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Re: Is Betelgeuse About to go Supernovae?

Posted: Tue Jan 21, 2020 4:37 pm
by shpalman

Re: Is Betelgeuse About to go Supernovae?

Posted: Thu Feb 27, 2020 5:10 am
by plodder
don’t be so gloomy. here’s the content you need:

https://mobile.twitter.com/starstricken ... 3606515712

Re: Is Betelgeuse About to go Supernovae?

Posted: Thu Feb 27, 2020 8:31 am
by cvb
plodder wrote:
Thu Feb 27, 2020 5:10 am
don’t be so gloomy. here’s the content you need:

https://mobile.twitter.com/starstricken ... 3606515712
That's cool. Thanks for the link.

Re: Is Betelgeuse About to go Supernovae?

Posted: Thu Feb 27, 2020 8:42 am
by tenchboy
cvb wrote:
Thu Feb 27, 2020 8:31 am
plodder wrote:
Thu Feb 27, 2020 5:10 am
don’t be so gloomy. here’s the content you need:

https://mobile.twitter.com/starstricken ... 3606515712
That's cool. Thanks for the link.
The one a few below 'of the moon making an appearance on our satelite images of the sun' reminds me of...
Spoiler:

Re: Is Betelgeuse About to go Supernovae?

Posted: Fri Aug 14, 2020 12:18 pm
by AMS
Dust, apparently, and originating from the star itself. (Someone tell Philip Pullman.)

https://www.theguardian.com/science/202 ... betelgeuse

Is it normal for star to kick out enough dust to hide it from view?

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 12:49 pm
by Martin Y
I didn't follow that twitter link till now and I wonder if I misconstrued its talking about convection cells and starspots: is it actually possible to resolve any features at all of an object (even Betelgeuse-sized) 200 parsecs away? That seems impossible but I do keep finding myself having to recalibrate my boundaries of the possible.

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 1:01 pm
by JQH

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 1:03 pm
by Gfamily
Martin Y wrote:
Sat Aug 15, 2020 12:49 pm
I didn't follow that twitter link till now and I wonder if I misconstrued its talking about convection cells and starspots: is it actually possible to resolve any features at all of an object (even Betelgeuse-sized) 200 parsecs away? That seems impossible but I do keep finding myself having to recalibrate my boundaries of the possible.
Betelgeuse was resolved as a disc using optical interferometry as early as the 1930's I think.

ETA 1920 apparently

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 1:13 pm
by Martin Y
Thanks. <recalibrates>

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 3:36 pm
by dyqik
AMS wrote:
Fri Aug 14, 2020 12:18 pm
Dust, apparently, and originating from the star itself. (Someone tell Philip Pullman.)

https://www.theguardian.com/science/202 ... betelgeuse

Is it normal for star to kick out enough dust to hide it from view?
Whole galaxies do it sometimes.

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 3:38 pm
by dyqik
Gfamily wrote:
Sat Aug 15, 2020 1:03 pm
Martin Y wrote:
Sat Aug 15, 2020 12:49 pm
I didn't follow that twitter link till now and I wonder if I misconstrued its talking about convection cells and starspots: is it actually possible to resolve any features at all of an object (even Betelgeuse-sized) 200 parsecs away? That seems impossible but I do keep finding myself having to recalibrate my boundaries of the possible.
Betelgeuse was resolved as a disc using optical interferometry as early as the 1930's I think.

ETA 1920 apparently
Here's an image from December.
200214112231-betelgeuse-dec-2019-super-169.jpg
200214112231-betelgeuse-dec-2019-super-169.jpg (12.92 KiB) Viewed 336 times

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 3:42 pm
by dyqik
Betelgeuse is 55 milli arcseconds in apparent diameter.

The EHT observations of M87 and SgrA* have an angular resolution of 25 micro arcseconds, so could theoretically put 2000 pixels across Betelgeuse.

Unfortunately stars are really boring to look at in the submm-wave continuum. We get far more information from spectral line observations that don't fully resolve the disk of the star.

Re: Is Betelgeuse About to go Supernovae?

Posted: Sat Aug 15, 2020 4:47 pm
by Martin Y
dyqik wrote:
Sat Aug 15, 2020 3:42 pm
Betelgeuse is 55 milli arcseconds in apparent diameter.
I caught myself thinking "I know it's enormously bigger than the sun but 55mas at 200 parsecs; that would make Betelgeuse several times bigger than the entire orbit of the earth and... Oh. Wait. It is." Got the nagging feeling this was all familiar when I was young and I've got stupid. Guess I just haven't thought about in ages.