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Results tagged with star
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user 31410
Questions regarding large spheres of plasma undergoing fusion.
3
votes
1
answer
163
views
Is a trefoil orbit around a trinary star valid?
While looking for interesting orbits of a spacecraft in a trinary star, I found an type of quasi-orbit called of a trefoil, as shown in this clip. …
- 6,733
4
votes
Accepted
If Proxima Centauri goes supernova will it negatively affect the Earth?
First thing, Proxima Centauri cannot go supernova. It is only $0.12 M_\odot$, while core-collapse supernovae can only be triggered by stars that are more massive than $8 M_\odot$. Now the only excepti …
- 6,733
3
votes
2
answers
3k
views
Is there a formula for absolute magnitude that does not contain an apparent magnitude term?
I have a star that I need to calculate the absolute magnitude of. I am given the temperature, luminosity, radius, mass, and distance in light-years. …
- 6,733
5
votes
2
answers
2k
views
What is the distance from Alpha Centauri to Barnard's Star?
Alpha Centauri AB is the closest star system to Earth (4.366 ly), followed closely by Barnard's star (5.988 ly). The closest star system to Alpha Centauri is Luhman 16 (3.8 ly from α Cen). … So I am wondering, what is the distance from α Centauri AB to Barnard's star, and more generally, from one star to a different one (all below 10 pc)? …
- 6,733
5
votes
1
answer
2k
views
What is the length of time for each fusion process in a massive star?
In a massive star (i.e. an O5 star), first hydrogen is fused into helium, then helium is fused into carbon. This process continues to neon, oxygen, and finally silicon burning. …
- 6,733
4
votes
1
answer
586
views
Are the sub-spectral types (1,...9) based on temperature or spectral lines?
According to Wikipedia, (sample shown below), the lower the number, the hotter and more massive the star, but absorption lines are not included. …
- 6,733
-3
votes
1
answer
1k
views
Which star has the lowest absolute magnitude?
So I'm wondering, which star has the lowest absolute magnitude (in other words, which star is the brightest when a viewer is 10 pc away)? …
- 6,733
3
votes
1
answer
132
views
What does the "a" at the end of a spectral type mean?
This seems to be an error, as the star Vega has spectral type A0Va, with the a definitely being a peculiarity. What does the a in spectral types mean, and is this actually a spectral peculiarity? …
- 6,733
3
votes
1
answer
325
views
What is the coolest white dwarf known?
Okay, so in this ArXiv report from 2014, scientists discovered the coolest white dwarf, with a temperature of below 3000 K. However, as this report was from over 6 years ago, I think this information …
- 6,733
1
vote
Accepted
Could a star become a planet?
Contrarily, a planet (brown dwarf) can become a star if it accretes enough mass. … While it accretes more material, fusion ignites in its core and it becomes a star. …
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2
votes
Grammar of stellar classification
Basically, any star's classification would be written as 'Temperature class'+'Digit'+'Star type.' …
- 6,733
0
votes
1
answer
95
views
When a fast-moving star goes supernova, how will the resulting remnant evolve?
Let's take a massive star that has zero velocity. When this star goes supernova, the resulting supernova remnant will expand in a sphere. But, let's take a runaway star travelling at 200 km/s. … My reasoning is that the material ejected "forwards" relative to the star's velocity vector will gain some velocity, leaving the dead star behind. …
- 6,733
5
votes
3
answers
1k
views
Were there any images of Sanduleak -69 202 (progenitor of SN1987A) before it exploded?
Were there any images of this star before it exploded, and how did we know that this was the star that produced said supernova? …
- 6,733
5
votes
1
answer
283
views
Why is it that lithium and deuterium are burned before hydrogen?
Protium ($^1H$) has a nuclear binding energy near 0. Meanwhile, lithium and deuterium have higher binding energies. Why is it that they are burned first (or at lower temperatures)? Is it perhaps relat …
- 6,733
1
vote
1
answer
265
views
Blackbody curve in RGB for objects less than 1500 K?
We know the colors of stars that have a temperature greater than 1000-1500 K, shown here. However, I am wondering about those stars/brown dwarfs with surface temperatures of less than 1500 K. Is there …
- 6,733