J/MNRAS/493/4533ivo://CDS.VizieR/J/MNRAS/493/4533doi:10.26093/cds/vizier.74934533CDSKhata D.Mondal S.Das R.Ghosh S.Ghosh S.2024-08-20T20:16:43Z2023-07-24T08:43:57ZCDS support team

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

cds-question@unistra.frm-starsdwarf-starsline-intensitieseffective-temperaturestellar-massesstellar-radiistellar-spectral-typesinfrared-astronomyspectroscopyWe present here medium resolution ({lambda}/{Delta}{lambda}~1200) H- and K-band spectra of M-type dwarf stars covering the wavelength ranges 1.50-1.80{mu}m and 1.95-2.45{mu}m. The sample includes 53 dwarf stars (M0V-M7V) from new observations using the TIFR Near-Infrared Spectrometer and Imager instrument on the 2-m Himalayan Chandra Telescope. Using interferometrically measured effective temperature (T_eff_), radius and luminosity of nearby bright calibrator stars, we have created new empirical relationships among those fundamental parameters and spectral indices. The equivalent widths of H-band spectral features like Mg (1.57{mu}m), Al (1.67{mu}m) and Mg (1.71{mu}m), and the H_2_O-H index are found to be good indicators of T_eff_, radius and luminosity and we establish linear functions using these features relating to those stellar parameters. The root-mean-squared error of our best fits are 102K, 0.027R_{sun}_ and 0.12dex respectively. Using spectral-type standards along with known parallaxes, we calibrate both H- and K-band H_2_O indices as a tracer of spectral type and absolute K_s_ magnitude. Metallicities of M-dwarf samples are estimated using the K-band calibration relationships. The masses of M dwarfs could be determined using the luminosity (L/L_{sun}_) and we establish a new empirical relation for this. We also compare and contrast our results with other similar work from the literature.2020MNRAS.493.4533Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/4533CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/4533https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/4533http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/4533https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/4533https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/4533http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/4533GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/493/4533/table1 (Log of H- and K-band spectroscopic observations using 2-m HCT and observational properties of M dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/4533/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/4533/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/4533/table1?GETtext/xml+votable180.050000true69.420541752.89361390.0055555555555555566/250 811 1033 1122 1875 1938 2737 3293 3345 3791 4158 4708 5009 5420 6384 6672 6879 6974 7103 7264 8023 8843 9696 10149 11034 12890 13688 13743 18761 19466 22040 22309 22325 22709 22807 23564 23735 24227 24362 26555 26560 26583 26972 27459 27462 27731 27762 28343 28548 30771 32491 449218.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/493/4533?format=asciiInfrareddefaultJ/MNRAS/493/4533/table1Log of H- and K-band spectroscopic observations using 2-m HCT and observational properties of M dwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharKsmag2MASS Ks-band magnitudemagphot.mag;em.IR.KfloatExpTimeExposure timestime.duration;obs.exposureintNameStar namemeta.id;meta.maincharprimaryf_NameFlag on Name (1)meta.codecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDateObservation datetime.epoch;obscharNframeNumber of framesmeta.numberintSNRHSignal to noise ratio on the H-bandstat.snrintSNRKSignal to noise ratio on the K-bandstat.snrintTypeStar typesrc.classcharr_TypeReference for Type (2)meta.noteintMoreLink to Tables 2,4,5,6,7,8 and 9meta.ref.urlcharWeatherWeather conditionsmeta.notecharJ/MNRAS/493/4533/table2Estimation of EWs and H_2_O indices in the H and K bands for the TIRSPEC M-dwarf samplesEW1.57? Equivalent width of the 1.57um MgI line0.1nmspect.line.widthfloatnullablee_EW1.57? Error on EW1.570.1nmstat.errorfloatnullableEW1.67? Equivalent width of the 1.67um Al-a