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Cepheid variable stars have masses between five and twenty times the mass of our Sun. The more massive stars are more luminous and have more extended envelopes (the outer layers of gas in a star are sometimes called its "envelope").
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imagine.gsfc.nasa.gov/docs/science/mysteries_l1/cepheid...
imagine.gsfc.nasa.gov/docs/science/mysteries_l1/cepheid.html
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The periods of Cepheids are not related to their distances. The are linked with the true brightness (and hence called the Period-Luminosity relationship). We can easily measure the apparent brightness and the period of the pulsation of a Cepheid variable. ... Imagine Home | Ask an Astrophysicist | Cepheid Variable Stars...
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imagine.gsfc.nasa.gov/docs/ask_astro/answers/980425c.ht...
imagine.gsfc.nasa.gov/docs/ask_astro/answers/980425c.html
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Cepheid variable stars as distance indicators. ... From the shape of the ``light curve'' of a Cepheid variable star, one can tell that it is a Cepheid variable. The period is simple to measure, as is the apparent brightness at maximum brightness...
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zebu.uoregon.edu/~soper/MilkyWay/cepheid.html
zebu.uoregon.edu/~soper/MilkyWay/cepheid.html
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Cepheid variable stars have proved to be one of the most valuable methods for distance determination because their period of variability has been shown to be related to their absolute luminosity by a period-luminosity relationship.
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hyperphysics.phy-astr.gsu.edu/HBASE/Astro/cepheid.html
hyperphysics.phy-astr.gsu.edu/HBASE/Astro/cepheid.html
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Cepheid variable stars & distance determination for astrophysics option of NSW HSC Physics Stage 6 course. ... Cepheid Variable Stars & Distance Determination...
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outreach.atnf.csiro.au/education/senior/astrophysics/va...
outreach.atnf.csiro.au/education/senior/astrophysics/variable_cepheids.html
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What she determined was that the brighter the Cepheid, the longer its period. In fact, Cepheids are very special variable stars because their period (the time they take to brighten, dim and brighten again) is...
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starchild.gsfc.nasa.gov/docs/StarChild/shadow/cepheids....
starchild.gsfc.nasa.gov/docs/StarChild/shadow/cepheids.html
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A Cepheid variable is a young star of several solar masses and roughly 104 solar luminosities whose luminosity changes periodically. ... Type I Cepheids are population I stars which have brightnesses which fluctuate with a period between 1 to 100 days. W Virginis stars are sometimes called type II Cepheid variables.
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scienceworld.wolfram.com/astronomy/CepheidVariable.html
scienceworld.wolfram.com/astronomy/CepheidVariable.html
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Astronomy glossary explains basic astronomical terms, C. ... ; CEPHEID VARIABLE STAR ... Cepheid variables are supergiant stars that regularly pulsate in size and change in brightness. As the star increases in size, its brightness decreases; then, the reverse occurs. The luminosity is proportional to the period.
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www.enchantedlearning.com/subjects/astronomy/glossary/i...
www.enchantedlearning.com/subjects/astronomy/glossary/indexc.shtml
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Cepheid variable stars are higher mass stars, mass>5 solar masses, in the class of yellow super giants ( F to G). The brightness variability of cepheids is intrinsic to the stars, and not cause by it being eclipsed by a binary partner.;
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www.calstatela.edu/faculty/kaniol/a360/cepheids.htm
www.calstatela.edu/faculty/kaniol/a360/cepheids.htm
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