Eta Carinae Fatal pulse (APOD 26 Mar 2006)
-
- G'day G'day G'day G'day
- Posts: 2881
- Joined: Fri Nov 18, 2005 8:04 am
- Location: Sydney Australia
Hello nutty star
Thank you again,,,,,,,,,,seems quite logical
http://www-astronomy.mps.ohio-state.edu ... imass.html
But! some stars go though more than one shedding of layers.
The question is does the core remain in an ultra dense state made up of neutrons or does it collapse again into an UDM.
Iron I thought is produced in the outer core layer and not in the core.
It goes to show that the more you learn the more you feel like an EMU having its head in the sand.
Smile,,,,,,,,,,,thats me the EMU
Thank you again,,,,,,,,,,seems quite logical
http://www-astronomy.mps.ohio-state.edu ... imass.html
But! some stars go though more than one shedding of layers.
The question is does the core remain in an ultra dense state made up of neutrons or does it collapse again into an UDM.
Iron I thought is produced in the outer core layer and not in the core.
It goes to show that the more you learn the more you feel like an EMU having its head in the sand.
Smile,,,,,,,,,,,thats me the EMU
Harry : Smile and live another day.
Life in the Danger Zone
Starnut,
I very much appreciate the link to Dr. Pogge's website !
Having a succinct listing of the stages of stellar life and death and transfiguration as he puts it ! is extremely helpful.
I had that basic concept in my head, but many of the finerpoints were missing. Like the shockwave in nova progression. This makes a most excellent quick summary to explain to someone else the 'mainstream' astrophysics interpretation of stellar internal processes.
As my own organization of events is no where near so well organized nor accurate ! Empower knowledgeability !!!
Yesterday was such a nice calm sunny day, I decided to paint the house; a project under procrastination for some time now. 8 hours later it was 70% done, a quick wire brushing was the hard part. Today I have a slight sunburn ! And appreciate the stellar inner workings of energy release in a brand new way !!!
Oh, that brings to mind in 1955 how Professor Hottle in Massachusetts was one of the main cooks at a clam bake and lobster fest at the seashore one sunny summer day! He was a professor of thermal engineering at MIT? some big name school back there; anyway he was shirtless in the cooking area all afternoon having the time of his life ! He was in his 60's or so, and he got a really severe sunburn !!! He was as red as a boiled lobster !! Of course he has the skin tone of someone who is at his desk or indoors 24/7; and was most vulnerable. What makes it so funny is "he should have known !! " , of anybody there he would be the guy to know about that !
Well, if the glucosamine does its job I'll be able to finish the house today, provided my own sunburn doesn't get in the way!
Some days I'd rather paint the house than do physics.
Kovil
I very much appreciate the link to Dr. Pogge's website !
Having a succinct listing of the stages of stellar life and death and transfiguration as he puts it ! is extremely helpful.
I had that basic concept in my head, but many of the finerpoints were missing. Like the shockwave in nova progression. This makes a most excellent quick summary to explain to someone else the 'mainstream' astrophysics interpretation of stellar internal processes.
As my own organization of events is no where near so well organized nor accurate ! Empower knowledgeability !!!
Yesterday was such a nice calm sunny day, I decided to paint the house; a project under procrastination for some time now. 8 hours later it was 70% done, a quick wire brushing was the hard part. Today I have a slight sunburn ! And appreciate the stellar inner workings of energy release in a brand new way !!!
Oh, that brings to mind in 1955 how Professor Hottle in Massachusetts was one of the main cooks at a clam bake and lobster fest at the seashore one sunny summer day! He was a professor of thermal engineering at MIT? some big name school back there; anyway he was shirtless in the cooking area all afternoon having the time of his life ! He was in his 60's or so, and he got a really severe sunburn !!! He was as red as a boiled lobster !! Of course he has the skin tone of someone who is at his desk or indoors 24/7; and was most vulnerable. What makes it so funny is "he should have known !! " , of anybody there he would be the guy to know about that !
Well, if the glucosamine does its job I'll be able to finish the house today, provided my own sunburn doesn't get in the way!
Some days I'd rather paint the house than do physics.
