J/MNRAS/398/1757ivo://CDS.VizieR/J/MNRAS/398/1757doi:10.26093/cds/vizier.73981757CDSWatkins L.L.Evans N.W.Belokurov V.Smith M.C.Hewett P.C.,Bramich D.M.Gilmore G.F.Irwin M.J.Vidrih S.Wyrzykowski L.,Zucker D.B.2024-07-09T20:15:42Z2015-10-05T15:44:17ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomysloan-photometryWe present an analysis of the substructure revealed by RR Lyraes in Sloan Digital Sky Survey Stripe 82, which covers 2.5{deg} in declination on the celestial equator over the right ascension range {alpha}=20.7h to 3.3h. We use the new public archive of light-motion curves in Stripe 82, published by Bramich et al. in 2008 (Cat. V/141), to identify a set of high-quality RR Lyrae candidates. Period estimates are determined to high accuracy using a string-length method. A subset of 178 RR Lyraes with spectrally derived metallicities are employed to derive metallicity-period-amplitude relations, which are then used, together with archive magnitude data and light-curve Fourier decomposition, to estimate metallicities and hence distances for the entire sample. The RR Lyraes lie 5-115kpc from the Galactic Centre, with distance estimates accurate to ~8%. The RR Lyraes are further divided into subsets of 316 RRab types and 91 RRc types based on their period, colour and metallicity. We fit a smooth density law to the distribution as a simple representation of the data. For Galactocentric radii 5-25kpc the number density of RR Lyraes falls as r^-2.4^, but beyond 25kpc, the number density falls much more steeply, as r^-4.5^. However, we stress that in practice the density distribution is not smooth, but dominated by clumps and substructure. Samples of 55 and 237 RR Lyraes associated with the Sagittarius Stream and the Hercules-Aquila Cloud, respectively, are identified. Hence, ~70% of the RR Lyraes in Stripe 82 belong to known substructure, and the sharp break in the density law reflects the fact that the dominant substructure in Stripe 82 - the Hercules-Aquila Cloud and the Sagittarius Stream - lie within 40kpc. In fact, almost 60% of all the RR Lyraes in Stripe 82 are associated with the Hercules-Aquila Cloud alone, which emphasizes the cloud's pre-eminence. Additionally, evidence of a new and distant substructure - the Pisces Overdensity - is found, consisting of 28 faint RR Lyraes centred on Galactic coordinates (l~80{deg}, b~-55{deg}), with distances of ~80kpc. The total stellar mass in the Pisces Overdensity is ~10^4^M_{sun}_ and its metallicity is [Fe/H]~-1.5.2009MNRAS.398.1757Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/398/1757CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/141 : Light-Motion Curve Catalogue (LMCC) in Stripe 82 (Bramich+ 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/398/1757https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/398/1757http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/398/1757https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/398/1757https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/398/1757http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/398/1757GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/398/1757/vars (Variable star-like objects in SDSS Stripe 82)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/398/1757/vars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/398/1757/vars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/398/1757/vars?GETtext/xml+votable180.050000true0.0079170.4236110.005555555555555556Cone search capability for table J/MNRAS/398/1757/lyraes (RR Lyraes in SDSS Stripe 82)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/398/1757/lyraes?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/398/1757/lyraes?