J/ApJ/751/130ivo://CDS.VizieR/J/ApJ/751/130doi:10.26093/cds/vizier.17510130CDSShi W.B.Chen Y.Q.Carrell K.Zhao G.2014-03-01T15:00:02Z2014-02-14T10:45:13ZCDS support team

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

cds-question@unistra.frhorizontal-branch-starschemical-abundancesradial-velocitystellar-distanceWe have selected 556 red horizontal branch stars along the streams of the Sagittarius (Sgr) dwarf galaxy from Sloan Digital Sky Survey DR7 spectroscopic data using a theoretical model. The metallicity and {alpha}-element distributions are investigated for stars in the Sgr streams and for Galactic stars at the same locations. We find that the Sgr stars have two peaks in the metallicity distribution while the Galactic stars have a more prominent metal-poor peak. Meanwhile, [{alpha}/Fe] ratios of the Sgr stars are lower than those of the Galactic stars. Among the Sgr stars, we find a difference in the metallicity distribution between the leading and trailing arms of the Sgr tidal tails. The metallicity and [{alpha}/Fe] distribution of the leading arm is similar to that of the Galaxy. The trailing arm is composed mainly of a metal-rich component and [{alpha}/Fe] is obviously lower than that of the Galactic stars. The metallicity gradient is -(1.8+/-0.3)x10^-3^dex/deg in the first wrap of the trailing arm and -(1.5+/-0.4)x10^-3^dex/deg in the first wrap of the leading arm. No significant gradient exists along the second wraps of the leading or trailing arms. It seems that the Sgr dwarf galaxy initially lost the metal-poor component in the second wrap (older) arms due to the tidal force of our Galaxy and then the metal-rich component is disrupted in the first wrap (younger) arms. Finally, we found that the velocity dispersion of the trailing arm from 88{deg}<{Lambda}_{sun}_<112{deg} is {sigma}=9.808+/-1.0km/s, which is consistent with previous work in the literature.2012ApJ...751..130Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/130CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/427/2647 : Sgr dSph stars spectral classification (McDonald+, 2012)J/ApJ/731/119 : BHB candidates in Sagittarius stream (Ruhland+, 2011)J/ApJ/708/1290 : A 2MASS view of the Sgr dSph. VI. (Chou+, 2010)J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)J/A+A/513/A62 : Sgr dSph VIMOS photometry and RVs (Giuffrida+, 2010)J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)J/A+A/464/201 : RGB stars in Sagittarius streams (Monaco+, 2007)J/AJ/128/245 : M giant stars in the Sgr dwarf galaxy (Majewski+, 2004)J/AJ/113/634 : The survival of Sagittarius dwarf galaxy (Ibata+ 1997)J/AJ/110/1141 : Variables in the Sagittarius dSph (Mateo+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/130https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/751/130http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/751/130https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/751/130https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/751/130http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/751/130GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/751/130/table1 (The Sgr sample of red horizontal-branch stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/130/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/130/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/130/table1?GETtext/xml+votable180.050000true189.805-2.234030.005555555555555556Cone search capability for table J/ApJ/751/130/table2 (The Galactic sample of red horizontal-branch stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/130/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/130/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/130/table2?GETtext/xml+votable180.050000true189.3721.298550.0055555555555555565/5 7 12 64 1134 1276 2066 2088 2204 2211 2578 2728 4199 4378 4390 4437 4442 4454 4457 5764 5798 5800 5802 5835 5866 6484 6565 6566 6569 6634 6993 7001 7055 6/0 1 2 15 19 25 26 39 52 56 57 65 66 67 68 72 260 321 324 1080 1082 4329 4391 4400 4415 4427 4430 4433 4436 4442 4530 4531 4533 4534 4540 4542 4568 4590 4617 4625 4631 4635 4639 4710 4730 4734 4737 4742 4743 4747 4749 4750 4762 4768 4772 4774 4787 4790 4794 4796 4798 4811 4814 4819 4820 4822 4823 4856 4880 4893 4899 4919 4945 4946 4947 4948 4950 4951 4953 4956 4961 4964 4966 4967 4972 4973 4976 4978 4984 4992 5025 5037 5048 5069 5101 5108 5112 5113 5121 5129 5140 5152 5162 5163 5166 5191 5200 5202 5203 5248 5250 5251 5254 5264 5268 5283 5298 5309 5353 5355 5365 5366 5400 5418 5422 5432 5435 5436 5462 5485 5491 5492 5509 5518 5520 5522 5523 5571 5653 5659 5662 5665 5692 5725 5734 5792 5796 5817 5820 5836 5843 5888 5891 5894 5897 5907 5913 5916 5923 6149 6160 6219 6222 6295 6300 6303 6304 6312 6338 6346 6351 6362 6363 6372 6375 6381 6384 6385 6397 6398 6399 6427 6430 6434 6440 6448 