The Evolution of High Mass Stars

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High-mass stars are the flashy parts of Stellar Evolution. We see the speedy and violent stellar nucleosynthesis that occurs inside their cores. These extremely rare supergiant stars live short lives and make a lot of stuff. High-mass stars evolve much more rapidly, and their endings are extraordinary. They are responsible for many of the elements that make up your body! This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
Stellar Evolution: en.wikipedia.o...
Stellar nucleosynthesis: en.wikipedia.o...
Nucleosynthesis: en.wikipedia.o...
Supergiant star: en.wikipedia.o...
Planetary Nebula: en.wikipedia.o...
Nuclear binding energy: en.wikipedia.o...
Iron Peak: en.wikipedia.o...

[@JasonKendallAstronomer]

Just as a bit of a warning. This is a remaster of a video that was done in a loud room with a big air vent and A/C unit. I cleaned it up the best I could, and I also had to do some punch-ins with some updates. They'll be different enough to be quite noticeable. Some day I'll have to do a full re-recording of this video.

[@noelstarchild]

Didn't fully realise the weakforce bosons were so prevellent and recycling everything so often and efficiently. It is a WOW lecture sir, thank you.

[@playgroundchooser]

Dammit man! It's late, and I should be sleeping; but I've got to watch this.... and you end it on a *cliffhanger!?!?* 😂 you're killing me! 😂

[@JasonKendallAstronomer]

Always do….

[@mrpocock]

Thanks. That was really interesting. I look forward to next time.

[@thetobi583]

As a human named Orion, I tend to absorb anything relating to my constellation. In my 32 years of absorbing info, I had no clue my right shoulder looked like that when fully zoomed out on it as an individual thing. It looks like it's been blowing off pieces of itself for a while.

[@weedmanwestvancouverbc9266]

Attack ships on fire off the shoulders of Orion

[@paulmicks7097]

Thank you Jason, you've kept me informed for years, keeps the old college brain cells working.

[@bryandraughn9830]

When nuclear physics intersects with astronomy it just blows my mind.
I mean, stars are big, nuclei are small and it's just this crazy situation.

[@petervisor]

Excellent! I learnt soooo much.

[@LuisMailhos]

Great video, but I'm wondering if a big enought an H bomb (or a particle accelerator) could trigger the C and N atomic sequence on our atmosphere.

[@douglaswilkinson5700]

There is a rare spectral type *O* main sequence star (O9.5V) visable to the naked eye: Zeta Ophiuchi.

[@aerobique]

wow, so good. subscribed

[@markj3118]

When Betelgeuse begins fusing elements heavier than carbon, will the increase in neutrino emissions be detectable with existing neutrino detectors? Of course, that’s assuming it happens soon.

[@weedmanwestvancouverbc9266]

That's a good question but the only neutrinos that are currently visible to new trying to observatories here are from the Sun and the ones that happened from supernova 1987a

[@johnmann6866]

Great video. Sooo... neutrinos. For Betelgeuse, would these be detectable with current observatories, and are the energies of the neutrinos released by each fusion stage different and detectable? Ta.

[@JasonKendallAstronomer]

Yes, absolutely

[@johnmann6866]

@@JasonKendallAstronomer Thanks. So when Betelgeuse (or Eta Carinae) goes pop, there should be a hail of neutrinos and presumably this will offer enormous insights into the exact mechanism of core collapse?

[@SirDeadPuppy]

great vid!

[@ventsislav1796]

Mr Kendal, is it possible that a huge protostar bigger than 250 solar masses could collapse down to a black hole directly due to the immense gravitational force?

[@JasonKendallAstronomer]

That is the idea of Population III stars, or the very first ones. With no metallicity, these stars would be H->He only at extremely high rates. I'll eventually do a video on them, too...

[@garethdean6382]

So heating via release of gravitational potential energy is what triggers fusion in the core? If the core contracted slowly enough to release that energy, would fusion not trigger, or is there a point where rising pressure alone would suffice? If the former I assume the star would simply collapse into a neutron star or black hole.

[@tradtke101]

Or, "When that astronomical object be thicc"

[@grproteus]

I love your lectures, but you need a proper microphone. The audio splicing at 18:00 was really, REALLY bad.

[@JasonKendallAstronomer]

What I need to do is re-record this whole video.

[@dmpase]

AAVSO membership is $95 per year.

[@JasonKendallAstronomer]

Thanks for the correction!