Comparison of predicted and observed spectral energy distributions of A-type stars

Details Comparison of predicted and observed spectral energy distributions of A-type stars Comparison of predicted and observed spectral energy distributions of A-type stars

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..747p&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 15, 1977, p. 747-756.

Astronomy and Astrophysics

Astrophysics

12

A Stars, Early Stars, Spectral Energy Distribution, Spectrophotometry, Stellar Atmospheres, Ultraviolet Spectra, Astronomical Models, Balmer Series, Continuous Spectra, Line Spectra, Oao 2, Radiant Flux Density, Stellar Mass, Stellar Models, Stellar Radiation, Stellar Temperature

Scientific paper

Emergent fluxes are determined from published low-resolution spectrum scans from 1100 to 8000 A for seven bright A-type stars which have well-determined empirical angular diameters, effective temperatures, and parallaxes. The stellar flux is compared with the emergent flux from a line-blanketed model atmosphere which has the same effective temperature. The observational accuracy is found to be sufficient to place useful constraints on model-atmosphere results. In the UV region, where observational uncertainties in the flux are + or - 10%-20%, the agreement is generally acceptable; in the ground-based region, where the observed fluxes should be about 10 times more accurate, significant discrepancies exist in absolute fluxes and colors. Computed line wings of H-gamma for Alpha CMa and Alpha Lyr are too bright near line center. These results are briefly discussed in terms of the model-atmosphere structure.

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