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An absorption spectrum is the combination of an emission spectrum on top of a continuous spectrum. Chemical Composition of a Star. Stellar spectral lines are caused by the interactions between photons and the atoms present in gaseous layers of stars.
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.
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.
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.
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.
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.
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
