# Integrated Visual Magnitude

1. Apr 11, 2005

### tony873004

A certain globular cluster has a total of 10^4 stars; 100 of them have MV=0.0, and the rest have MV=+5.0. What is the integrated visual magnitude of the cluster?

Nowhere in our class notes or textbook is the term "integrated visual magnitude" defined. Googling it, I find the term used, but not defined.

If I had to guess how to do this problem, I'd just do a weighted average:

$$M_{cluster}=\frac{(100*0.0)+(9900*5.0)}{10000}$$

$$M_{cluster}=4.95$$

Which when rounded for significant figures = 5.0

2. Apr 11, 2005

### Staff: Mentor

3. Sep 19, 2010

### Yasmeen073

I was also given this question and I tried clicking the link and it doesn't work. How would I go about starting this? We too didn't learn anything about integrated visual magnitude so I have no idea what to do with this. Is there some type of formula or something?