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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.
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.
A highly evolved, orange-red giant star, Arcturus is still much smaller than the red supergiant Betelgeuse, at left. (See a Digitized Sky Survey image of Arcturus from the Nearby Stars Database.) System Summary. Arcturus, or Alpha Boötis, is located about 36.7 light-years from Sol.
Capella is the sixth brightest star in the sky, the third brightest star in the Northern hemisphere (after Arcturus and Vega), and the brightest star in the constellation Auriga. Although it appears to be a single star to the naked eye, it is actually a star system of four stars in two binary pairs.
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 molecular envelope or the MOLsphere in cooler M (super)giant stars.
26 Νοε 2020 · High-resolution spectroscopy in the near-infrared (NIR) is a powerful tool for characterising the physical and chemical properties of cool-star atmospheres. The current generation of NIR echelle spectrographs enables the sampling of many spectral
ABSTRACT. A spectral atlas of the infrared spectrum of the bright K2 giant Arcturus has been completed using the 4-m Mayall telescope and FTS. The 0.9-5.3 ¡im spectrum of Arcturus was observed at high signal to noise with a resolution of 100,000. Telluric lines were removed by using telluric transmission spectra
