Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..685b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 685-693.
Astronomy and Astrophysics
Astrophysics
27
Carbon Monoxide, Carbon Stars, Stellar Envelopes, Stellar Models, Brightness Distribution, Hydrocyanic Acid, Photodissociation
Scientific paper
We have modelled the circumstellar (C-12)O (J = 1 - 0 and J = 2 - 1) emission towards the carbon star S Sct, and conclude that emission from a large geometrically thin shell gives the best fit to the data. A shell which is made up of many individually unresolved clumps of mass about 10 exp -5 solar mass produces a brightness distribution which resembles the observed one much better than a uniform density shell does. It is argued that the cause of the shell is a short period of relatively high mass loss about 10,000 yrs ago. The clumps may have their origin in the mass loss process, and thus our results suggest a mass loss in the form of lumps rather than a smooth wind. The CO lifetime inside the clumps is in accordance with the fact that the shell is still observable. We have detected the (C-13)O (J = 1 - 0) line towards the S Sct shell, and estimated the (C-12)O/)C-13)O abundance ratio to be 30-50. The high (C-13)O abundance can be explained by substantial fractionation.
Bergman Per
Carlstrom U.
Olofsson Hans
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