Betelgeuse is fainting.

Probably nothing serious but who knows?

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Re: Betelgeuse is fainting.

#61  Postby NineBerry » Jan 23, 2020 2:03 pm

newolder wrote:It's certainly a young star and consuming its fuel at a prodigious rate.


So, it is the USA among the stars?
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Re: Betelgeuse is fainting.

#62  Postby newolder » Jan 23, 2020 2:44 pm

Hmmm... Making comparisons between Betelgeuse and primitive earthly economies is too tricky for me.

Image

More data at ESO link
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Re: Betelgeuse is fainting.

#63  Postby Ironclad » Jan 23, 2020 7:33 pm

Does anyone know how long this explosion would be seen illuminating our daytime sky? Would it be 1000s of years?
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Re: Betelgeuse is fainting.

#64  Postby newolder » Jan 23, 2020 7:44 pm

A few weeks, probably.
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Re: Betelgeuse is fainting.

#65  Postby elderberryhat » Jan 24, 2020 5:58 pm

Slightly off topic but I wondered does anyone know why they refer to a star's brightness as its velocity? I remember reading a book about astronomy when I was a kid and it talked about brighter stars having a greater velocity, and then getting confused when I found out that velocity means speed.
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Re: Betelgeuse is fainting.

#66  Postby newolder » Jan 24, 2020 10:51 pm

Luminosity and associated brain fade, perhaps? :dunno:
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Re: Betelgeuse is fainting.

#67  Postby i have no avatar » Jan 24, 2020 11:26 pm

elderberryhat wrote:Slightly off topic but I wondered does anyone know why they refer to a star's brightness as its velocity? I remember reading a book about astronomy when I was a kid and it talked about brighter stars having a greater velocity, and then getting confused when I found out that velocity means speed.


I have never heard of the term "velocity" being applied to the brightness of a star. As far as a star's velocity through space is concerned, I have always heard the term "proper motion". It is related to the velocity of the star wrt the Sun (direction and distance play a part too).

Did you perhaps hear of "magnitude" instead? This term may also be confusing because a brighter object has a lower magnitude than a fainter object.
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Re: Betelgeuse is fainting.

#68  Postby newolder » Feb 02, 2020 5:36 pm

From the latest Astronomer's telegram (Feb. 1st)

... the minimum brightness is expected on 21 (+/-7d) February, 2020. ...


:popcorn:
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Re: Betelgeuse is fainting.

#69  Postby Ironclad » Feb 04, 2020 10:10 am

https://youtu.be/i93Z7zljQ7I

Just in case anyone forgot just how large this creature is.. 02:50 ish
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Re: Betelgeuse is fainting.

#70  Postby Cito di Pense » Feb 06, 2020 6:58 pm

Ironclad wrote:https://youtu.be/i93Z7zljQ7I

Just in case anyone forgot just how large this creature is.. 02:50 ish


I'm large but I'm far away, I'm cool but I'm nearly-dead...

Sounds like an Alanis Morissette song... But hey, the meter works...
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Re: Betelgeuse is fainting.

#71  Postby scott1328 » Feb 06, 2020 9:08 pm

Isn't it ironic?
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Re: Betelgeuse is fainting.

#72  Postby newolder » Feb 06, 2020 9:44 pm

Metallicity [Fe/H] +0.05 dex
- wiki on Betelgeuse

Where:
In physics and astrophysics, the number of orders of magnitude between two numbers is sometimes referred to as "dex", a contraction of "decimal exponent" (see f.e. Chemical abundance ratios). For instance, if two numbers are within 1 dex of each other, then the ratio of the larger to the smaller number is less than 10. Fractional values can be used, so if within 0.5 dex, the ratio is less than 100.5, and so on.
- wiki definition

Since 100.05 ~ 1, does that mean Betelgeuse's ratio [Fe/H] is close to 1? :ask: If so, then Betelgeuse is indeed ironic and/or doesn't have much hydrogen left...
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Re: Betelgeuse is fainting.

