J/ApJ/848/68ivo://CDS.VizieR/J/ApJ/848/68doi:10.26093/cds/vizier.18480068CDSSneden C.Preston G.W.Chadid M.Adamow M.2019-02-27T06:15:45Z2019-02-26T08:09:13ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starsradial-velocitychemical-abundancesvisible-astronomyWe analyzed series of spectra obtained for 12 stable RRc stars observed with the echelle spectrograph of the du Pont telescope at Las Campanas Observatory and we analyzed the spectra of RRc Blazhko stars discussed by Govea+ (2014, J/ApJ/782/59). We derived model atmosphere parameters, [Fe/H] metallicities, and [X/Fe] abundance ratios for 12 species of 9 elements. We co-added all spectra obtained during the pulsation cycles to increase signal to noise and demonstrate that these spectra give results superior to those obtained by co-addition in small phase intervals. The RRc abundances are in good agreement with those derived for the RRab stars of Chadid+ (2017ApJ...835..187C). We used radial velocity (RV) measurements of metal lines and H{alpha} to construct variations of velocity with phase, and center-of-mass velocities. We used these to construct RV templates for use in low- to medium-resolution RV surveys of RRc stars. Additionally, we calculated primary accelerations, radius variations, and metal and H{alpha} velocity amplitudes, which we display as regressions against primary acceleration. We employ these results to compare the atmosphere structures of metal-poor RRc stars with their RRab counterparts. Finally, we use the RV data for our Blazhko stars and the Blazhko periods of Szczygiel & Fabrycky (2007, J/MNRAS/377/1263) to falsify the Blazhko oblique rotator hypothesis.2017ApJ...848...68Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/848/68CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)J/ApJS/219/25 : LCs of RR Lyrae stars in M3 (NGC5272) (Jurcsik+, 2015)J/AcA/64/177 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2014)J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)J/ApJ/782/59 : Abundances of 8 RR Lyrae subclass C stars (Govea+, 2014)J/MNRAS/427/3374 : QUEST RR Lyrae Survey III. Low Galactic lat. (Mateu+, 2012)J/AJ/144/114 : Radial velocities of 6 field RR Lyrae (Sesar+, 2012)J/ApJS/197/29 : Chemical compositions of 11 RR Lyrae (For+, 2011)J/ApJS/194/38 : Radial velocities of 11 field RR Lyrae (For+, 2011)J/MNRAS/377/1263 : Multiperiodic RR Lyrae in ASAS catalog (Szczygiel+, 2007)J/MNRAS/372/69 : VR light curves of M2 variables (Lazaro+, 2006)J/A+A/330/515 : RR Lyrae parallaxes + proper motions (Fernley+ 1998)J/A+AS/125/313 : RR Lyrae radial velocities and [Fe/H] I. (Fernley+ 1997)J/A+AS/125/321 : RR Lyrae radial velocities and [Fe/H] II. (Solano+ 1997)J/AJ/110/1186 : SX Phe stars in NGC 5053 (Nemec+ 1995)J/AJ/108/1016 : Kinematics of local RR lyrae stars. I. (Layden, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/848/68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/848/68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/848/68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/848/68https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/848/68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/848/68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/848/68/table1RR Lyrae program star dataPer[0.2/0.4] Period (2)dtime.perioddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRRcRRc sample, 1:Stable RRc, 2: Blazhko RRcsrc.sampleintASASAll Sky Automated identifier, HHMMSS+DDMM.m (J2000), Pojmanski (2003, II/264)meta.id;meta.maincharNameShortened ASAS name used in text and other tablesmeta.idcharprimaryONameOther Namemeta.idchar[Fe/H][-2.7/-0.9] Mean metallicity (1)log(Sun)phys.abund.Z;stat.meanfloatHJD0Epoch of light minimum, HJD-2450000 (2)dtime.epochdoubleVmin[8.7/12.8] V band brightness at minimummagphot.mag;em.opt.VfloatVampAmplitude of V band variationmagarith.rate;phot.mag;em.opt.VfloatRVamp? Radial velocity amplitude of metal lineskm/ssrc.var.amplitudefloatnullableNrvNumber of radial velocity measurements for this star (table 2)meta.numberintnullableBCatDisplay data from Govea+ (2014, J/ApJ/782/59) and Szczygiel+ (2007, J/MNRAS/377/1263) for this Blazhko starmeta.ref.urlintnullableNpNumber of abundance measurements for this star (table 4)meta.numberintnullableVPVelocity Plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/848/68/table2Radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameAbbreviated ASAS star namemeta.id;meta.maincharFileObserved file namemeta.id;meta.filecharHJDHeliocentric Julian Date; HJD-2450000dtime.epochdoublephiPulsational phasetime.phase;phys.veloc.pulsatfloatRVm[-162.4/226.3] Radial velocity of the metal lineskm/sspect.dopplerVelocfloatRVHa[-178.1/235.7] Radial velocity of H{alpha}km/sspect.dopplerVelocfloatJ/ApJ/848/68/table4Stellar parameters from phased-averaged spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameAbbreviated ASAS star namemeta.id;meta.maincharphiPulsational phase of observationmeta.notedoubleNsp[2/15] Number of spectra co-added at this phasemeta.numberintTeff[6550/7800] Effective temperatureKphys.temperature.effectiveintlog(g)[1.6/4] Logarithm of surface gravitylog(cm.s**-2)phys.gravityfloat[M/H][-2.8/2.6] Metallicity of the model atmospherelog(Sun)phys.abund.Z;meta.modelledfloatxi[1/3.5] Microturbulent velocitykm/sphys.velocfloat[Fe/H]I[-3/-0.9] Fe I abundancelog(Sun)phys.abund.Fefloate_[Fe/H]I[0.1/0.6] Sample standard deviation for Fe I abundancelog(Sun)stat.error;phys.abund.Fefloato_[Fe/H]I[6/113] Number of lines contributing to FeI abundancemeta.numberint[Fe/H]II[-3/-0.9] Fe II abundancelog(Sun)phys.abund.Fefloate_[Fe/H]II[0.1/0.5] Sample standard deviation for FeII abundancelog(Sun)stat.error;phys.abund.Fefloato_[Fe/H]II[3/39] Number of lines contributing to FeII abundancemeta.numberint