Neutron Stars vs. Black holes

[bato]

Hey I have read that both neutron stars and black holes are formed by super nova's. What determines if the reminants of a star will become a neutron star or black hole? Can anyone give me any links to read up on this?<br /><br />ps im new so i may be full of it!!

 

[mrmux]

Black holes would win in a fair fight, but a neutron star could just orbit around it until the black hole evaporates.<br /><br />Generally speaking, bigger stars end up as black holes. And great big nebulae, of course. Depending what the star is made of, the limit is about 1.2-1.6 times the mass of the sun. (ie. Our sun won't.) <br /><br />Do a Google search for 'Chandresekhar' and 'black holes'.<br /><br />Edit: Oops. The Chandresekhar limit is to do with stars exploding (or not, if too small). Doesn't necessarily mean they'll leave a black hole. Apologies.

 

[contracommando]

<i> “What determines if the reminants of a star will become a neutron star or black hole? </i><br /><br />The mass of the object (in nature). But artificially, a black hole could be created by compressing a less massive object into a much more compact area. <br /><br /> <br /><br />

 

[Saiph]

Star mass is the primary determination. Stars larger than 10 solar masses (our star is one solar mass, by definition) will turn into neutron stars. Stars larger than ....shoot... 30? Solar masses will turn into black holes.<br /><br />The limit isn't a really hard one, as variations in the supernovae can shed more (or less) mass from the core, and it is the final core mass that determines the fate. If a very large star sheds most of it's mass, it may drop it below the maximum threshold for a neutron star (3.5 solar masses...though all observed neutron stars are rarely larger than 2.5 solar masses, we don't know why).<br /><br />But, if the final core mass is less than 1.4 solar masses, it's a white dwarf. Less than 3.5, it's a neutron star. Greater than 3.5, it's a black hole. if the mass of the white dwarf, or neutron star increases (say by capturing material from a companion star) they can be upgraded to black holes. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>

 

[lampblack]

The topic has a sort of "who would win -- Super Man or Bat Man?" feel to it.<br /><br />Gotta love black holes for their overall fierce "I'll snatch you to oblivion" feel. But lordy -- you'll coak from the emissions before you get anywhere near a neutron star. (Of course, that's true of black holes, too. So I guess Super Man wins.)<br /> <div class="Discussion_UserSignature"> <font color="#0000ff"><strong>Just tell the truth and let the chips fall...</strong></font> </div>

 

[jatslo]

<font face="”verdana”">Black Hole (Quasar) and Neutron? Is there a chart that I can see that differentiates masses by terminological referencing somewhere?</font>

 

[Saiph]

Once a black hole, always a black hole.<br /><br />A neutron star can shift up to a white dwarf, I think, if something removes the mass.<br /><br />And the really heavy helium stars (very bizzare) are thought to be white dwarfs that have re-expanded after something strips matter off of them.<br /><br />BTW, a stars population is unrelatted to size, it's a measure of metallicity. Though pop III stars, with no metals, work slightly differently and could obtain large sizes.<br /><br />Now, if you're saying that extrememly large stars can shed enough mass to turn into something smaller (like something that is large enough to turn into a BH sheds mass to turn into a neutron star). Then you're correct. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>