Reply to topic  [ 378 posts ]  Go to page Previous  1 ... 12, 13, 14, 15, 16
The Astronomy Thread 
Author Message
User avatar

Joined: Sat Mar 05, 2011 6:24 am
Posts: 391
Post Re: The Astronomy Thread
Absalom wrote:
Mjolnir wrote:
As far as I'm aware, the star itself being the cause has been ruled out. A star can only change brightness by changing size (which is far too slow) or by changing temperature (which is too slow and doesn't match spectral observations). A star that rapidly dims without major changes in its spectrum is being blocked by something in front of it.
How would my flare or black hole suggestions compare?


There is a distinct maximum brightness with only minor variations, with irregular but sharply defined dips. Small stars with strong magnetic fields can be highly variable, but it's hard to see how such activity would just intermittently dim the star, and do so by such large amounts. A black hole would cause a very smooth and uniform variation, and a large amount of material orbiting the black hole would form an accretion disk with its own obvious emissions.

It seems pretty certain that this is mundane matter of some form occluding the star, it's just the specific form of that matter that is rather baffling. Too cold for a dust disk, too irregular for planets, far too much of it for it to be comets...


Tue Aug 15, 2017 8:40 pm
Profile

Joined: Fri Sep 23, 2011 9:33 pm
Posts: 665
Post Re: The Astronomy Thread
Mjolnir wrote:
Absalom wrote:
Mjolnir wrote:
As far as I'm aware, the star itself being the cause has been ruled out. A star can only change brightness by changing size (which is far too slow) or by changing temperature (which is too slow and doesn't match spectral observations). A star that rapidly dims without major changes in its spectrum is being blocked by something in front of it.
How would my flare or black hole suggestions compare?


There is a distinct maximum brightness with only minor variations, with irregular but sharply defined dips. Small stars with strong magnetic fields can be highly variable, but it's hard to see how such activity would just intermittently dim the star, and do so by such large amounts. A black hole would cause a very smooth and uniform variation, and a large amount of material orbiting the black hole would form an accretion disk with its own obvious emissions.

It seems pretty certain that this is mundane matter of some form occluding the star, it's just the specific form of that matter that is rather baffling. Too cold for a dust disk, too irregular for planets, far too much of it for it to be comets...
If "far too much" is the best argument against comets, then I'd say the continuum between that and your "orbital snowstorm" is the best contender... at least in this thread. Haven't looked into it elsewhere, after all.


Sat Aug 19, 2017 8:22 pm
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 898
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

In other interesting news. Radio telescopes have detected a repeating Fast Radio Burst source.
Galaxy sends out 15 high energy radio bursts


Wed Aug 30, 2017 6:03 pm
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 378 posts ]  Go to page Previous  1 ... 12, 13, 14, 15, 16

Who is online

Users browsing this forum: Bing [Bot] and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.