AAS 205th Meeting, 9-13 January 2005
Session 52 Stellar Atmospheres, Abundances and Opacities
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[52.05] The Spectrum of Arcturus from the Infrared through the Ultraviolet

K. H. Hinkle, L. Wallace (NOAO)

The spectrum of the bright K giant Arcturus has been observed at high resolution over nearly a factor of 50 in wavelength. A compressed view of the spectrum is presented on the poster. The 1000 to 3100 Å region was observed with STIS on HST. The 3100 to 9000 Å region was observed by the Kitt Peak coude feed telescope. The 0.9 to 5 \mum region was observed with a Fourier transform spectrometer at the KPNO 4 m telescope. The spectrum changes dramatically from atomic and molecular emission lines in the ultraviolet to dense absorption by atomic lines in the optical to dominance by diatomic molecular bands in the infrared. The conversion of the spectrum from absorption to emission due to the changing optical depth from the infrared and optical to the ultraviolet is particularly impressive. The spectra displayed are high resolution observations plotted on a compressed scale so that individual spectral lines are shown as sharp unresolved lines. The major spectral features are identified. Figures at a scale so that the lines are resolved are available in a series of three atlases by the authors and published by ASP.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.