# Varibles/Eclipsing Binary systems

• Cyclotron
In summary, variables or eclipsing binary systems are a type of binary star system where the two stars revolve around each other, causing periodic changes in brightness as they pass in front of each other. This phenomenon can provide valuable information about the stars' properties, such as their size, mass, and temperature. Eclipsing binaries are also used as standard candles for measuring distances in the universe. The study of these systems has led to many discoveries and advancements in our understanding of stellar evolution and the characteristics of stars.
Cyclotron
Hey,

What are the most common eclipsing binary stars and variable stars to observe with periods of a few hours?

Im observing from Ireland.

Thanks

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Cyclotron said:
Hey,

What are the most common eclipsing binary stars and variable stars to observe with periods of a few hours?

Im observing from Ireland.

Thanks
Some should be listed http://www.astro.uiuc.edu/~kaler/sow/class.html#variable" , or various links from the top of the page.

Last edited by a moderator:
Thanks for the link. But I cannot seem to find any variable stars with periods of only a few hours. I need to find some in the northern hemisphere so I can make real time photometric measurements.

## 1. What are variables in eclipsing binary systems?

In eclipsing binary systems, variables are stars that appear to change in brightness due to their orbiting companion star passing in front of them. This causes a periodic dimming of the variable star's light, which can be measured and studied.

## 2. How are eclipsing binary systems formed?

Eclipsing binary systems are formed when two stars are in a close orbit around each other, with their orbital plane aligned with our line of sight. This allows for one star to periodically pass in front of the other, creating the observed changes in brightness.

## 3. What can we learn from studying eclipsing binary systems?

By studying eclipsing binary systems, scientists can determine the sizes, masses, and temperatures of the stars involved. This can also provide insights into the evolution and lifecycles of stars.

## 4. How are eclipsing binary systems used in cosmology?

Eclipsing binary systems can be used as standard candles to measure distances in the universe. By comparing the observed brightness of these systems to their known properties, scientists can calculate their distance and use this information to measure distances to other objects in the universe.

## 5. Are eclipsing binary systems rare?

Eclipsing binary systems are not rare, as they are estimated to make up about 40% of all known binary star systems. However, they may be more difficult to detect and study due to their periodic and often subtle changes in brightness.

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