APOD: The Red Spider Planetary Nebula (2012 Oct 29)

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APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by APOD Robot » Mon Oct 29, 2012 4:07 am

Image The Red Spider Planetary Nebula

Explanation: Oh what a tangled web a planetary nebula can weave. The Red Spider Planetary Nebula shows the complex structure that can result when a normal star ejects its outer gases and becomes a white dwarf star. Officially tagged NGC 6537, this two-lobed symmetric planetary nebula houses one of the hottest white dwarfs ever observed, probably as part of a binary star system. Internal winds emanating from the central stars, visible in the center, have been measured in excess of 1000 kilometers per second. These winds expand the nebula, flow along the nebula's walls, and cause waves of hot gas and dust to collide. Atoms caught in these colliding shocks radiate light shown in the above representative-color picture by the Hubble Space Telescope. The Red Spider Nebula lies toward the constellation of the Archer (Sagittarius). Its distance is not well known but has been estimated by some to be about 4,000 light-years.

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by Boomer12k » Mon Oct 29, 2012 4:55 am

Reminds me of the "X red Square nebula"...

and the larger image reminds me of the "Running Man Nebula"...

Why is there a dark patch in the center...is that a relative void or something???

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Ann
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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by Ann » Mon Oct 29, 2012 7:06 am

If the central star of this nebula is one of the hottest known, then it is interesting that the nebula is so red. I would have expected more blue-green OIII emission in the presence of such a very hot star.

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by tannaberton » Mon Oct 29, 2012 9:03 am

You are looking at an hourglass figure at an angle. These things always do that.

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by biddie67 » Mon Oct 29, 2012 11:56 am

Awesome but so frustrating! I'd love to be able to rotate a view of this nebula in 3-D so the complete shape could be seen.

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by royalpalms6@msn.com » Mon Oct 29, 2012 12:12 pm

What is a 1000 meters a second mean in laimans term. ( = to ? miles an hour).

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by rstevenson » Mon Oct 29, 2012 12:53 pm

royalpalms6@msn.com wrote:What is a 1000 meters a second mean in laimans term. ( = to ? miles an hour).
Your browser probably has a small search field in the top area, with a drop-down for selecting which search engine to use. Select Google. (Others will also work, I'm sure, but I used Google.) Enter this into that search field (or in Google's home page search field if you wish)...

"convert 1000 meters a second to mph"

The answer is in the search results: 2236.94 mph.

You can use the same technique to calculate any reasonable -- and some unreasonable -- conversions.

Rob

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by neufer » Mon Oct 29, 2012 1:05 pm

rstevenson wrote:
royalpalms6@msn.com wrote:
What is a 1000 meters a second mean in laimans term. ( = to ? miles an hour).
Your browser probably has a small search field in the top area, with a drop-down for selecting which search engine to use. Select Google. (Others will also work, I'm sure, but I used Google.) Enter this into that search field (or in Google's home page search field if you wish)...

"convert 1000 meters a second to mph"

The answer is in the search results: 2236.94 mph.
And don't forget we are talking 1000 kilometers per second here.
Art Neuendorffer

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by neufer » Mon Oct 29, 2012 1:29 pm

Ann wrote:
If the central star of this nebula is one of the hottest known, then it is interesting that the nebula is so red. I would have expected more blue-green OIII emission in the presence of such a very hot star.
Most of the oxygen is probably much more highly ionized than just doubly ionized .

And you are assuming that any doubly ionized oxygen there would last for a long enough period of time for a forbidden blue-green OIII photon to be emitted before being knocked about by an ultraviolet photon from the white dwarf.

Most of the hydrogen is fully ionized but an isolated proton & electron at least have the time to connect up and rapidly radiate non-forbidden Lyman & Balmer photons before an ultraviolet photon from the white dwarf comes along to re-ionize it.
Art Neuendorffer

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by owlice » Mon Oct 29, 2012 10:56 pm

Oh, I should have mentioned this earlier; my apologies. This APOD is mirrored here as well as on the other APOD mirrors.

Goddard's servers were shut down earlier today as a precaution against a power outage due to Hurricane Sandy.
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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by 500pesos » Fri Nov 23, 2012 2:20 pm

emanating from the central stars, visible in the center
I don't see any stars. Only a weird whiteish thing with a black centre.

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Re: APOD: The Red Spider Planetary Nebula (2012 Oct 29)

Post by neufer » Fri Nov 23, 2012 2:32 pm

500pesos wrote:
emanating from the central stars, visible in the center
I don't see any stars. Only a weird whiteish thing with a black centre.
http://pintester.com/2012/08/honey-and- ... d-removal/

http://asterisk.apod.com/viewtopic.php?f=23&t=30183
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