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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.
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.
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.
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.
SpectroWeb has been developed to provide users with a means to directly assess the quality of spectral line identifications by comparing high-quality observed spectra of bright stars with state-of-the-art computed spectra through an interactive on-line application.
Absorption and Emission Lines in Real Stars. For most elements, there is a certain temperature at which their emission and absorption lines are strongest. The lines you see in a star's spectrum act like thermometers. Some compounds, like titanium oxide, only appear in the spectra of very cool stars.
System Summary. Arcturus, or Alpha Boötis, is located about 36.7 light-years from Sol. It is the brightest star (14:15:39.7+19:10:56.7, ICRS 2000.0) of Constellation Boötes, the Herdsman or Bear Driver, forming his left foot.
