On equivalent widths in a penumbral spectrum (a test of the Moe-Maltby model) |
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Authors: | H. Schleicher E. H. Schröter |
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Affiliation: | 1. Universit?ts-Sternwarte, G?ttingen, W.G.
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Abstract: | From new observational material we made a curve of growth analysis of the penumbra of a large, stable sunspot. The analysis was done relative to the undisturbed photosphere and gave the following results (⊙ denotes photosphere, * denotes penumbra): $$begin{gathered} (theta ^ * - theta ^ odot )_{exe} = 0.051 pm 0.007 hfill {{xi _t ^ * } mathord{left/ {vphantom {{xi _t ^ * } {xi _t }}} right. kern-nulldelimiterspace} {xi _t }}^ odot = 1.3 pm 0.1 hfill {{P_e ^ * } mathord{left/ {vphantom {{P_e ^ * } {P_e ^ odot = 0.6 pm 0.1}}} right. kern-nulldelimiterspace} {P_e ^ odot = 0.6 pm 0.1}} hfill {{P_g ^ * } mathord{left/ {vphantom {{P_g ^ * } {P_g }}} right. kern-nulldelimiterspace} {P_g }}^ odot = 1.0 pm 0.2 hfill end{gathered} $$ The results of the analysis are in satisfactory agreement with the penumbral model as published by Kjeldseth Moe and Maltby (1969). Additionally we tested this model by computing the equivalent widths of 28 well selected lines and comparing them with our observations. |
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