Matches in DBpedia 2014 for { <http://dbpedia.org/resource/S-type_star> ?p ?o. }
Showing items 1 to 39 of
39
with 100 items per page.
- 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 wikiPageRevisionID "594460964".
- S-type_star hasPhotoCollection S-type_star.
- S-type_star subject Category:S-type_stars.
- S-type_star subject Category:Star_types.
- S-type_star type CelestialBody109239740.
- S-type_star type NaturalObject100019128.
- S-type_star type Object100002684.
- S-type_star type PhysicalEntity100001930.
- S-type_star type S-typeStars.
- S-type_star type Star109444100.
- S-type_star type Whole100003553.
- 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 "Estrela do tipo S".
- S-type_star label "Estrella de tipo S".
- S-type_star label "Gwiazdy typu widmowego S".
- S-type_star label "S-type star".
- S-type_star label "S-型星".
- S-type_star label "Stella di classe S".
- S-type_star label "S型星".
- S-type_star label "Étoile de type S".
- S-type_star label "Звезда S-типа".
- 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 Q1153392.
- S-type_star sameAs Q1153392.
- S-type_star sameAs S-type_star.
- S-type_star wasDerivedFrom S-type_star?oldid=594460964.
- S-type_star isPrimaryTopicOf S-type_star.