How much time takes a "Supernova" from beginning to end of it´s explosion?

Question

i want to know, aproximately, if a supernova explosion is a hurry event, or maybe it can be extended to many years to consume itself when it explodes.
´cause i´ve searched this in 100000000000000 books, and any of them, talks about this .
someone must to know!!!!

Answer 1

Hi KINGASTAR

Here's an excerpt from a tutorial I wrote on supernovas. This is a stylised "diary" of a recently catalogued supernova explosion: SN1987A:



SN1987A diary
The star which would one day produce SN1987A begins its life on the main sequence as a blue supergiant star named Sk-69202. It is about 20 solar masses in size.

The first stage of its life is hydrogen burning. At the beginning it has a core temperature of about 40 million Kelvin and a central density of about 5g/cm3. As it burns hydrogen it begins depositing Helium in the core, which begins collapsing inward, raising temperatures and pressures. This hydrogen burning period lasts about 9 million years (compare to a few billion years for our sun!).

When the temperature reaches about 170 million Kelvin and pressure is up about 900g/cm3 our star undergoes helium flash and begins fusing helium and dumping carbon at the core. This period will last another million years.

Towards the end of the helium burning period, the temperature at Sk-69202's core has reached 700 million Kelvin. The pressure has rocketed to 200 kilograms/cm3. At this point the star undergoes a central shock called carbon detonation. Carbon ignites explosively enough to tear apart some smaller stars, in this case Sk-69202 is large enough to survive. The core begins fusing carbon for the next million years or so.

Towards the end of the million year carbon fusion period, Sk-69202 is not feeling so well. The temperature at the core has climbed past the billion degree mark, the core pressure a crushing 10 metric tonnes/cm3. The star begins fusing Neon, and within a year or so it begins fusing Oxygen. By the end of the next year the temperature has passed 3 billion Kelvin and is well on towards 4 billion. The core pressure has increased 10 times over in a year. Sk-69202 is now fusing silicon into iron and the end is very near.

It will take the giant star a matter of days to exhaust its silicon fuel and create an iron core. The temperature at the core will exceed 200 billion kelvin, the pressure 200 million tonnes/cm3. The core won't ignite and begins to collapse under its own gravity. Electrons and protons are fused into neutrons as the entire core mass collapses in less than half a second, brought to a shuddering halt at nuclear density. 99% of the coming supernova's energy streams out of the collapsing core as neutrinos as the core rebounds against neutron degeneracy pressure and the shockwave tears the outer layers of Sk-69202 apart. In the first second the supernova rockets from near invisibility to an apparent magnitude of +4 (absolute magnitude -14!). The apparent magnitude climbs to +3 (absolute magnitude -15) over the next 80 days or so before peaking and falling away uniformly over the following two years.



Hope this helps!
The Chicken

Answer 2

The energy release that blows the star apart in a supernova only takes a few seconds, unlike most stages in stellar evolution, which take millions of years. After the bang, the outer layers of the star which were blown away cool down over a few days and drift apart for thousands of years.

Answer 3

A type 1A supernova has a period of high luminosity for several months. That's when it outshines the entire galaxy it's in. After a few months, the energy drops off, but the shock wave and stellar debris keep expanding. The Crab Nebula, for example, is what's left of a star in our galaxy that went supernova in 1054 A.D. It is still expanding.

Answer 4

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Answer 5

Ok....You searched many books.... but to my understanding "supernovas " is a fav subject to you.:)
get this site...and ....Loose your self surfing it.;)

http://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search?supernova

Answer 6

quit fast because its just light that you see combusting its like a shooting star type of thing and since light travels at 180,000 miles per second i think its pretty fast

Answer 7

I think Dalina should win.