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Observing the Spectrum of M31
You have elected to observe the spectrum of M31, and compare the locations of
spectral lines to those of calcium as seen in a laboratory. Spectra are
especially powerful tools in astronomy, and contain much useful information
about their sources! Below is the spectrum of M31. The locations of lab spectra
of calcium K and H lines are also indicated in black. The corresponding calcium
H and K lines from M31 can be seen in absorption. Look carefully in making your
comparison. You may find it easier to click on the image, print it, and
estimate the Doppler shifted wavelengths using a ruler.
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