I'm working on a project where the star at the centre of the planetary system is 1.23 Solar masses. What would it's properties and evolutionary track be (i.e. main sequence lifespan, length of the red giant phase), assuming a metallicity slightly but not hugely higher than the Sun?

  • 2
    $\begingroup$ If you have exact requirements you must install and run your own evolution model (e.g. MESA is open source and free to use), do a basic calculation using MESA web (astro.wisc.edu/~townsend/static.php?ref=mesa-web) or interpolate from the many stellar evolution code results that have been published. Otherwise, MS lifetime scales as $M^{-2.5}$. $\endgroup$
    – ProfRob
    Oct 17, 2021 at 17:46
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    $\begingroup$ The "Single Stellar evolution" (SSE) evolution code by Hurley is fantastically easy and fast to use, if you know how to compile a fortran code. astronomy.swin.edu.au/~jhurley/bsedload.html $\endgroup$ Oct 17, 2021 at 18:18
  • $\begingroup$ Thanks, I don't necessarily need ultra-specific requirements, just stuff like radius, rough surface temperature and so on. $\endgroup$
    – Cryoraptor
    Oct 17, 2021 at 19:37
  • $\begingroup$ Unfortunately, 1.23 solar masses with a metallicity slighty higher than the Sun is very specific. I doubt you will find an off-the-shelf model. If 1.2 solar masses and solar metallicity will do, then you should be able to easily find something. $\endgroup$
    – ProfRob
    Oct 18, 2021 at 8:47


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