J/ApJ/776/26ivo://CDS.VizieR/J/ApJ/776/26doi:10.26093/cds/vizier.17760026CDSSesar B.Grillmair C.J.Cohen J.G.Bellm E.C.Bhalerao V.B.,Levitan D.Laher R.R.Ofek E.O.Surace J.A.Tang S.Waszczak A.,Kulkarni S.R.Prince T.A.2017-10-12T13:00:35Z2015-04-21T14:18:25ZCDS support team

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

cds-question@unistra.frstellar-distancevariable-starsradial-velocityproper-motionsextinctionWe report positions, velocities, and metallicities of 50 ab-type RR Lyrae (RRab) stars observed in the vicinity of the Orphan stellar stream. Using about 30 RRab stars classified as being likely members of the Orphan stream, we study the metallicity and the spatial extent of the stream. We find that RRab stars in the Orphan stream have a wide range of metallicities, from -1.5dex to -2.7dex. The average metallicity of the stream is -2.1dex, identical to the value obtained by Newberg et al. (2010ApJ...711...32N) using blue horizontal branch stars. We find that the most distant parts of the stream (40-50kpc from the Sun) are about 0.3dex more metal-poor than the closer parts (within ~30kpc), suggesting a possible metallicity gradient along the stream's length. We have extended the previous studies and have mapped the stream up to 55kpc from the Sun. Even after a careful search, we did not identify any more distant RRab stars that could plausibly be members of the Orphan stream. If confirmed with other tracers, this result would indicate a detection of the end of the leading arm of the stream. We have compared the distances of Orphan stream RRab stars with the best-fit orbits obtained by Newberg et al. We find that model 6 of Newberg et al. cannot explain the distances of the most remote Orphan stream RRab stars, and conclude that the best fit to distances of Orphan stream RRab stars and to the local circular velocity is provided by potentials where the total mass of the Galaxy within 60kpc is M_60_~2.7x10^11^M_{sun}_, or about 60% of the mass found by previous studies. More extensive modeling that would consider non-spherical potentials and the possibility of misalignment between the stream and the orbit is highly encouraged.2013ApJ...776...26Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/776/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/313 : Palomar Transient Factory (PTF) photometric catalog 1.0 (Ofek+, 2012)III/176 : RR Lyrae Metallicities (Layden 1994)J/AJ/146/21 : LINEAR. II. Catalog of RR Lyrae stars (Sesar+, 2013)J/ApJ/765/154 : RR Lyrae stars in the Catalina Sky Survey (Drake+, 2013)J/ApJ/763/32 : Galactic halo RRab stars from CSS (Drake+, 2013)J/AJ/144/114 : Radial velocities of 6 field RR Lyrae (Sesar+, 2012)J/ApJ/752/42 : BV time series in Ursa Major II (Dall'Ora+, 2012)J/ApJ/740/65 : VLA search for 5GHz radio transients (Ofek+, 2011)J/ApJ/731/4 : Galactic halo as seen by the CFHTLS (Sesar+, 2011)J/AJ/141/90 : SEGUE stellar parameter pipeline. V. (Lee+, 2011)J/ApJ/708/717 : Light curve templates of RR Lyrae stars (Sesar+, 2010)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/MNRAS/396/553 : Galactic RR Lyrae data (Dambis, 2009)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/AJ/136/1645 : Spectroscopy of bright QUEST RR Lyrae stars (Vivas+, 2008)J/ApJ/684/1143 : BHB candidates in the Milky Way (Xue+, 2008)J/ApJ/670/346 : M giant stars in the Sagittarius dwarf gal. V. (Chou+, 2007)J/MNRAS/380/281 : Faint galactic satellites spectrosc. survey (Martin+, 2007)J/AJ/132/714 : QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006)J/AJ/127/3034 : Proper-motion catalog combining USNO-B and SDSS (Munn+, 2004)J/AJ/127/899 : Blue HB stars in SDSS (Sirko+, 2004)J/A+AS/125/321 : RR Lyrae radial velocities and [Fe/H] II. (Solano+ 1997)J/AJ/108/1016 : Kinematics of local RR lyrae stars. I. (Layden, 1994)http://crts.caltech.edu/ : The Catalina Real-Time Transient Survey home pagehttp://astroweb.lanl.gov/lineardb : LINEAR Survey photometric databasehttp://www.ptf.caltech.edu/iptf : Intermediate Palomar Transient Factory pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/776/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/776/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/776/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/776/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/776/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/776/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/776/26/table13 (Positions, light curve parameters, line-of-sight velocities, proper motions, and metallicities of RR Lyrae targets (tables 1 and 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/776/26/table13?