J/MNRAS/493/871ivo://CDS.VizieR/J/MNRAS/493/871doi:10.26093/cds/vizier.74930871CDSGarcia-Vargas M.L.Carrasco E.Molla M.Gil de Paz A.Berlanas S.R.,Cardiel N.Gomez-Alvarez P.Gallego J.Iglesias-Paramo J.Cedazo R.,Pascual S.Castillo-Morales A.Perez-Calpena A.Martinez-Delgado I.2024-09-02T20:15:49Z2023-06-26T15:28:58ZCDS support team

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

cds-question@unistra.frstellar-spectral-typeseffective-temperaturechemical-abundancesline-intensitiesvisible-astronomyspectroscopyinfrared-photometrybroad-band-photometryMEGARA (Multi Espectrografo en GTC de Alta Resolucion para Astronomia) is an optical (3650-9750{AA}), fibre-fed, medium-high spectral resolution (R=6000, 12000 and 20000) instrument for the Gran Telescopio CANARIAS (GTC) 10.4-m telescope, commissioned in the summer of 2017, and currently in operation. The scientific exploitation of MEGARA requires a stellar spectra library to interpret galaxy data and to estimate the contribution of the stellar populations. In this paper, we introduce the MEGARA-GTC spectral library, detailing the rationale behind the building of this catalogue. We present the spectra of 97 stars (21 individual stars and 56 members of the globular cluster M15, which are both subsamples taken during the commissioning runs, and 20 stars from our ongoing GTC Open-Time programme). The spectra have R=20000 in the HR-R and HR-I set-ups, centred at 6563 and 8633{AA}, respectively. We describe the procedures to reduce and analyse the data. Then, we determine the best-fitting theoretical models to each spectrum through a {chi}^2^ minimization technique, to derive the stellar physical parameters, and we discuss the results. We have also measured some absorption lines and indices. Finally, we introduce our project to complete the library and the data base in order to make the spectra available to the community.2020MNRAS.493..871Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/871CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/326/959 : Empirical calibration of the near-IR Ca tripletJ/MNRAS/396/1895 : MgI and sTiO index definitions (Cenarro+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/871https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/871http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/871https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/871https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/871http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/871GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/493/871/table4 (MEGARA-GTC stellar library catalogue sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/871/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/871/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/871/table4?GETtext/xml+votable180.050000true15.90208323.7684440.005555555555555556Cone search capability for table J/MNRAS/493/871/table5 (Sub21 stars observed with the HR-I spectral configuration during MEGARA commissioning between 2017 June and August)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/871/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/871/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/871/table5?GETtext/xml+votable180.050000true308.294734441.25228390.005555555555555556Cone search capability for table J/MNRAS/493/871/table6 (Sub20 OT stars observed with HR-R and HR-I set-ups from the programme 35-GTC22/18B)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/871/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/871/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/871/table6?GETtext/xml+votable180.050000true245.524266130.89199580.0055555555555555566/798 1218 1603 1749 2923 2927 3146 3587 3719 5490 7542 9197 9373 9733 9936 10302 11492 11927 12030 12295 12621 12765 12792 13667 13763 14179 14252 14329 14654 14692 14740 14901 14951 15237 17538 17573 18035 18302 18911 18915 19733 19825 19830 19924 20110 20373 20402 28006 30452 30709 316501.398457827073138e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/493/871?format=asciiOpticalInfrareddefaultJ/MNRAS/493/871/table2MEGARA spectral configurations as measured at the GTClmin1Shortest wavelength of the central fibre spectrum0.1nminstr.filter;em.wl.centralfloatlminShortest wavelength common to all spectra0.1nminstr.filter;em.wl.centralfloatlcCentral wavelength0.1nminstr.filter;em.wl.centralfloatlmaxLongest wavelength for all spectra0.1nminstr.filter;em.wl.centralfloatlmax1Longest wavelength of the central fibre spectrum0.1nminstr.filter;em.wl.centralfloatDispConstant linear reciprocal dispersion0.1nm/pixinstr.dispersionfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVPHSet-up or name of the volume phase holographic (VPH) gratingsinstr.setupcharJ/MNRAS/493/871/table3Existing stellar libraries used for MEGARA-GTC library input cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLibraryName of the librarymeta.id;meta.datasetcharResResolving powerspect.resolutionintlambdaminSpectral range (minimum wavelength value)instr.bandwidthintlambdamaxSpectral range (maximum wavelength value)instr.bandwidthintNstarsNumber of starsmeta.numberintset-up[LR/MR/HR] MEGARA set-up (1)instr.setupcharRefReferencemeta.ref;pos.framecharJ/MNRAS/493/871/table4MEGARA-GTC stellar library catalogue samplelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainpmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.radoublepmDEProper motion in declinationmas/yrpos.pm;pos.eq.decdoubleSpTypeSpectral type and luminosity classsrc.spTypecharVmagJohnson V-band magnitudemagphot.mag;em.opt.VfloatRmag? Johnson R-band magnitudemagphot.mag;em.opt.RfloatnullableImag? Johnson I-band magnitudemagphot.mag;em.opt.IfloatnullableJmag? Johnson J-band magnitude5magphot.mag;em.IR.JfloatnullableTeff? Effective temperatureKphys.temperature.effectiveintnullable[M/H]? Metallicityphys.abund.ZfloatnullableLibraryName of the librarymeta.id;meta.datasetcharJ/MNRAS/493/871/table5Sub21 stars observed with the HR-I spectral configuration during MEGARA commissioning between 2017 June and AugustImag? Johnson I-band magnitudemagphot.mag;em.opt.IfloatnullableNameStar namemeta.id;meta.maincharSimbadSimbad column added by the CDSmeta.ref.urlcharDateObservation datetime.epoch;obsnullableExpTimeExposure timestime.duration;obs.exposurechar_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.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay data from all tablesmeta.ref.urlcharSpTypeSpectral type and luminosity classsrc.spTypecharUmag? Johnson U-band magnitudemagphot.mag;em.opt.UfloatnullableBmagJohnson B-band magnitudemagphot.mag;em.opt.BfloatVmagJohnson V-band magnitudemagphot.mag;em.opt.VfloatRmag? Johnson R-band magnitudemagphot.mag;em.opt.RfloatnullableJ/MNRAS/493/871/table6Sub20 OT stars observed with HR-R and HR-I set-ups from the programme 35-GTC22/18BSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay data from all tablesmeta.ref.urlcharNameStar namemeta.id;meta.maincharSpTypeSpectral type and luminosity classsrc.spTypecharUmag? Johnson U-band magnitudephot.mag;em.opt.UfloatnullableBmagJohnson