Kovil
-
- G'day G'day G'day G'day
- Posts: 2881
- Joined: Fri Nov 18, 2005 8:04 am
- Location: Sydney Australia
Hello All
Happy Easter to one and all.
Thanks astroton, long life and happiness
With respect to the iron,,,,,,,,,,you maybe right.
But! I thought the core would be to dense to allow for any atomic structure to remain stabel. Maybe I'm wrong.
Have to find some sand.
Happy Easter to one and all.
Thanks astroton, long life and happiness
With respect to the iron,,,,,,,,,,you maybe right.
But! I thought the core would be to dense to allow for any atomic structure to remain stabel. Maybe I'm wrong.
Have to find some sand.
Harry : Smile and live another day.
how is ................
How is gold and other elements/substances, beyong the iron, made ???
Wolf Kotenberg
Iron accumulates at the core of high-mass stars due to a few reasons. First, it's produced there as the 'ash' of silicon fusion, the last fusion stage of large stars. Second, it's the most dense element being produced within the star (by fusion), so it tends to 'sink to the bottom' as it were. And third, even once fusion ceases in the core, silicon fusion continues in a shell around it, and this rains more iron down onto the rapidly growing core.
The core will remain stable until it exceeds the Chandrasekhar limit, I believe (I'm not entirely certain of this). However, once enough iron builds up, the mass of the core exceeds this limit and it very suddenly collapses into (more or less) a neutron star. The outer layers of the star fall inward at nearly half the speed of light, crash into this surface, and rebound. This is the beginning of a supernova explosion. But what truly drives the supernova is the massive release of neutrinos from the core, as protons and electrons combine to form neutrons. This wave of particles blasts the outer layers of the star apart in a huge shockwave.
This is also where gold is generally produced, along with most of the other elements heavier than iron. This blast of neutrinos reacts with the nuclei of other atoms in the stellar material, causing nuclear reactions that build up heavier materials (nucleosynthesis). Many of these products are themselves radioactive, and will decay into other heavy elements.
Kind of strange to think that all your jewellery came from inside a dying star someplace...![Laughing :lol:](./images/smilies/icon_lol.gif)
I'm not entirely certain what happens in the case of a dying star where the core mass grows rapidly enough to exceed the Tolman-Oppenheimer-Volkoff limit. It should promptly collapse into a black hole, I would think. This is one of the theoretical sources of those mysterious Gamma-Ray Bursts we keep finding across the sky: a 'hypernova'.
The core will remain stable until it exceeds the Chandrasekhar limit, I believe (I'm not entirely certain of this). However, once enough iron builds up, the mass of the core exceeds this limit and it very suddenly collapses into (more or less) a neutron star. The outer layers of the star fall inward at nearly half the speed of light, crash into this surface, and rebound. This is the beginning of a supernova explosion. But what truly drives the supernova is the massive release of neutrinos from the core, as protons and electrons combine to form neutrons. This wave of particles blasts the outer layers of the star apart in a huge shockwave.
This is also where gold is generally produced, along with most of the other elements heavier than iron. This blast of neutrinos reacts with the nuclei of other atoms in the stellar material, causing nuclear reactions that build up heavier materials (nucleosynthesis). Many of these products are themselves radioactive, and will decay into other heavy elements.
Kind of strange to think that all your jewellery came from inside a dying star someplace...
![Laughing :lol:](./images/smilies/icon_lol.gif)
I'm not entirely certain what happens in the case of a dying star where the core mass grows rapidly enough to exceed the Tolman-Oppenheimer-Volkoff limit. It should promptly collapse into a black hole, I would think. This is one of the theoretical sources of those mysterious Gamma-Ray Bursts we keep finding across the sky: a 'hypernova'.