#73  Postby Hermit » Feb 07, 2020 5:25 am

Cito di Pense wrote:
Ironclad wrote:https://youtu.be/i93Z7zljQ7I

Just in case anyone forgot just how large this creature is.. 02:50 ish


I'm large but I'm far away, I'm cool but I'm nearly-dead...

Sounds like an Alanis Morissette song... But hey, the meter works...

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Re: Betelgeuse is fainting.

#74  Postby Fallible » Feb 07, 2020 7:29 am

Ha! I was going to post that yesterday, then got distracted.
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Re: Betelgeuse is fainting.

#75  Postby felltoearth » Feb 07, 2020 1:37 pm

newolder wrote:
Metallicity [Fe/H] +0.05 dex
- wiki on Betelgeuse

Where:
In physics and astrophysics, the number of orders of magnitude between two numbers is sometimes referred to as "dex", a contraction of "decimal exponent" (see f.e. Chemical abundance ratios). For instance, if two numbers are within 1 dex of each other, then the ratio of the larger to the smaller number is less than 10. Fractional values can be used, so if within 0.5 dex, the ratio is less than 100.5, and so on.
- wiki definition

Since 100.05 ~ 1, does that mean Betelgeuse's ratio [Fe/H] is close to 1? :ask: If so, then Betelgeuse is indeed ironic and/or doesn't have much hydrogen left...

Oh the irony....
Sorry couldn’t resist.

Is the ratio based on mass or number of atoms? Sorry for the n00b question.


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Re: Betelgeuse is fainting.

#76  Postby newolder » Feb 07, 2020 1:46 pm

felltoearth wrote:...
Oh the irony....
Sorry couldn’t resist.

Is the ratio based on mass or number of atoms? Sorry for the n00b question.


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No worries. My reply was supposed to continue the irony discussion of the preceding 2 posts.

Since stellar constituents are determined by spectroscopy, the elemental ratios are atomic.
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Re: Betelgeuse is fainting.

#77  Postby felltoearth » Feb 08, 2020 10:40 pm

:thumbup:
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Re: Betelgeuse is fainting.

#78  Postby newolder » Feb 15, 2020 9:42 am



Story behind this tube @ today's spaceweather.com

...

What's going on? The researchers aren't sure why Betelgeuse looks so different, but they suspect the involvement of dust. Red supergiants like Betelgeuse create and eject vast amounts of dusty material, losing mass even before they explode as supernovas. The lopsided shape and dimming of Betelgeuse might be explained if a cloud of dust is partially blocking its disk. Indeed, VLT infrared observations of Betelgeuse at the same time reveal lots of dust around the star.

...
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Re: Betelgeuse is fainting.

#79  Postby Macdoc » Feb 15, 2020 12:48 pm

hah ...beat me to it ...that's a really effective image.

Informative coverage in The Star today

New photo of a star that people hope will explode shows it fading and changing shape
Betelgeuse appears 'hidden behind ... a sort of curtain,' says astronomer

Nicole Mortillaro · CBC News · Posted: Feb 15, 2020 4:00 AM ET | Last Updated: 3 hours ago


https://www.cbc.ca/news/technology/bete ... -1.5464353

well all I can say is if I get to see a supernova in my lifetime I'd be quite pleased ...I was thinking this was the top astronomical event for me.

Image

walked out of the apartment in Hermanus to see that covering a big chunk of sky over the ocean. So far that, a total eclipse in the 60s and a wonderful green earth grazer meteor dripping fire were sky watching hilights. ( mind you seeing a Hailey's comet debris meteor shower while 40 km offshore in Cairns was quite the visual treat too in 2018 ).Was great to share it with my daughter.

Cap it with a "safe distance" super nova ??? ...bring it on :D
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Re: Betelgeuse is fainting.

#80  Postby newolder » Feb 17, 2020 10:30 am

Anton Petrov's latest update tube that gathers recent observations and thoughts...

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