J/AJ/157/153ivo://CDS.VizieR/J/AJ/157/153doi:10.26093/cds/vizier.51570153CDSPreston G.W.Sneden C.Chadid M.Thompson I.B.Shectman S.A.2019-11-12T13:35:07Z2019-08-06T07:03:49ZCDS support team

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

cds-question@unistra.frvariable-starshorizontal-branch-starsmetallicityeffective-temperaturevisible-astronomyspectroscopyline-intensitiesWe have derived relations between FWHMs and equivalent widths of metallic absorption lines in the spectra of RR Lyrae stars to estimate new upper limits on the axial equatorial rotational velocities of RR Lyrae and metal-poor red horizontal branch (RHB) stars. We have also derived the variations of RR Lyrae macroturbulent velocities during the pulsation cycles. In RRab cycles, the line widths are dominated by phase-dependent convolutions of axial rotation and macroturbulence, which we designate as V_macrot_. The behavior of V_macrot_ is remarkably uniform among the RRab stars, but the behavior of V_macrot_ among RRc stars varies strongly from star to star. The RRab stars exhibit an upper limit on V_macrot_ of 5+/-1 km/s with weak evidence of an anticorrelation with T_eff_. The RRc minima range from 2 to 12 km/s. The abrupt decline in large rotations with decreasing T_eff_ at the blue boundary of the instability strip and the apparently smooth continuous variation among the RRab and RHB stars suggests that HB stars gain/lose surface angular momentum on timescales that are short compared to HB lifetimes. The V_macrot_ values for our metal-poor RHB stars agree well with those derived by Fourier analysis of an independent but less metal-poor sample of Carney et al. (2008AJ....135..892C); they conform qualitatively to the expectations of Tanner et al. (2013ApJ...778..117T). A general conclusion of our investigation is that surface angular momentum as measured by V_rot_sin(i) is not a reliable indicator of total stellar angular momentum anywhere along the HB.2019AJ....157..153Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/157/153CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/132/85 : Equivalent width of 33 metal-poor RHB (Preston+, 2006)J/MNRAS/377/1263 : Multiperiodic RR Lyrae in ASAS catalog (Szczygiel+, 2007)J/ApJS/194/38 : Radial velocities of 11 field RR Lyrae (For+, 2011)J/ApJS/197/29 : Chemical compositions of 11 RR Lyrae (For+, 2011)J/A+A/562/A90 : Times of maximum light of Blazhko RRab stars (Skarka, 2014)J/MNRAS/445/1584 : AB-type RR Lyrae stars from ASAS and WASP (Skarka, 2014)J/MNRAS/447/2404 : Equivalent width of 21 RR Lyrae stars (Pancino+, 2015)J/ApJ/848/68 : Abundances & RVs of stable and Blazhko RRc starsJ/AJ/155/45 : Metal-rich RRc stars in the Carnegie RR Lyrae Surveyhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/157/153https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/157/153http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/157/153https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/157/153https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/157/153http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/157/153GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/157/153/table1 (The stellar sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/157/153/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/157/153/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/157/153/table1?GETtext/xml+votable180.050000true154.0206078-29.72844890.0055555555555555566/110 8367 8466 12512 12743 16462 16923 18177 18580 19110 24724 24913 25060 25120 25199 25611 25768 25803 25879 25953 26281 26807 26981 27148 27333 27824 30923 31390 31498 31608 31648 31743 33465 34232 34537 34600 35151 35686 36295 36605 38456 38809 39152 40988 40998 41022 41260 42260 45801 45868 45881 45994 46069 46080 46580 46691 46705 46751 46851 47217 47342 47467 48145 48160 48162 48228 48363 48544 48715 48911 48916https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/157/153?format=asciiOpticaldefaultJ/AJ/157/153/table1The stellar sampleSimbadNameSimbad column added by the CDSmeta.idcharStarStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupStar group (MP=metal-poor; MR=metal-rich)meta.idcharn_Group[bd] Note on Group (1)meta.notecharn_Star[c] Note on Star (2)meta.notechar[Fe/H][-2.92/-0.05]? Metallicityphys.abund.ZfloatnullablePer[0.235934/0.746568]? Perioddtime.perioddoublenullableHJD0[1869.25/5455.46]? Heliocentric Julian Date at maximum light (HJD-2450000)dtime.epochdoublenullableVmax[8.8/15.1] V magnitude at maximum lightmagphot.mag;em.opt.Vfloatlog(Teff)[3.728/3.851]? Log effective temperature (3)log(K)phys.temperature.effectivefloatnullableFWHMavg[4.8/25.1] Average full-width at half-maximum of unsaturated lines FWHM_unsat_km/sspect.line.widthfloate_FWHMavg[0.02/2]? Uncertainty in FWHMavgkm/sstat.errorfloatnullableVmacavg[1.3/12.1] Average macroturbulent velocity V_macrot_km/sphys.velocfloate_Vmacavg[0.02/1.28]? Uncertainty in Vavgkm/sstat.errorfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/157/153/table2Atomic linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[4045.82/5302.31] Wavelength {lambda} ({AA})0.1nmem.wlfloatIonAtomic identificationphys.atmol.ionStagecharEW[33/1584] Equivalent width in the Sun (m{AA}) (1)1e-13mspect.line.eqWidthint