NGC 3199 (APOD 22 May 2008)

[Axel]

"But measurements have shown the [Wolf-Rayet] star is not really moving directly toward the bright edge." Wouldn't it be reasonable to assume that the star was moving away from the direction in which it had ejected the most material, as a simple consequence of action-reaction?

[Sputnick]

"But measurements have shown the [Wolf-Rayet] star is not really moving directly toward the bright edge." Wouldn't it be reasonable to assume that the star was moving away from the direction in which it had ejected the most material, as a simple consequence of action-reaction?

Flowing winds .. flowing shapes .. I have no idea of the answer to the above question .. however, during a WHMIS session this morning I was reminded that flowing liquids generate static electricity (dangerous if the fluid is explosive .. therefore steel containers must be grounded) - also therefore, supposing fluid dynamics possibly applies to flows of Dark Matter/Dark Energy, that could possibly maybe generate the electricity which Ralph Juergens theorizes shapes this universe, you know the universe we live in, possibly not the other universes because they might have different mechanisms like little wind up springs.

[Arramon]

I was just thinking that the shape of the expanding shell looks like its being affected by the IGM as that specific star is on its course around the center of the galaxy. but then I can't tell which way is up, and where the heck is the center of the galaxy in relation to the star in this image causing the shell itself. And where actually is the star in that image causing all this?

[Case]

And where actually is the star in that image causing all this?

WR 18 (number 18 in the catalogue of galactic Wolf-Rayet stars) a.k.a. HD 89358 is at the heart of NGC 3199.

[iamlucky13]

This isn't material ejected from the star. It's interstellar material being pushed outward by the radiation pressure and stellar wind. This occurs at the heliopause. In the direction of motion, the build-up is usually greatest, creating a bow shock, but that is not the case here, apparently because the intersteller medium is more sparse in the direction of motion.

Also, material tends to be ejected from stars relatively symmetrically.

Sputnick, flowing liquid or gas only causes an electric charge if the gas itself has a charge, ie, it's carrying an excess of electrons or protons away from the source. One of the major holes in the electric universe theory is that the universe appears to be electrical neutral across large distances. Because the electric-magnetic force is so strong compared to gravity, charge imbalance has a habit of sorting itself out fairly readily. Lightning is the perfect example.

[Axel]

This isn't material ejected from the star. It's interstellar material being pushed outward by the radiation pressure and stellar wind. This occurs at the heliopause. In the direction of motion, the build-up is usually greatest, creating a bow shock, but that is not the case here, apparently because the intersteller medium is more sparse in the direction of motion.

Also, material tends to be ejected from stars relatively symmetrically.

Right, thanks. Since it's extremely unlikely that radiation pressure or stellar wind would be asymmetrical, one assumes it is evenly distributed and that the uneven shape of the formations around the star has another cause.

I can't imagine how radiation pressure could ever be asymmetrical, but a one-time ejection might be; hence my original question.