Classified as a Cepheid variable
, it is a supergiant star about 500 to 800 light-years from Earth.
Oscillations occur not only in mechanical systems but also in dynamic systems in virtually every area of science: for example the beating human heart, business cycles in economics, predator-prey population cycles in ecology, geothermal geysers in geology, vibrating strings in musical instruments, periodic firing of nerve cells in the brain, and the periodic swelling of Cepheid variable
stars in astronomy.
This ladder's "bottom rung" is built on measurements to Cepheid variable
stars that, because of their known brightness, have been used for more than a century to gauge the size of the observable universe.
This is important because Polaris A is a Cepheid variable
Quantifying the shapes of Cepheid variable
star light curves is a technique that has been in use for the past several decades.
Since the launch of NASA's Hubble Space Telescope in 1990, the team has observed 18 galaxies up to 65 million light years away and discovered almost 800 Cepheid variable
stars, a special class of pulsating star used for accurate distance measurement.
We do not have an orbiting observatory that can examine Cepheid variable
stars to determine the distance scale of the universe.
Astronomers want to determine the mass of Polaris, because it is the nearest Cepheid variable
We present analysis of two double model Cepheid variable
stars, BQ Serpens and VX Puppis.
Caption: Astronomers measure distance to faraway galaxies--a key to the Hubble constant--by recording the brightness of supernovas and Cepheid variable
It is one of the most luminous in the class of so-called Cepheid variable
This portion of the electromagnetic spectrum has numerous advantages, especially when observing Cepheid variable
stars, the so-called "standard candles" that are used to determine distances to distant galaxies.