Onekilopars QnA
How do astronomers know the distance to Cepheid variables quizlet?
How do astronomers know the distances to Cepheid variables? By measuring the period of the variable star, we can determine its luminosity. Then, by measuring its apparent brightness, we can use the inverse-square law of light to get its distance.
What are the three main types of galaxies?
Types of Galaxies Astronomers classify galaxies into three major categories: elliptical, spiral and irregular. Why Betelgeuse is a variable star? A pulsating semiregular variable star, Betelgeuse is subject to multiple cycles of increasing and decreasing brightness due to changes in its size and temperature.
Also, what are examples of variable stars?
The Cepheids and RR Lyrae stars are typical examples of such variables. The explosive (or eruptive) variables include novas, supernovas, and similar stars that undergo sudden outbursts of radiant energy, which results in rapid brightening. Then, who discovered variable star? Leavitt Leavitt discovered 2,400 variable stars, about half of the known total in her day. Through these discoveries came her most important contribution to the field: the study of cepheid variable stars in the Magellenic Clouds -- the Milky Way's two companion galaxies.
Are Cepheid variable stars main sequence stars?
Because of these properties, one can determine a distance to a Cepheid variable by measuring its period and its apparent brightness. Cepheid variables are not main sequence stars. Rather, they are stars that are in the helium burning stage of their lives. What gases are in a nebula? Nebulae are made of dust and gases-mostly hydrogen and helium. The dust and gases in a nebula are very spread out, but gravity can slowly begin to pull together clumps of dust and gas.
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