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Aims.We investigate the infrared spectrum of Arcturus to clarify the nature of the cool component of its atmosphere, referred to as the CO-mosphere, and its relationship to the warm molecularenvelope or the MOLsphere in cooler M (super)giant stars.
A difficulty in the spectrum of Arcturus was highlighted by the detailed line-by-line analysis, which exhibited excess absorption in the lines of (Figs. 3 and 4). The specific lines that show excess absorption originate in levels of relatively low excitation potentials but as high as 1 eV or higher (Fig. 9). This fact implies that the excess ...
Spectrum of Arcturus captured using DSLR with spectroscopic filter. The spectrum contains moderate absorption lines from sodium and neutral metals, together with very weak hydrogen. This is consistent with a an orange K-class star.
This graph shows the strengths of absorption lines of different chemical species (atoms, ions, molecules) as we move from hot (left) to cool (right) stars. The sequence of spectral types is also shown.
As the brightest K-type giant in the sky, it has been the subject of multiple atlases with coverage from the ultraviolet to infrared. [26][27] The spectrum shows a dramatic transition from emission lines in the ultraviolet to atomic absorption lines in the visible range and molecular absorption lines in the infrared.
The spectrum of the K2 giant star Arcturus is investigated at very high dispersion in the region λλ 5000–7025 Å from coudé spectrograms secured at the 100-inch Mount Wilson telescope.
The normalised spectra of the telluric standard taken at low and high air-mass values were com-bined with different weights to match the depth of the telluric lines in the Arcturus spectrum. Figures A.1, A.2, A.3, and A.4 show the rest-frame normalised spectra corrected for telluric absorption.
