J/A+A/677/A86ivo://CDS.VizieR/J/A+A/677/A86doi:10.26093/cds/vizier.36770086CDSLatour M.Haemmerich S.Dorsch M.Heber U.Husser T.-O.Kamann S.,Dreizler S.Brinchmann J.2025-06-24T20:01:09Z2023-09-08T07:52:34ZCDS support team

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

cds-question@unistra.frglobular-star-clustershorizontal-branch-starsspectroscopyultraviolet-photometryvisible-astronomyIn this work, we characterize the properties of HB stars in the GCs {omega} Cen and NGC 6752. We use dedicated model atmospheres and synthetic spectra grids computed using a hybrid LTE/NLTE modeling approach to fit the MUSE spectra of HB stars hotter than 8000K in both clusters. The spectral fits provide estimates of the effective temperature (Teff), surface gravity (logg), and helium abundance of the stars. The model grids are further used to fit the HST magnitudes, meaning the spectral energy distributions (SED), of the stars. From the SED fits, we derive the average reddening, radius, luminosity, and mass of the stars in our sample. The atmospheric and stellar properties that we derive for the stars in our sample are in good agreement with the theoretical expectations. We use three different diagnostics, namely the position of the G-jump and changes in metallicity and helium abundances to place the onset of diffusion in the stellar atmospheres at Teff between 11 and 11.5kK. Our sample includes two stars known as photometric variables, we confirm one to be a bona fide extreme HB object but the other is a blue straggler star. Finally, unlike what has been reported in the literature, we do not find significant differences between the properties of the stars in both clusters.2023A&A...677A..86Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/677/A86CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/710/1032 : Proper motions in {omega} Cen (Anderson+, 2010)J/ApJ/842/6 : Astro-photometric catalog of NGC 5139 core (Bellini+, 2017)J/A+A/618/A15 : Parameters of EHB stars in {omega} Cen (Latour+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/677/A86https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/677/A86http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/677/A86https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/677/A86https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/677/A86http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/677/A86GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/677/A86/tableb1 (Atmospheric parameters for stars in NGC 6752)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A86/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A86/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A86/tableb1?GETtext/xml+votable180.050000true287.72720806-60.017183890.005555555555555556Cone search capability for table J/A+A/677/A86/tableb2 (Atmospheric parameters for stars in {omega} Cen)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A86/tableb2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A86/tableb2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A86/tableb2?GETtext/xml+votable180.050000true201.68030306-47.494511110.005555555555555556Cone search capability for table J/A+A/677/A86/tableb3 (SED fit results (Teff free) for NGC 6752)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A86/tableb3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A86/tableb3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A86/tableb3?GETtext/xml+votable180.050000true287.72720806-60.017183890.005555555555555556Cone search capability for table J/A+A/677/A86/tableb4 (SED fit results (Teff free) for {omega} Cen)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A86/tableb4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A86/tableb4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A86/tableb4?GETtext/xml+votable180.050000true201.68030306-47.494511110.005555555555555556Cone