The circumstellar envelope of the carbon star S Scuti

Details The circumstellar envelope of the carbon star S Scuti The circumstellar envelope of the carbon star S Scuti

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253l..17o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. L17-L20.

Astronomy and Astrophysics

Astrophysics

34

Carbon Stars, S Stars, Stellar Envelopes, Stellar Mass Ejection, Brightness Distribution, Gas Expansion

Scientific paper

CO(J = 1-0) observations of the bright carbon star S Sct show that the star is surrounded by a large (about 5.3 x 10 exp 17 cm) shell of gas expanding at a velocity of 16.5 km/s. It was produced during a brief period (about 1200 years) of high mass loss (about 4 x 10 exp-5 solar mass/yr) about 10 exp 4 years ago. The current mass losss rate and gas expansion velocity are only about 3 x 10 exp -8 solar mass/yr and about 5 km/s, respectively. This indicates that the star has gone through a very eruptive phase, possibly induced by a thermal pulse. The simple kinematics of the shell makes it possible to infer an overall spherical symmetry of the otherwise definitely clumpy CO brightness distribution. Thus, the mass loss must have been globally spherically symmetric, and the material was probably ejected in the form of lumps.

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