Solve Your HR Diagram Problem with Expert Help - Tuugii

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SUMMARY

The discussion focuses on solving HR diagram problems related to stellar evolution, specifically addressing the significance of a star with a mass of 1M and luminosity of 20L. Key equations for calculating main sequence lifetimes are provided, including the formula: Star main sequence lifetime = [star's mass / star's luminosity] × 1010 years. Additional resources and links to detailed notes on stellar lifetimes and main sequence stars are shared for further exploration.

PREREQUISITES
  • Understanding of stellar evolution concepts
  • Familiarity with HR diagrams
  • Basic knowledge of astrophysics equations
  • Ability to interpret luminosity and mass in stellar contexts
NEXT STEPS
  • Research the equation for stellar evolution in detail
  • Explore the significance of luminosity in main sequence stars
  • Study the provided resources on main sequence lifetimes
  • Learn about the variations in stellar lifetimes based on mass
USEFUL FOR

Astronomy students, astrophysicists, educators in stellar evolution, and anyone interested in understanding the dynamics of HR diagrams and stellar lifetimes.

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how to solve it?

thanks,
Tuugii
 
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How about trying to write an equation for stellar evolution. One has a 1M (solar mass if I read the symbol correctly) leaving the main sequence at 20 L. What's the significance of that?

We ask students to provide some work and effort when asking for assistance.
 
Last edited:
thanks a lot. But what is the equation of evolution? if you can provide me a little more info on that, I think I can make it further.

Tuugii
 
Here are some useful notes on stellar lifetimes. I haven't gone through the details, but there appears to be some variation. It would be worthwhile to do a comparison.

THE MAIN SEQUENCE
http://www.astronomy.ohio-state.edu/~ryden/ast162_4/notes14.html
http://ftp.astronomy.ohio-state.edu/~pogge/Ast162/Unit2/mainseq.html

http://www.astronomynotes.com/evolutn/s8.htm

Star main sequence lifetime = [star's mass / star's luminosity] × 1010 years.
Star main sequence lifetime = 1010 / (star's mass)(p - 1), where p = 3 for stars more massive than 30 solar masses and p = 4 for stars less massive than 10 solar masses.


http://astronomy.swin.edu.au/cosmos/M/Main+Sequence+Lifetime (this page seems pretty good)

http://csep10.phys.utk.edu/astr162/lect/mainseq/mainseq.html

http://zebu.uoregon.edu/~imamura/208/feb6/life.html

Notes on Stars
http://www.astro.uiuc.edu/~kaler/sow/class.html
 
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