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/776/26/table13?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/776/26/table13?GETtext/xml+votable180.050000true145.6222461166.493010.005555555555555556Cone search capability for table J/ApJ/776/26/table2 (Positions and light curve parameters of CSS RRab stars without spectroscopic observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/776/26/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/776/26/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/776/26/table2?GETtext/xml+votable180.050000true133.1715354.068280.0055555555555555565/1409 6/4421 4432 4433 4435 4441 4445 4447 4564 4567 4573 4604 5156 5162 5248 5256 5258 5259 5263 5282 5286 5289 5291 5295 5299 5305 5658 5662 5678 5680 5681 5683 5690 5694 5776 5780 5787 5788 5814 5821 5835 5857 5858 7191 7224 7233 7267 7316 7380 7465 7589 26745 27017 27047 27053 27058 27408 27409 27414 27422 27442 27451 27464 27471 27496 27500 27514 27515 27590 27592 27595 27597 27598 27623 27633 27634 27642 27644 27645 28331https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/776/26?format=asciiOpticaldefaultJ/ApJ/776/26/table13Positions, light curve parameters, line-of-sight velocities, proper motions, and metallicities of RR Lyrae targets (tables 1 and 3)SimbadNameSimbad column added by the CDSmeta.idchare_HRV[9/22] Uncertainty in HRVkm/sstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameRR Lyrae identifier (RR0-RR49)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainSurveySurvey (CSS, LINEAR or PTF; see the "Description" section above)meta.notecharDist[19.5/55] Heliocentric distancekpcpos.distancefloat<mag>[17.1/19.1] Flux-averaged magnitude (G1)magphot.magfloatAr[0.03/0.4] SDSS r band extinction (G2)magphys.absorption;em.opt.RfloatAmp[0.3/1.1] Amplitudemagphot.magfloatmag0[16.7/18.6] Magnitude at epoch of maximum brightnessmagphot.magfloatPer[0.46/0.76] Period of pulsationdtime.perioddoubleHJDReduced Heliocentric Julian Date of maximum brightness; HJD-2400000dtime.epochdoubleHRV[-115/248] Heliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatVGSRGalactic standard of rest velocity, assuming the solar motion (10.1,224,6.7)km/skm/sphys.veloc;pos.galacticfloatpmGLON[-6/10] Proper motion along Galactic longitudemas/yrpos.pmfloatpmGLAT[-8/5] Proper motion along Galactic latitudemas/yrpos.pmfloate_pm[2.4/3.6] Error in each proper motionmas/yrstat.errorfloat[Fe/H][-2.8/-1.3] Metallicitylog(Sun)phys.abund.ZfloatMmProbability of being a Orphan stream member: "high", "medium" or "low"meta.id.parent;stat.probabilitycharCCatSources within 1.5" from the CSS catalog from Drake+, 2013, J/ApJ/763/32meta.ref.urlintnullableLCatSources within 1" from the LINEAR catalog from Sesar+, 2013, J/AJ/146/21meta.ref.urlintnullableDR7Display the SDSS-DR7 photometric data (Cat. II/294) within 1"meta.ref.urlcharSloanDisplay the SDSS data for the nearest objectmeta.ref.urlcharJ/ApJ/776/26/table2Positions and light curve parameters of CSS RRab stars without spectroscopic observationsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainDist[30.2/71] Heliocentric distance (1)kpcpos.distancefloat<mag>[17.8/19.8] Flux-averaged magnitude (G1)magphot.magfloatAr[0.03/0.2] SDSS r band extinction (G2)magphys.absorption;em.opt.RfloatAmp[0.3/1.2] Amplitudemagphot.magfloatmag0[17.2/19.2] Magnitude at epoch of maximum brightnessmagphot.magfloatPer[0.45/0.78] Period of pulsationdtime.perioddoubleHJDReduced Heliocentric Julian Date of maximum brightness; HJD-2400000dtime.epochdoubleDR7Display the SDSS-DR7 photometric data (Cat. II/294) within 1"meta.ref.urlcharSloanDisplay the SDSS data for the nearest objectmeta.ref.urlchar