Dust around AFGL 2688, molecular shielding, and the production of carbon chain molecules

Details Dust around AFGL 2688, molecular shielding, and the production of carbon chain molecules Dust around AFGL 2688, molecular shielding, and the production of carbon chain molecules

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..222j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 222-229. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

55

Carbon Stars, Cosmic Dust, Planetary Nebulae, Stellar Envelopes, Stellar Evolution, Asymptotic Giant Branch Stars, Interstellar Chemistry, Photodissociation, Stellar Mass Ejection

Scientific paper

The molecular, IR, and optical maps of the evolved carbon star AFGL 2688 (the 'Egg' Nebula) are all consistent with a model of a bipolar outflow of approximately 0.0001 solar masses/yr that stopped as this object evolved beyond the asymptotic giant branch about 200 years ago. In order to explain the extended HC7N emission around this star, it is proposed that carbon grains are collisionally fragmented as they supersonically steam through the circumstellar envelope.

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