Abstract
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 Å. 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.
Keywords
StarsPhysicsAstrophysicsStellar atmosphereFlux (metallurgy)OpacityWavelengthUltravioletSpectral lineAtmosphere (unit)AstronomyOpticsMeteorologyMaterials science
Affiliated Institutions
Related Publications
Chemical Abundances from Inversions of Stellar Spectra: Analysis of Solar‐Type Stars with Homogeneous and Static Model Atmospheres
Spectra of late-type stars are usually analyzed with static model atmospheres in local thermodynamic equilibrium (LTE) and a homogeneous plane-parallel or spherically symmetric ...
A grid of MARCS model atmospheres for late-type stars
Context. In analyses of stellar spectra and colours, and for the analysis of integrated light from galaxies, a homogeneous grid of model atmospheres of late-type stars and corre...
Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry
We present a new calibration of optical (UBV, Stromgren, uvby-beta, and Geneva) and near IR (Johnson RIJHK and 2MASS) photometry for B and early A stars derived from Kurucz (199...
MARCS model atmospheres
In this review presented at the Symposium A stellar journey in Uppsala, June 2008, I give my account of the historical development of the MARCS code from the first version publi...
New Light on Stellar Abundance Analyses: Departures from LTE and Homogeneity
▪ Abstract The information on the chemical compositions of stars encoded in their spectra plays a central role in contemporary astrophysics. Stellar element abundances are, howe...
Publication Info
- Year
- 2008
- Type
- article
- Volume
- T133
- Pages
- 014011-014011
- Citations
- 21
- Access
- Closed
External Links
Social Impact
Altmetric
PlumX Metrics
Social media, news, blog, policy document mentions
Citation Metrics
21
OpenAlex
Cite This
B. Edvardsson
(2008).
Observed versus predicted stellar flux distributions of solar-type stars.
Physica Scripta
, T133
, 014011-014011.
https://doi.org/10.1088/0031-8949/2008/t133/014011
Identifiers
- DOI
- 10.1088/0031-8949/2008/t133/014011