Stellar Mass, Luminosity and Lifespan
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- čas přidán 24. 03. 2024
- Now we get to some real meat of astrophysics. We discuss the relationship between mass, luminosity, and lifespan of main sequence stars. It is an amazing discovery that mass is known to be tightly correlated to luminosity for Main Sequence stars. Also, the luminosity is tightly related to spectral type. So, just get the spectrum, and you know the mass! This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
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Hertzsprung-Russell diagram: en.wikipedia.org/wiki/Hertzsp...
Luminosity/Radius/Temperature Relation: en.wikipedia.org/wiki/Luminos...
Stellar Evolution: en.wikipedia.org/wiki/Stellar...
Stellar Lifetime: hyperphysics.phy-astr.gsu.edu/...
Main-Sequence Effective Temperatures from a Revised Mass-Luminosity Relation Based on Accurate Properties: arxiv.org/pdf/1501.06585.pdf
CNO Cycle: en.wikipedia.org/wiki/CNO_cycle
Proton-Proton Chain: en.wikipedia.org/wiki/Proton-... - Věda a technologie
I think the UK now uses the US Billion/Trillion. (The UK newspaper 'the Telegrapth' adopted the US system around 1970)
I remember traders still using the old way at my previous jobs.
Given that there's a 1:1 ratio for mass:radius at 1 solar mass,but more like 2:1 at10 solar masses, I assume the relationship's not linear but better approximated by a curve?
The central temperature varies significantly, it seems, in regards to lower mass stars. Is Proxima Centauri running via the exact same processes as our sun? Is that the reason for the 'leg' in the mass:luminosity relationship?
In metal-poor stars is the CNO cycle greatly impacted? Would Population III stars have a different main sequence at higher masses?
Hi, I was wondering if you know the sources for these graphs, particularly the mass-luminosity one or where that data has come from, I was just interested in using it for an assignment. Thanks so much.
They come from either the source listed in the paper that I referenced, or from Carroll and Ostlie.
Alpha centauri A seems barely different from the sun, yet this small mass difference causes it to be primarily CNO cycle??
Why is there a climate change warning by CZcams on this stellar astrophysics video?
Because I mention that as the Sun evolves, it'll get hotter. Then I state that this is not a cause for climate change on human times scales. I opened a note with YT for them to look....
@@JasonKendallAstronomerI understand.
Several of us -- all aerospace engineers & a secured lab mgr meet at a Hamburger Habit on Mondays after work to discuss astrophysics, esp. stellar. Your channel is a welcome addition to our continuing education. Thank you! (Our Northrop Grumman engineer got us in to see JWST just before it was folded up and taken to the barge. It is impressive and huge!)
Thank you for your kind words! That's impressive you got a chance to see JWST!
Is the climate disclaimer a fact or a statement?