All Questions
Tagged with red-dwarf brown-dwarf
9 questions
2
votes
0
answers
47
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How much of the hydrogen in our sun will never participate in fusion? What about larger stars? [duplicate]
From what I gather, only red dwarf stars are fully convective, and will use up pretty much all of their hydrogen....
Is there a chart or list somewhere that shows the percentage of hydrogen that is ...
- 5,585
18
votes
1
answer
3k
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How can a brown dwarf be more massive than a star?
SDSS J0104+1535 is about 90 times more massive than Jupiter, making it the heaviest known brown dwarf. EBLM J0555-57Ab has a mass of about 85.2±4 Jupiter masses, or 0.081 Solar masses.
I am confused. ...
- 2,939
12
votes
3
answers
746
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Existence of planets larger than their host star?
The mass region of objects between ~ 0.5 Jupiter masses and 80 Jupiter masses (gas giants through to brown dwarfs and red dwarfs) is typified by an almost flat relationship with object diameter. There ...
- 103
4
votes
1
answer
76
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At what point does an astronomical body's surface stop being gas giant-like and start being sun-like?
I've generally seen brown dwarfs depicted as more massive and slightly wider Jupiters in varying colors with banded cloud structures, sometimes hot enough to be visible glowing. I've also seen red ...
- 129k
13
votes
3
answers
2k
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Are Brown and Sub-Brown Dwarfs secretly more common than stars?
I recently heard that Red Dwarfs are the most common type of star, and low-mass Red Dwarfs are the most common type of Red Dwarf. This seems to imply a generic trend that the lower the mass, the more ...
- 4,553
0
votes
1
answer
593
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If the Earth circled a red dwarf/giant or a brown dwarf, would its sky still look blue? [duplicate]
I have the impression that in brown dwarf and weak red dwarf systems, everything looks more reddish on a planet, including its atmosphere regardless of composition. Suppose there's a planet having an ...
- 30.7k
5
votes
1
answer
745
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How do we know that 2MASS J0523-1403 is a red dwarf?
I was reading about red dwarfs, and stumbled upon this article about the least massive red dwarf, and noticed several peculiarities:
The spectral type is L2.5
The luminosity class is V
The mass is 67....
- 162k
7
votes
1
answer
764
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Is the mechanism of solar flares on red dwarfs and brown dwarfs the same as that on the Sun?
The Sun has solar flares that are caused when there is a magnetic reconnection in the Sun's atmosphere, causing a loop of magnetic field to be ejected at high energy, along with a large number of ...
CommunityBot
- 1
2
votes
2
answers
899
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How do I understand a brown dwarf with a M-type spectrum?
There are a large fraction of M dwarfs which are claimed to be brown dwarfs.
Why do we still use M-type and not create a new stellar type like L, T and Y? The main signature of M is TiO absorption ...
- 162k