J/MNRAS/511/814ivo://CDS.VizieR/J/MNRAS/511/814doi:10.26093/cds/vizier.75110814CDSGhosh S.Ninan J.P.Ojha D.K.2025-07-03T20:15:10Z2025-02-14T15:29:37ZCDS support team

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

cds-question@unistra.frgiant-starsspectroscopyinfrared-astronomyline-intensitieseffective-temperaturemetallicityWe explored here the near-infrared H-band atmospheric window aiming to provide quantitative diagnostic tools for deriving stellar parameters, for instance, effective temperature (T_eff_) and metallicity ([Fe/H]), of cool giants (Teff < 5000 K) using low-resolution spectra. We obtained 177 cool giants from the X-shooter spectral library covering a wider metallicity range (-2.35 dex < [Fe/H] < 0.5 dex) than in earlier works. Degrading the spectral resolution to R ~ 1200, we estimated equivalent widths of several important spectral features, and the behaviour of spectral features with stellar parameters are studied. Also, the empirical relations for deriving Teff and [Fe/H] are established in the Bayesian framework. We found that ^12^CO at 1.56 and 1.62 {mu}m, and ^12^CO + MgI at 1.71 {mu}m are the best three T_eff_ indicators with a typical accuracy of 153, 123, and 107 K, respectively. The cubic Bayesian model provides the best metallicity estimator with a typical accuracy of 0.22, 0.28, and 0.24 dex for FeH at 1.62 {mu}m, ^12^CO at 1.64 {mu}m, and Fe I at 1.66 {mu}m, respectively. We also showed a detailed quantitative metallicity dependence of Teff-EWs correlations defining three metallicity groups, supersolar ([Fe/H] > 0.0 dex), solar (-0.3 dex < [Fe/H] < 0.3 dex), and subsolar ([Fe/H] <-0.3 dex), from Hierarchical Bayesian modelling. The difference between the solar and subsolar relationship is statistically significant, but such difference is not evident between the solar and supersolar groups.2022MNRAS.511..814Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/511/814CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/45 : Infrared Spectra for 32 Stars (Johnson+ 1970)J/A+AS/116/239 : H band stellar spectra (Dallier+, 1996)J/ApJ/508/397 : H-band Spectral Standards (Meyer+ 1998)J/ApJS/151/387 : Near-IR spectral library of late-type stars (Ivanov+, 2004)J/ApJS/238/29 : IGRINS spectral library (Park+, 2018)J/A+A/634/A133 : X-Shooter Spectral Library (XSL). DR2 (Gonneau+, 2020)J/A+A/627/A138 : XSL atmospheric parameters (Arentsen+, 2019)J/A+A/641/A44 : Dwarfs, giants and supergiants Equivalent widthsJ/AJ/147/20 : Spectroscopy of 447 nearby M dwarfs (Newton+, 2014)http://xsl.astro.unistra.fr/ : The X-shooter Spectral Libraryhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/511/814https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/511/814http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/511/814https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/511/814https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/511/814http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/511/814GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/511/814/table1 (Stellar parameters and estimated EWs of the spectral features of our cool giants sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/511/814/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/511/814/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/511/814/table1?GETtext/xml+votable180.050000true12.458875-73.18791670.0055555555555555565/8274 6/428 4298 4594 4698 5226 8967 9121 12315 12405 12626 12943 16463 16912 16924 17769 18028 18425 18945 19448 19809 20132 20390 20797 21017 21209 21269 21389 21515 21561 21666 21974 22001 22103 22130 22181 22202 22213 22220 22305 22311 22331-22332 22334 22353 22424-22425 22971 23421 23568 23616 23632 25278 25851 26109 26228 26312 26366 26952 27641 27694 27871 28067 28584 28716 28768 28770 28778 28823 28864 28966 29084 29769 30132 30316 30328 30363 30435 30452 30459 30616 30709 31069 31826 33027 33054 33076 33078 33089 33091-33092 33103 33113 33124 33295 33299 33306 33316-33317 35742 35813 37664 37843 39258 39413 39745 40337 40795 42076 42274 42955 43227 47852-47853 48824https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/511/814?format=asciiInfrareddefaultJ/MNRAS/511/814/table1Stellar parameters and estimated EWs of the spectral features of our cool giants samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEW(Fe166)Equivalent