J/AJ/142/187ivo://CDS.VizieR/J/AJ/142/187doi:10.26093/cds/vizier.51420187CDSBenedict G.F.McArthur B.E.Feast M.W.Barnes T.G.Harrison T.E.,Bean J.L.Menzies J.W.Chaboyer B.Fossati L.Nesvacil N.Smith H.A.,Kolenberg K.Laney C.D.Kochukhov O.Nelan E.P.Shulyak D.V.,Taylor D.Freedman W.L.2017-10-12T13:00:14Z2013-04-08T10:23:09ZCDS support team

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

cds-question@unistra.frvariable-starshst-photometrypopulation-ii-starsWe present new absolute trigonometric parallaxes and proper motions for seven Population II variable stars - five RR Lyr variables: RZ Cep, XZ Cyg, SU Dra, RR Lyr, and UV Oct; and two type 2 Cepheids: VY Pyx and {kappa} Pav. We obtained these results with astrometric data from Fine Guidance Sensors, white-light interferometers on Hubble Space Telescope. We find absolute parallaxes in milliseconds of arc: RZ Cep, 2.12+/-0.16mas; XZ Cyg, 1.67+/-0.17mas; SU Dra, 1.42+/-0.16mas; RR Lyr, 3.77+/-0.13mas; UV Oct, 1.71+/-0.10mas; VY Pyx, 6.44+/-0.23mas; and {kappa} Pav, 5.57+/-0.28mas; an average {sigma}_{pi}_/{pi}=5.4%. With these parallaxes, we compute absolute magnitudes in V and K bandpasses corrected for interstellar extinction and Lutz-Kelker-Hanson bias. Using these RR Lyrae variable star absolute magnitudes, we then derive zero points for M_V_-[Fe/H] and M_K_-[Fe/H]-logP relations. The technique of reduced parallaxes corroborates these results. We employ our new results to determine distances and ages of several Galactic globular clusters and the distance of the Large Magellanic Cloud. The latter is close to that previously derived from Classical Cepheids uncorrected for any metallicity effect, indicating that any such effect is small. We also discuss the somewhat puzzling results obtained for our two type 2 Cepheids.2011AJ....142..187Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/142/187CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2012)B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)B/hst : HST Archived Exposures Catalog (STScI, 2007)I/254 : The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)J/A+A/330/515 : RR Lyrae parallaxes + proper motions (Fernley+, 1998)J/MNRAS/386/2115 : Type II Cepheid and RR Lyrae variables (Feast+, 2008)J/MNRAS/396/553 : Galactic RR Lyrae data (Dambis, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/142/187https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/142/187http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/142/187https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/142/187https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/142/187http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/142/187GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/142/187/table1 (Target Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/142/187/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/142/187/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/142/187/table1?GETtext/xml+votable180.050000true339.804907264.85850110.0055555555555555566/7518 15106 15220 15714 40167 40988 457207.952274030004205e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/142/187?format=asciiOpticaldefaultJ/AJ/142/187/table1Target PropertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSources (RRLs or type 2 Cepheids)meta.idprimaryTypeVariable type (ab/c for RR Lyr or BLHer, WVir)meta.code;src.varcharRef[c-i] References and notes (1)meta.refcharlogP[-0.51052/0.95815] Log of the pulsational periodmeta.notedoublePPeriod (computed from logP)dtime.perioddoublenullableT0[50749.2/54793.01] Epoch of observationdtime.epochdouble<Vmag>[4.35/9.78] Mean HST V band magnitudemagphot.mag;em.opt.Vfloat<Ksmag>[2.78/8.72] Mean Ks band magnitude (2)magphot.mag;em.IR.Kfloat[Fe/H][-1.8/0] Metallicity (3)phys.abund.Zfloate_[Fe/H]Fe/H abundance uncertaintystat.error;phys.abund.FefloatAv[0.03/0.78] V-band absorptionmagphys.absorptionfloatAk? K-band absorptionmagphys.absorptionfloatnullable2MDisplay the 2MASS data within 1" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainLCLight Curvemeta.ref.urlcharJ/AJ/142/187/table2Log of observations, apparent magnitude, estimated B-V, and pulsational phaserecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSources (RRLs or type 2 Cepheids)meta.idSet[1/23] Set (1)meta.noteintMJD[49984.2/55351.4] Modified Julian Date (JD-2400000.5)time.epochdoubleVmag[3.961/10.214] HST V band magnitudemagphot.mag;em.opt.VfloatB-VEstimated B-V color index (2)magphot.color;em.opt.B;em.opt.VfloatPhasePulsational phasetime.phasefloat