When you look up in the night sky and find your way to the North Star, you are looking at Polaris. Not only is it the brightest star in the Ursa Minor constellation (the Little Dipper), but its ...

This Hubble Space Telescope image shows RS Puppis, one of the most luminous Cepheid variable stars. It rhythmically brightens and dims over a six-week cycle. (ASA, ESA, Hubble Heritage Team ...

Cepheid variable stars are a vital rung on the “ladder” astronomers use to determine the distance to astronomical objects. These pulsating stars, which change in brightness as they also change in ...

Publications of the Astronomical Society of the Pacific, Vol. 119, No. 854 (April 2007), pp. 398-406 (9 pages) ABSTRACT We introduce a simple method for determining pulsation velocities of Cepheid ...

“Classical Cepheids” are a type of pulsating star that rhythmically brightens and dims over time. These pulsations help astronomers measure vast distances across space, which makes Cepheids crucial ...

THE oscillations induced in the principal modes of vibration of a star by a free oscillation in one of them, generally of the second order in the corresponding free amplitude, are unimportant unless ...

Studying pulsing Cepheid stars offers a cosmic yardstick by which to measure the universe. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Hubble proved Andromeda is a separate galaxy by identifying a Cepheid variable star within it. Cepheid variables have a period-luminosity relationship: longer period means greater brightness. Knowing ...

THE most important objection raised against the pulsation theory of Cepheid variation lies in its failure to explain the observed phase relation between temperature and radial velocity. In a pulsating ...