Neutral Carbon in the Protoplanetary Nebulae CRL 618 and CRL 2688 | Zendy

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Neutral Carbon in the Protoplanetary Nebulae CRL 618 and CRL 2688

Author(s) -

Ken Young

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310926

Subject(s) - asymptotic giant branch , astrophysics , physics , carbon fibers , line (geometry) , astronomy , stars , materials science , geometry , mathematics , composite number , composite material

The 609u 3P1 -> 3P0 line of neutral atomic carbon has been detected in theprotoplanetary nebulae CRL 618 and CRL 2688. CI appears to be about 7% asabundant as CO in CRL 2688, and 70% as abundant as CO in CRL 618. CI emissionarises primarily from the slow component of the wind from these objects. Thedata presented here indicate that CI gradually becomes more abundant as thestar leaves the AGB, and CI is significantly enhanced relative to CO before thestar develops a large HII region.Comment: 7 pages, LaTex AASTeX macros. To appear in ApJ Letter

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