J/ApJ/793/62ivo://CDS.VizieR/J/ApJ/793/62doi:10.26093/cds/vizier.17930062CDSSheffield A.A.Johnston K.V.Majewski S.R.Damke G.Richardson W.,Beaton R.Rocha-Pinto H.J.2017-07-20T12:23:39Z2017-05-03T15:23:57ZCDS support team

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

cds-question@unistra.frgalaxiesm-starsgiant-starsinfrared-photometryradial-velocityline-intensitiesAs large-scale stellar surveys have become available over the past decade, the ability to detect and characterize substructures in the Galaxy has increased dramatically. These surveys have revealed the Triangulum-Andromeda (TriAnd) region to be rich with substructures in the distance range 20-30 kpc, and the relation of these features to each other, if any, remains unclear. An exploration using Two Micron All Sky Survey (2MASS) photometry reveals not only the faint sequence in M giants detected by Rocha-Pinto et al. (2004ApJ...615..732R) spanning the range 100{deg}<l<160{deg} and -50{deg}<b<-15{deg}, but, in addition, a second, brighter and more densely populated sequence. These sequences are likely associated with the distinct main sequences (MSs) discovered (and labeled TriAnd1 and TriAnd2) by Martin et al. (2007ApJ...668L.123M) in an optical survey in the direction of M31, where TriAnd2 is the optical counterpart of the fainter red giant branch (RGB)/asymptotic giant branch sequence of Rocha-Pinto et al. Here, the age, distance, and metallicity ranges for TriAnd1 and TriAnd2 are estimated by simultaneously fitting isochrones to the 2MASS RGB tracks and the optical MS/MS turn-off features. The two populations are clearly distinct in age and distance: the brighter sequence (TriAnd1) is younger (6-10 Gyr) and closer (distance of ~15-21 kpc), whereas the fainter sequence (TriAnd2) is older (10-12 Gyr) and at an estimated distance of ~24-32 kpc. A comparison with simulations demonstrates that the differences and similarities between TriAnd1 and TriAnd2 can simultaneously be explained if they represent debris originating from the disruption of the same dwarf galaxy, but torn off during two distinct pericentric passages.2014ApJ...793...62Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/793/62CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/125/1352 : Ursa Minor dSph M,T2, DDO51 photometry (Palma+, 2003)J/AJ/130/2677 : Stars in the Carina dSph galaxy field (Majewski+, 2005)J/ApJ/649/201 : Velocities and Washington photometry in Carina dSphJ/ApJ/663/960 : Radial velocities of Leo I stars (Sohn+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/793/62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/793/62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/793/62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/793/62https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/793/62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/793/62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/793/62/table3 (Properties of the Program Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/793/62/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/793/62/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/793/62/table3?GETtext/xml+votable180.050000true0.027539.9472220.0055555555555555566/250 538 573 588 790 795 819 820 841 888 890 909 925 934 935 951 967 984 1004 1007 1011 1016 1019 2056 2059 2140 2145 2148 2158 2190 2204 2210 2240 2252 2263 2266 2269 2273 2295 2340 2341 2344 2346 2364 2368 2369 2418 2434 2438 2439 2444 2458 2465 2468 2479 2483 2504 2528 2564 2567 2568 2574 2587 2588 2591 2593 2599 2615 2617 2618 2619 2621 2627 2632 2634 2636 2638 2642 2643 2649 2652 2658 2659 2661 2662 2667 2678 2681 2685 2686 2702 2706 2720 2723 2725 2728 2736 2742 2765 2784 2786 2816 2823 13569 13580 13581 13593 13605 13617 13618 13624 13631 13644 13645 13649 13654 13657 13665 13668 13676 13691 13692 13717 13723 13744 13762 13765 13768 17886 18262 19657 19733 19803 19822 19836 19843 19909 19939 19943 19957 19959 19962 19963 19964 20085 20180 20226 20235 20242 20244 20256 20259 20323 20372 20374 20427 20443 20445 20453 20457 20476https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/793/62?format=asciiInfraredOpticaldefaultJ/ApJ/793/62/table3Properties of the Program Stars_DEPositinos from Name (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifier; HHMMSSs+DDMMSSmeta.id;meta.maincharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatKsmagDereddened 2MASS K_S_ band magnitudemagphot.mag;em.IR.KfloatJ-KsDereddened 2MASS (J-K_S_) colormagphot.color;em.IR.J;em.IR.KfloatHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVUncertainty in HRVkm/sstat.errorfloatS/NSignal-to-noise ratiostat.snrintEWNaI1Na I doublet equivalent width (1)0.1nmspect.line.eqWidth;em.opt.IfloatEWNaI2Na I doublet equivalent width (2)0.1nmspect.line.eqWidth;em.opt.IfloatDateObservation datetime.epoch;obsnullableInstInstrument used in the observationinstr.setup;obscharClass[DG] Stellar classification (3)meta.code.classcharGroupStellar group (4)meta.idchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar_RAPositinos from Name (right ascension part)degpos.eq.ra;meta.main