J/ApJ/949/86ivo://CDS.VizieR/J/ApJ/949/86CDSAfsar M.Bozkurt Z.Topcu G.B.Ozdemir S.Sneden C.Mace G.N.,Jaffe D.T.Lopez-Valdivia R.2025-08-28T12:50:58Z2025-08-28T13:38:18ZCDS support team

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

cds-question@unistra.frchemical-abundanceseffective-temperatureinfrared-astronomyspectroscopyhorizontal-branch-starsDetermining accurate effective temperatures of stars buried in the dust-obscured Galactic regions is extremely difficult from photometry. Fortunately, high-resolution infrared spectroscopy is a powerful tool for determining the temperatures of stars with no dependence on interstellar extinction. It has long been known that the depth ratios of temperature-sensitive and relatively insensitive spectral lines are excellent temperature indices. In this work, we provide the first extensive line depth ratio (LDR) method application in the infrared region that encompasses both the H and K bands (1.48{mu}m-2.48{mu}m). We applied the LDR method to high-resolution (R~45000) H- and K-band spectra of 110 stars obtained with the Immersion Grating Infrared Spectrograph. Our sample contained stars with 3200<Teff(K)<5500, 0.20<=logg<4.6, and -1.5<[M/H]<0.5. The application of this method in the K band yielded 21 new LDR-Teff relations. We also report five new LDR-Teff relations found in the H-band region, augmenting the relations already published by other groups. The temperatures found from our calibrations provide reliable temperatures within ~70K accuracy compared to spectral Teff values from the literature.2023ApJ...949...86Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/949/86CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+AS/117/227 : Dwarf effective temperatures (Alonso+ 1996)J/A+A/333/231 : O-M stars model atmospheres (Bessell+ 1998)J/ApJS/124/527 : Oscillator strengths for lines in J & H (Melendez+, 1999)J/AN/321/277 : Effective temperatures of K-M giants (Strassmeier+, 2000)J/A+A/411/559 : Effective temperature for 181 F-K dwarfs (Kovtyukh+, 2003)J/PASJ/57/27 : Atmospheric parameters of nearby F-K stars (Takeda+, 2005)J/MNRAS/371/879 : Effective temperatures of 215 FGK giants (Kovtyukh+, 2006)J/A+A/450/735 : Effective temperatures and radii of stars (Masana+, 2006)J/AN/328/938 : Teff/line-depth ratio for ELODIE spectra (Biazzo+, 2007)J/A+A/475/1003 : Stellar parameters of G and K giant stars (Hekker+, 2007)J/A+A/497/497 : Physical param. from JHK flux (Gonzalez-Hernandez+, 2009)J/A+A/536/A71 : Atmospheric parameters of nearby giant stars (Jones+, 2011)J/A+A/531/A165 : MILES atmospheric parameters (Prugniel+, 2011)J/A+A/538/A143 : Atmospheric param. of stars for UV models (Koleva+, 2012)J/A+A/547/A13 : Homogeneous sample of F6-K4 Hyades stars (Tabernero+, 2012)J/A+A/554/A84 : Abundances of evolved stars (Maldonado+, 2013)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)J/AJ/147/137 : Atmospheric parameters in luminous stars (Luck, 2014)J/MNRAS/446/3562 : Abundances of red giants in NGC752 (Bocek Topcu+, 2015)J/A+A/580/A24 : Abundances in dwarfs, subgiants & giants (da Silva+, 2015)J/A+A/574/A50 : Chemical abundances of giants and subgiants (Jofre+, 2015)J/ApJS/221/24 : SDSS-III APOGEE H-band spectral line lists (Shetrone+, 2015)J/ApJ/819/103 : Abundances of two very metal-poor stars (Afsar+, 2016)J/MNRAS/463/580 : Abundances of red giants in NGC6940 (Bocek+, 2016)J/ApJ/817/40 : High-res. NIR spectra of local giants (Feuillet+, 2016)J/A+A/606/A94 : Chemical abundances of 1059 FGK stars (Delgado Mena+, 2017)J/A+A/598/A100 : Abundances of disk giants: O, Mg, Ca and Ti (Jonsson+, 2017)J/AJ/153/21 : The local region abund. II. F, G & K dwarfs (Luck+, 2017)J/AJ/155/240 : A spectroscopic survey of field RHB stars (Afsar+, 2018)J/ApJS/238/29 : IGRINS spectral library (Park+, 2018)J/ApJ/879/105 : Effective temp. of low-mass stars (Lopez-Valdivia+, 2019)J/MNRAS/491/544 : NGC752 abundances from IR spectra (Bocek Topcu+, 2020)J/MNRAS/494/1724 : Effect of surface gravity on line-depth ratios (Jian+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/949/86https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/949/86http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/949/86https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/949/86https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/949/86http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/949/86GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/949/86/table1 (Atmospheric parameters of stellar sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/949/86/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/949/86/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/949/86/table1?GETtext/xml+votable180.050000true247.160623341.88167920.0055555555555555566/735 2317 2376 2545 2622 2781 3251 3263 3343 3616 3650 3881 4181 4526 4574 4839 4929 5004 5009 5109 5239 5322 5346 5438 5465 5488 5689 5700 5718 5741 5982 6466 6898 8372 8518 8685 8721 8821 9029 9083 9087 9192 9753 9813 9843 9851 10376 10447 10495 10520 10696 10886 10968 11065 11184 11356 11441 11806 11929 12942 13043 14494 14878 15012 15106 17671 17856 17910 19672 21690 22813 23731 23735 24013 24374 24396 24877 24920 25051 25080 25200 25324 25461 25583 25735 25821 26246 26276 26552 27384 27509 27513 27604 28058 28083 28103 28202 28350 28444 28487 28517 29657 31369 33003 33371 35101 36501 36546 44025 45050https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/949/86?format=asciiInfrareddefaultJ/ApJ/949/86/table1Atmospheric parameters of stellar samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharprimaryTeff[3250/5464] Effective temperatureKphys.temperature.effectiveintlog(g)[0.2/4.59] log surface gravitylog(cm.s**-2)phys.gravityfloat[M/H][-1.48/0.44] Metallicitylog(Sun)phys.abund.ZfloatVTurb[0.19/3.49] Turbulent velocitykm/sphys.veloc.microTurbfloatRef[1/26] Reference (1)meta.bibintP18Display data from the IGRINS spectral library (Parks+ 2018, J/ApJS/238/29)meta.ref.urlintnullableA18Display data from Afsar+ 2018, J/AJ/155/240meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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.mainJ/ApJ/949/86/table4*Teff values of our from various sources: spectral Teff values from Table 1, T_LDR_ (this study), Teff from Gaia, and Teff(J-K)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharprimaryTeff[3250/5464] Effective temperature from Table 1Kphys.temperature.effectiveintTLDR[3279/5360] Effective temperature from line depth ratioKphys.temperature.effectiveintTGaia[3851/5613]? Effective temperature from GaiaKphys.temperature.effectiveintnullableT(J-K)[3451/6449]? Effective temperature from (J-K) colorKphys.temperature.effectiveintnullable