Prospective GW sources

Ben Owen
Ben Owen
Joined: 21 Dec 04
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You're welcome, Mark. The

Message 15116 in response to message 15115

You're welcome, Mark.

The electrons never play very much of a role in the structure of the star (density as a function of depth), although they do transport heat and other things around. At the very lowest density, you've got ordinary matter - metal, where the electrons are shared all around. As the density goes up the nuclei become closer together and become more neutron rich through "electron capture," where a proton in the nucleus eats an electron and becomes a neutron. So the electrons rapidly become less numerous - although they're basically always degenerate - and their contribution to the pressure becomes pretty small compared to that of the nuclei and the neutrons. (At some point the nuclei are too neutron-rich and the neutrons "drip" out to form a degenerate fluid in the background.)

Quote:
I have seen an animation attributed to you showing how a neutron star can oscillate like a ball of Jell-O. Can you point me to any public articles that details the model used?

Hmm ... actually, for bandwidth reasons the one in the S3 report isn't animated. The one here is, and has links to the Mathematica notebooks that made it. You can get the velocity perturbation by combining equations (1) and (2) of gr-qc/9803053. The most pedagogical review I know of is astro-ph/0101136, although a lot of the conclusions are out of date (this is a fast-moving topic).

Hope this helps,
Ben

barkster
barkster
Joined: 3 Apr 05
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Found a new article on NASA

Found a new article on NASA Swift, short gamma ray bursts, and binary systems ending with discussion of GW detection by LIGO here....

... and this animation of a black hole/neutron star collision with resulting burst.

I thought it dove-tailed in with this thread nicely.

"No, I'm not a scientist... but I did stay at a Holiday Inn Express."

tullio
tullio
Joined: 22 Jan 05
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RE: Found a new article on

Message 15118 in response to message 15117

Quote:

Found a new article on NASA Swift, short gamma ray bursts, and binary systems ending with discussion of GW detection by LIGO here....

... and this animation of a black hole/neutron star collision with resulting burst.

I thought it dove-tailed in with this thread nicely.


There is also a free access article in the News and Views section of 'Nature' on line magazine dated October 6. It mentions both LIGO and the VIRGO Italian/French interferometer searching for GW.
Tullio

Chipper Q
Chipper Q
Joined: 20 Feb 05
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Happened to run across this

Happened to run across this and couldn't resist posting it. It's an artist's impression of a giant flare from a magnetar after the cracking of its surface (Credit: NASA) See: Double Star and Cluster observe first evidence of crustal cracking

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