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UW Astronomers Find A Rare Supernova 'Imposter' In A Nearby Galaxy (washington.edu)
After a star explodes as a supernova, it usually leaves behind either a black hole or what's called a neutron star -- the collapsed, high-density core of the former star. Neither should be visible to Earth after a few weeks. But this supernova -- SN 2010da -- still was.
"SN 2010da is what we call a 'supernova imposter' -- something initially thought to be a supernova based on a bright emission of light, but later to be shown as a massive star that for some reason is showing this enormous flare of activity," said Breanna Binder, a University of Washington postdoctoral researcher in the Department of Astronomy and lecturer in the School of STEM at UW Bothell. Many supernova imposters appear to be massive stars in a binary system -- two stars in orbit of one another. Stellar astrophysicists think that the impostor's occasional flare-ups might be due to perturbations from its neighbor.
"SN 2010da is what we call a 'supernova imposter' -- something initially thought to be a supernova based on a bright emission of light, but later to be shown as a massive star that for some reason is showing this enormous flare of activity," said Breanna Binder, a University of Washington postdoctoral researcher in the Department of Astronomy and lecturer in the School of STEM at UW Bothell. Many supernova imposters appear to be massive stars in a binary system -- two stars in orbit of one another. Stellar astrophysicists think that the impostor's occasional flare-ups might be due to perturbations from its neighbor.
His erect penis,
Plugged inside a man's anus.
He is a faggot.
That haiku reminds me of the time a faggot raped me in the ass. I screamed in pain and cried for days. It took me months of therapy to regain my manhood.
starvation & deception remain #1 killers world wide... cease fire... hugs not thugs... no bomb us more mom us.. wizard & warlok inspired zeus weapon being fired off willy nilly during the shake rattle & ice us campaign..?. we must like it because we pay for it all? .0001% of us do almost all the damage.. on purpose?
Since XBiz took over, and this new Beau mod came in, this site is a clusterfuck of boring news.... clean out the spam from the submissions, so at least i can read that... you lazy bum
Star: *Bwuuuurp* Damn! Excuse me! I swallowed a bit too much interstellar gas.
Table-ized A.I.
The galaxy NGC 300 is 6.07 ± 0.23 Mly away but they are talking about one series of events from less than 5 million years ago, which means we will not know about it for another million years. "they discovered that most nearby stars were created in two bursts — one 30 million years ago and the other less than 5 million years ago."
Why does this editor ignore submissions and post whatever he wants almost all the time? If all you do is ignore submissions and post your own crap why bother making submissions anymore?
or any other possible at further evolution.
Many years ago, astronomers noticed that some stars, usually red giants with white dwarfs orbiting them, would flare up every once in awhile. Since oftentimes these stars were, most of the time, too dim to be conspicuous, many of them were uncatalogued at the time that they flared up. So it looked as though new stars were coming into existence, so they were given the name "stella novae" (new stars) which was shortened to "novae" (singular "nova). This was the usual case---matter from a red giant dumps a bunch of hydrogen on a white dwarf, the hydrogen burns very quickly and brightly, and when the reaction is over both stars still exist.
Then folks realized that some stars blow themselves out of existence. These were named supernovae in contrast to ordinary novae.
And today we find an ordinary nova in another galaxy, but instead of calling it that, we call it an imposter supernova. I'm offended.
This seems to imply that the astronomical phenomenon is trying to pull one over of the astronomer.
This just sounds like hubris.
Astronomer 1: "As you can see the supernova ..."
Astronomer 2: "Wait, doesn't a star turn into a black hole or a neutron star after collapse?"
Astronomer 1: "...... IMPOSTER!"
My eyes reflect the stars and a smile lights up my face.
SN 2010da was a pretty darned good nova. But supernova? Hardly.
I wouldn't call it an impostor. Poseur is more like it.
Supernovae result in either a white dwarf or a neutron star. To date there has been not a single supernova that has been verified to have resulted in a black hole. Given that white dwarfs are quite visible, I can only wonder what the story is really about.
A core-collapse supernova is theorized to produce a neutron star. This type of explosion is regarded as the end stage of evolution of a star much more massive than the Sun having enough mass to fuse heavier elements when it exhausts hydrogen form its core.
A white dwarf is theorized to be the end stage of evolution of a star much like our Sun. Such stars are not massive enough to end in core-collapse after fusing all the light elements. Instead, they end their lives by intense mass outflow resulting in a "planetary" nebula, and what is left behind is the white dwarf.
A white dwarf accreting mass from an evolved binary companion, especially a swollen red giant that has expanded its atmosphere, such a star can generate "ordinary nova" explosions (rapid fusion of the accreted matter) that leave the white dwarf behind to "do it again" in the future. A white dwarf that accretes a critical amount of mass, however, explodes with the violence of the Type Ia supernova, a particularly bright "standard candle" used in cosmology research from which "accelerating expansion" and "dark energy" has been hypothesized to describe the evolution of the Universe. When one of these blows, it leaves nothing behind.
Sheesh, people know as much about stellar evolution as elephant evolution . . .
So what you're saying is a red giant never forgets?