J/MNRAS/482/1080ivo://CDS.VizieR/J/MNRAS/482/1080doi:10.26093/cds/vizier.74821080CDSSahu S.Subramaniam A.Cote P.Rao N.K.Stetson P.B.2024-08-19T20:14:35Z2022-08-01T14:51:59ZCDS support team

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

cds-question@unistra.frhorizontal-branch-starshertzsprung-russell-diagramglobular-star-clustersultraviolet-photometryA complete census of the blue horizontal branch (BHB) and blue straggler star (BSS) population within a 10' radius from the centre of the globular cluster NGC 288 is presented, based on images from the Ultraviolet Imaging Telescope (UVIT). The UV and UV-optical colour-magnitude diagrams (CMDs) are constructed by combining the UVIT, HST-ACS and ground data and are compared with the Bag of Stellar Tracks and Isochrones (BaSTI) isochrones generated for UVIT filters. We used stellar proper motion data from GAIA DR2 to select the cluster members. Our estimations of the temperature distribution of 110 BHB stars reveal two peaks, with the main peak at T_eff_~10300K, and with the distribution extending up to T_eff_~18000K. We identify the well-known photometric gaps, including the Grundahl jump (G-jump) in the BHB distribution, which are located between the peaks. We detect a plateau in the far-ultraviolet (FUV) magnitude for stars hotter than T_eff_~11500K (G-jump), which could be caused by atomic diffusion. We detect two extreme horizontal branch (EHB) candidates, with temperatures ranging from 29000 to 32000K. The radial distribution of 68 BSSs suggests that the bright BSSs are more centrally concentrated than the faint BSSs and the BHB stars. We find that the BSSs have a mass range of 0.86-1.25M_{sun}_ and an age range of 2-10Gyr, with peaks at 1M_{sun}_ and 4Gyr respectively. This study showcases the importance of combining UVIT with HST, ground and GAIA data in deriving HB and BSS properties.2019MNRAS.482.1080Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/482/1080CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/482/1080https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/482/1080http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/482/1080https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/482/1080https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/482/1080http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/482/1080GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/482/1080/table2 (List of UVIT detected possible cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/482/1080/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/482/1080/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/482/1080/table2?GETtext/xml+votable180.050000true13.2012917-26.54950.0055555555555555566/16647 166581.0590977079788917e-19 1.3189343879298211e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/482/1080?format=asciiUVdefaultJ/MNRAS/482/1080/table2List of UVIT detected possible cluster membersTypeStar type (1)src.classcharIDStar IDmeta.id;meta.maincharDEJ2000Declination (J2000)pos.eq.dec;meta.mainF148Wmag? F148W UVIT filter magnitudemagphot.mag;em.UV.100-200nmfloatnullablee_F148Wmag? Error on F148Wmagmagstat.errorfloatnullableF169Mmag? F169M UVIT filter magnitudemagphot.mag;em.UV.100-200nmfloatnullablee_F169Mmag? Error on F169Mmagmagstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainN279NmagN279N UVIT filter magnitudemagphot.mag;em.UVfloate_N279NmagError on N279Nmagmagstat.error;phot.magfloatVmagOptical V magnitudemagphot.mag;em.opt.VfloatV-IOptical V-I magnitudemagphot.color;em.opt.V;em.opt.Ifloatr_VmagReference for Vmag and V-I (2)meta.ref;pos.framecharrRadial distance from the cluster centrearcminphys.angSizefloatpmRA? Proper motion in right ascension from Gaia DR2 (Gaia Collaboration et al. 2018A&A...616A..12G, Cat. I/345)mas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Error on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in declination from Gaia DR2 (Gaia Collaboration et al. 2018A&A...616A..12G, Cat. I/345)mas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Error on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullable