J/MNRAS/406/460ivo://CDS.VizieR/J/MNRAS/406/460doi:10.26093/cds/vizier.74060460CDSPitman K.M.Dijkstra C.Hofmeister A.M.Speck A.K.2024-07-12T20:14:24Z2011-01-25T13:06:09ZCDS support team

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

cds-question@unistra.frinterstellar-mediuminfrared-astronomyspectroscopyLaboratory measurements quantifying the effect of Fe substituting for Mg in olivine are needed to distinguish compositional from temperature, grain size and grain shape effects in observational data. To address this need, we study room temperature absorption spectra of a large suite of olivines evenly spaced across Mg and Fe compositions. We apply the principle that classical dispersion theory may be used to determine peak positions as well as peak widths, strengths and possibly optical function (n({lambda}) and k({lambda})) estimates from absorption spectra of thin film samples of these olivines and two additional isotropic and anisotropic minerals with varying hardness and numbers of spectral bands. For olivine, we find that this method provides good estimates of peak position and that accounting for asymmetric peak shapes in this way increases the error on full width at half-maximum and oscillator strengths. Values from classical dispersion fits better match published n and k derived from reflectivity of single crystals when the dust proxy is soft and the thickness of the sample is independently constrained. Electronic data and peak parameter trends for the laboratory olivine absorption spectra and the viability of the extracted n and k are discussed with regard to astronomy.2010MNRAS.406..460Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/406/460CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/371/1744 : Identification of nitride dust (Pitman+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/406/460https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/406/460http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/406/460https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/406/460https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/406/460http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/406/460GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/MNRAS/406/460/spectraList of IR spectraFoForsterite composition (per cent Mg content)%phys.abundintn_Fo[nsm] Natural, synthetic, or meteoritic spectrum (impurities: 1.26% CaO);meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFileName of file with absorbance spectrummeta.id;meta.filecharspPlot the corresponding spectrummeta.ref.urlcharJ/MNRAS/406/460/nbeta*Real indices of refraction (Bowen & Schairer 1935, Am. J. Sci., 29, 197), by Fo compositionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFoForsterite composition (per cent Mg content)%phys.abundintnReal index of refractionphys.refractIndexfloatJ/MNRAS/406/460/caonk*Real and imaginary indices of refraction for CaOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[1,4000] Wavenumbercm**-1em.wavenumberintLambdaWavelengthumem.wldoublenReal index of refractionphys.refractIndexdoublekImaginary index of refractionphys.refractIndexfloatJ/MNRAS/406/460/saponnk*Real and imaginary indices of refraction for saponiterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[1,4000] Wavenumbercm**-1em.wavenumberintLambdaWavelengthumem.wldoublenReal index of refractionphys.refractIndexdoublekImaginary index of refractionphys.refractIndexfloat