BA: AstroAlert: Type Ia supernova in M101! (SN 2011fe)

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Thu Sep 15, 2011 12:42 pm

neufer wrote:
Beyond wrote:
tickety-boo Danny Kaye science terminology. Yeah, it's good.
It is my fervent wish that owlice watch Danny Kaye video
and be incapable of ever bicycling again
without the tickety-boo song running thru her head. :twisted:
I don't know about owlice, but you sure put that song in my head, Art! :evil:

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Beyond » Fri Sep 16, 2011 12:55 am

:lol: I said the 'terminology' was good - referring to tickety-boo. I DIDN"T listen to the video, so i have no idea what the tune is like.
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Fri Sep 16, 2011 2:32 am

Yeah, yeah, yeah... you guessed it....

On Fri, 16 Sep 2011 02:13:27 GMT, SN 2011fe was, as far as http://www.rochesterastronomy.org/supernova.html knows, still at magnitude 9.9.
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Tickety-boo!!!!
















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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by neufer » Fri Sep 16, 2011 2:49 am

Ann wrote:
Tickety-boo!!!!
It is my fervent wish that Ann is now incapable of ever bicycling
again without the tickety-boo song running thru her head. :clap:
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Sat Sep 17, 2011 5:56 am

You guessed it. On Sat, 17 Sep 2011 03:23:03 GMT, the supernova was still at magnitude 9.9. Tickety-boo and all.

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Sun Sep 18, 2011 4:50 am

I don't need to tell you what the magnitude of SN 2011fe was on Sun, 18 Sep 2011 02:11:16 GMT. You know already.

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Mon Sep 19, 2011 2:41 am

Yeah, yeah, yeah...

Sun, 18 Sep 2011 23:40:38 GMT

Name: SN 2011fe

Type: Ia

Mag: 9.9

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by neufer » Mon Sep 19, 2011 3:33 am

Ann wrote:Yeah, yeah, yeah...

Sun, 18 Sep 2011 23:40:38 GMT
Name: SN 2011fe
Type: Ia
Mag: 9.9
At least it is relatively Blue!
http://www.aavso.org/supernova-science-general wrote: SN 2011fe is a bit bluer than SN 1994D
RHM's picture
Posted: September 12, 2011 - 1:16pm

Yes, you're absolutely right. The graph below shows that while SN 2011fe is tracking SN 1994D pretty well in V, R and I passbands, it's a bit brighter in the B-band. What exactly does that mean? It's not clear yet. I'd like to see a comparison of the spectra

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Mon Sep 19, 2011 5:40 am

It does appear to be blue. As to what it means, my instinctive guess would be that it is slightly brighter than the other supernova, SN 1994D.

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by neufer » Mon Sep 19, 2011 2:14 pm

Ann wrote:
It does appear to be blue. As to what it means, my instinctive guess would be that it is slightly brighter than the other supernova, SN 1994D.
Click to play embedded YouTube video.
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by neufer » Mon Sep 19, 2011 3:58 pm

http://astrobob.areavoices.com/?blog=78068 wrote:
Pinwheel Galaxy supernova at brightest; Comet Garradd beckons
Posted on September 17, 2011 by astrobob

<<I am jazzed up. I finally got a picture of the supernova SN 2011fe in the Pinwheel Galaxy last night using only a telephoto lens on a tracking mount. The path starts at bright Mizar and zigzags its way up to the supernova, which lies just beyond the arrow tip in the Pinwheel Galaxy in this photo taken last night (Sept. 16). Alkaid and Mizar are the two stars at the end of the Big Dipper's Handle. Details: 150mm lens, f/2.8, ISO 800 and 2-minute exposure. (Photo: Bob King) :arrow:

The moon is now nearly at last quarter and doesn’t flood the sky with light like it does around full phase. This provides us all with another round of opportunities to see the supernova before it fades. For almost a week, it’s been humming along at magnitude 9.9. As you can tell from the before-and-after sequence above, it’s hard to miss!
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Tue Sep 20, 2011 1:38 am

It's fading!!! :o :shock: :shock:

On Mon, 19 Sep 2011 22:40:34 GMT, SN 2011fe was at magnitude 10.0!

And hey, Art, that's a nice Bob King image of the end part of the handle of the Big Dipper and M101. The picture is actually in color! At first it's very hard ot miss that it is actually in color, but check out that unmistakable, although subtle, blue halo around Alkaid! :jumping up and down smilie: There is a hint of blue in the halo around Mizar too, but it is even subtler, and rightly so, because Alkaid really is much bluer than Mizar!

Note, too, the one obviously yellow-looking star in this image, the second one from Alcor in "the wiggly path to the supernova" in this image. The yellow star is 83 Ursa Majoris or IQ Ursa Majoris. I like the name, IQ Ursa Majoris! Although my favorite IQ star is IQ Aurigae, a star classified as an A0pSi star which is as blue as a B4 star!

Still, IQ Ursa Majoris is interesting enough. It is classified as a M2III star, so it is really cool and quite bright, too. It is about 300 times the luminosity in yellow-green light, but since a star of spectral class M2 peaks well into the infrared part of the spectrum, the bolometric (total) energy output of this star is likely several thousand times that of the Sun.

