The continuous UV flux of Alpha Lyrae - Non-LTE results

Details The continuous UV flux of Alpha Lyrae - Non-LTE results The continuous UV flux of Alpha Lyrae - Non-LTE results

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214l..35s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 214, May 15, 1977, p. L35-L38.

Astronomy and Astrophysics

Astrophysics

25

A Stars, Chromosphere, Solar Atmosphere, Solar Spectra, Ultraviolet Spectra, Atmospheric Models, Error Analysis, Nonequilibrium Thermodynamics, Oao 3, Radiant Flux Density, Satellite Observation, Thermodynamic Equilibrium, Ubv Spectra

Scientific paper

Non-LTE calculations for the ultraviolet C I and Si I continuous opacity show that LTE results overestimate the importance of these sources of opacity and underestimate the emergent flux in Alpha Lyr. The largest errors occur between 1100 and 1160 A, where the predicted flux in non-LTE is as much as 50 times larger than in LTE, in reasonable accord with Copernicus observations. The discrepancy between LTE models and observations has been interpreted to result from the existence of a chromosphere. Until a self-consistent non-LTE model atmosphere becomes available, such an interpretation is premature.

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