search capability for table J/A+A/677/A86/tableb5 (SED fit results (Teff fixed) for NGC 6752)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A86/tableb5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A86/tableb5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A86/tableb5?GETtext/xml+votable180.050000true287.72720806-60.017183890.005555555555555556Cone search capability for table J/A+A/677/A86/tableb6 (SED fit results (Teff fixed) for {omega} Cen)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A86/tableb6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A86/tableb6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A86/tableb6?GETtext/xml+votable180.050000true201.68030306-47.494511110.0055555555555555566/43227 47125 471682.0401237512456292e-19 7.605786964834612e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/677/A86?format=asciiUVOpticaldefaultJ/A+A/677/A86/tableb1Atmospheric parameters for stars in NGC 6752recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeffEffective temperature (Teff)Kphys.temperature.effectiveintb_TeffMinimum value of Teff (1)Kphys.temperature.effective;stat.minintB_TeffMaximum value of Teff (1)Kphys.temperature.effective;stat.maxintloggSurface gravity in log (log g)log(cm.s**-2)phys.gravityfloatb_loggMinimum value of log g (1)log(cm.s**-2)arith.zp;stat.minfloatB_loggMaximum value of log g (1)log(cm.s**-2)arith.zp;stat.maxfloatlogN(He)/N(tot)Surface helium abundance ratio in logphys.abundfloatb_logN(He)/N(tot)Minimum value of the He abundance ratio (1)phys.abund.Y;stat.minfloatB_logN(He)/N(tot)Maximum value of the He abundance ratio (1)phys.abund.Y;stat.maxfloatSNRSignal-to-noise ratio of the spectrumstat.snrintNSpecNumber or individual spectra combinedmeta.numberintNoteAlternative star name and identification of the blue straggler stars (2)meta.notecharJ/A+A/677/A86/tableb2Atmospheric parameters for stars in {omega} CenrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeffEffective temperature (Teff)Kphys.temperature.effectiveintb_TeffMinimum value of Teff (1)Kphys.temperature.effective;stat.minintB_TeffMaximum value of Teff (1)Kphys.temperature.effective;stat.maxintloggSurface gravity in log (log g)log(cm.s**-2)phys.gravityfloatb_loggMinimum value of log g (1)log(cm.s**-2)arith.zp;stat.minfloatB_loggMaximum value of log g (1)log(cm.s**-2)arith.zp;stat.maxfloatlogN(He)/N(tot)Surface helium abundance ratio in logphys.abundfloatb_logN(He)/N(tot)Minimum value of the He abundance ratio (1)phys.abund.Y;stat.minfloatB_logN(He)/N(tot)Maximum value of the He abundance ratio (1)phys.abund.Y;stat.maxfloatSNRSignal-to-noise ratio of the spectrumstat.snrintNSpecNumber or individual spectra combinedmeta.numberintNoteAlternative star name and identification of the blue straggler stars (2)meta.notecharJ/A+A/677/A86/tableb3SED fit results (Teff free) for NGC 6752B_SEDRMaximum value of the radius (1)solRadphys.size.radius;stat.maxfloatSEDMMasssolMassphys.massfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSEDTeffEffective temperature from the SED fitsKphys.temperature.effectiveintb_SEDTeffMinimum value of Teff (1)Kphys.temperature.effective;stat.minintB_SEDTeffMaximum value of Teff (1)Kphys.temperature.effective;stat.maxintSEDlogthetaSolid angle {theta} (2*R/D) in logphys.area;instrfloatb_SEDlogthetaMinimum value of log {theta} (1)arith.zp;stat.minfloatB_SEDlogthetaMaximum value of log {theta} (1)arith.zp;stat.maxfloatSEDRRadiussolRadphys.size.radiusfloatb_SEDRMinimum value of the radius (1)solRadphys.size.radius;stat.minfloatb_SEDMMinimum value of the mass (1)solMassphys.mass;stat.minfloatB_SEDMMaximum value of the mass (1)solMassphys.mass;stat.maxfloatSEDLLuminositysolLumphys.luminosityfloatb_SEDLMinimum value of the luminosity (1)solLumphys.luminosity;stat.minfloatB_SEDLMaximum value of the luminosity (1)solLumphys.luminosity;stat.maxfloatF275W? Magnitude WFC3/UVIS F275W (2)magphot.mag;em.UV.200-300nmfloatnullablee_F275W? Error on the F275W magnitude (2)magstat.errorfloatnullableF336W? Magnitude WFC3/UVIS F336W (2)magphot.mag;em.opt.Ufloatnullablee_F336W? Error on the F336W magnitude (2)magstat.errorfloatnullableF435WMagnitude ACS/WFC F435W (2)magphot.mag;em.opt.Bfloate_F435WError on the F435W magnitude (2)magstat.errorfloatF606WMagnitude ACS/WFC F606W (2)magphot.mag;em.opt.Rfloate_F606WError on the F606W magnitude (2)magstat.errorfloatF814WMagnitude ACS/WFC F814W (2)magphot.mag;em.opt.Ifloate_F814WError on the F814W magnitude (2)magstat.errorfloatNoteAlternative star name and identification of the blue straggler stars (3)meta.notecharJ/A+A/677/A86/tableb4SED fit results (Teff free) for {omega} Cene_F555W? Error on the F555W magnitude (2)magstat.errorfloatnullableF606WMagnitude WFC3/UVIS F606W (2)magphot.mag;em.opt.Rfloate_F606W? Error on the F606W magnitude (2)magstat.errorfloatnullableF775W? Magnitude WFC3/UVIS F775W (2)magphot.mag;em.opt.IfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSEDTeffEffective temperature from the SED fitsKphys.temperature.effectiveintb_SEDTeffMinimum value of Teff (1)Kphys.temperature.effective;stat.minintB_SEDTeffMaximum value of Teff (1)Kphys.temperature.effective;stat.maxintSEDlogthetaSolid angle {theta} (2*R/D) in logphys.area;instrfloatb_SEDlogthetaMinimum value of log {theta} (1)arith.zp;stat.minfloatB_SEDlogthetaMaximum value of log {theta} (1)arith.zp;stat.maxfloatSEDRRadiussolRadphys.size.radiusfloatb_SEDRMinimum value of the radius (1)solRadphys.size.radius;stat.minfloatB_SEDRMaximum value of the radius (1)solRadphys.size.radius;stat.maxfloatSEDMMasssolMassphys.massfloatb_SEDMMinimum value of the mass (1)solMassphys.mass;stat.minfloatB_SEDMMaximum value of the mass (1)solMassphys.mass;stat.maxfloatSEDLLuminositysolLumphys.luminosityfloatb_SEDLMinimum value of the luminosity (1)solLumphys.luminosity;stat.minfloatB_SEDLMaximum value of the luminosity (1)solLumphys.luminosity;stat.maxfloatF225W? Magnitude WFC3/UVIS F225W (2)magphot.mag;em.UV.200-300nmfloatnullablee_F225W? Error on the F225W magnitude (2)magstat.errorfloatnullableF275W? Magnitude WFC3/UVIS F275W (2)magphot.mag;em.UV.200-300nmfloatnullablee_F275W? Error on the F275W magnitude (2)magstat.errorfloatnullableF336W? Magnitude WFC3/UVIS F336W (2)magphot.mag;em.opt.Ufloatnullablee_F336W? Error on the F336 magnitude (2)magstat.errorfloatnullableF390W? Magnitude WFC3/UVIS F390W (2)magphot.mag;em.opt.Bfloatnullablee_F390W? Error on the F390W magnitude (2)magstat.errorfloatnullableF438W? Magnitude WFC3/UVIS F438W (2)magphot.mag;em.opt.Bfloatnullablee_F438W? Error on the F438W magnitude (2)magstat.errorfloatnullableF555WMagnitude WFC3/UVIS F555W (2)magphot.mag;em.opt.Vfloate_F775W? Error on the F775W magnitude (2)magstat.errorfloatnullableF814WMagnitude WFC3/UVIS F814W (2)magphot.mag;em.opt.Ifloate_F814W? Error on the F814W magnitude (2)magstat.errorfloatnullableAnd10F435W? Magnitude ACS/WFC F435W (3)magphot.mag;em.opt.Bfloatnullablee_And10F435W? Error on the F435W magnitude (3)magstat.errorfloatnullableAnd10F625W? Magnitude ACS/WFC F625W (3)magphot.mag;em.opt.Rfloatnullablee_And10F625W? Error on the F625W magnitude (3)magstat.errorfloatnullableBelliniIDID from Bellini et al. 2017ApJ...842....6B, Cat J/ApJ/842/6meta.idintNoteAlternative star name (4)meta.notecharJ/A+A/677/A86/tableb5SED fit results (Teff fixed) for NGC 6752recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeffspectroEffective temperature from the spectroscopic fitKphys.temperature.effectiveintSEDlogthetaSolid angle {theta} (2*R/D) in logphys.area;instrfloatb_SEDlogthetaMinimum value of log {theta} (1)arith.zp;stat.minfloatB_SEDlogthetaMaximum value of log {theta} (1)arith.zp;stat.maxfloatSEDRRadiussolRadphys.size.radiusfloatb_SEDRMinimum value of the radius (1)solRadphys.size.radius;stat.minfloatB_SEDRMaximum value of the radius (1)solRadphys.size.radius;stat.maxfloatSEDMMasssolMassphys.massfloatb_SEDMMinimum value of the mass (1)solMassphys.mass;stat.minfloatB_SEDMMaximum value of the mass (1)solMassphys.mass;stat.maxfloatSEDLLuminositysolLumphys.luminosityfloatb_SEDLMinimum value of the luminosity (1)solLumphys.luminosity;stat.minfloatB_SEDLMaximum value of the luminosity (1)solLumphys.luminosity;stat.maxfloatF275W? Magnitude WFC3/UVIS F275W (2)magphot.mag;em.UV.200-300nmfloatnullablee_F275W? Error on the F275W magnitude (2)magstat.errorfloatnullableF336W? Magnitude WFC3/UVIS F336W (2)magphot.mag;em.opt.Ufloatnullablee_F336W? Error on the F336W magnitude (2)magstat.errorfloatnullableF435WMagnitude ACS/WFC F435W (2)magphot.mag;em.opt.Bfloate_F435WError on the F435W magnitude (2)magstat.errorfloatF606WMagnitude ACS/WFC F606W (2)magphot.mag;em.opt.Rfloate_F606WError on the F606W magnitude (2)magstat.errorfloatF814WMagnitude ACS/WFC F814W (2)magphot.mag;em.opt.Ifloate_F814WError on the F814W magnitude (2)magstat.errorfloatNoteAlternative star name and identification of the blue straggler stars (3)meta.notecharJ/A+A/677/A86/tableb6SED fit results (Teff fixed) for {omega} CenTeffspectroEffective temperature from the spectroscopic fitKphys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSEDlogthetaSolid angle {theta} (2*R/D) in logphys.area;instrfloatb_SEDlogthetaMinimum value of log {theta} (1)arith.zp;stat.minfloatB_SEDlogthetaMaximum value of log {theta} (1)arith.zp;stat.maxfloatSEDRRadiussolRadphys.size.radiusfloatb_SEDRMinimum value of the radius (1)solRadphys.size.radius;stat.minfloatB_SEDRMaximum value of the radius (1)solRadphys.size.radius;stat.maxfloatSEDMMasssolMassphys.massfloatb_SEDMMinimum value of the mass (1)solMassphys.mass;stat.minfloatB_SEDMMaximum value of the mass (1)solMassphys.mass;stat.maxfloatSEDLLuminositysolLumphys.luminosityfloatb_SEDLMinimum value of the luminosity (1)solLumphys.luminosity;stat.minfloatB_SEDLMaximum value of the luminosity (1)solLumphys.luminosity;stat.maxfloatF225W? Magnitude WFC3/UVIS F225W (2)magphot.mag;em.UV.200-300nmfloatnullablee_F225W? Error on the F225W magnitude (2)magstat.errorfloatnullableF275W? Magnitude WFC3/UVIS F275W (2)magphot.mag;em.UV.200-300nmfloatnullablee_F275W? Error on the F275W magnitude (2)magstat.errorfloatnullableF336W? Magnitude WFC3/UVIS F336W (2)magphot.mag;em.opt.Ufloatnullablee_F336W? Error on the F336 magnitude (2)magstat.errorfloatnullableF390W? Magnitude WFC3/UVIS F390W (2)magphot.mag;em.opt.Bfloatnullablee_F390W? Error on the F390W magnitude (2)magstat.errorfloatnullableF438W? Magnitude WFC3/UVIS F438W (2)magphot.mag;em.opt.Bfloatnullablee_F438W? Error on the F438W magnitude (2)magstat.errorfloatnullableF555WMagnitude WFC3/UVIS F555W (2)magphot.mag;em.opt.Vfloate_F555W? Error on the F555W magnitude (2)magstat.errorfloatnullableF606WMagnitude WFC3/UVIS F606W (2)magphot.mag;em.opt.Rfloate_F606W? Error on the F606W magnitude (2)magstat.errorfloatnullableF775W? Magnitude WFC3/UVIS F775W (2)magphot.mag;em.opt.Ifloatnullablee_F775W? Error on the F775W magnitude (2)magstat.errorfloatnullableF814WMagnitude WFC3/UVIS F814W (2)magphot.mag;em.opt.Ifloate_F814W? Error on the F814W magnitude (2)magstat.errorfloatnullableAnd10F435W? Magnitude ACS/WFC F435W (3)magphot.mag;em.opt.Bfloatnullablee_And10F435W? Error on the F435W magnitude (3)magstat.errorfloatnullableAnd10F625W? Magnitude ACS/WFC F625W (3)magphot.mag;em.opt.Rfloatnullablee_And10F625W? Error on the F625W magnitude (3)magstat.errorfloatnullableBelliniIDID from Bellini+, 2017meta.idintNoteAlternative star name (4)meta.notechar