B-band magnitudephot.mag;em.opt.BfloatVmagJohnson V-band magnitudephot.mag;em.opt.VfloatRmag? Johnson R-band magnitudephot.mag;em.opt.RfloatnullableImag? Johnson I-band magnitudephot.mag;em.opt.IfloatnullableDateObservation datetime.epoch;obsnullableExpTimeRExposure time for HR-R set-upstime.duration;obs.exposurecharExpTimeIExposure time for HR-I set-upstime.duration;obs.exposurecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Fe/H abundance ratiophys.abund.Fe;arith.ratiocharLibraryName of the librarymeta.id;meta.datasetchar_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/MNRAS/493/871/table7Stellar parameters for the 21 commissioning stars derived from the fitting with the theoretical models for the HR-I set-up, and from the literatureNNumber of modelsmeta.numberintTefflit? Effective temperature from literatureKphys.temperature.effectiveintnullablee_Tefflit? Error on TefflitKstat.errorintnullablee_logglit? Error on logglitlog(cm.s**-2)stat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay data from all tablesmeta.ref.urlcharNameStar namemeta.numbercharchi2minMinimum {chi}^2^ valuestat.fit.chi2floatPmaxMaximum probability associated with chi2minstat.probabilityfloatTeffEffective temperature corresponding the minimum {chi}^2^ valueKphys.temperature.effectiveintloggSurface gravity corresponding the minimum {chi}^2^ valuelog(cm.s**-2)phys.gravityfloat[M/H]Metallicity corresponding the minimum {chi}^2^ valuephys.abund.ZfloatTeffmeanAverage effective temperature of the set of N modelsKphys.temperature.effective;stat.meaninte_TeffmeanError on TeffmeanKstat.errorintloggmeanAverage surface gravity of the set of N modelslog(cm.s**-2)phys.gravity;stat.meanfloate_loggmeanError on loggmeanlog(cm.s**-2)stat.errorfloat[M/H]meanAverage metallicity of the set of N modelsphys.abund.Z;stat.meanfloate_[M/H]meanError on [M/H]meanstat.error;phys.abundfloatlogglit? Surface gravity from literaturelog(cm.s**-2)phys.gravityfloatnullable[M/H]lit? Metallicity from literaturephys.abund.Zfloatnullablee_[M/H]lit? Error on [M/H]litstat.error;phys.abundfloatnullableRefReference (1)meta.ref;pos.framecharJ/MNRAS/493/871/table8Stellar parameters for the M15 stars derived from the fit of the theoretical models to the observed spectra in HR-R and HR-I, and the simultaneous fitting to the combined spectrum with HR-R and HR-INNumber of modelsmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpectraObserved spectra (HR-R, HR-I or the combined spectrum using both HR-R and HR-I)instr.setupcharID[1/56] Internal star identifiermeta.id;meta.mainintchi2minMinimum {chi}^2^ valuestat.fit.chi2floatPmaxMaximum probability associated with chi2minstat.probabilityfloatTeffEffective temperature corresponding the minimum {chi}^2^ valueKphys.temperature.effectiveintloggSurface gravity corresponding the minimum {chi}^2^ valuelog(cm.s**-2)phys.gravityfloat[M/H]Metallicity corresponding the minimum {chi}^2^ valuephys.abund.ZfloatTeffmeanAverage effective temperature of the set of N modelsKphys.temperature.effective;stat.meaninte_TeffmeanError on TeffmeanKstat.errorintloggmeanAverage surface gravity of the set of N modelslog(cm.s**-2)phys.gravity;stat.meanfloate_loggmeanError on loggmeanlog(cm.s**-2)stat.errorfloat[M/H]meanAverage metallicity of the set of N modelsphys.abund.Z;stat.meanfloate_[M/H]meanError on [M/H]meanstat.error;phys.abundfloatJ/MNRAS/493/871/table9Stellar parameters for the 20 OT stars derived from the fitting with the theoretical models and from the literature for the HR-R and HR-I separatelyNINumber of models for HR-I spectrameta.numberintTeffmeanIAverage effective temperature of the set of N models for HR-I spectraKphys.temperature.effective;stat.meaninte_TeffmeanIError on TeffmeanIKstat.errorintloggmeanIAverage surface gravity of the set of N models for HR-I spectralog(cm.s**-2)phys.gravity;stat.meanfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay data from all tablesmeta.ref.urlcharNameStar namemeta.numbercharchi2minRMinimum {chi}^2^ value for HR-R spectrastat.fit.chi2floatPmaxRMaximum probability associated with chi2min for HR-R spectrastat.probabilityfloatTeffREffective temperature corresponding the minimum {chi}^2^ value for HR-R spectraKphys.temperature.effectiveintloggRSurface gravity corresponding the minimum {chi}^2^ value for HR-R spectralog(cm.s**-2)phys.gravityfloat[M/H]RMetallicity corresponding the minimum {chi}^2^ value for HR-R spectraphys.abund.ZfloatNRNumber of models for HR-R spectrameta.numberintTeffmeanRAverage effective temperature of the set of N models for HR-R spectraKphys.temperature.effective;stat.meaninte_TeffmeanRError on TeffmeanRKstat.errorintloggmeanRAverage surface gravity of the set of N models for HR-R spectralog(cm.s**-2)phys.gravity;stat.meanfloate_loggmeanRError on loggmeanRlog(cm.s**-2)stat.errorfloat[M/H]meanRAverage metallicity of the set of N models for HR-R spectraphys.abund.Z;stat.meanfloate_[M/H]meanRError on [M/H]meanRstat.error;phys.abundfloatchi2minIMinimum {chi}^2^ value for HR-I spectrastat.fit.chi2floatPmaxIMaximum probability associated with chi2min for HR-I spectrastat.probabilityfloatTeffIEffective temperature corresponding the minimum {chi}^2^ value for HR-I spectraKphys.temperature.effectiveintloggISurface gravity corresponding the minimum {chi}^2^ value for HR-I spectralog(cm.s**-2)phys.gravityfloat[M/H]IMetallicity corresponding the minimum {chi}^2^ value for HR-I spectraphys.abund.Zfloate_loggmeanIError on loggmeanIlog(cm.s**-2)stat.errorfloat[M/H]meanIAverage metallicity of the set of N models for HR-I spectraphys.abund.Z;stat.meanfloate_[M/H]meanIError on [M/H]meanIstat.error;phys.abundfloatJ/MNRAS/493/871/table10Stellar parameters for the 20 OT stars derived from the fitting with the combined spectrum of both HR-R and HR-I set-upsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay data from all tablesmeta.ref.urlcharNameStar namemeta.numbercharchi2minMinimum {chi}^2^ valuestat.fit.chi2floatPmaxMaximum probability associated with chi2minstat.probabilityfloatTeffEffective temperature corresponding the minimum {chi}^2^ valueKphys.temperature.effectiveintloggSurface gravity corresponding the minimum {chi}^2^ valuelog(cm.s**-2)phys.gravityfloat[M/H]Metallicity corresponding the minimum {chi}^2^ valuephys.abund.ZfloatNNumber of modelsmeta.numberintTeffmeanAverage effective temperature of the set of N modelsKphys.temperature.effective;stat.meaninte_TeffmeanError on TeffmeanKstat.errorintloggmeanAverage surface gravity of the set of N modelslog(cm.s**-2)phys.gravity;stat.meanfloate_loggmeanError on loggmeanlog(cm.s**-2)stat.errorfloat[M/H]meanAverage metallicity of the set of N modelsphys.abund.Zfloate_[M/H]meanError on [M/H]meanstat.error;phys.abundfloatTefflitEffective temperature from literatureKphys.temperature.effectiveintlogglitSurface gravity from literaturelog(cm.s**-2)phys.gravityfloat[M/H]litMetallicity from literaturephys.abund.ZfloatResResolving power of the spectraspect.resolutionintJ/MNRAS/493/871/table11Equivalent widths of the CaII, MgI and Pa lines, and sTiO colour for the sub21 COM stars