J/A+A/689/A108ivo://CDS.VizieR/J/A+A/689/A108doi:10.26093/cds/vizier.36890108CDSFiguera Jaimes R.Catelan M.Horne K.Skottfelt J.Snodgrass C.,Dominik M.Jorgensen U.G.Southworth J.Hundertmark M.Longa-Pena P.,Sajadian S.Tregolan-Reed J.Hinse T.C.Andersen M.I.Bonavita M.,Bozza V.Burgdorf M.J.Haikala L.Khalouei E.Korhonen H.Peixinho N.,Rabus M.Rahvar S.2025-08-26T11:39:41Z2024-09-06T08:55:19ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsphotometryvisible-astronomyHigh frame-rate imaging was employed to mitigate the effects of atmospheric turbulence (seeing) in observations of globular cluster Terzan 5. High-precision time-series photometry has been obtained with the highest angular resolution so far taken in the crowded central region of Terzan 5, with ground-based telescopes, and ways to avoid saturation of the brightest stars in the field observed. The Electron-Multiplying Charge Coupled Device (EMCCD) camera installed at the Danish 1.54-m telescope at the ESO La Silla Observatory was employed to produce thousands of short-exposure time images (ten images per second) that were stacked to produce the normal-exposure-time images (minutes). We employed difference image analysis in the stacked images to produce high-precision photometry using the DanDIA pipeline. Light curves of 1670 stars with 242 epochs were analyzed in the crowded central region of Terzan 5 to statistically detect variable stars in the field observed. We present a possible visual counterpart outburst at the position of the pulsar J1748-2446N, and the visual counterpart light curve of the low-mass X-ray binary CX 3. Additionally, we present the discovery of 4 semiregular variables. We also present updated ephemerides and properties of the only RR Lyrae star previously known in the field covered by our observations in Terzan 5. Finally, we report a significant displacement of two sources by ~0.62 and 0.59 arcseconds with respect to their positions in previous images available in the literature.2024A&A...689A.108Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/689/A108CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/308/733 : NTT VI photometry in Terzan 5 (Ortolani+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/689/A108https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/689/A108http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/689/A108https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/689/A108https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/689/A108http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/689/A108GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/689/A108/table5 (Ephemerides and main properties of variable stars studied in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/689/A108/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/689/A108/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/689/A108/table5?GETtext/xml+votable180.050000true267.0213625-24.777383330.005555555555555556Cone search capability for table J/A+A/689/A108/table2 (Information used to build the CMD for Terzan 5 with data listed in Ortolani et al. (1996A&A...308..733O, Cat. J/A+A/308/733))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/689/A108/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/689/A108/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/689/A108/table2?GETtext/xml+votable180.050000true266.998875-24.79830560.0055555555555555566/28899 289052.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/689/A108?format=asciiOpticaldefaultJ/A+A/689/A108/table5Ephemerides and main properties of variable stars studied in this workLCShow the light curvemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVIDVariable IDmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainEpoch? Epoch used in the phased light curves (HJD)dphys.composition.massLightRatiodoublenullablePer? Period estimation obtained in this workdtime.perioddoublenullablee_Per? Period errordstat.errordoublenullablen_PerNote on Per (1)meta.notecharImag? Median I magnitudemagphot.mag;em.opt.IfloatnullableAmp? Peak-to-peak amplitudemagsrc.var.amplitudefloatnullableNNumber of epochsmeta.numberintTypeClassification of the variablesrc.classcharGaiaDR3? Gaia DR3 identifier (from table 6)meta.idnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/A+A/689/A108/table1Time-series photometry for all known and new variables in the field of view covered in Terzan 5recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCluster[Terzan5] Cluster namemeta.id.parentcharVIDVariable IDmeta.id;meta.maincharFilter[I] Filtermeta.id;instr.filtercharHJDHeliocentric Julian date of of mid-exposure (UTC)dtime.epochdoubleindexedImagstdStandard I magnitudemagphot.mag;em.opt.IfloatImaginstInstrumental I magnitudemagphot.mag;em.opt.Ifloate_ImaginstI magnitude errormagstat.errorfloatFrefReference flux of each star detected in the reference frame (in ADU/s)phot.flux.density;em.opt.Idoublee_FrefFref error (in ADU/s)stat.errorfloatFdiffDifference flux measured in the difference images at the position of each star detected in the reference frame (in ADU/s)phot.flux;arith.ratiodoublee_FdiffFdiff error (in ADU/s)stat.errordoublepPhotometric scale factor used to scale the reference frame to each imagearith.factorfloatJ/A+A/689/A108/table2Information used to build the CMD for Terzan 5 with data listed in Ortolani et al. (1996A&A...308..733O, Cat. J/A+A/308/733)RAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar IDmeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detfloatYposY positionpixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.VfloatImagI magnitudemagphot.mag;em.opt.IfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.Ifloat