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mass stars is so much greater than the number of high mass stars, that we show the results on a log-log plot. In general, we find that we can fit the data with power laws of the form N(m) ~ m-y. The best fit values of y are shown as slopes in the figure. These figures don't have much data for stars much less massive than the Sun, but other studies indicate that the function doesn't rise as fast as it does for the mass range shown in Fig. 5.13.

We can also look at the number of stars in different luminosity ranges, or the luminosity function. We find that there are also many more low luminosity stars than high luminosity stars. However, the luminosity of each high mass star is so much greater than that for each low mass star, that most of the luminosity of our galaxy comes from a relatively small number of high mass stars.

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