width of Fe I at 1.66 {mu}m (Fe166)0.1nmspect.line.eqWidth;em.IR.HdoubleTeffEffective temperature adopted from Arentsen et al. (2019A&A...627A.138A, Cat. J/A+A/627/A138) that are derived using the full-spectrum fits (Teff)Kphys.temperature.effectiveinte_TeffTeff uncertainty (TeffE)Kstat.error;phys.temperature.effectiveintloggLogarithm of surface gravity adopted from Arentsen et al. (2019A&A...627A.138A, Cat. J/A+A/627/A138) that are derived using the full-spectrum fits (logg)log(cm.s**-2)phys.gravityfloate_logglogg uncertainty (loggE)log(cm.s**-2)stat.errorfloat[Fe/H]Logarithm of iron to hydrogen abundance ratio adopted from Arentsen et al. (2019A&A...627A.138A, Cat. J/A+A/627/A138) that are derived using the full-spectrum fits (Meta)log(Sun)phys.abund.Fe;arith.ratiofloate_[Fe/H]The [Fe/H] uncertainty (MetaE)log(Sun)stat.error;phys.abund.FefloatEW(Mg150)Equivalent width of Mg I at 1.50 {mu}m (Mg150)0.1nmspect.line.eqWidth;em.IR.Jfloate_EW(Mg150)EW(Mg150) uncertainty (Mg150E)0.1nmstat.errorfloatEW(K152)Equivalent width of K I at 1.52 {mu}m (K152)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(K152)EW(K152) uncertainty (K152E)0.1nmstat.errorfloatEW(Fe153)Equivalent width of Fe I at 1.53 {mu}m (Fe153)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(Fe153)EW(Fe153) uncertainty (Fe153E)0.1nmstat.errorfloatEW(H155)Equivalent width of H I at 1.55 {mu}m (H155)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(H155)EW(H155) uncertainty (H155E)0.1nmstat.errorfloatEW(CO156)Equivalent width of 12^CO^ at 1.56 {mu}m (CO156)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(CO156)EW(CO156) uncertainty (CO156E)0.1nmstat.errorfloatEW(H157)Equivalent width of H I at 1.57 {mu}m (H157)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(H157)EW(H157) uncertainty (H157E)0.1nmstat.errorfloatEW(Mg157)Equivalent width of Mg I at 1.57 {mu}m (Mg157)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(Mg157)EW(Mg157) uncertainty (Mg157E)0.1nmstat.errorfloatEW(FeH158)Equivalent width of FeH at 1.58 {mu}m (FeH158)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(FeH158)EW(FeH158) uncertainty (FeH158E)0.1nmstat.errorfloatEW(Si159)Equivalent width of Si I at 1.59 {mu}m (Si159)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(Si159)EW(Si159) uncertainty (Si159E)0.1nmstat.errorfloatEW(CO160)Equivalent width of 12^CO^ at 1.60 {mu}m (CO160)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(CO160)EW(CO160) uncertainty (CO160E)0.1nmstat.errorfloatEW(Fe161)Equivalent width of Fe I at 1.61 {mu}m (Fe161)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(Fe161)EW(Fe161) uncertainty (Fe161E)0.1nmstat.errorfloatEW(H161)Equivalent width of H I at 1.61 {mu}m (H161)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(H161)EW(H161) uncertainty (H161E)0.1nmstat.errorfloatEW(CO162)Equivalent width of 12^CO^ at 1.62 {mu}m (CO162)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(CO162)EW(CO162) uncertainty (CO162E)0.1nmstat.errorfloatEW(FeH162)Equivalent width of FeH at 1.62 {mu}m (FeH162)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(FeH162)EW(FeH162) uncertainty (FeH162E)0.1nmstat.errorfloatEW(CO164)Equivalent width of 12^CO^ 1.64 {mu}m (CO164)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(CO164)EW(CO164) uncertainty (CO164E)0.1nmstat.errorfloate_EW(Fe166)EW(Fe166) uncertainty (Fe166E)0.1nmstat.errorfloatEW(CO166)Equivalent width of 12^CO^ at 1.66 {mu}m (CO166)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(CO166)EW(CO166) uncertainty (CO166E)0.1nmstat.errorfloatEW(Al167)Equivalent width of Al I at 1.67 {mu}m (Al167)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(Al167)EW(Al167) uncertainty (Al167E)0.1nmstat.errorfloatEW(H168)Equivalent width of H I at 1.68 {mu}m (H168)0.1nmspect.line.eqWidth;em.IR.Hdoublee_EW(H168)EW(H168) uncertainty (H168E)0.1nmstat.errorfloatEW(COMg171)Equivalent width of 12^CO^ + MgI at 1.71{mu}m (COMg171)0.1nmspect.line.eqWidth;em.IR.Hfloate_EW(COMg171)EW(COMg171) uncertainty (COMg171E)0.1nmstat.errorfloat_RAPosition from Simbad and from X-Shooter Spectral Library (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad and from X-Shooter Spectral Library (declination part)degpos.eq.dec;meta.mainNameStar name (StarName)meta.id;meta.maincharSimbadNameSimbad column added by the CDSmeta.idcharnullable