Abstract
Synthetic spectra are presented for the vibrational-rotational fundamental transitions (XV=1) in the ground electronic state of CO for the upper-photosphere--lower-chromosphere atmospheric model of Arcturus derived by Aryes. It is found that the CO spectrum is formed in LTE and the strongest molecular lines exhibit emission cores reflecting the chromospheric temperature rise. The CO fundamental bands offer an excellent observational probe for the presence of stellar chromospheres and a consistency check for chromospheric models derived from traditional chromospheric indicators. (AIP)
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