1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Stellar lifetime methods

  1. May 24, 2012 #1
    1. The problem statement, all variables and given/known data

    I have to calculate the lifetime of a star that is 300,000 times as luminous as the sun and 24 solar masses.

    2. Relevant equations

    lifetime = k * m/l

    3. The attempt at a solution

    lifetime = 10^10 * (24/300000)
    lifetime = 800000 years


    I feel as if this is almost too easy and am wondering if I have made an error along the way. In addition, I found this equation on the internet and don't really understand how it works despite knowing (or thinking I know) how to use it. I was hoping someone could explain it to me and if I am wrong, someone could point me in the right direction.

    Many Thanks

    John
     
  2. jcsd
  3. May 24, 2012 #2

    phyzguy

    User Avatar
    Science Advisor

    1)The lifetime of the sun is about 10 billion years - this is the 10^10 in your equation.
    2) A star with 24 solar masses has 24 times as much fuel as the sun.
    3) A star 300,000 times as luminous as the sun is burning its fuel 300,000 times faster than the sun.

    This gives the equation in your post. Does this answer it?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Stellar lifetime methods
  1. Decay lifetime (Replies: 3)

  2. Battery Lifetime (Replies: 3)

Loading...