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Cepheid variable
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:Cepheids redirects here. For the fictional species, see "Blind Alley".
RS Puppis as imaged by Hubble (HST)
A Cepheid variable (/'s?fi??d/ or /'si?fi??d/) is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.A strong direct relationship between a Cepheid variable's luminosity and pulsation period secures for Cepheids their status as important distance indicators for establishing the galactic and extragalactic distance scales.The term Cepheid originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784.
^ Udalski, A.; Soszynski, I.; Szymanski, M.; Kubiak, M.; Pietrzynski, G.; Wozniak, P.; Zebrun, K. (1999). "The Optical Gravitational Lensing Experiment. Cepheids in the Magellanic Clouds. IV. Catalog of Cepheids from the Large Magellanic Cloud". Acta Astronomica 49: 223. arXiv:astro-ph/9908317. Bibcode:1999AcA....49..223U.
^ Soszynski, I.; Poleski, R.; Udalski, A.; Szymanski, M. K.; Kubiak, M.; Pietrzynski, G.; Wyrzykowski, L.; Szewczyk, O.; Ulaczyk, K. (2008). "The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. I. Classical Cepheids in the Large Magellanic Cloud". Acta Astronomica 58: 163. arXiv:0808.2210. Bibcode:2008AcA....58..163S.
^ Cite error: The named reference freedman2001 was invoked but never defined (see the help page).
^ Cite error: The named reference tammannsandage2008 was invoked but never defined (see the help page).
^ Cite error: The named reference majaess2009 was invoked but never defined (see the help page).
^ Freedman, Wendy L.; Madore, Barry F. (2010). "The Hubble Constant". Annual Review of Astronomy and Astrophysics 48: 673. arXiv:1004.1856. Bibcode:2010ARA&A..48..673F. doi:10.1146/annurev-astro-082708-101829.
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