J/AJ/140/1919ivo://CDS.VizieR/J/AJ/140/1919doi:10.26093/cds/vizier.51401919CDSEngelke C.W.Price S.D.Kraemer K.E.2017-07-06T06:26:31Z2012-08-07T15:44:43ZCDS support team

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

cds-question@unistra.frinfrared-astronomyspectroscopyspectral-energy-distributionThe absolutely calibrated infrared (IR) stellar spectra of standard stars described by Engelke et al. are being extended into the visible and will span a continuous wavelength range from ~0.35um to 35.0um. This paper, which is a continuation of the series on calibration initiated with Cohen et al., presents the foundation of this extension. We find that due to various irregularities Vega ({alpha} Lyr) is not suitable for its traditional role as the primary visible or near-infrared standard star. We therefore define a new zero-point flux that is independent of Vega and, as far as is feasible, uses measured spectral energy distributions (SEDs) and fluxes derived from photometry. The calibrated primary stars now underpinning this zero-point definition are 109 Vir in the visible and Sirius ({alpha} CMa) in the infrared. The resulting zero-point SED tests well against solar analog data presented by Rieke et al. (2008, Cat. J/AJ/135/2245) while also maintaining an unambiguous link to specific calibration stars, thus providing a pragmatic range of options for any researcher wishing to tie it to a given set of photometry.2010AJ....140.1919Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/140/1919CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/110/275 : IR spectra of standard stars (Cohen+ 1995)J/AJ/112/241 : Spectral irradiance calibration. VI. (Cohen+ 1996)J/AJ/112/2274 : Spectral irradiance calibration. VII. (Cohen+ 1996)J/AJ/132/1445 : Standard calibration stars infrared spectra (Engelke+, 2006)J/AJ/135/2245 : Absolute spectrum of the Sun & Vega for 0.2-30um (Rieke+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/140/1919https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/140/1919http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/140/1919https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/140/1919https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/140/1919http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/140/1919GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/140/1919/table4Zero point spectral energy distributionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[0.11/35] Wavelengthumem.wldoubleFluxObserved fluxW.cm**-2.um**-1phot.fluxdouble