This animation illustrates the pulsation of
a typical Cepheid variable star. This particular Cepheid is 1200 times
a bright as our Sun, and 4 times as massive.
The pulsation cycle repeats itself every 4.2
days.
The radius varies from R = 2.26 to 2.52 x
1012 cm.
Work supported by National Science Foundation.
The temperature changes [T = 4250 to 5380
K] are represented by color variations.
The brightness (or magnitude) changes [~1
mag, a factor of 2.5] are represented by the color saturation ("whiteness").
Cepheid Pulsation