TEMPLATE RR LYRAE Hα, Hβ, AND Hγ VELOCITY CURVES

We present template radial velocity curves of $ab$-type RR Lyrae stars constructed from high-precision measurements of ${\rm H\alpha}$, ${\rm H\beta}$, and ${\rm H\gamma}$ lines. Amplitude correlations between the Balmer line velocity curves, Johnson $V$-band, and SDSS $g$- and $r$-band light curves are also derived. Compared to previous methods, these templates and derived correlations reduce the uncertainty in measured systemic (center-of-mass) velocities of RR Lyrae stars by up to 15 {\kms}, and will be of particular interest to wide-area spectroscopic surveys such as the Sloan Digital Sky Survey (SDSS) and LAMOST Experiment for Galactic Understanding and Exploration (LEGUE).

[1]  S. Blažko,et al.  Mitteilungen über veränderliche Sterne , 1907 .

[2]  James E. Gunn,et al.  AN EFFICIENT LOW RESOLUTION AND MODERATE RESOLUTION SPECTROGRAPH FOR THE HALE TELESCOPE , 1982 .

[3]  T. Beers,et al.  PROPER MOTIONS IN KAPTEYN SELECTED AREA 103: A PRELIMINARY ORBIT FOR THE VIRGO STELLAR STREAM , 2009, 0907.1249.

[4]  A. K. Vivas,et al.  The QUEST RR Lyrae Survey: Confirmation of the Clump at 50 Kiloparsecs and Other Overdensities in the Outer Halo , 2001, astro-ph/0105135.

[5]  Multiperiodic Galactic field RR Lyrae stars in the ASAS catalogue , 2007, astro-ph/0701068.

[6]  A. Layden.  The metallicities and kinematics of RR Lyrae variables, 1: New observations of local stars , 1994 .

[7]  Tianxing Liu.  SYNTHETIC RR LYRAE VELOCITY CURVES , 1991 .

[8]  B. Schmidt,et al.  Revealing Substructure in the Galactic Halo: The SEKBO RR Lyrae Survey , 2007, 0711.2337.

[9]  Ž. Ivezić,et al.  SPECTROSCOPIC CONFIRMATION OF THE PISCES OVERDENSITY , 2009, 0908.1381.

[10]  George W. Preston,et al.  RADIAL VELOCITIES AND PULSATION EPHEMERIDES OF 11 FIELD RR Lyrae STARS , 2011, 1104.2668.

[11]  E. al.,et al.  The Sloan Digital Sky Survey: Technical summary , 2000, astro-ph/0006396.

[12]  Horace A. Smith,et al.  RR Lyrae Stars , 1995 .

[13]  Mamoru Doi,et al.  Exploring the Variable Sky with the Sloan Digital Sky Survey , 2007, 0704.0655.

[14]  G. Preston.  RR LYRAE ATMOSPHERICS: WRINKLES OLD AND NEW. A PREVIEW , 2010, 1008.4618.

[15]  Harland W. Epps,et al.  THE KECK LOW-RESOLUTION IMAGING SPECTROMETER , 1995 .

[16]  Ernest E. Croner,et al.  The Palomar Transient Factory: System Overview, Performance, and First Results , 2009, 0906.5350.

[17]  Andrew Cameron Becker,et al.  SIMULATED LSST SURVEY OF RR LYRAE STARS THROUGHOUT THE LOCAL GROUP , 2012 .

[18]  S. Hawley,et al.  RADIAL VELOCITIES OF RR LYRAE STARS. , 1985 .

[19]  J. B. Oke.  A Spectrophotometric Study of X ARIETIS , 1966 .

[20]  A. Katherina Vivas,et al.  VLT Spectroscopy of RR Lyrae Stars in the Sagittarius Tidal Stream , 2004, astro-ph/0410131.

[21]  Zeljko Ivezic,et al.  Sloan Digital Sky Survey Standard Star Catalog for Stripe 82: The Dawn of Industrial 1% Optical Photometry , 2007, astro-ph/0703157.

[22]  Ž. Ivezić,et al.  HALO VELOCITY GROUPS IN THE PISCES OVERDENSITY , 2010, 1005.0575.

[23]  Eduardo Serrano,et al.  LSST: From Science Drivers to Reference Design and Anticipated Data Products , 2008, The Astrophysical Journal.

[24]  S. Majewski,et al.  PROBING THE HALO FROM THE SOLAR VICINITY TO THE OUTER GALAXY: CONNECTING STARS IN LOCAL VELOCITY STRUCTURES TO LARGE-SCALE CLOUDS , 2012, 1202.5311.

[25]  J. S. Stuart,et al.  EXPLORING THE VARIABLE SKY WITH LINEAR. I. PHOTOMETRIC RECALIBRATION WITH THE SLOAN DIGITAL SKY SURVEY , 2011, 1109.5227.

[26]  Heidelberg,et al.  Substructure revealed by RR Lyraes in SDSS Stripe 82 , 2009, 0906.0498.

[27]  S. Hawley,et al.  Evidence for Distinct Components of the Galactic Stellar Halo from 838 RR Lyrae Stars Discovered in the LONEOS-I Survey , 2007, 0706.1583.

[28]  D. Bramich,et al.  CCD time-series photometry of the globular cluster NGC 5053: RR Lyrae, Blue Stragglers and SX Phoenicis stars revisited , 2009, 0910.2068.

[29]  Andrew McWilliam,et al.  RR Lyrae Stars, Metal-Poor Stars, and the Galaxy , 2011, 1109.1324.

[30]  Benjamin A. Willett,et al.  THE ORIGIN OF THE VIRGO STELLAR SUBSTRUCTURE , 2012, 1205.2371.

[31]  Heidi Jo Newberg,et al.  LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) — The survey's science plan , 2012, 1206.3578.

[32]  J. B. Oke,et al.  An Analysis of the Absolute Energy Distribution in the Spectrum of SU Draconis. , 1962 .

[33]  Linhua Jiang,et al.  LIGHT CURVE TEMPLATES AND GALACTIC DISTRIBUTION OF RR LYRAE STARS FROM SLOAN DIGITAL SKY SURVEY STRIPE 82 , 2009, 0910.4611.

[34]  S. Prior,et al.  EXTENDING THE VIRGO STELLAR STREAM WITH SEKBO SURVEY RR LYRAE STARS , 2008, 0810.0057.

[35]  E. O. Ofek,et al.  TWO DISTANT HALO VELOCITY GROUPS DISCOVERED BY THE PALOMAR TRANSIENT FACTORY , 2012, 1206.0269.