Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...546l..65b&link_type=abstract
The Astrophysical Journal, Volume 546, Issue 1, pp. L65-L68.
Astronomy and Astrophysics
Astronomy
33
Sun: Abundances, Sun: Atmosphere, Sun: Photosphere, Sun: Rotation, Sun: Uv Radiation
Scientific paper
The inability of theoretical model fluxes to fit the observed solar flux in the UV, the ``missing UV opacity problem,'' results in erroneous abundances derived from UV lines. For example, S. Balachandran and R. A. Bell recently argued that the solar beryllium abundance, derived from Be II lines at 3130 Å, was not depleted but rather equal to the meteoritic value with critical implications on mixing and angular momentum transport models. In this Letter we have incorporated recent Iron Project calculations of the Fe I bound-free opacity into our calculations of the continuous opacity. By combining this with observed line blocking, we compare the predicted fluxes to the observed solar flux in the 2000-4000 Å region. We find that a reasonable fit to the observed flux between 3000 and 4000 Å is obtained with twice the Fe I bound-free value recently derived by M. A. Bautista. The importance of this and other metal bound-free opacities is discussed.
Balachandran Suchitra C.
Bautista Manuel
Bell Roger A.
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