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- Q726242 subject Q10128303.
- Q726242 subject Q7214315.
- Q726242 subject Q7217185.
- Q726242 subject Q8617308.
- Q726242 abstract "RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances.This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra.RR Lyraes are pulsating horizontal branch stars of spectral class A (and sometimes F), with a mass of around half the Sun's. They are thought to have previously shed mass and consequently, they were once stars with similar or slightly less mass than the Sun, around 0.8 solar masses.RR Lyrae stars pulse in a manner similar to Cepheid variables, so the mechanism for the pulsation is thought to be similar, but the nature and histories of these stars is thought to be rather different.In contrast to classical Cepheids, RR Lyraes are old, relatively low mass, metal-poor "Population II" stars. They are much more common than Cepheids, but also much less luminous. The average absolute magnitude of an RR Lyrae is about 0.75, only 40 or 50 times brighter than our Sun. Their period is shorter, typically less than one day, sometimes ranging down to seven hours. The RR Lyrae subtype RRab (see Subtypes section below) sometimes exhibit the Blazhko effect in which there is a conspicuous phase and amplitude modulation. The prototype RR Lyrae itself exhibits this behavior.The period of pulsation and absolute magnitude of RR Lyraes makes them good standard candles for relatively nearby targets, especially within the Milky Way and Local Group. Beyond the Milky Way they are difficult to detect due to their low luminosity. They are extensively used in globular cluster studies, and also used to study chemical properties of older stars.".
- Q726242 thumbnail HR-diag-instability-strip.svg?width=300.
- Q726242 wikiPageExternalLink vsots_rrlyr.
- Q726242 wikiPageExternalLink ap070415.html.
- Q726242 wikiPageExternalLink details.php?image_id=426.
- Q726242 wikiPageExternalLink RR_Lyr.html.
- Q726242 wikiPageExternalLink animationM15RRLYRAE25-1343.htm.
- Q726242 wikiPageExternalLink m3_variable_stars.html.
- Q726242 wikiPageExternalLink RR_Lyrae_star.html.
- Q726242 wikiPageWikiLink Q10128303.
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- Q726242 wikiPageWikiLink Q6243.
- Q726242 wikiPageWikiLink Q7214315.
- Q726242 wikiPageWikiLink Q7217185.
- Q726242 wikiPageWikiLink Q767805.
- Q726242 wikiPageWikiLink Q8617308.
- Q726242 wikiPageWikiLink Q936076.
- Q726242 comment "RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances.This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra.RR Lyraes are pulsating horizontal branch stars of spectral class A (and sometimes F), with a mass of around half the Sun's.".
- Q726242 label "RR Lyrae variable".
- Q726242 depiction HR-diag-instability-strip.svg.