On the accuracy of CO line positions for high resolution IR stellar spectroscopy

Details On the accuracy of CO line positions for high resolution IR stellar spectroscopy On the accuracy of CO line positions for high resolution IR stellar spectroscopy

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..355s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 355-359.

Astronomy and Astrophysics

Astrophysics

10

Carbon Monoxide, Infrared Spectroscopy, Line Spectra, Molecular Spectroscopy, Stellar Atmospheres, Stellar Spectrophotometry, Molecular Spectra, Photosphere, Solar Spectra

Scientific paper

The paper demonstrates the high accuracy of line positions derived from improved sets of Dunham coefficients for the four more abundant isotopic species of carbon monoxide - (C-12)(O-16), (C-13)(O-16), (C-12)(O-18), and (C-12)(O-17) - which are present in the sun and in cool stellar atmospheres. These new spectroscopic constants make it possible to predict very accurate positions of CO lines at any J-values, especially at very high rotational excitation (up to J around 135). Earlier proposed identifications of CO lines at large J-values are checked, and some incorrect identifications in sunspot spectra are found. The present accurate line positions are also compared with predictions from other available sets of molecular constants. It is concluded that the present improved sets of molecular constants are the most appropriate to all problems of high-resolution stellar and solar spectroscopy at any J- and v-values, particularly for synthetic spectra of cool stars.

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