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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.
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.
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.
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
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.
Arcturus, also designated as α Boötis (alpha Boötis), is a variable giant star of spectral class K1 in the constellation of Boötes. Arcturus visual magnitude is -0.04, making it the third brightest star in the sky.
