Neutral Carbon in Post-Asymptotic Giant Branch Stars and Planetary Nebulae

Details Neutral Carbon in Post-Asymptotic Giant Branch Stars and Planetary Nebulae Neutral Carbon in Post-Asymptotic Giant Branch Stars and Planetary Nebulae

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...585..475h&link_type=abstract

The Astrophysical Journal, Volume 585, Issue 1, pp. 475-481.

Astronomy and Astrophysics

Astronomy

3

Stars: Circumstellar Matter, Planetary Nebulae: Individual (Ngc 6302, Iras 21282+5050), Stars: Agb And Post-Agb

Scientific paper

The 492 GHz (3P1-->3P0) fine-structure line of neutral atomic carbon (C I) has been observed in the planetary nebulae (PNe) NGC 6302, IRAS 21282+5050, and NGC 7027, and in the protoplanetary nebula (PPN) AFGL 2688. The estimated C I/CO abundance ratio is higher for a more evolved object, consistent with a trend that the C I/CO ratio increases with the evolution of a post-asymptotic giant branch system from a PPN to a PN. Nondetections are also reported on 11 PPNe and extreme carbon stars. The upper limits placed on these objects suggest that they have C I abundances lower than the level found in the PPN AFGL 2688, again consistent with an increasing C I/CO ratio with evolution.

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