J/ApJ/710/332ivo://CDS.VizieR/J/ApJ/710/332doi:10.26093/cds/vizier.17100332CDSDieball A.Long K.S.Knigge C.Thomson G.S.Zurek D.R.2018-01-02T13:43:09Z2012-04-11T12:35:16ZCDS support team

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

cds-question@unistra.frglobular-star-clustersultraviolet-photometryastronomical-object-identificationhorizontal-branch-starsUsing the Advanced Camera for Surveys on Hubble Space Telescope, we have surveyed the far-ultraviolet (FUV) and near-ultraviolet (NUV) populations in the core region of M80. The color-magnitude diagram (CMD) reveals large numbers of blue and extreme horizontal branch stars and blue stragglers, as well as ~60 objects lying in the region of the CMD where accreting and detached white dwarf binaries are expected. Overall, the blue straggler stars are the most centrally concentrated population, with their radial distribution suggesting a typical blue straggler mass of about 1.2M_{sun}_. However, counterintuitively, the faint blue stragglers are significantly more centrally concentrated than the bright ones and a Kolmogorov-Smirnov test suggest only a 3.5% probability that both faint and bright blue stragglers are drawn from the same distribution. This may suggest that (some) blue stragglers get a kick during their formation. We have also been able to identify the majority of the known X-ray sources in the core with FUV bright stars. One of these FUV sources is a likely dwarf nova that was in eruption at the time of the FUV observations. This object is located at a position consistent with Nova 1860 AD, or T Scorpii. Based on its position, X-ray and UV characteristics, this system is almost certainly the source of the nova explosion. The radial distribution of the X-ray sources and of the cataclysmic variable candidates in our sample suggest masses >1M_{sun}_.2010ApJ...710..332Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/710/332CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/A+A/417/597 : Radial velocities in 4 globular clusters (Recio-Blanco+, 2004)J/A+A/391/945 : HST photometry of 74 galactic globular clusters (Piotto+, 2002)J/ApJ/522/983 : M80 blue straggler stars (Ferraro+, 1999)J/AJ/116/2415 : CCD UBVRI Photometry of M80 (Alcaino+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/710/332https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/710/332http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/710/332https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/710/332https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/710/332http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/710/332GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/710/332/table1 (Catalog of all sources in our FUV field of view)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/710/332/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/710/332/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/710/332/table1?GETtext/xml+votable180.050000true244.25539583-22.978619440.005555555555555556Cone search capability for table J/ApJ/710/332/table6 (*Chandra X-ray source comparison)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/710/332/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/710/332/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/710/332/table6?GETtext/xml+votable180.050000true244.2617375-22.976088890.0055555555555555566/429903.322582951404819e-19 1.1584911379538804e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/710/332?format=asciiUVdefaultJ/ApJ/710/332/table1Catalog of all sources in our FUV field of viewrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1,3168] Running sequence numbermeta.id;meta.mainintIDFUV[1,10007] FUV identification numbermeta.id;meta.mainintprimaryXSimbad column added by the CDSmeta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainXpixFUV image X pixel coordinatepixpos.framedoubleYpixFUV image Y pixel coordinatepixpos.framedoubleFUVHST/SBC F165LP (far-UV) magnitude (165nm)magphot.mag;em.UV.100-200nmfloate_FUVError in FUVmagstat.errorfloatNUV? HST/HRC F250W (near-UV) magnitude (250nm)magphot.mag;em.UVfloatnullablee_NUV? Error in NUVmagstat.errorfloatnullableIDP[44,200039]? Optical counterpart number (G1)meta.id.crossintnullableBmag? Johnson B magnitude, reddening correctedmagphot.mag;em.opt.BfloatnullableVmag? Johnson V magnitude, reddening correctedmagphot.mag;em.opt.VfloatnullableCommAdditional comments (G2)meta.notecharJ/ApJ/710/332/table6*Chandra X-ray source comparisonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDXChandra source designation (from Heinke et al., 2003ApJ...598..516H; <[HGE2003] CXNN> in Simbad)meta.id;meta.maincharRAJ2000Revised X-ray hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Revised X-ray degree of declination (J2000)pos.eq.dec;meta.mainePos? 3{sigma} statistical uncertaintyarcsecstat.error;stat.valuefloatnullableOff? Angular distance from the nominal position to the FUV objectarcsecpos.angDistancefloatnullableIDFUV[214,4850]? FUV source designation (NNNN)meta.id.crossintnullableFUV? HST/SBC FUV band magnitude (F165LP filter)magphot.mag;em.UV.100-200nmfloatnullablee_FUV? FUV uncertaintymagstat.errorfloatnullableNUV? HST/HRC NUV band magnitude (F250W filter)magphot.mag;em.UVfloatnullablee_NUV? NUV uncertaintymagstat.errorfloatnullableIDP[923,3338]? Optical counterpart number (G1)meta.id.crossintnullableBmag? Johnson B magnitude, reddening correctedmagphot.mag;em.opt.BfloatnullableVmag? Johnson V magnitude, reddening correctedmagphot.mag;em.opt.VfloatnullableCommAdditional comments (G2)meta.notechar