Astronomy C Question Marathon

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Astronomy C Question Marathon

Post by Jim_R » August 28th, 2013, 8:11 pm

Question Marathon for Astronomy C.
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Re: Astronomy C Question Marathon

Post by alpacas » September 1st, 2013, 7:43 pm

What mass range of stars can form Mira variables?

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Re: Astronomy C Question Marathon

Post by syo_astro » September 1st, 2013, 7:54 pm

alpacas wrote:What mass range of stars can form Mira variables?
I would say solar-mass/low-mass, but do you want a more specific range?
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Re: Astronomy C Question Marathon

Post by Crazy Puny Man » September 2nd, 2013, 9:12 am

Low-mass? Doesn't it need to fuse He to become a Mira?

According to the Wikipedia page temps have to be 10^8 K in order to fuse Helium via the triple-alpha process.

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Re: Astronomy C Question Marathon

Post by syo_astro » September 2nd, 2013, 11:04 am

Crazy Puny Man wrote:Low-mass? Doesn't it need to fuse He to become a Mira?

According to the Wikipedia page temps have to be 10^8 K in order to fuse Helium via the triple-alpha process.
That's why I said solar-mass/low-mass. Like I'd admit a red dwarf probably wouldn't become a Mira, but technically I think as an example the Sun is a low-mass star (which is basically why I asked whether the person wants a more specific range...didn't want to bother getting out my notes :P). My notes say 0.6 to a few solar masses as a more exact range.
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Re: Astronomy C Question Marathon

Post by alpacas » September 2nd, 2013, 1:06 pm

I was going for 0.8 to 2 solar masses so I think those answers make sense

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Re: Astronomy C Question Marathon

Post by syo_astro » September 2nd, 2013, 1:52 pm

Good enough!

Next question, hopefully this isn't one of my...worst questions: What is the Baade-Wesselink method used to determine?
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Re: Astronomy C Question Marathon

Post by alpacas » September 2nd, 2013, 5:19 pm

Its like the change in radius for pulsating variables right

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Re: Astronomy C Question Marathon

Post by syo_astro » September 2nd, 2013, 5:40 pm

alpacas wrote:Its like the change in radius for pulsating variables right
That's the main thing. But you can use it for SNe too, I think? I believe it's also useful in calibrating standard candles. Good job, wasn't sure how many people knew of it. You go.
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Re: Astronomy C Question Marathon

Post by alpacas » September 2nd, 2013, 6:49 pm

ok, what is the r-process? What DSOs from this year's rules might eventually have (or have had) the r-process?

Also are these questions supposed to be more like concept or trivia based?

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