... Henrietta Leavitt uncovered a relation between the intrinsic brightness and the pulsation period of Cepheid variable stars and showed that intrinsically brighter Cepheids have longer periods. ...
... The ESA/ESO Astronomy Exercises . Figure 4: Cepheid light curves . ... Light curves for the twelve Cepheid variables in M100 that have been observed with ... The absolute magnitude, M, is determined from the period of the Cepheids. ...
... The ESA/ESO Astronomy Exercises . Figure 4a: Cepheid light curves . ... Light curves for the twelve Cepheid variables in M100 that have been observed with ... The absolute magnitude, M, is determined from the period of the Cepheids. ...
... astronomers announced that they had discovered Cepheid variable stars in a distant ... universe is expanding, astronomers have used Cepheids as the yardstick of choice for ... Cepheids are one type of variable star . ...
... Exercise 2: The Distance to Messier 100 as Determined by Cepheid Variable Stars", . ... In this exercise we measure the period and apparent magnitudes of Cepheid variables in the galaxy M100. ...
... Mitchell, H. "Henrietta Leavitt and the Cepheid Variables" in The Physics Teacher , Mar. 1976, vol. 14, p. 162. ... 1987, Norton. Chapter 10 concerns Leavitt's work on Cepheids. Richardson, Robert "Henrietta Leavitt" in The Star Lovers . ...