in the cluster data so that the plot
for the main sequence falls on top of the Hipparcos data.
The easiest way to do this is with the Data -> Transformations menu.
Select the set that corresponds to the M67 data as both the Input
and the Output. This keeps the program from generating a new set each
time you make an adjustment. Now apply y=y-2 and the m67
data will move ``up'' 2 magnitudes. Continue shifting it until you get
a good match. Keep track of the shifts and find the difference m-M
for the cluster M67. This is the distance modulus which gives
the distance to the cluster from
 |
(1) |
is in parsecs. How far from us is M67?