Zero-age Main Sequence

Add zams_color.dat to the plot using the Data $\rightarrow$ Import menu. This curve is the absolute, rather than the apparent, magnitude for a star of zero age. The difference $m-M$ is the distance modulus, since it is related to the distance $d$ (in parsecs) by

$$m-M = 5\log d -5$$

if there is no absorption from interstellar dust.

1. Print the plot with the ZAMS data annotated to show which is which.
2. Modify the observed data to best fit the ZAMS data. The difference $m-M$ is the distance modulus. Print a plot with the best fit, and use the distance modulus to calculate the distance $d$.
3. Is there any significant reddening indicating that there may be intervening dust?
4. If the Pleiades stars are significantly older than ``zero'' age, how would you expect this to alter the color-magnitude diagram as it is observed? Is there any evidence in these data of this effect. How old are the Pleiades stars?