Carbon isotope ratios along the giant branch of M67
The carbon isotope ratio in the giant branch stars of the open cluster M67 was studied in order to determine at what stage in the evolutionary sequence a star departs from standard evolution and undergoes excess surface mixing that has been observed in low-mass stars. The results show that the subgi...
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| Veröffentlicht in: | The Astrophysical journal 1991-04, Vol.371 (2), p.578-583 |
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| container_title | The Astrophysical journal |
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| creator | GILROY, K. K BROWN, J. A |
| description | The carbon isotope ratio in the giant branch stars of the open cluster M67 was studied in order to determine at what stage in the evolutionary sequence a star departs from standard evolution and undergoes excess surface mixing that has been observed in low-mass stars. The results show that the subgiants seem to have undergone little or no mixing. The lower giant branch stars exhibit normal 'fist dredge-up' mixing ratios. The 'tip' giants and the 'clump' giants exhibit ratios considerably lower than predicted by standard mixing theories. Mixing on the giant branch caused by meridional circulation currents due to stellar rotation could have caused additional CN-processed elements to be mixed to the surface. This mixing would have occurred after the standard mixing phase and before the He-core flash. 29 refs. |
| doi_str_mv | 10.1086/169922 |
| format | Article |
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This mixing would have occurred after the standard mixing phase and before the He-core flash. 29 refs.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.1086/169922</identifier><identifier>CODEN: ASJOAB</identifier><language>eng</language><publisher>Chicago, IL: University of Chicago Press</publisher><subject>640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ; ABUNDANCE ; Astronomy ; ATMOSPHERES ; CARBON ISOTOPES ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; Earth, ocean, space ; ELEMENT ABUNDANCE ; Exact sciences and technology ; GIANT STARS ; Globular clusters in the milky way ; ISOTOPES ; MIXING ; RED GIANT STARS ; SPECTRA ; STAR CLUSTERS ; STAR EVOLUTION ; STARS ; STELLAR ATMOSPHERES ; Stellar clusters and associations ; Stellar systems. Galactic and extragalactic objects and systems. 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A</creatorcontrib><title>Carbon isotope ratios along the giant branch of M67</title><title>The Astrophysical journal</title><description>The carbon isotope ratio in the giant branch stars of the open cluster M67 was studied in order to determine at what stage in the evolutionary sequence a star departs from standard evolution and undergoes excess surface mixing that has been observed in low-mass stars. The results show that the subgiants seem to have undergone little or no mixing. The lower giant branch stars exhibit normal 'fist dredge-up' mixing ratios. The 'tip' giants and the 'clump' giants exhibit ratios considerably lower than predicted by standard mixing theories. Mixing on the giant branch caused by meridional circulation currents due to stellar rotation could have caused additional CN-processed elements to be mixed to the surface. This mixing would have occurred after the standard mixing phase and before the He-core flash. 29 refs.</description><subject>640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources</subject><subject>ABUNDANCE</subject><subject>Astronomy</subject><subject>ATMOSPHERES</subject><subject>CARBON ISOTOPES</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>Earth, ocean, space</subject><subject>ELEMENT ABUNDANCE</subject><subject>Exact sciences and technology</subject><subject>GIANT STARS</subject><subject>Globular clusters in the milky way</subject><subject>ISOTOPES</subject><subject>MIXING</subject><subject>RED GIANT STARS</subject><subject>SPECTRA</subject><subject>STAR CLUSTERS</subject><subject>STAR EVOLUTION</subject><subject>STARS</subject><subject>STELLAR ATMOSPHERES</subject><subject>Stellar clusters and associations</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c376t-38582c3c571c74c4905f2cefc90a8962c87ed2124aab582ae02c9536c388e1653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources</topic><topic>ABUNDANCE</topic><topic>Astronomy</topic><topic>ATMOSPHERES</topic><topic>CARBON ISOTOPES</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>Earth, ocean, space</topic><topic>ELEMENT ABUNDANCE</topic><topic>Exact sciences and technology</topic><topic>GIANT STARS</topic><topic>Globular clusters in the milky way</topic><topic>ISOTOPES</topic><topic>MIXING</topic><topic>RED GIANT STARS</topic><topic>SPECTRA</topic><topic>STAR CLUSTERS</topic><topic>STAR EVOLUTION</topic><topic>STARS</topic><topic>STELLAR ATMOSPHERES</topic><topic>Stellar clusters and associations</topic><topic>Stellar systems. Galactic and extragalactic objects and systems. The universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>GILROY, K. K</creatorcontrib><creatorcontrib>BROWN, J. A</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>GILROY, K. K</au><au>BROWN, J. A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Carbon isotope ratios along the giant branch of M67</atitle><jtitle>The Astrophysical journal</jtitle><date>1991-04-01</date><risdate>1991</risdate><volume>371</volume><issue>2</issue><spage>578</spage><epage>583</epage><pages>578-583</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>The carbon isotope ratio in the giant branch stars of the open cluster M67 was studied in order to determine at what stage in the evolutionary sequence a star departs from standard evolution and undergoes excess surface mixing that has been observed in low-mass stars. The results show that the subgiants seem to have undergone little or no mixing. The lower giant branch stars exhibit normal 'fist dredge-up' mixing ratios. The 'tip' giants and the 'clump' giants exhibit ratios considerably lower than predicted by standard mixing theories. Mixing on the giant branch caused by meridional circulation currents due to stellar rotation could have caused additional CN-processed elements to be mixed to the surface. This mixing would have occurred after the standard mixing phase and before the He-core flash. 29 refs.</abstract><cop>Chicago, IL</cop><pub>University of Chicago Press</pub><doi>10.1086/169922</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | The Astrophysical journal, 1991-04, Vol.371 (2), p.578-583 |
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| language | eng |
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| subjects | 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ABUNDANCE Astronomy ATMOSPHERES CARBON ISOTOPES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Earth, ocean, space ELEMENT ABUNDANCE Exact sciences and technology GIANT STARS Globular clusters in the milky way ISOTOPES MIXING RED GIANT STARS SPECTRA STAR CLUSTERS STAR EVOLUTION STARS STELLAR ATMOSPHERES Stellar clusters and associations Stellar systems. Galactic and extragalactic objects and systems. The universe |
| title | Carbon isotope ratios along the giant branch of M67 |
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