Mmmm...Donut! (APOD 2008 Nov 21)

[neufer]

http://apod.nasa.gov/apod/ap081121.html

<<The "Little Dumbbell Nebula" ...is thought to be shaped more like a donut.>>

Dumbbell/Donut: http://tinyurl.com/3hpus2

[starnut]

The APOD blab says the blue-green parts of the nebula are from oxygen. That puzzles me as the nebula was due to the ejected outer layer of the star, which was mostly hydrogen. There shouldn't be any oxygen in that layer as there was not enough heat and pressure for fusion to create any. The only place where oxygen exists is in the core, where the gravity would be too strong for the oxygen to be dredged up by the convulsions that ejected the outer layer.

Gary

[harry]

G'day from the land of ozzzzzz


Close-up of M27, the Dumbbell Nebula
http://hubblesite.org/newscenter/archiv ... 6/image/a/

VLT Image of Dumbbell Nebula
http://hubblesite.org/newscenter/archiv ... 6/image/c/

WIYN Emission Line Image of Dumbbell Nebula
http://hubblesite.org/newscenter/archiv ... 6/image/b/

Zoom into Dumbbell Nebula ,,,,,,,,video
http://hubblesite.org/newscenter/archiv ... 6/video/a/


In my opinion:
The cause of the bubbles is due to the jet formation from the core incorporating the solar envelope. This jet will collect what ever is in its parth through the several layers of the solar envelope.

Surface jets have not got the power to eject matter and reform the star into a nebulae.

[bystander]

Hi, Harry. Great references, but just in case you didn't notice, the APOD is about M76, the "Little Dumbbell Nebula".

[harry]

G'day bystander

ooops, got my roads crossed.

Whats in a Nebulae anyway?

http://astro.nineplanets.org/twn/n0650.html
Little Dumbbell Nebula

M76 - The Little Dumbbell Nebula
http://www.astroimages.org/ccd/m76.html

M76 - Little Dumbbell Nebula
http://www.perezmedia.net/beltofvenus/a ... 00483.html

M76 - The Little Dumbbell Nebula
http://www.princeton.edu/~rvdb/images/NJP/m76.html

M76 Little Dumbbell Nebula in [SII], Hydrogen Alpha and [OIII] Light
http://www.narrowbandimaging.com/m76_em ... s_page.htm

M76: The Little Dumbell
http://www.noao.edu/outreach/aop/observers/m76.html

A few different Nebulae
Jim Burnell's CCD Images
http://www.jburnell.com/Nebulae.html

also

http://www.celestronimages.com/categories.php?cat_id=3

[bystander]

Whats in a Nebulae anyway?

As far as I know, ionized gas and dust. But, what is dust? Is that like the astronomers definiton of metals? Anything heavier than helium? Or is it simply unionized matter?

[astrolabe]

Hello Bystander,

As far as I know, ionized gas and dust. But, what is dust?

A question always in the back of my mind when I see images like this.

[astrolabe]

Hello All,

Oooo, oooo. How 'bout this for dust?

http://antwrp.gsfc.nasa.gov/apod/ap990509.html

Cosmological dust bunnies. Doesn't quite fill the bill. Vintage 1999. Maybe:

http://en.wikipedia.org/wiki/Interstellar_dust

[Chris Peterson]

Whats in a Nebulae anyway?

As far as I know, ionized gas and dust. But, what is dust? Is that like the astronomers definiton of metals? Anything heavier than helium? Or is it simply unionized matter?

The latter. Dust is what you get when atoms or molecules stick together (usually weakly) to form a blob of some sort, but which is not itself a single molecule. The size of dust particles has been measured in nebulas using scattering and polarization properties. Recently, some interstellar dust particles have been found in meteorites. I believe they have also been detected by particle detectors on several space probes.

[bystander]

Thank, Chris. You, too, astrolabe. Good reference.

Ah ha! Just looked at today's apod. I see where you got your reference.

[NoelC]

Go outside.

Look at the ground.

Okay, dig down a ways, past the organic stuff. Or go to the desert.

That's the interstellar dust we're talking about. We're walking on a dust ball.

-Noel

[neufer]

Whats in a Nebulae anyway?

