To see the various colors that make up starlight, astronomers can use a prism to separate the colors. Common elements like helium and calcium in the atmospheres of stars block certain colors of light, ...
Various physical mechanisms broaden the intrinsic absorption lines. The most important is that the random motions of the absorbing atoms cause “Doppler broadening.” Larger motions within the object, ...
Figure 1: Simultaneous spectral fits to the stacked XMM-Newton RGS and EPIC/PN spectra of NGC 1313 X-1. The emission lines that appear in the two ultraluminous X-ray sources NGC 1313 X-1 and NGC 5408 ...
The basic principles of AAS can be expressed as follows. Firstly, all atoms or ions can absorb light at specific, unique wavelengths. When a sample containing copper (Cu) and nickel (Ni), for example, ...
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