [AST-0908978]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0908978] Funding Source: National Science Foundation
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We present new radial velocities (RVs), improved pulsation periods, and reference epochs 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 spectrograph of the 2.5 m du Pont telescope at Las Campanas Observatory. We obtained similar to 200 spectra per star (i.e., a total of similar to 2300 spectra), distributed more or less uniformly throughout their pulsation cycles. RV curves and photometric light curves 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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