J/MNRAS/443/2492ivo://CDS.VizieR/J/MNRAS/443/2492doi:10.26093/cds/vizier.74432492CDSPaunzen E.Iliev I.KH.Pintado O.I.Baum H.Maitzen H.M.Netopil M.,Onehag A.Zejda M.Fraga L.2024-08-10T20:18:12Z2015-07-28T14:33:11ZCDS support team

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

cds-question@unistra.frglobular-star-clustersphotometryGlobular clusters are main astrophysical laboratories to test and modify evolutionary models. Thought to be rather homogeneous in their local elemental distribution of members, results suggest a wide variety of chemical peculiarities. Besides different main sequences, believed to be caused by different helium abundances, peculiarities of blue horizontal-branch stars and on the red giant branch were found. This whole zoo of peculiar objects has to be explained in the context of stellar formation and evolution. The tool of {Delta}a photometry is employed in order to detect peculiar stars in the whole spectral range. This three filter narrow-band system measures the flux distribution in the region from 4900 to 5600{AA} in order to find any peculiarities around 5200{AA}. It is highly efficient to detect classical chemically peculiar stars of the upper main sequence, Be/Ae, shell and metal-weak objects in the Milky Way and Magellanic Clouds. We present {Delta}a photometry of 2266 stars from 109 individual frames for three globular clusters (NGC 104, NGC 6205, and NGC 7099). A comparison with published abundances, for three horizontal-branch stars, only, yields an excellent agreement. According to the 3{sigma} detection limit of each globular cluster, about 3 percent of the stars lie in abnormal regions in the diagnostic diagrams. The first observations of three widely different aggregates give very promising results, which will serve as a solid basis for follow-up observations including photometric as well as spectroscopic studies.2014MNRAS.443.2492Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/443/2492CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/248 : UBV photometry and proper motions in M13 (Kadla, 1966)J/AJ/112/1061 : BV photometry of NGC 7099 (Bergbusch 1996)J/AJ/113/669 : Stars in M13 core (Cohen+ 1997)J/AJ/116/1757 : M30 UBV photometry (Guhathakurta+, 1998)J/ApJ/518/262 : CCD VIc Photometry of M30 Stars (Sandquist+, 1999)J/A+A/398/541 : VI light-curves of the variable stars in M13 (Kopacki+, 2003)J/AJ/129/303 : Abundances of stars in M3 and M13 (Cohen+, 2005)J/A+A/462/L9 : Radial velocities in NGC 7099 (Scarpa+, 2007)J/ApJ/657/286 : Chandra X-ray sources in M30 (NGC 7099) (Lugger+, 2007)J/AJ/143/50 : White dwarfs in 47 Tuc (NGC 104) with HST (Woodley+, 2012)J/ApJ/754/L38 : Abundances and radial velocities of M13 giants (Johnson+, 2012)J/A+A/555/A36 : VrI light curves of NGC7099 variables (Kains+, 2013)J/ApJ/772/148 : Blue straggler and red giant stars in M30 (Lovisi+, 2013)J/A+A/566/A58 : Radial velocities in M3, M13, and M92 (Kamann+, 2014)J/ApJ/780/94 : Abundances of red giants in 47 Tuc (Cordero+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/443/2492https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/443/2492http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/443/2492https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/443/2492https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/443/2492http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/443/2492GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/443/2492/ngc104 (NGC 104 complete photometric data of the programme stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/443/2492/ngc104?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/443/2492/ngc104?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/443/2492/ngc104?GETtext/xml+votable180.050000true6.2083333-72.08755560.005555555555555556Cone search capability for table J/MNRAS/443/2492/ngc6205 (NGC 6205 complete photometric data of the programme stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/443/2492/ngc6205?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/443/2492/ngc6205?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/443/2492/ngc6205?GETtext/xml+votable180.050000true250.455536.48650.005555555555555556Cone search capability for table J/MNRAS/443/2492/ngc7099 (NGC 7099 complete photometric data of the programme stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/443/2492/ngc7099?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/443/2492/ngc7099?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/443/2492/ngc7099?GETtext/xml+votable180.050000true325.15675-23.18516670.0055555555555555566/9436 33321 484343.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/443/2492?format=asciiOpticaldefaultJ/MNRAS/443/2492/ngc104NGC 104 complete photometric data of the programme starsSeqStar sequential number within the clustermeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maing1-y[-1.3/0.3] g1-y colour index (1)magphot.colorfloate_g1-y[0/0.05] rms uncertainty on g1-ymagstat.errorfloatamag[0.2/1.0] a index (1)magphot.colorfloate_amag[0/0.05] rms uncertainty on amagmagstat.error;phot.magfloatDa[-0.09/0.11] Intrinsic peculiarity index {Delta}a (2)magspect.indexfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatJ/MNRAS/443/2492/ngc6205NGC 6205 complete photometric data of the programme starsSeqStar sequential number within the clustermeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maing1-y[-1.3/0.3] g1-y colour index (1)magphot.colorfloate_g1-y[0/0.05] rms uncertainty on g1-ymagstat.errorfloatamag[0.2/1.0] a index (1)magphot.colorfloate_amag[0/0.05] rms uncertainty on amagmagstat.error;phot.magfloatDa[-0.09/0.11] Intrinsic peculiarity index {Delta}a (2)magspect.indexfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatJ/MNRAS/443/2492/ngc7099NGC 7099 complete photometric data of the programme starsSeqStar sequential number within the clustermeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maing1-y[-1.3/0.3] g1-y colour index (1)magphot.colorfloate_g1-y[0/0.05] rms uncertainty on g1-ymagstat.errorfloatamag[0.2/1.0] a index (1)magphot.colorfloate_amag[0/0.05] rms uncertainty on amagmagstat.error;phot.magfloatDa[-0.09/0.11] Intrinsic peculiarity index {Delta}a (2)magspect.indexfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloat