J/A+A/568/A9ivo://CDS.VizieR/J/A+A/568/A9doi:10.26093/cds/vizier.35680009CDSMoehler S.Modigliani A.Freudling W.Giammichele N.Gianninas A.,Gonneau A.Kausch W.Lancon A.Noll S.Rauch T.Vinther J.2015-01-17T16:42:41Z2014-08-06T14:49:19ZCDS support team

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

cds-question@unistra.frspectrophotometrystandard-starswhite-dwarf-starsWhile the near-infrared wavelength regime is becoming more and more important for astrophysics there is a marked lack of spectrophotometric standard star data that allow to flux calibrate such data. Furthermore flux calibrating medium to high resolution echelle spectroscopy data is challenging even in the optical wavelength range, because the available flux standard data are often too coarsely sampled. We will provide standard star reference data that allow users to derive response curves from 300nm to 2500nm for spectroscopic data of medium to high resolution, including those taken with echelle spectrographs. In addition we describe a method to correct for moderate telluric absorption without the need of observing telluric standard stars. As reference data for the flux standard we use theoretical spectra derived from stellar model atmospheres. We verify that they provide an appropriate description of the observed standard star spectra by checking for residuals in line cores and line overlap regions in the ratios of observed (X-shooter) spectra to model spectra. The finally selected model spectra are then corrected for remaining mismatches and photometrically calibrated using independent observations. The correction of telluric absorption is performed with the help of telluric model spectra. We provide new, finely sampled reference spectra without telluric absorption for six southern flux standard stars that allow the users to flux calibrate their data from 300nm to 2500nm, and a method to correct for telluric absorption using atmospheric models.2014A&A...568A...9Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/568/A9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/568/A9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/568/A9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/568/A9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/568/A9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/568/A9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/568/A9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/568/A9/stars (List of stars in this catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/568/A9/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/568/A9/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/568/A9/stars?GETtext/xml+votable180.050000true88.115041715.88716670.0055555555555555566/18712 23789 28026 37477 40070 42760 47957https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/568/A9?format=asciiOpticaldefaultJ/A+A/568/A9/stdModel reference spectra for flux standard starslambda[300/2500] Wavelength {lambda}nmem.wl;meta.mainfloatprimaryGD71Model reference spectrum flux for GD7110mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleLTT3218Model reference spectrum flux for LTT321810mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleGD153Model reference spectrum flux for GD15310mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleEG274Model reference spectrum flux for EG27410mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleLTT7987Model reference spectrum flux for LTT798710mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleFeige110Model reference spectrum flux for Feige11010mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleJ/A+A/568/A9/dcmodModel reference spectrum for the DC star L97-3lambda[320/2500] Wavelength {lambda}nmem.wl;meta.mainfloatprimaryL97-3Model reference spectrum flux for L97-310mW.m**-2.nm**-1meta.ref;phot.flux;meta.modelleddoubleJ/A+A/568/A9/starsList of stars in this catalogNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainTeff[8081/45250] Effective temperatureKphys.temperature.effectiveintlogg[5.8/8.2] Surface gravitylog(cm.s**-2)phys.gravityfloatSpTSpectral typesrc.spTypecharspShow the spectrummeta.ref.urlchar