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What important measurement did RR Lyrae variables allow astronomers to get?

RR Lyrae's brightness (between 7th and 8th magnitude) made it bright enough to observe spectroscopically in such a way that the changes in its spectrum could be traced throughout its cycle of variability. This enabled astronomers to measure changes in spectral type, as well as to detect the presence of emission lines.

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What important discoveries were made in the early century by using RR Lyrae variables?

The telescope sizes range from 6 to 10 inches. They are much larger and less expensive than telescopes.

Why are RR Lyrae variables not used to find distances to distant galaxies?

Why are RR-Lyrae variables not used to find distances to distant galaxies? They are not bright enough to be seen at large distances. Type Ia supernovae are frequently used as standard candles for the measurement of distances to galaxies, but they are not all equally luminous. What are the two types of variables? Experiments require two main types of variables, namely the independent variable and the dependent variable. The independent variable is the variable that is manipulated and is assumed to have a direct effect on the dependent variable, the variable being measured and tested. Experiments even have controlled variables.

Keeping this in consideration, are variable stars on the main sequence?

At a fundamental level all stars are variable as they evolve and change over time (from a main sequence to a red giant star as in the Sun's case for example). Furthermore we can infer that all stars are likely to vary their light output to some extent due to variations caused by phenomena such as sunspots. Are variable stars necessarily on the main sequence? Above the main sequence, the vast majority of stars in the instability strip are variable. Where the instability strip intersects the main sequence, the vast majority of stars are stable, but there are some variables, including the roAp stars.

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Why do astronomers rarely use degrees as measurement?

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People also ask what is the difference between the apparent magnitude and absolute magnitude of stars quizlet?

What is the difference between apparent and absolute magnitude? Apparent magnitude is how bright a star appears from Earth and depends on brightness and distance to a star. Absolute magnitude is how bright a star would appear from a standard distance. One may also ask what is the difference between apparent brightness and absolute brightness quizlet? what is the difference between apparent brightness and absolute brightness? apparent brightness is the light seen from earth and absolute brightness is the light that would be seen at a standard distance from earth.

By Schoof Tabor

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