It's so much fun to discover that what looked like a black and white image is really a color picture, and then it's even more fun to try to read its colors! :jumping up and down: :jumping up and down:

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by neufer » Tue Sep 20, 2011 3:07 am

Ann wrote:
It's fading!!! :o :shock: :shock:

On Mon, 19 Sep 2011 22:40:34 GMT, SN 2011fe was at magnitude 10.0!
It should be noted that SN 2011fe got to a visual magnitude comparable with that of the brightest (blue hypergiant) stars of the Large Magellanic Cloud which is over a hundred times closer to us than M101 :!:
http://en.wikipedia.org/wiki/S_Doradus wrote:
<<S Doradus is the brightest star in the Large Magellanic Cloud, a satellite of the Milky Way. A hypergiant, it is one of the most luminous stars known (sometimes more luminous than −10 absolute magnitude), but so far away that it is invisible to the naked eye. This star belongs to its own eponymous S Doradus class of variable stars (these classes are usually named after their prototypes); also designated as the class luminous blue variable or LBV. S Doradus exhibits long, slow changes in brightness, punctuated by occasional outbursts.>>
http://www.daviddarling.info/encyclopedia/S/S_Doradus.html wrote: <<The brightest star in the Large Magellanic Cloud (LMC), one of the brightest stars known, and the prototype for the class of variable known as S Doradus stars (luminous blue variables). It lies in the young open cluster NGC 1910 on the northern rim of the LMC's central bar.

S Doradus has a spectrum very similar to that of P Cygni (see P Cygni profile), another variable of the same type. These stars are extremely massive (at least 60 solar masses) and luminous, using up their nuclear fuel so fast that their lifetimes can't exceed a few million years; they will then explode as supernovae. The very high luminosity also results in an enormous radiation pressure at the star's surface, which tends to blow away significant portions of the stellar mass by way of an intense stellar wind and, occasionally, in the form of an ejected gaseous shell. The light curve of S Doradus also points to a long period (40-year) eclipsing variable behavior.

Recent observations of S Dor have shown that its optical spectrum now resembles that of an F-type supergiant, with a rich complex of absorption lines. Despite nearly 50 years of spectroscopic monitoring, such a spectrum has never previously been seen for S Dor despite many occasions when the star was equally bright. Such F-type spectra have, however, been seen in other luminous blue variables, including Var B in M33 during a recent outburst, and in Eta Carina during an outburst in 1893. The singly ionized metal lines arise in a layer moving away from the star (toward us) at 50 km/s, consistent with the lines forming in a "pseudo photosphere" originating in the stellar wind. The temperature suggested by the F-type spectrum is as cool as an LBV can get.>>
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Beyond » Tue Sep 20, 2011 3:32 am

I don't know if the super nova was really all that bright. It blew itself up, didn't it :?: :mrgreen:
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by neufer » Tue Sep 20, 2011 3:46 am

Beyond wrote:
I don't know if the super nova was really all that bright. It blew itself up, didn't it :?: :mrgreen:

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Wed Sep 21, 2011 12:35 am

On Tue, 20 Sep 2011 23:19:56 GMT, the supernova was still at magnitude 10.0.

Art, I love your "about-to-explode" ever bluer woman! :lol:

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Beyond » Wed Sep 21, 2011 3:26 am

That came from one of those Willy Wonka Chocolate Factory movies, but i don't remember which one. She ate an experimental blueberry chocolate something or other, that they were told not to eat because it had some strange side effects. As you can see--she was rather disobedient and became a human blueberry, A very-very mini blueberry nova. Just one of many things that went on, until they were wittled down to the winner that would take over running the chocolate factory from Willy Wonka.
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Thu Sep 22, 2011 3:14 am

On Thu, 22 Sep 2011 03:00:40 GMT, the supernova was still at magnitude 10.0. It is not fading rapidly, that's for sure.

Beyond, thanks for the info about the blue woman! A "blueberry nova", indeed!

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Sat Sep 24, 2011 6:06 am

On Sat, 24 Sep 2011 05:30:23 GMT, the supernova was still magnitude 10.0.

You can't accuse it of fading slowly.

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Mon Sep 26, 2011 12:39 am

Wow! I was lazy here! I didn't check out the supernova yesterday. I should have, because it's really fading now! On Sun, 25 Sep 2011 23:22:18 GMT, SN 2011fe was "only" magnitude 10.5!

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Beyond » Mon Sep 26, 2011 1:47 am

It's 'pooped'. After expending all that energy, it's retiring from it's supernova job and getting ready to take up something easier for the rest of it's life. :mrgreen:
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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Mon Sep 26, 2011 3:18 am

Beyond wrote:It's 'pooped'. After expending all that energy, it's retiring from it's supernova job and getting ready to take up something easier for the rest of it's life. :mrgreen:
I guess it will go to the great green pastures of the retired supernovae in the sky!

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Mon Sep 26, 2011 5:08 pm

They measured it again on Mon, 26 Sep 2011 03:08:46 GMT. It's still 10.5.

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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by Ann » Tue Sep 27, 2011 5:12 pm

On Tue, 27 Sep 2011 03:06:55 GMT, the supernova was still mag. 10.5.

I don't know about the rest of you, but I find these leaps and jumps and plunges in brightness, interspersed with plateaus, confusing.
Image


The light curve of Supernova 2011fe, a mesa-like shape?















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Re: BA: AstroAlert: Type Ia supernova in M101!

Post by rosettastoned » Tue Sep 27, 2011 7:18 pm

Umm, after browsing through this thread I don't see so many jumps and plunges in your many reports Ann. In fact I seem to recall the word 'boring' a couple of times ;P
Follows the early predicted behaviour very well, but I can't seem(or is it can't be bothered?) to find an actual published spectra of this SN. Anyone got a link, maybe?
Haven't thought about the colour of 1as to be the same all over, but this is really the first SN I've observed, and I guess as a SN virgin I don't have any foundation for an opinion :o

btw: thx for the reports Ann, I'm too lazy to look for these things myself ;)

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