Solve Your HR Diagram Problem with Expert Help - Tuugii

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Discussion Overview

The discussion revolves around solving a problem related to the Hertzsprung-Russell (HR) diagram, specifically focusing on stellar evolution and the significance of stellar mass and luminosity in this context. Participants explore equations and concepts related to stellar lifetimes and evolutionary stages.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • Tuugii seeks assistance in solving a problem related to the HR diagram.
  • One participant suggests writing an equation for stellar evolution, mentioning a star with a mass of 1 solar mass leaving the main sequence at 20 luminosities and questions its significance.
  • Tuugii asks for clarification on the equation of evolution and requests more information to progress further.
  • A participant provides notes on stellar lifetimes, including equations for calculating main sequence lifetime based on mass and luminosity, and shares several external resources for further reading.

Areas of Agreement / Disagreement

The discussion does not appear to have a consensus, as participants are exploring different aspects of stellar evolution and equations without resolving the initial problem posed by Tuugii.

Contextual Notes

Participants reference various equations and resources, but there is no agreement on a specific approach to solving the HR diagram problem. The discussion includes assumptions about stellar mass and luminosity that may not be universally accepted.

Tuugii
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how to solve it?

thanks,
Tuugii
 
Last edited:
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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.
 
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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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