APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 16)

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APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 16)

Post by APOD Robot » Tue Aug 16, 2011 4:07 am

Image Shapley 1: An Annular Planetary Nebula

Explanation: What happens when a star runs out of nuclear fuel? For stars about the mass of our Sun, the center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure. Although some of these nebulas appear like planets on the sky (hence their name), they actually surround stars far outside our Solar System.

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by neufer » Tue Aug 16, 2011 4:18 am

Image
APOD Robot wrote:Image Shapley 1: An Annular Planetary Nebula

Explanation: What happens when a star runs out of nuclear fuel? For stars about the mass of our Sun, the center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure. Although some of these nebulas appear like planets on the sky (hence their name), they actually surround stars far outside our Solar System.
Art Neuendorffer

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by bystander » Tue Aug 16, 2011 4:26 am

Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by Beyond » Tue Aug 16, 2011 4:34 am

Jumpin' Jupiter!! A relative of HAL.
To find the Truth, you must go Beyond.

K1NS

Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by K1NS » Tue Aug 16, 2011 9:58 am

Why is this structure described as "annular"? Isn't it better described as a "bubble"? After all, space (and this object) is 3-dimensional.

Georges'assistant

Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by Georges'assistant » Tue Aug 16, 2011 10:14 am

Why is the center open ?
All these planetary nebulas seems like shorts cylinders with the axis orieted to us.
Are they really cylindres with the open side looking to us?
Or are they spheres that look thin in the center and with more depth in the peripheral circle ?
Thanks.

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by nstahl » Tue Aug 16, 2011 12:27 pm

Georges'assistant wrote:Why is the center open ?
All these planetary nebulas seems like shorts cylinders with the axis orieted to us.
Are they really cylindres with the open side looking to us?
Or are they spheres that look thin in the center and with more depth in the peripheral circle ?
Thanks.
Well, according to bystander's link above we're looking through a donut. And don't ask me how the cloud got into the shape of a donut but clearly magnetic fields can do some strange seeming things.

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by orin stepanek » Tue Aug 16, 2011 1:15 pm

Kind of like looking down a barrel. The opening is pointed right toward us! 8-)
Orin

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magicman

Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by magicman » Tue Aug 16, 2011 1:25 pm

Is the matter expelled at right angles to the axis of rotation of the old star? or magnetic axis ? clearly we are all wanting to know, and presumably there are all different orientations of these some appearing at right angle to our line of sight and the ones like this are purely coincidental

magicman

Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by magicman » Tue Aug 16, 2011 1:29 pm

viewed sideways on would it look like a barrel () or a diabolo ><

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by orin stepanek » Tue Aug 16, 2011 1:43 pm

Orin

Smile today; tomorrow's another day!

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by neufer » Tue Aug 16, 2011 2:39 pm

orin stepanek wrote:
Kind of like looking down a barrel. The opening is pointed right toward us! 8-)
  • But aren't we are pointing the barrel of a telescope at Shapley 1 :?:
    Click to play embedded YouTube video.
Art Neuendorffer

Dick Stacy

Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by Dick Stacy » Tue Aug 16, 2011 5:08 pm

If the parent star was spherical, why isn't the nebula ?

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by nstahl » Tue Aug 16, 2011 5:25 pm

Dick Stacy wrote:If the parent star was spherical, why isn't the nebula ?
Non-sphericle elements include the axis of rotation of the parent star, apparently the plane the two stars orbit each other in, the magnetic poles of one or both stars and maybe more.

Wolf kotenberg

Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by Wolf kotenberg » Tue Aug 16, 2011 7:53 pm

must be supernovae remnant week at APOD. Easy chair + ice cold one + APOD = an insignificant one salutes you

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Re: APOD: Shapley 1: An Annular Planetary Nebula (2011 Aug 1

Post by alter-ego » Wed Aug 17, 2011 3:22 am

Wolf kotenberg wrote:must be supernovae remnant week at APOD. Easy chair + ice cold one + APOD = an insignificant one salutes you
room temp one not for you?
A pessimist is nothing more than an experienced optimist