What Would Happen if Mass Were Continually Added to a 2 Msun Neutron Star
#1 
Posted 22 March 2007 - 01:52 AM
Hi all wondering if anyone had some educated opinions about what happens to a neutron star when mass is added (i.e. from a companion star losing mass to it). Does the neutron star have a limit (like a Chandrasekhar limit for white dwarfs) above which it explodes or becomes a black hole?
#2
Posted 22 March 2007 - 07:43 AM
From what I've been hearing, it is the slow build up of material followed by a large collapse and explosion of this material that's one of the main types of Nova's.
#3
Posted 22 March 2007 - 10:46 AM
Hi all wondering if anyone had some educated opinions about what happens to a neutron star when mass is added (i.e. from a companion star losing mass to it). Does the neutron star have a limit (like a Chandrasekhar limit for white dwarfs) above which it explodes or becomes a black hole?
See about 3/5 down this webpage.
#4
Posted 23 March 2007 - 10:08 PM
Thanks...tons of info there!
#5
Posted 24 March 2007 - 07:05 AM
So far I thought, sometime becomes the neutron to a black hole if mass is added evermore.
here I read that the added mass every time is hurled away by the jets,
very amazing!
If the companion to the neutron star has a mass more than about ten times our Sun's mass, the companion naturally produces a stellar wind, and some of that wind falls on the neutron star. The neutron stars in these systems have strong magnetic fields, around 10^12 Gauss (similar to typical isolated pulsars). At field strengths this high, almost all the accreting gas is forced to flow along field lines to the magnetic poles
staunende Grüße von Iblis
#6
Posted 24 March 2007 - 10:59 AM
As a neutron star gains mass, the stars gavity field gets stronger and compresses the star into a smaller volume. In simple terms, the squeezeplay upon the neutrons gets tighter as the neutrons repel each other. As long as the star does not acquire any more mass, this repulsive force will support the star indefinetly regardless of it's temperature. A newly formed neutron star will have a temperature of billions of degrees, but that is not what supports the star against collapsing inwards upon itself. Just like electron degeneracy, neutron degeneracy is finite. At some point, it could no longer support a neutron star against it's own weight. That limit is somewhere above three times the Sun's mass, and when a nuetron star exceeds it, it immediately collapses into a black hole in a fraction of a second. There's a number of binary pulsars out there where the neutron stars are spiraling in towards each other. If their combined mass exceeds the limit of neutron degeneracy's ability to support both of them, a powerful burst of gamma rays will be the birthpang of a newly formed black hole. Gamma ray bursts also announce the collapse of a rapidly rotating massive star's core directly into a black hole. Also, there has been double stars identified where one star is a neutron star, the other a normal hydrogen fusing star. A stream of gas flows from the normal star to the neutron star causing explosions on it's surface that have been seen by X-ray telescopes much like an ordinary nova. One such X-ray binary is AM Herculis, another is SS-433 in Aquila. In both cases, the neutron star is a long dead star that's enjoying a temporary ressurection.
Taras
#7
Posted 28 March 2007 - 10:13 PM
The adding of mass to a neutron star from a companion results in an old situation.
As the mass of the NS increases, it becomes smaller and smaller in diameter, as at larger masses the nuclei pack together ever more tightly.
Eventually it passes the threshold where it nuclear forces will not hold it up any longer and it will collapse in on itself, forming a black hole.
While you are happilly piling matter up on the NS, it will undergo sporadic bursts of X-Rays as the matter infalls to the surface of the NS, forming "hot spots" on the surface, usually at one or both of the magnetic poles.
I can't remmeber what the largest possible size is, for a white dwarf it is around 1.4 solar masses and for a NS it is around 3 or so.
Can we say BOOM? :dabomb:
Source: https://www.cloudynights.com/topic/102202-what-happens-when-you-add-mass-to-a-neutron-star/
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