J/MNRAS/360/185ivo://CDS.VizieR/J/MNRAS/360/185doi:10.26093/cds/vizier.73600185CDSBellazzini M.Gennari N.Ferraro F.R.2024-07-01T20:14:49Z2005-08-20T21:29:27ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryWe present V and I photometry of a 9.4'x9.4' field centered on the dwarf spheroidal galaxy Leo II. The Tip of the Red Giant Branch is identified at I^TRGB^=17.83+/-0.03 and adopting <[M/H]>=-1.53+/-0.2 from the comparison of RGB stars with Galactic templates, we obtain a distance modulus (m-M)_0=21.84+/-0.13, corresponding to a distance D=233+/-15kpc. Two significant bumps have been detected in the Luminosity Function of the Red Giant Branch. The fainter bump (B1, at V=21.79+/-0.05) is the RGB bump of the dominant stellar population while the brightest one (B2, at V=21.36+/-0.05) may be identified as the Asymptotic Giant Branch Clump of the same population. The luminosity of the main RGB bump (B1) suggest that the majority of RGB stars in Leo II belongs to a population that is >~4Gyr younger than the classical Galactic globular clusters. The stars belonging to the He-burning Red Clump are shown to be significantly more centrally concentrated than RR Lyrae and Blue Horizontal Branch stars, probing the existence of an age/metallicity radial gradient in this remote dwarf spheroidal.2005MNRAS.360..185Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/360/185CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/354/708 : Leo I VI photometry (Bellazzini+, 2004)J/AJ/120/284 : Variables in Leo II dwarf spheroidal (Siegel+, 2000)J/MNRAS/261/657 : Deep CCD photometry of Leo II (Demers+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/360/185https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/360/185http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/360/185https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/360/185https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/360/185http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/360/185GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/360/185/catalog (Leo II stars positions and magnitudes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/360/185/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/360/185/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/360/185/catalog?GETtext/xml+votable180.050000true168.3686833322.087227780.0055555555555555566/28361https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/360/185?format=asciiOpticalInfrareddefaultJ/MNRAS/360/185/catalogLeo II stars positions and magnitudesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification numberintVmagJohnson V magnitudemagfloate_VmagUncertainty on V magnitude (DoPHOT)magfloatIcmagCousins I magnitudemagfloate_IcmagUncertainty on Ic magnitude (DoPHOT)magfloatxposx position in the framepixfloatyposy position in the framepixfloatRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.main[SM2000]Variable star name according to Siegel & Majewski, 2000, Cat. <J/AJ/120/284> (except V173, this paper)char