Don't just stand there, get that other dog!
ta152h0
I mentioned the next part of Pogge's lecture in my last post. It explains how the rest of the periodic table is created during a supernova. I will give the link here.
http://www-astronomy.mps.ohio-state.edu ... rnova.html
Dave H
I am not sure if a merger of two neutron stars can produce anything but electromagnetic radiation and gravity wave and possibly a black hole! I would think that the combined gravity would be too strong to allow any matter to escape.
gary
I mentioned the next part of Pogge's lecture in my last post. It explains how the rest of the periodic table is created during a supernova. I will give the link here.
http://www-astronomy.mps.ohio-state.edu ... rnova.html
Dave H
I am not sure if a merger of two neutron stars can produce anything but electromagnetic radiation and gravity wave and possibly a black hole! I would think that the combined gravity would be too strong to allow any matter to escape.
gary
Fight ignorance!
I got you on this one Starnut I knew I had read it some place and lo an behold it be our very own beloved APOD
http://antwrp.gsfc.nasa.gov/apod/ap010405.html
Dave
http://antwrp.gsfc.nasa.gov/apod/ap010405.html
Dave
-
- G'day G'day G'day G'day
- Posts: 2881
- Joined: Fri Nov 18, 2005 8:04 am
- Location: Sydney Australia
Hello All
RE link:
http://antwrp.gsfc.nasa.gov/apod/ap010405.html
It talks about the early universe. Makes an assumtion that the Big Bang theory is true.
The universe is ageless and recyclic in my opinion. So rather than assuming age, its better to look at the actual process out there.
I had these links in my comp:
Neutron star
http://www.space.com/scienceastronomy/n ... 31203.html
Star birth
http://archive.ncsa.uiuc.edu/Cyberia/Bima/StarForm.html
http://www.stsci.edu/stsci/meetings/shst2/ballyj.html
http://cfa-www.harvard.edu/swas/science1.html
http://antwrp.gsfc.nasa.gov/cgi-bin/apo ... +Formation
http://www.plasmaphysics.org.uk/researc ... mation.htm
http://www-astronomy.mps.ohio-state.edu ... imass.html
Star death
http://archive.ncsa.uiuc.edu/Cyberia/Bi ... Death.html
http://www-astronomy.mps.ohio-state.edu ... rnova.html
RE link:
http://antwrp.gsfc.nasa.gov/apod/ap010405.html
Where did the gold in your jewelry originate? No one is completely sure. The relative average abundance in our Solar System appears higher than can be made in the early universe, in stars, and even in typical supernova explosions. Some astronomers now suggest that neutron-rich heavy elements such as gold might be most easily made in rare neutron-rich explosions such as the collision of neutron stars
It talks about the early universe. Makes an assumtion that the Big Bang theory is true.
The universe is ageless and recyclic in my opinion. So rather than assuming age, its better to look at the actual process out there.
I had these links in my comp:
Neutron star
http://www.space.com/scienceastronomy/n ... 31203.html
Star birth
http://archive.ncsa.uiuc.edu/Cyberia/Bima/StarForm.html
http://www.stsci.edu/stsci/meetings/shst2/ballyj.html
http://cfa-www.harvard.edu/swas/science1.html
http://antwrp.gsfc.nasa.gov/cgi-bin/apo ... +Formation
http://www.plasmaphysics.org.uk/researc ... mation.htm
http://www-astronomy.mps.ohio-state.edu ... imass.html
Star death
http://archive.ncsa.uiuc.edu/Cyberia/Bi ... Death.html
http://www-astronomy.mps.ohio-state.edu ... rnova.html
Harry : Smile and live another day.
Dave,
Now I remember that APOD posting. Gads, was it 5 years ago?! Thanks for the reminder. Unfortunately, some of the links in the explanation no longer exist. There is a neat movie of a neutron star merger in the link "collision" showing the two stars merging over (!) the Atlantic Ocean, an impossible scenario! At the end of the movie, the merged neutron star disappears, turning, I guess, into a black hole.
But that still doesn't explain how the "decompression of neutron star material" during the merger could enable the neutrons to escape the very deep gravity well! After all, the escape velocity for a neutron star is 1/2c! Is there a process by which a stellar event can accelerate heavy matter like neutrons and protons to such high speed?
gary
Now I remember that APOD posting. Gads, was it 5 years ago?! Thanks for the reminder. Unfortunately, some of the links in the explanation no longer exist. There is a neat movie of a neutron star merger in the link "collision" showing the two stars merging over (!) the Atlantic Ocean, an impossible scenario! At the end of the movie, the merged neutron star disappears, turning, I guess, into a black hole.
