Astronomy C

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Magikarpmaster629
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Re: Astronomy C

Post by Magikarpmaster629 »

1. What is an H II region?
2. What gives them their name?
3. Which of the DSOs on the list contain an H II region?
4. When we observe H II regions, what color do we see them as?
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Re: Astronomy C

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Is this dead? :(
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Re: Astronomy C

Post by Adi1008 »

Magikarpmaster629 wrote:Is this dead? :(
Not anymore
1. a region of ionized hydrogen in space that when recombined with an electron, emits light at 656nm when the electron goes from n = 3 to n = 2 (called H alpha)
2. not sure, but is it because they contain ionized hydrogen, which is called H II?
3. M42
4. red (since they emit light at 656nm which is reddish light)
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Re: Astronomy C

Post by Magikarpmaster629 »

Adi1008 wrote:
Magikarpmaster629 wrote:Is this dead? :(
Not anymore
1. a region of ionized hydrogen in space that when recombined with an electron, emits light at 656nm when the electron goes from n = 3 to n = 2 (called H alpha)
2. not sure, but is it because they contain ionized hydrogen, which is called H II?
3. M42
4. red (since they emit light at 656nm which is reddish light)
yep :)
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Re: Astronomy C

Post by Adi1008 »

Magikarpmaster629 wrote:
Adi1008 wrote:
Magikarpmaster629 wrote:Is this dead? :(
Not anymore
1. a region of ionized hydrogen in space that when recombined with an electron, emits light at 656nm when the electron goes from n = 3 to n = 2 (called H alpha)
2. not sure, but is it because they contain ionized hydrogen, which is called H II?
3. M42
4. red (since they emit light at 656nm which is reddish light)
yep :)
Do main sequence stars spin faster or slower than protostars of the same final mass? Why?
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Re: Astronomy C

Post by finagle29 »

Main sequence stars spin slower than protostars of the same final mass; protostars have a greater radius and therefore greater rotational inertia so by the conservation of angular momentum as a protostar condenses further into a main sequence star it must spin faster.
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Re: Astronomy C

Post by Magikarpmaster629 »

finagle29 wrote:
Main sequence stars spin slower than protostars of the same final mass; protostars have a greater radius and therefore greater rotational inertia so by the conservation of angular momentum as a protostar condenses further into a main sequence star it must spin faster.
Wouldn't a higher rotational inertia cause them to spin more slowly, given they are the same mass?
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Re: Astronomy C

Post by finagle29 »

Magikarpmaster629 wrote:
finagle29 wrote:
Main sequence stars spin [b][i][u]faster[/u][/i][/b] than protostars of the same final mass; protostars have a greater radius and therefore greater rotational inertia so by the conservation of angular momentum as a protostar condenses further into a main sequence star it must spin faster.
Wouldn't a higher rotational inertia cause them to spin more slowly, given they are the same mass?
You're right. I thought one think and typed the other.
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Re: Astronomy C

Post by Adi1008 »

finagle29 wrote:
Magikarpmaster629 wrote:
finagle29 wrote:
Main sequence stars spin [b][i][u]faster[/u][/i][/b] than protostars of the same final mass; protostars have a greater radius and therefore greater rotational inertia so by the conservation of angular momentum as a protostar condenses further into a main sequence star it must spin faster.
Wouldn't a higher rotational inertia cause them to spin more slowly, given they are the same mass?
You're right. I thought one think and typed the other.
Both of you are (now) right, y'all can choose who asks the next question

(sorry for the late response; I completely forgot about this)
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Re: Astronomy C

Post by Magikarpmaster629 »

I guess I'll go.

Explain the gravitational instability theory of gas giant formation, and some of its flaws.
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