Questions tagged [variable-star]
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10
questions
2
votes
1answer
38 views
Astrophysics of Supernovae - Energy over Distance?
I need this for worldbuilding, but it is a physics question. I want to be able calculate the energy over distance from a hypernova of a variable star like Eta Carinae. Understanding what energy levels ...
3
votes
1answer
60 views
Brown dwarf magnetic activity
I have not been able to find an answer to my question through google, and therefore ask it on this medium.
Do brown dwarfs have spots and faculae similar to other heavier stars?
3
votes
0answers
24 views
Large amplitude dipole pulsator
Consider a semiregular variable with amplitude of 1.5 mag. Is it possible to explain brightness variations by purely dipole pulsations?
3
votes
1answer
64 views
What is period doubling in a variable star?
I'm coming across the concept of "period doubling" in RR Lyrae stars. When I look up what period doubling is on the Internet, I find general-level explanations of bifurcations of dynamical systems ...
2
votes
1answer
105 views
Are stars beyond the asteroid belt less constant?
If we graph the variability of a small bright star which is lined up with the asteroid belt, is it less constant than stars that are far away from the asteroid belt? To what degree does variability ...
0
votes
1answer
78 views
Stopping down a telescope to reduce brightness by 5 magnitudes
Suppose we have a variable star with a change in magnitude between maximum and minimum of 5 mag.
How much would you need to stop down a telescope (block some of the area) so that the star at maximum ...
2
votes
1answer
108 views
What leads to increase in opacity in kappa mechanism?
I understand that the kappa mechanism (that leads to star variability) causes an increase of opacity with increasing temperature in partial ionization zones. However, I'm not sure I understand what ...
1
vote
2answers
654 views
Do stars vary their own brightness?
All I could find on the internet was about how stars vary in brightness depending on their distance to Earth, temperature, type of star...
But my question is, can a star can change its brightness.
1
vote
1answer
796 views
How to find a Cepheid's pulsation period using its graph?
Basically, I've been seeing these graphs that say: Cepheid Period-Luminosity Relation and the Period axis is supposed to be "logarithmic";
How does this graph work? Since the luminosity of a star ...
1
vote
1answer
95 views
Variable Types of Stars
I'm trying to decode the Variable Types of stars in the Hipparcos Library. I see there are a number of stars for example :-
EA/AR - Does that mean the star is both a EA(Eclipsing Binary Star) and AR ...
