X Sagittarii
(Sprache: Englisch)
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...
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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 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.
Bibliographische Angaben
- 2010, 168 Seiten, Kartoniert (TB), Englisch
- Herausgegeben von Surhone, Lambert M.; Tennoe, Mariam T.; Henssonow, Susan F.
- Verlag: Betascript Publishing
- ISBN-10: 6131435650
- ISBN-13: 9786131435652
Sprache:
Englisch
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