Interferometric molecular line observations of the circumstellar envelope(s) around U Camelopardalis.

Details Interferometric molecular line observations of the circumstellar envelope(s) around U Camelopardalis. Interferometric molecular line observations of the circumstellar envelope(s) around U Camelopardalis.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305l..57l&link_type=abstract

Astronomy and Astrophysics, v.305, p.L57

Astronomy and Astrophysics

Astrophysics

17

Circumstellar Matter, Stars: Late Type, Stars: Agb And Post-Agb, Stars: Mass Loss, Stars: Carbon, Stars: U Cam

Scientific paper

We have observed the circumstellar envelope of the carbon star U Cam in the HCN(J=1->0) and CN(N=1->0) lines using the IRAM Plateau de Bure interferometer. There is evidence of a two-envelope structure: an outer extended envelope, possibly a shell, with a radius of ~7x10^16^cm, that expands with a velocity of ~25km/s, surrounding an inner envelope with a radius of ~6x10^15^cm and an expansion velocity of only ~13km/s. Mass loss rate estimates based on these data alone are uncertain, but they suggest that the mass loss rate during the formation of the outer envelope was higher than during the present mass loss epoch. Thus, we have evidence for a significant variation in the mass loss characteristics of U Cam within the last 10^3^years.

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