Computer Science
Scientific paper
Aug 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970saosr.321.....l&link_type=abstract
SAO Special Report #321 (1970)
Computer Science
25
Scientific paper
New instrumentation and techniques for measuring spectral-energy distributions and line strengths were developed and then applied to obtain the necessary observations for a model-atmosphere analysis of the abundances in Merak (β UMa) relative to Sirius (α CMa). The spectrum observed for Sirius in the visual is predicted satisfactorily, but not perfectly, by the model-atmosphere calculations. The observed ultraviolet spectrum is much dimmer than the models predict, indicating that future calculations should include line blanketing as a source of ultraviolet opacity. A moderate resolution spectrometer was developed for scanning stellar continua. This instrument is now in operation on Mount Hopkins, where the spectral-energy distribution of Merak was measured with an accuracy of about 1%. High-dispersion spectrograms of Merak were obtained at the Kitt Peak National Observatory. A digitized microphotometer and associated computer programs were used to measure 1300 equivalent width with accuracies of about 10 mA. My abundance analysis of Merak relative to Sirius shows that the two stars have essentially identical chemical compositions. Both exhibit the overabundances typical of the metallic-line A stars.
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