The fundamental bands of CO in Arcturus - Evidence for an inhomogeneous chromosphere

Details The fundamental bands of CO in Arcturus - Evidence for an inhomogeneous chromosphere The fundamental bands of CO in Arcturus - Evidence for an inhomogeneous chromosphere

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..970h&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Feb. 1, 1978, p. 970-978.

Astronomy and Astrophysics

Astrophysics

51

Atmospheric Composition, Carbon Monoxide, Chromosphere, Giant Stars, Stellar Atmospheres, Abundance, Atmospheric Models, Late Stars, Molecular Rotation, Molecular Spectra, Spectral Bands

Scientific paper

We compare new high-spectral-resolution observations of the fundamental vibration-rotation bands of CO in the Arcturus spectrum with synthetic spectra for a representative set of existing model atmospheres of this star. The Ayres and Linsky model of the lower chromosphere-upper photosphere does not reproduce the observed spectrum in any respect. We conclude that there is not a homogeneous chromosphere typical of that model on Arcturus. It does not appear possible to reproduce both the Ca II K line wings and the CO fundamental lines with a single-component model. Several alternative sets of synthetic spectra are able to reproduce the observed CO spectrum. We are not able at this time to decide which of these most accurately represents the true atmospheric structure of Arcturus because departures from LTE may be important in the CO line formation. If such departures occur, the layers in which the CO lines form will be hotter than those inferred from an LTE analysis.

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