What are the three main characteristics used to classify stars?

Characteristics used to classify stars include color, temperature, size, composition, and brightness.

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You can also ask how do astronomers measure the distance of stars?

Astronomers use an effect called parallax to measure distances to nearby stars. Parallax is the apparent displacement of an object because of a change in the observer's point of view. And another question, how do we measure the distance of the star from us using the measurement of their brightness? By comparing the intrinsic brightness to the star's apparent brightness, we can get a good measure of the star's distance by applying the 1/r^2 rule. The 1/r^2 rule states that the apparent brightness of a light source is proportional to the square of its distance.

And another question, what type of star is rr lyrae?

RR Lyrae are variable, horizontal branch stars with periods ranging from a few hours to 2 days, and optical brightnesses that typically vary between 0.3 and 2 magnitudes. They lie in the instability strip of the Hertzsprung-Russell diagram and suffer instabilities that cause their size to periodically change. People also ask what kind of star is rr lyrae? periodic variable stars RR Lyrae variables are periodic variable stars, commonly found in globular clusters. They are used as standard candles to measure (extra) galactic distances, assisting with the cosmic distance ladder. This class is named after the prototype and brightest example, RR Lyrae.

You can also ask what are rr lyrae stars quizlet?

RR Lyrae stars pulsate, but with shorter periods and lower luminosities than Cepheids. The RR Lyrae stars have much shorter periods than Cepheids.