observed in HR-I and the 20 stars of the OT subsamplee_Ca1MEGError on Ca1MEG0.1nmstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay data from all tablesmeta.ref.urlcharNameStar namemeta.id;meta.maincharS/NContinuum S/N averaged over the whole spectrum as defined by Stoehr et al. (2008ASPC..394..505S)stat.snrintCa1CENEquivalent width of the CaII 8498.03{AA} line (1)0.1nmspect.line.eqWidthfloate_Ca1CENError on Ca1CEN0.1nmstat.errorfloatCa2CENEquivalent width of the CaII 8542.09{AA} line (1)0.1nmspect.line.eqWidthfloate_Ca2CENError on Ca2CEN0.1nmstat.errorfloatCa3CENEquivalent width of the CaII 8662.14{AA} line (1)0.1nmspect.line.eqWidthfloate_Ca3CENError on Ca3CEN0.1nmstat.errorfloatMgIEquivalent width of the MgI 8806.76{AA} line (1)0.1nmspect.line.eqWidthfloate_MgIError on MgI0.1nmstat.errorfloatPa1Equivalent width of the Paschen 8467.3{AA} line (1)0.1nmspect.line.eqWidthfloate_Pa1Error on Pa10.1nmstat.errorfloatPa2Equivalent width of the Paschen 8598.4{AA} line (1)0.1nmspect.line.eqWidthfloate_Pa2Error on Pa20.1nmstat.errorfloatPa3Equivalent width of the Paschen 8750.5{AA} line (1)0.1nmspect.line.eqWidthfloate_Pa3Error on Pa30.1nmstat.errorfloatCa1MEGEquivalent width of the CaII 8498.03{AA} line using the new windows defined in this paper (2)0.1nmspect.line.eqWidthfloatCa2MEGEquivalent width of the CaII 8542.09{AA} line using the new windows defined in this paper (2)0.1nmspect.line.eqWidthfloate_Ca2MEGError on Ca2MEG0.1nmstat.errorfloatCa3MEGEquivalent width of the CaII 8662.14{AA} line using the new windows defined in this paper (2)0.1nmspect.line.eqWidthfloate_Ca3MEGError on Ca3MEG0.1nmstat.errorfloatsTiOsTiO colour as defined by Cenarro et al. (2009MNRAS.396.1895C, Cat. J/MNRAS/396/1895)0.1nmspect.indexfloatJ/MNRAS/493/871/table12Equivalent widths of the CaII, MgI and Pa lines, and sTiO colour for the 56 stars in the M15 sub observed in HR-I during MEGARA commissioningrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharS/NContinuum S/N averaged over the whole spectrum as defined by Stoehr et al. (2008ASPC..394..505S)stat.snrintCa1CENEquivalent width of the CaII 8498.03{AA} line (1)0.1nmspect.line.eqWidthfloate_Ca1CENError on Ca1CEN0.1nmstat.errorfloatCa2CENEquivalent width of the CaII 8542.09{AA} line (1)0.1nmspect.line.eqWidthfloate_Ca2CENError on Ca2CEN0.1nmstat.errorfloatCa3CENEquivalent width of the CaII 8662.14{AA} line (1)0.1nmspect.line.eqWidthfloate_Ca3CENError on Ca3CEN0.1nmstat.errorfloatMgIEquivalent width of the MgI 8806.76{AA} line (1)0.1nmspect.line.eqWidthfloate_MgIError on MgI0.1nmstat.errorfloatPa1Equivalent width of the Paschen 8467.3{AA} line (1)0.1nmspect.line.eqWidthfloate_Pa1Error on Pa10.1nmstat.errorfloatPa2Equivalent width of the Paschen 8598.4{AA} line (1)0.1nmspect.line.eqWidthfloate_Pa2Error on Pa20.1nmstat.errorfloatPa3Equivalent width of the Paschen 8750.5{AA} line (1)0.1nmspect.line.eqWidthfloate_Pa3Error on Pa30.1nmstat.errorfloatCa1MEGEquivalent width of the CaII 8498.03{AA} line using the new windows defined in this paper (2)0.1nmspect.line.eqWidthfloate_Ca1MEGError on Ca1MEG0.1nmstat.errorfloatCa2MEGEquivalent width of the CaII 8542.09{AA} line using the new windows defined in this paper (2)0.1nmspect.line.eqWidthfloate_Ca2MEGError on Ca2MEG0.1nmstat.errorfloatCa3MEGEquivalent width of the CaII 8662.14{AA} line using the new windows defined in this paper (2)0.1nmspect.line.eqWidthfloate_Ca3MEGError on Ca3MEG0.1nmstat.errorfloatsTiOsTiO colour as defined by Cenarro et al. (2009MNRAS.396.1895C, Cat. J/MNRAS/396/1895)0.1nmspect.indexfloat