# Computing ratios

1. Feb 2, 2013

### oldspice1212

Hi hi hi,

So guys I'm just having a little trouble with this question..

Compute the ratio between the luminosity from part B to the mass from part A. How does that ratio compare with the Sun's ratio of luminosity to mass?

So for part A I got 1Msun and part B I got 1000Lsun

So to compute the ratio I was just wondering I divide Luminosity/ Mass and isn't it just 1000 then?

Edit: Also how do I estimate the maximum amount of time these very luminous stars can last as red giants from your answer to part C (the question above).

Last edited: Feb 2, 2013
2. Feb 2, 2013

### SammyS

Staff Emeritus
Yes, the ratio is 1000 LSun/MSun .

This is an entirely different question.

3. Feb 2, 2013

### oldspice1212

Thanks yeah I noticed that its the only information I had besides I didn't mention the H R diagram. XD sorry about that.

I got 10^7 years if anyone is interested for that question.