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Cepheid variable stars – cosmic distance ladder – naap
Cepheid variables are pulsating variable stars similar to the rr lyraes mentioned earlier on the distance modulus page. however, cepheids have longer pulsation periods and they are larger stars.
Cepheid variable | astronomy | britannica.com
Cepheid variable, one of a class of variable stars whose periods (i.e., the time for one cycle) of variation are closely related to their luminosity and that are therefore useful in measuring interstellar and intergalactic distances.
Period-luminosity relation for variable stars
Period-luminosity relation for variable stars chapter index in this window — — chapter index in separate window this material (including images) is copyrighted!.
Science – imagine the universe!
Objects of interest the universe is more than just stars, dust, and empty space. explore some of the objects that make up our universe, from our own sun to distant pulsars and black holes.
Nasa – hubble views the star that changed the universe
› view larger nasa’s hubble space telescope has been trained on a single variable star that in 1923 altered the course of modern astronomy. v1 is a special class of pulsating star called a cepheid variable that can be used to make reliable measurements of large cosmic distances.
Types of variables | aavso.org
After reading this page you may also be interested in our 22 page pdf document detailing all of the variable star types used in vsx. there are two kinds of variable stars: intrinsic, in which variation is due to physical changes in the star or stellar system, and extrinsic, in which variability is due to the eclipse of one star by another or
Hr diagram – university of illinois
The hertzsprung-russell (hr) diagram and its variable stars jim kaler the hr diagram is linked to the natures of the stars and to spectra. return to stars.
Interesting facts about polaris – astronomy trek
A useful gauge of latitude while polaris is seen directly overhead at the north pole, the further south one travels the closer the star drops towards the northern horizon.