The young detached CO shell around U Camelopardalis

Details The young detached CO shell around U Camelopardalis The young detached CO shell around U Camelopardalis

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...351l...1l&link_type=abstract

Astronomy and Astrophysics, v.351, p.L1-L4 (1999)

Astronomy and Astrophysics

Astrophysics

31

Stars: Carbon, Stars: Circumstellar Matter, Stars: Individual: U Cam, Stars: Mass-Loss

Scientific paper

We report IRAM Plateau de Bure interferometer observations of the carbon star U Cam in the COi and COii lines. The remarkable images show that U Cam is surrounded by a geometrically thin, ~ 1016 cm, shell of gas at a distance of ~ 6x1016 cm from the star, that expands with a velocity of ~ 23 km s-1. The estimated mass of the shell is low, ~ 10-3 M_sun. In addition, we detect emission that peaks at the stellar position. From this we estimate a present mass loss rate and gas expansion velocity of ~ 2.5x10-7 M_sun yr-1 and 12 km s-1, respectively. One possible explanation to the structure of the circumstellar medium is that the shell was produced during a very short period, ~ 150 yr, of high mass loss rate, ~ 10-5 M_sun yr-1, about 800 yr ago. U Cam may fit into the scenario where a helium-shell flash modulates the mass loss rate on short times scales.

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