![]() The combined effect of these changes results in broader absorption lines. When the energy state decreases, the absorption line becomes longer in wavelength (less energy). When the energy state of an orbit increases, the absorption line becomes shorter in wavelength (more energy). These collisions result in electrostatic interaction between orbits of different atoms, leading to changes in the energy level of affect orbits. In higher density stars, the increased gas pressure produces more rapid collision between atoms. Width of absorption spectral lines also reveal information about the density of stars.ĭensity and pressure, at the surface of a star can also broaden spectral lines, but the intensity varies across the line in different way from the effect of rotation. The combined effect of these three phenomena results in broadened absorption lines in the stellar spectra.
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