line0.1nmspect.line.widthfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinte_EW1.67? Error on EW1.670.1nmstat.errorfloatnullableEW1.71? Equivalent width of the 1.71um MgI line0.1nmspect.line.widthfloatnullablee_EW1.71? Error on EW1.710.1nmstat.errorfloatnullableH2O-HH-band water indexspect.indexfloate_H2O-HError on H2O-Hstat.errorfloatEW2.21Equivalent width of the 2.21um NaI line0.1nmspect.line.widthfloate_EW2.21Error on EW2.210.1nmstat.errorfloatEW2.26? Equivalent width of the 2.26um CaI line0.1nmspect.line.widthfloatnullablee_EW2.26? Error on EW2.260.1nmstat.errorfloatnullableH2O-KK-band water indexspect.indexfloate_H2O-KError on H2O-Kstat.errorfloatNameStar namemeta.id;meta.maincharJ/MNRAS/493/4533/table3Spectral features and continuum pointsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFeatureSpectral featuremeta.id;spect.linecharRef[ab] Reference of the given wavelengths (1)meta.ref;em.wlcharwindminFeature window (minimum wavelength) (2)umem.wlfloatwindmaxFeature window (maximum wavelength) (2)umem.wlfloatblueminBlue continuum (minimum wavelength) (2)umem.wlfloatbluemaxBlue continuum (maximum wavelength) (2)umem.wlfloatredminRed continuum (minimum wavelength) (2)umem.wlfloatredmaxRed continuum (maximum wavelength) (2)umem.wlfloatJ/MNRAS/493/4533/table4Inferred T_eff_, radius and L_bol_ for the calibration samplese_RadmError on RadmsolRadstat.errorfloatlogLbolm? Logarithm of the measured bolometric luminositylog(solLum)phys.luminosityfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharf_Name[ab] Flag on Name (1)meta.codecharTeffmMeasured effective temperatureKphys.temperature.effectiveinte_TeffmError on TeffmKstat.errorintRadmMeasured star radiussolRadmeta.idfloate_logLbolm? Error on logLbolmlog(solLum)stat.errorfloatnullableTeffiInferred effective temperature (G1)Kphys.temperature.effectivefloate_TeffiError on TeffiKstat.errorintRadiInferred star radius (G2)solRadmeta.idfloate_RadiError on RadisolRadstat.errorfloatlogLboli? Logarithm of the measured bolometric luminosity (G3)log(solLum)phys.luminosityfloatnullablee_logLboli? Error on logLbolilog(solLum)stat.errorfloatnullableJ/MNRAS/493/4533/table5M-dwarf spectral-type calibration samplesNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintH2O-HH-band water indexspect.indexfloatH2O-KK-band water indexspect.indexfloatSpTypesSpectral type from the Palomar/MSU nearby star spectroscopic surveysrc.spTypecharr_SpTypeiReference used to establish the calibration relation (1)meta.ref;pos.framecharSpTypeiSpectral type inferred from the water indicessrc.spTypecharJ/MNRAS/493/4533/table6List of objects used as calibrators to estimate M_k_NameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKsmag2MASS Ks-band magnitudemagphot.mag;em.IR.KfloatplxParallax (1)maspos.parallax.trigfloatKsMAGAbsolute Ks-band magnitude (G4)magphot.magfloatJ/MNRAS/493/4533/table7M-dwarf metallicity calibration samplesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharSpTypeSpectral typesrc.spTypechar[Fe/H]Fe/H abundance ratio from the SPOCS I cataloguephys.abund.Fe;arith.ratiofloat[M/H]? Total metallicity from the SPOCS I cataloguephys.abund.Zfloatnullable[Fe/H]pPredicted Fe/H abundance ratiophys.abund.Fe;arith.ratiofloat[M/H]p? Predicted total metallicityphys.abund.ZfloatnullableJ/MNRAS/493/4533/table8Mass calibration samplesRef[ab] Reference (1)meta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharMstarStar masssolMassphys.massfloate_MstarError on MstarsolMassstat.errorfloatLstarStar luminositysolLumphys.luminositydoublee_LstarError on LstarsolLumstat.errordoubleJ/MNRAS/493/4533/table9Estimated stellar parameters for our observed (2-m HCT) M dwarfsSpTypeSpectral type (1)src.spTypecharNameStar namemeta.id;meta.maincharDistSpectroscopic distance (3)pcpos.distancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeff? Effective temperature (G1)Kphys.temperature.effectiveintnullablee_Teff? Error on TeffKstat.error;phys.temperature.effectiveintnullableRad? Star radius (G2)solRadphys.size.radiusfloatnullablee_Rad? Error on RadsolRadstat.errorfloatnullablelogL? Logarithm of the star luminosity (G3)log(solLum)phys.luminosityfloatnullablee_logL? Error on logLlog(solLum)stat.errorfloatnullableMass? Stellar mass (2)solMassphys.massfloatnullablee_Mass? Error on MasssolMassstat.error;phys.massfloatnullableKsMAGAbsolute Ks-band magnitude (G4)magphot.magfloate_KsMAGError on KsMAGmagstat.errorfloate_DistError on Distpcstat.errorfloat[M/H]? Total metallicity (4)phys.abund.Zfloatnullablee_[M/H]? Error on [M/H]stat.error;phys.abundfloatnullable[Fe/H]? Fe/H abundance ratio (4)phys.abund.Fe;arith.ratiofloatnullablee_[Fe/H]? Error on [M/H]stat.error;phys.abund.FefloatnullableJ/MNRAS/493/4533/tablea1EW of MgI (1.57um) for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintEW1? Equivalent width of the MgI (1.57um) feature for logg=4.5 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW2? Equivalent width of the MgI (1.57um) feature for logg=4.5 and [Fe/H]=-0.50.1nmspect.line.eqWidthfloatnullableEW3? Equivalent width of the MgI (1.57um) feature for logg=5.0 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW4? Equivalent width of the MgI (1.57um) feature for logg=5.0 and [Fe/H]=0.50.1nmspect.line.eqWidthfloatnullableJ/MNRAS/493/4533/tablea2EW of Al-a (1.67um) for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintEW1Equivalent width of the Al-a (1.67um) feature for logg=4.5 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatEW2Equivalent width of the Al-a (1.67um) feature for logg=4.5 and [Fe/H]=-0.50.1nmspect.line.eqWidthfloatEW3Equivalent width of the Al-a (1.67um) feature for logg=5.0 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatEW4Equivalent width of the Al-a (1.67um) feature for logg=5.0 and [Fe/H]=0.50.1nmspect.line.eqWidthfloatJ/MNRAS/493/4533/tablea3EW of MgI (1.71um) for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintEW1? Equivalent width of the MgI (1.71um) feature for logg=4.5 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW2? Equivalent width of the MgI (1.71um) feature for logg=4.5 and [Fe/H]=-0.50.1nmspect.line.eqWidthfloatnullableEW3? Equivalent width of the MgI (1.71um) feature for logg=5.0 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW4? Equivalent width of the MgI (1.71um) feature for logg=5.0 and [Fe/H]=0.50.1nmspect.line.eqWidthfloatnullableJ/MNRAS/493/4533/tablea4EW of NaI (2.21um) for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintEW1Equivalent width of the NaI (2.21um) feature for logg=4.5 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatEW2Equivalent width of the NaI (2.21um) feature for logg=4.5 and [Fe/H]=-0.50.1nmspect.line.eqWidthfloatEW3? Equivalent width of the NaI (2.21um) feature for logg=5.0 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW4Equivalent width of the NaI (2.21um) feature for logg=5.0 and [Fe/H]=0.50.1nmspect.line.eqWidthfloatJ/MNRAS/493/4533/tablea5EW of CaI (2.26um) for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintEW1? Equivalent width of the CaI (2.26um) feature for logg=4.5 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW2Equivalent width of the CaI (2.26um) feature for logg=4.5 and [Fe/H]=-0.50.1nmspect.line.eqWidthfloatEW3? Equivalent width of the CaI (2.26um) feature for logg=5.0 and [Fe/H]=0.00.1nmspect.line.eqWidthfloatnullableEW4Equivalent width of the CaI (2.26um) feature for logg=5.0 and [Fe/H]=0.50.1nmspect.line.eqWidthfloatJ/MNRAS/493/4533/tablea6H-band H_2_O index for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintH2O-H1H-band water index for logg=4.5 and [Fe/H]=0.0spect.indexfloatH2O-H2H-band water index for logg=4.5 and [Fe/H]=-0.5spect.indexfloatH2O-H3H-band water index for logg=5.0 and [Fe/H]=0.0spect.indexfloatH2O-H4H-band water index for logg=5.0 and [Fe/H]=0.5spect.indexfloatJ/MNRAS/493/4533/tablea7K-band H_2_O index for the BT-Settl model spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveintH2O-K1K-band water index for logg=4.5 and [Fe/H]=0.0spect.indexfloatH2O-K2K-band water index for logg=4.5 and [Fe/H]=-0.5spect.indexfloatH2O-K3? K-band water index for logg=5.0 and [Fe/H]=0.0spect.indexfloatnullableH2O-K4K-band water index for logg=5.0 and [Fe/H]=0.5spect.indexfloat