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/398/1757/lyraes?GETtext/xml+votable180.050000true310.6991670.0644440.0055555555555555564/1126 1129 1190 1193 1877 5/4351 4436-4438 4441-4442 4444 4451-4454 4457-4458 4460 4501-4502 4521-4522 4544 4687 4693-4694 4696-4698 4707 4709-4710 4713-4714 4756-4758 4764 4777-4778 4780 4800 4864 5801-5802 6/0-2 4 12288-12290 17659 17661-17663 17723 17725-17727 17741-17743 17756-17758 17761-17763 17772-17774 17803 17820-17822 17825-17827 17836-17838 17848 17856-17858 17860 17981-17983 17997-17999 18001-18003 18012-18014 18032-18034 18040 18055 18061-18063 18081-18083 18092-18094 18096-18098 18112-18114 18184 18679 18685-18687 18743 18747 18763 18765-18767 18769-18771 18780-18782 18796-18798 18800-18802 18804 18808 18823 18833-18835 18844-18846 18849-18851 18860-18862 18864-18866 18868 18880-18882 18884 19003 19005-19007 19021-19023 19036-19038 19083 19085-19087 19105-19107 19116-19118 19128 19136-19138 19144 19464 23182 23201-23203 23212-23214 23218 23224 30023 30029 30065 30068 36861-36863 49149-49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/398/1757?format=asciiOpticaldefaultJ/MNRAS/398/1757/varsVariable star-like objects in SDSS Stripe 82recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRRSimbad column added by the CDSmeta.ref.urlcharLCLightcurve name (in the LMCC and HLC from Bramich et al. 2008MNRAS.386..887B, Cat. V/141)meta.id;meta.filecharprimaryB08Display the Bramich et al. 2008 (V/141) datameta.ref.urlcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainumagApparent u band magnitudemagphot.mag;em.opt.Ufloate_umagUncertainty in umagmagstat.error;phot.mag;em.opt.UfloatgmagApparent g band magnitudemagphot.mag;em.opt.Bfloate_gmagUncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatrmagApparent r band magnitudemagphot.mag;em.opt.Rfloate_rmagUncertainty in rmagmagstat.error;phot.mag;em.opt.RfloatimagApparent i band magnitudemagphot.mag;em.opt.Ifloate_imagUncertainty in imagmagstat.error;phot.mag;em.opt.IfloatzmagApparent z band magnitudemagphot.mag;em.opt.Ifloate_zmagUncertainty in zmagmagstat.error;phot.mag;em.opt.IfloatPer[0.21/0.82]? Period of variability (1)dtime.periodfloatnullableJ/MNRAS/398/1757/lyraesRR Lyraes in SDSS Stripe 82AssocAssociation (1)meta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCLightcurve name (in the LMCC and HLC from Bramich et al. 2008MNRAS.386..887B, Cat. V/141)meta.id;meta.filecharB08Display the Bramich et al. 2008 (V/141) datameta.ref.urlcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainumagApparent u-band magnitudemagphot.mag;em.opt.Ufloate_umagUncertainty in umagmagstat.error;phot.mag;em.opt.UfloatgmagApparent g-band magnitudemagphot.mag;em.opt.Bfloate_gmagUncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatrmagApparent r-band magnitudemagphot.mag;em.opt.Rfloate_rmagUncertainty in rmagmagstat.error;phot.mag;em.opt.RfloatimagApparent i-band magnitudemagphot.mag;em.opt.Ifloate_imagUncertainty in imagmagstat.error;phot.mag;em.opt.IfloatzmagApparent z-band magnitudemagphot.mag;em.opt.Ifloate_zmagUncertainty in zmagmagstat.error;phot.mag;em.opt.IfloatPer[0.21/0.82] Period of variabilitydtime.periodfloatRRRR Lyrae type (ab or c)meta.code;src.varchargAmp[0.1/0.8] g-band amplitudemagsrc.var.amplitudefloatrAmp[0.1/0.6] r-band amplitudemagsrc.var.amplitudefloat[Fe/H][-3.1/-0.8] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.2/0.9] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.FefloatzMAG[0.11/1.1] z-band absolute magnitudemagphys.magAbsfloatDist[4/108] Heliocentric distancekpcpos.distancefloate_Dist[0.1/58] Uncertainty in Distkpcstat.errorfloatgcsq[19/2006] g-band {chi}-squaredphot.mag;em.opt.Bfloatrcsq[8.67/1494.85] r-band {chi}-squaredphot.mag;em.opt.Rfloatgrms[0.1/0.56] g-band RMSmagstat.stdev;phot.magfloatrrms[0.07/0.41] r-band RMSmagstat.errorfloatLg[2.56/33.92] g-band Stetson indexsrc.var.indexfloatSimbadNameSimbad column added by the CDSmeta.idchar