But that still doesn't explain how the "decompression of neutron star material" during the merger could enable the neutrons to escape the very deep gravity well! After all, the escape velocity for a neutron star is 1/2c! Is there a process by which a stellar event can accelerate heavy matter like neutrons and protons to such high speed?
gary
Fight ignorance!
-
- G'day G'day G'day G'day
- Posts: 2881
- Joined: Fri Nov 18, 2005 8:04 am
- Location: Sydney Australia
Hello Starnut
The drive comes from the spin creating jets that eject material out.
http://skyandtelescope.com/news/article_1627_1.asp
http://universe.nasa.gov/press/2003/030220a.html
Neutron star collision
http://www.space.com/scienceastronomy/n ... 31203.html
The drive comes from the spin creating jets that eject material out.
http://skyandtelescope.com/news/article_1627_1.asp
http://universe.nasa.gov/press/2003/030220a.html
Neutron star collision
http://www.space.com/scienceastronomy/n ... 31203.html
Harry : Smile and live another day.
Hello All,
This KBoooooooooooom is more interesting....
http://www.csmonitor.com/2002/1120/p01s02-ussc.html
This KBoooooooooooom is more interesting....
http://www.csmonitor.com/2002/1120/p01s02-ussc.html
The Universe Is What You Think It Is. Every Thought Ever Thought Is True.
This Professor has interesting things to say about neutron stars and GRB's. From what I gather these stars have parts core, surface etc.... when they merge to form black holes perhaps the cores merge right through the less dense surface stuff mimicking the hyper nova black hole inside the still existing star for a brief moment picture. That matter that is left out of the black hole formation clogs at the event horizon super heats and blows. Angular momentum has to factor in big also. It’s all way outside of my league but what I do know is that black hole aren’t very efficient eaters and stuff gets clogged up trying to get in, sort of like shoppers trying to get into the Wal-Mart in the day after thanksgiving sale.
http://www.astro.umd.edu/~miller/nstar.html
Dave
http://www.astro.umd.edu/~miller/nstar.html
Dave
The clogging up is what is required to cause black holes to be some of the most luminous objects in the universe. But all in all black holes have a tiny overall effect.most the mass of the 5% of knowable stuff in the universe is cold dust and gas (very disfused,dark and boring).floating in the incrediblly large space that separates the galaxies. The point is the universe is mainly empty, at least of knowable stuff.
-
- G'day G'day G'day G'day
- Posts: 2881
- Joined: Fri Nov 18, 2005 8:04 am
- Location: Sydney Australia
Hello Dave
Black holes, neutron stars, stars etc are made from plasma.
Plasma makes up about 95% of the mass that we see.
Black holes we cannot not see. As matter breaks up way before it enters the black hole it realeases large amounts of light and this is what we see.
Black holes, neutron stars, stars etc are made from plasma.
Plasma makes up about 95% of the mass that we see.
Black holes we cannot not see. As matter breaks up way before it enters the black hole it realeases large amounts of light and this is what we see.
Harry : Smile and live another day.
Harry,
To some extend we are saying the same thing , I think the key phrase here is acceleration disk.But in the case of our giant meighbor Eta Carinae the core of the star will colapse instantly into black hole while the star is still shining and as out lying matter starts to fall in it locks into a super heating spherical shell at the event horizion of the black hole.The heat and pressure reaches very high levels and in a instant there is a cascade of events that lead to the largest explosions in the universe.
To some extend we are saying the same thing , I think the key phrase here is acceleration disk.But in the case of our giant meighbor Eta Carinae the core of the star will colapse instantly into black hole while the star is still shining and as out lying matter starts to fall in it locks into a super heating spherical shell at the event horizion of the black hole.The heat and pressure reaches very high levels and in a instant there is a cascade of events that lead to the largest explosions in the universe.
Well if these events are beamed witch hasn't been proven we would have to be better off. But we know so little about these events there has only been a few in which we have gotten visual light. But what we do know is Eta is huge and therefore very unstable and not that far away if we consider the amount of energy that could be released in less then 2 min.