X Sagittarii
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High Quality Content by WIKIPEDIA articles! X Sagittarii is a Cepheid variable star in the constellation Sagittarius. This variable star changes in apparent magnitude from +4.24 to +4.84 with a period of 7.01 days. Its change in brightness is accompanied by a change in spectral classification, from G2 to F5. A Cepheid is a member of a class of pulsating variable stars. The relationship between a Cepheid variable's luminosity and pulsation period is quite precise, securing Cepheids as viable standard candles and the foundation of the Extragalactic Distance Scale. Typical classical Cepheids puls...
High Quality Content by WIKIPEDIA articles! X Sagittarii is a Cepheid variable star in the constellation Sagittarius. This variable star changes in apparent magnitude from +4.24 to +4.84 with a period of 7.01 days. Its change in brightness is accompanied by a change in spectral classification, from G2 to F5. A Cepheid is a member of a class of pulsating variable stars. The relationship between a Cepheid variable's luminosity and pulsation period is quite precise, securing Cepheids as viable standard candles and the foundation of the Extragalactic Distance Scale. Typical classical Cepheids pulsate with periods of a few days to months, and their radii change by several million kilometers (30%) in the process. They are large, luminous stars, of spectral class F6 K2, they are 5 20 times as massive as the Sun and up to 30000 times more luminous.
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