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- PG_1159_star abstract "A PG 1159 star, often also called a pre-degenerate, is a star with a hydrogen-deficient atmosphere that is in transition between being the central star of a planetary nebula and being a hot white dwarf. These stars are hot, with surface temperatures between 75,000 K and 200,000 K, and are characterized by atmospheres with little hydrogen and absorption lines for helium, carbon and oxygen. Their surface gravity is typically between 104 and 106 meters per second squared. Some PG 1159 stars are still fusing helium., § 2.1.1, 2.1.2, Table 2. The PG 1159 stars are named after their prototype, PG 1159-035. This star, found in the Palomar-Green survey of ultraviolet-excess stellar objects, was the first PG 1159 star discovered. It is thought that the atmospheric composition of PG 1159 stars is odd because, after they have left the asymptotic giant branch, they have reignited helium fusion. As a result, a PG 1159 star's atmosphere is a mixture of material which was between the hydrogen- and helium-burning shells of its AGB star progenitor., §1. They are believed to eventually lose mass, cool, and become DO white dwarfs.; , §4.Some PG 1159 stars have varying luminosities. These stars vary slightly (5–10%) in brightness due to non-radial gravity wave pulsations within themselves. They vibrate in a number of modes simultaneously, with typical periods between 300 and 3,000 seconds., Table 1. The first known star of this type is also PG 1159-035, which was found to be variable in 1979, and was given the variable star designation GW Vir in 1985. These stars are called GW Vir stars, after their prototype, or the class may be split into DOV and PNNV stars., § 1.1;".
- PG_1159_star wikiPageID "11726394".
- PG_1159_star wikiPageRevisionID "588544137".
- PG_1159_star hasPhotoCollection PG_1159_star.
- PG_1159_star subject Category:Star_types.
- PG_1159_star subject Category:White_dwarfs.
- PG_1159_star comment "A PG 1159 star, often also called a pre-degenerate, is a star with a hydrogen-deficient atmosphere that is in transition between being the central star of a planetary nebula and being a hot white dwarf. These stars are hot, with surface temperatures between 75,000 K and 200,000 K, and are characterized by atmospheres with little hydrogen and absorption lines for helium, carbon and oxygen. Their surface gravity is typically between 104 and 106 meters per second squared.".
- PG_1159_star label "Estrela PG 1159".
- PG_1159_star label "PG 1159 star".
- PG_1159_star label "PG 1159星".
- PG_1159_star label "PG1159-Stern".
- PG_1159_star label "PG1159星".
- PG_1159_star label "Stella pre-degenere".
- PG_1159_star label "Étoile PG 1159".
- PG_1159_star sameAs PG1159-Stern.
- PG_1159_star sameAs Étoile_PG_1159.
- PG_1159_star sameAs Stella_pre-degenere.
- PG_1159_star sameAs PG1159星.
- PG_1159_star sameAs Estrela_PG_1159.
- PG_1159_star sameAs m.02rq6yb.
- PG_1159_star sameAs Q787067.
- PG_1159_star sameAs Q787067.
- PG_1159_star wasDerivedFrom PG_1159_star?oldid=588544137.
- PG_1159_star isPrimaryTopicOf PG_1159_star.