The document is a figure showing the initial mass function (IMF) of stars in the solar neighborhood. It plots the number of stars per logarithmic mass interval versus stellar mass. It shows that: 1) The IMF increases with decreasing stellar mass, following a power law distribution. 2) It peaks at around 0.5 solar masses and declines towards both lower and higher masses. 3) The IMF can be approximated by a series of power laws with different slopes in different mass regimes.

23. !
!

26. 3
3

27. 2
Γ=
-1
.3
5
1
-2
ξ(log M) stars log -1M pc -2
0
Γ=-
2.3
-1
Γ=
-1
.3
5
-2
.1 .2 .3 .4 .6 .8 1 2 4 6 8 10 20 40 60 80
-1 0 1 2
Log M (M O)
Figure 1: Field star IMF in the solar neighborhood. Plotted are star numbers pe

28. 100 2.7×10 6
50 5.9×10 6
10 2.6×10 7
5 1.0×10 8
2 1.3×109
1 1.0×1010
0.7 4.9×1010
0.5 1.7×1011