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- S-type_star abstract "A star with spectral type S is a late-type giant star (similar to class K5–M) whose spectrum displays bands from zirconium oxide, in addition to the titanium oxide bands characteristically exhibited by K and M class giant stars. Other s-process elements, for example yttrium oxide and technetium, are also enhanced, clearly indicating neutron capture elements in period 5 in the periodic system of chemical elements. An S star may also have spectrographic features from cyanogen and lithium. Most of these stars are long-period variables. The class was first defined by astronomer Paul W. Merrill in 1922.It has been proposed that most S stars are an intermediate stage in which asymptotic giant stars (AGB stars) transform from ordinary M class giants to carbon stars of class C-N. AGB stars are usually powered by fusion in a shell of hydrogen surrounding an inert core, but during "thermal pulses" helium shell fusion can come to dominate. Other S stars ("extrinsic" S stars) may be evolved, cooler versions of barium stars, where the enhancements of carbon and s-process elements seen in the stars' spectra are relics of mass transfer between members of a binary star system. In these systems, the presently-observed S star has not synthesized the excess carbon and s-process elements itself; that material was produced at an earlier time by its binary companion, which was at the time a carbon star. We are observing these systems long after the mass transfer event, when the companion has evolved to become a white dwarf and is usually not directly visible.S-type stars are generally redder than their K- or M-type counterparts of the same photospheric temperature. The mira variable Chi Cygni is (when near maximum light) the sky's brightest S-type star, with a variable late type spectrum about S7 to S10, with features of zirconium, titanium and vanadium oxides, sometimes bordering to the intermediary MS type. S Ursae Majoris is another example. BD Camelopardalis is an example of an "extrinsic" S star.".
- S-type_star wikiPageExternalLink stellar%20spectra.
- S-type_star wikiPageExternalLink S-type-star.
- S-type_star wikiPageID "19194676".
- S-type_star wikiPageLength "3578".
- S-type_star wikiPageOutDegree "31".
- S-type_star wikiPageRevisionID "650172646".
- S-type_star wikiPageWikiLink Asymptotic_giant_branch.
- S-type_star wikiPageWikiLink BD_Camelopardalis.
- S-type_star wikiPageWikiLink Barium_star.
- S-type_star wikiPageWikiLink Binary_star.
- S-type_star wikiPageWikiLink Carbon_star.
- S-type_star wikiPageWikiLink Category:S-type_stars.
- S-type_star wikiPageWikiLink Category:Star_types.
- S-type_star wikiPageWikiLink Chemical_element.
- S-type_star wikiPageWikiLink Chi_Cygni.
- S-type_star wikiPageWikiLink Cyanogen.
- S-type_star wikiPageWikiLink Giant_star.
- S-type_star wikiPageWikiLink Lithium.
- S-type_star wikiPageWikiLink Long-period_variable_star.
- S-type_star wikiPageWikiLink Long-period_variables.
- S-type_star wikiPageWikiLink Mira_variable.
- S-type_star wikiPageWikiLink Paul_W._Merrill.
- S-type_star wikiPageWikiLink Period_5_element.
- S-type_star wikiPageWikiLink Periodic_system.
- S-type_star wikiPageWikiLink Periodic_table.
- S-type_star wikiPageWikiLink Photosphere.
- S-type_star wikiPageWikiLink S-process.
- S-type_star wikiPageWikiLink S_Ursae_Majoris.
- S-type_star wikiPageWikiLink Stellar_classification.
- S-type_star wikiPageWikiLink Technetium.
- S-type_star wikiPageWikiLink Technetium_star.
- S-type_star wikiPageWikiLink Titanium_oxide.
- S-type_star wikiPageWikiLink White_dwarf.
- S-type_star wikiPageWikiLink Yttrium(III)_oxide.
- S-type_star wikiPageWikiLink Yttrium_oxide.
- S-type_star wikiPageWikiLink Zirconium_dioxide.
- S-type_star wikiPageWikiLink Zirconium_oxide.
- S-type_star wikiPageWikiLinkText "S Stars".
- S-type_star wikiPageWikiLinkText "S star".
- S-type_star wikiPageWikiLinkText "S stars".
- S-type_star wikiPageWikiLinkText "S".
- S-type_star wikiPageWikiLinkText "S-type star".
- S-type_star wikiPageWikiLinkText "S-type".
- S-type_star hasPhotoCollection S-type_star.
- S-type_star wikiPageUsesTemplate Template:Reflist.
- S-type_star wikiPageUsesTemplate Template:Star.
- S-type_star subject Category:S-type_stars.
- S-type_star subject Category:Star_types.
- S-type_star hypernym Star.
- S-type_star type Star.
- S-type_star type Concept.
- S-type_star comment "A star with spectral type S is a late-type giant star (similar to class K5–M) whose spectrum displays bands from zirconium oxide, in addition to the titanium oxide bands characteristically exhibited by K and M class giant stars. Other s-process elements, for example yttrium oxide and technetium, are also enhanced, clearly indicating neutron capture elements in period 5 in the periodic system of chemical elements. An S star may also have spectrographic features from cyanogen and lithium.".
- S-type_star label "S-type star".
- S-type_star sameAs Estel_de_tipus_S.
- S-type_star sameAs S-hvězdy.
- S-type_star sameAs Estrella_de_tipo_S.
- S-type_star sameAs Étoile_de_type_S.
- S-type_star sameAs Stella_di_classe_S.
- S-type_star sameAs S型星.
- S-type_star sameAs S형_별.
- S-type_star sameAs Gwiazdy_typu_widmowego_S.
- S-type_star sameAs Estrela_do_tipo_S.
- S-type_star sameAs m.04ldwlv.
- S-type_star sameAs Звезда_S-типа.
- S-type_star sameAs Hviezda_typu_S.
- S-type_star sameAs Зорі_спектрального_класу_S.
- S-type_star sameAs Q1153392.
- S-type_star sameAs Q1153392.
- S-type_star sameAs S-型星.
- S-type_star wasDerivedFrom S-type_star?oldid=650172646.
- S-type_star isPrimaryTopicOf S-type_star.