Cepheid variable
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Cepheid variable
A Cepheid variable (/ˈsɛfi.ɪd, ˈsiːfi-/) is a type of variable star that pulsates radially, varying in both diameter and temperature. It changes in brightness...
Classical Cepheid variable
Classical Cepheids are a type of Cepheid variable star. They are young, population I variable stars that exhibit regular radial pulsations with periods...
Polaris
Aa/Ab pair only confirmed in the early 20th century. As the closest Cepheid variable, Polaris Aa's distance is a foundational part of the cosmic distance...
Hubble's law
the world's most powerful telescope at the time. His observations of Cepheid variable stars in "spiral nebulae" enabled him to calculate the distances to...
Period-luminosity relation
pulsating variable stars with their pulsation period. The best-known relation is the direct proportionality law holding for Classical Cepheid variables, sometimes...
Delta Scuti variable
A Delta Scuti variable (sometimes termed dwarf cepheid when the V-band amplitude is larger than 0.3 mag.) is a class of pulsating star, comprising several...
Variable star
numerous observations of variable stars, paying particular attention to Cepheid variables. Her analyses and observations of variable stars, carried out with...
Fifth force
rate of pulsation of over a thousand cepheid variable stars in 25 galaxies. Theory suggests that the rate of cepheid pulsation in galaxies screened from...
T Monocerotis
T Monocerotis (T Mon) is a classical Cepheid variable star in the constellation of Monoceros, visually located 2° northwest of Epsilon Monocerotis. Along...
Henrietta Swan Leavitt
relationship she discovered in it, between the period of certain variable stars (Cepheids) and their apparent brightness, reflected a relationship in their...