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Observed versus predicted stellar flux distributions of solar-type stars
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Astronomy and Space Physics.
2008 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T133, 014011- p.Article in journal (Refereed) Published
Abstract [en]

I have compared the low-resolution spectrophotometric fluxes in the visible spectral region of F- and G-type MARCS 2008 model atmospheres to six spectrophotometric databases of the Sun and stars. These observational databases disagree with each other concerning the overall red/blue flux balances on the several percent scale for the same objects. There is, however, no systematic overall trend between MARCS model fluxes and these observations taken together and therefore no reason to suspect any problem with the MARCS overall spectrum balance. The results strongly suggest, however, that there are systematic errors in the ultraviolet and blue opacities used in the construction of the model atmospheres. These errors appear in wavelength regions with widths of some 50-150 angstrom. Similar uncertainties are found also in other independent libraries of synthetic model atmosphere fluxes. I also highlight a number of unidentified spectral features with unusual shapes in spectra of the Sun and solar-type stars.

Place, publisher, year, edition, pages
2008. Vol. T133, 014011- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-149146DOI: 10.1088/0031-8949/2008/T133/014011ISI: 000262583700013OAI: oai:DiVA.org:uu-149146DiVA: diva2:404077
Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2011-03-15Bibliographically approved

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