6451 6452 6453 6454 6475 6506 6514 6528 6534 6562 6569 6584 6704 6706 6708 6710 6712 6713 6729 6732 6733 6734 7170 7184 7201 8199 8236 8259 8263 8268 8270 8314 8356 8357 8443 8712 8795 8798 8807 8825 8843 8865 8868 8870 8871 10293 10300 10318 10319 10336 10337 10338 10340 10342 10397 10399 10404 10408 10409 10411 10419 10752 10754 10771 10890 10891 16790 16793 16795 16817 16821 17229 17230 17231 17240 17243 17252 17253 17264 17265 17469 17506 17507 17508 17510 17511 17516 17517 17518 17549 17554 17555 17564 17566 17600 17601 17661 17725 17726 17727 17743 17745 17746 17747 17752 17753 17755 17756 17757 17759 17761 17762 17763 17764 17765 17772 17773 17776 17777 17805 17807 17809 17810 17811 17813 17814 17820 17821 17825 17826 17827 17833 17834 17835 17836 17837 17840 17841 17856 17857 17858 17901 17906 17907 17910 17912 17913 17915 17916 17997 17998 18002 18004 18005 18008 18012 18176 18177 18178 22458 22459 22460 22462 22491 22514 22515 22715 22737 22862 22863 22881 22884 22887 22896 22898 23049 23050 23051 23052 23054 23055 23060 23062 23068 23073 23076 23077 23103 23146 23181 23182 23185 23187 23188 23190 23191 23196 23206 23212 23214 23231 23236 23272 23274 23275 23335 23354 23398 23406 23416 23418 23429 23440 23468 23470 23534 23535 23825 24045 24047 24054 24056 24060 24061 24113 24115 24117 24118 24237 24242 24333 24388 24389 24400 25942 25944 25945 25947 25948 25950 25959 25990 26004 26033 26161 26162 26163 26164 26166 26168 26169 26171 26172 26173 26178 26187 26191 26194 26195 26201 26202 26203 26224 26225 26253 26255 26259 26268 26269 26281 26283 26284 26285 26286 26288 26289 26290 26311 26365 26409 26444 26465 26466 26467 26471 26473 26475 26476 26496 26521 26540 26542 26543 26547 26564 26566 26572 26589 26618 27132 27134 27135 27455 27476 27477 27487 27491 27541 27543 27615 27634 27635 27639 27641 27643 27644 27645 27647 27649 27655 27682 27697 27708 27726 27733 27740 27753 27765 27801 27816 27818 27819 27821 27823 27825 27841 27842 27851 27861 27872 27905 27911 27941 27947 27981 27984 28001 28003 28009 28012 28017 28045 28056 28067 28070 28072 28073 28075 28076 28078 28154 28157 28158 28159 28160 28161 28173 28178 28180 28184 28237 28242 28243 28265 28266 28267 28308 28309 28316 28338 28352 28353 28374 28384 28410 28411 28418 28447 28450 28485 28495 28501 28503 28504 28515 28524 28530 28558 28561 28577 28579 28619 28630 28634 28643 28645 28661 28663 28669 31293 31295 31329 31357 31358 31359 31400 31417 31433 31445 31447 31455 31490 31522 31528 36731 36773 36774 36775 36781 36782 36783 36786 36794 36863https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/751/130?format=asciiOpticaldefaultJ/ApJ/751/130/table1The Sgr sample of red horizontal-branch starsPlateSDSS-DR7 Platemeta.noteintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDSDSS-DR7 Modified Julian Datedtime.epochintFiberSDSS-DR7 Fibermeta.noteintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main[Fe/H][-2/0] Metallicitylog(Sun)phys.abund.Zfloat[a/Fe][0/0.5] The {alpha}/Fe abundance ratiophys.abund;arith.ratiofloatDist[7.2/62.2] Distancekpcpos.distance;pos.heliocentricfloatRV[-437/989] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.6/15] Error in RVkm/sstat.errorfloatVgsrGalactic Standard of Rest velocity (2)km/sphys.veloc;pos.galactocentricfloatLambda[74/317] Longitude {Lambda} along orbital planedegpos.earth.lonfloatXgcX position relative to Galactic centerkpcpos.distance;pos.cartesian.xfloatZgcZ position relative to Galactic centerkpcpos.distance;pos.cartesian.zfloatLocLocation note (1)meta.notecharDR7+DR9Display the photometric catalogs SDSS-DR7 (Cat. II/294) and SDSS-DR9 (Cat. V/139) within 1.5"meta.ref.urlcharSloanDisplay the online SDSS data for this starmeta.ref.urlcharJ/ApJ/751/130/table2The Galactic sample of red horizontal-branch starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlateSDSS-DR7 Platemeta.noteintMJDSDSS-DR7 Modified Julian Datedtime.epochintFiberSDSS-DR7 Fibermeta.noteintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main[Fe/H][-2/0] Metallicitylog(Sun)phys.abund.Zfloat[a/Fe][0/0.5] The {alpha}/Fe abundance ratiophys.abund;arith.ratiofloatDist[7.2/62.2] Distancekpcpos.distance;pos.heliocentricfloatRV[-437/989] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.6/15] Error in RVkm/sstat.errorfloatVgsrGalactic Standard of Rest velocity (2)km/sphys.veloc;pos.galactocentricfloatLambda[74/317] Longitude {Lambda} along orbital planedegpos.earth.lonfloatXgcX position relative to Galactic centerkpcpos.distance;pos.cartesian.xfloatZgcZ position relative to Galactic centerkpcpos.distance;pos.cartesian.zfloatLocLocation note (1)meta.notecharDR7+DR9Display the photometric catalogs SDSS-DR7 (Cat. II/294) and SDSS-DR9 (Cat. V/139) within 1.5"meta.ref.urlcharSloanDisplay the online SDSS data for this starmeta.ref.urlchar