Spectral lines have a width in energy or wavelength as they are observed or studied. In the spectrum below, an absorption spectrum from a hot star is observed using the Hubble Space Telescope. 1. Discuss the broadening of spectral lines and the physical processes behind. 2. What is the temperatur of the atmosphere (where the lines are formed) derived from a lines in the observed spectrum below. 3. Are there effects that could prevent the measurements of temperature from spectral lines? 13572 1.357.8 1357.4 1.357.6 Wavelength (A)