J/AJ/135/2141ivo://CDS.VizieR/J/AJ/135/2141doi:10.26093/cds/vizier.51352141CDSRicher H.B.Dotter A.Hurley J.Anderson J.King I.Davis S.,Fahlman G.G.Hansen B.M.S.Kalirai J.Paust N.Rich R.M.Shara M.M.2011-02-23T14:45:57Z2011-02-04T12:05:10ZCDS support team

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

cds-question@unistra.frglobular-star-clustershst-photometryWe present the color-magnitude diagram (CMD) from deep Hubble Space Telescope imaging in the globular cluster NGC 6397. The Advanced Camera for Surveys (ACS) was used for 126 orbits to image a single field in two colors (F814W, F606W) 5' SE of the cluster center. The field observed overlaps that of archival WFPC2 data from 1994 and 1997 which were used to proper motion (PM) clean the data. Applying the PM corrections produces a remarkably clean CMD which reveals a number of features never seen before in a globular cluster CMD. In our field, the main-sequence stars appeared to terminate close to the location in the CMD of the hydrogen-burning limit predicted by two independent sets of stellar evolution models.2008AJ....135.2141Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/135/2141CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/287/769 : UV photometry of NGC 6397 (Burgarella+ 1994)J/ApJS/99/637 : Equivalent widths for 54 red giants (Norris+ 1995)J/PASP/108/682 : Low-Mass Stars in Outer Field in NGC 6397 (Mould+, 1996)J/A+AS/122/1 : BV photometry of variables in NGC 6397 (Kaluzny, 1997)J/AJ/119/1225 : Stroemgren photometry of Omega Cen and NGC 6397 (Hughes+ 2000)J/A+A/425/509 : VI photometry of NGC 6397 (Andreuzzi+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/135/2141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/135/2141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/135/2141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/135/2141https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/135/2141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/135/2141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.0401237512456292e-19 2.706461185444514e-19OpticaldefaultJ/AJ/135/2141/table1Photometry of proper motion selected NGC 6397 cluster starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposThe X pixel coordinate (1)pixpos.cartesian.xfloatYposThe Y pixel coordinate (1)pixpos.cartesian.yfloatF814WThe F814W band VEGAMAGS magnitude (2)magphot.mag;em.opt.IfloatF606W-F814WThe (F606W-F814W) color index (2)magphot.color;em.opt.V;em.opt.IfloatdxThe X pixel shift (3)pixpos.cartesian.xfloatdyThe Y pixel shift (3)pixpos.cartesian.yfloat