As far as I know, ionized gas and dust. But, what is dust?
Is that like the astronomers definiton of metals? Anything heavier than helium?

Or is it simply unionized matter?

The latter.

unionized, adjective
1. being a member of or formed into a labor union [syn: organized]
2. not converted into ions [syn: nonionized]

Chris can't mean "simply nonionized matter" cause that would include H I regions:

<<An H I region is an interstellar cloud composed of neutral atomic hydrogen (H I). These regions are non-luminous, save for emission of the 21-cm (1,420 MHz) region spectral line. This line has a very low transition probability, so requires large amounts of hydrogen gas for it to be seen. At ionization fronts, where H I regions collide with expanding ionized gas (such as an H II region), the latter glows brighter than it otherwise would. The degree of ionization in an H I region is very small at around 10-4 (i.e. one particle in 10,000). Mapping H I emissions with a radio telescope is a technique used for determining the structure of spiral galaxies. It is also used to map gravitational disruptions between galaxies. When two galaxies collide, the material is pulled out in strands, allowing astronomers to determine which way the galaxies are moving.>>
http://en.wikipedia.org/wiki/H_I_region

So Chris must mean "organized matter" :

Dust is what you get when atoms or molecules stick together (usually weakly) to form a blob of some sort, but which is not itself a single molecule. The size of dust particles has been measured in nebulas using scattering and polarization properties. Recently, some interstellar dust particles have been found in meteorites. I believe they have also been detected by particle detectors on several space probes.

-----------------------------------------------------
http://en.wikipedia.org/wiki/Cosmic_dust
<<Cosmic dust is a type of dust composed of particles in space which are a few molecules to 0.1 mm in size. Cosmic dust can be further distinguished by its astronomical location; for example: intergalactic dust, interstellar dust (potentially concentrated in a nebula), interplanetary dust (such as in a circumstellar disk) and circumplanetary dust (such as in a planetary ring). In our own Solar System, interplanetary dust causes the zodiacal light. Sources include comet dust, asteroidal dust, dust from the Kuiper belt, and interstellar dust passing through our solar system.>>
-----------------------------------------------------
The Blob (1958): <<A meteorite falls in the country of a small town, bringing a jelly creature. An old farmer is attacked by the alien in his hand, and the youths Steve Andrews and his girlfriend Jane Martin take him to Dr. T. Hallen. The local doctor treats carefully the blister, and asks Steve to investigate the location where they found the old man. When Steve returns, he sees the blob killing the doctor. Steve and Jane try to warn the police and the dwellers, but nobody believe on them, while the blob engulfs many people, getting bigger and bigger.>>

Lieutenant Dave: I think you should send us the biggest transport plane you have,
and take this thing to the Arctic or somewhere and drop it where it will never thaw.

[Chris Peterson]

unionized, adjective

I kind of liked that ambiguity. Had to stare at a few seconds to convince myself what I was reading. I don't know why I've never noticed it before, except now it's clear why nonionized is the more common usage!

The Blob (1958): <<A meteorite falls in the country of a small town, bringing a jelly creature...

An especially pernicious form of cosmic dust, especially as Steve McQueen is no longer here to save the world.

[neufer]

The Blob (1958): <<A meteorite falls in the country of a small town, bringing a jelly creature...

An especially pernicious form of cosmic dust, especially as Steve McQueen is no longer here to save the world.

Nor Steven McQueen:

1) "The Blob" was originally going to be called "The Glob".
but was changed after it was discovered that "The Glob" was
already a 1952 children's book about the evolution of man
written by John O'Reilly and illustrated by Walt Kelly.

2) The Blob was created with a modified weather balloon
in the early shots, and in the later shots with colored silicone gel.

3) The popular title song used over the opening credits was credited to "The Five Blobs".
There was only one Blob, studio singer Bernie Knee, who did all the vocal tracks.

4) Steve McQueen was offered $2,500 or 10% of the profits.
He took the $2,500 because the film wasn't expected to make much.
It ended up grossing over $4 million.

[harry]

G'day from the land of ozzzzzzzzzzz

I saw the Blob when it first came out.

That was a few years ago.