Questions tagged [variable-star]

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1answer
32 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
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1answer
48 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
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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
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1answer
59 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
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1answer
101 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
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1answer
73 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
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1answer
86 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
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2answers
604 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
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1answer
764 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
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1answer
89 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 ...