Question

by examining the widths of the spectral lines we can find information about a stars chemical composition radius mass rotation surface temperature

Explanation:

The width of spectral lines of a star is related to its rotation. Faster - rotating stars have broader spectral lines due to the Doppler effect across different parts of the rotating surface. Chemical composition is determined by the presence of specific spectral lines, radius by luminosity and temperature relations, mass by binary - star analysis and other methods, and surface temperature by the peak wavelength of the spectrum.

Answer:

rotation