J/MNRAS/501/4596ivo://CDS.VizieR/J/MNRAS/501/4596CDSGhosh S.Ojha D.K.Ninan J.P.2024-06-05T16:11:24Z2023-11-15T09:21:37ZCDS support team

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

cds-question@unistra.frgiant-starseffective-temperaturemetallicityline-intensitiesmilky-way-galaxymagellanic-cloudsinfrared-astronomyspectroscopyWe present here quantitative diagnostic tools for cool giants that employ low-resolution near-infrared spectroscopy in the K band for stellar population studies. In this study, a total of 260 cool giants (177 stars observed with X-shooter and 83 stars observed with NIFS) are used covering a wider metallicity range than in earlier works. We measure equivalent widths of some of the selected important K-band spectral features like NaI, FeI, and ^12^CO after degrading the spectral resolution (R~1200) to investigate the spectral behaviour with fundamental parameters (e.g. effective temperature and metallicity). We derive empirical relations to measure effective temperature using the ^12^CO first-overtone band at 2.29 and 2.32{mu}m and show a detailed quantitative metallicity dependence of these correlations. We find that the empirical relations based on solar-neighborhood stars can incorporate large uncertainty in evaluating T_eff_ for metal-poor or metal-rich stars. Furthermore, we explore all the spectral lines to establish the empirical relation with metallicity and find that the quadratic fit of the combination of NaI and ^12^CO at 2.29{mu}m lines yields a reliable empirical relation at [Fe/H]~<-0.4dex, while a linear fit of any line offers a good metallicity scale for stars having [Fe/H]>~0.0dex.2021MNRAS.501.4596Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/501/4596CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/808/106 : NIR spectroscopic obs. in the Galactic CenterJ/ApJ/809/143 : K-band spectra of stars within central 1pc of the MWJ/A+A/634/A133 : X-Shooter Spectral Library (XSL). DR2 (Gonneau+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/501/4596https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/501/4596http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/501/4596https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/501/4596https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/501/4596http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/501/4596GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/501/4596/table1 (Fundamental parameters and measured EWs of the sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/501/4596/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/501/4596/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/501/4596/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 28830 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/501/4596?format=asciiInfrareddefaultJ/MNRAS/501/4596/table1Fundamental parameters and measured EWs of the samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharSpectraOrigin of the spectra (X-shooter or NIFS)meta.id;instrcharTeffEffective temperatureKphys.temperature.effectiveinte_TeffError on TeffKstat.error;phys.temperature.effectiveint[Fe/H]Fe/H abundance ratiophys.abund.Fe;arith.ratiofloate_[Fe/H]Error on [Fe/H]stat.error;phys.abund.FefloatEWNaIEquivalent width of the NaI line0.1nmspect.line.eqWidthfloate_EWNaIError on EWNaI0.1nmstat.errorfloatEWFeIEquivalent width of the FeI line0.1nmspect.line.eqWidthfloate_EWFeIError on EWFeI0.1nmstat.errorfloatEWCO229Equivalent width of the CO 2.29um line0.1nmspect.line.eqWidthfloate_EWCO229Error on EWCO2290.1nmstat.errorfloatEWCO232Equivalent width of the CO 2.32um line0.1nmspect.line.eqWidthfloate_EWCO232Error on EWCO2320.1nmstat.errorfloatSimbadNameSimbad column added by the CDSmeta.idcharnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main