A thin molecular shell around the carbon star TT CYG

Details A thin molecular shell around the carbon star TT CYG A thin molecular shell around the carbon star TT CYG

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...330l...1o&link_type=abstract

Astronomy and Astrophysics, v.330, p.L1-L4 (1998)

Astronomy and Astrophysics

Astrophysics

24

Stars: Carbon, Circumstellar Matter, Stars: Individual: Tt Cyg, Stars: Mass-Loss, Radio Lines: Molecular: Circumstellar

Scientific paper

Interferometric CO({\jtra10} and {\tra21}) observations reveal a remarkably thin shell of molecular gas around the carbon star TT Cyg, width/radius la 1farcs 3/34arcsec ~ 0.04. It expands at ~13{km s(-1) , and contains ~ 0.02M_sun of gas provided the CO abundance with respect to H_2 is 10(-3) and the distance is 1kpc. Only about a quarter of the shell has been mapped, but we infer an overall spherical shell with only small, but clear, deviations at the per cent level. The radial structure of the shell is barely resolved at the arc second level, but there exists weak emission extending a few arc seconds inwards from the peak. A drastic change in mass loss properties, possibly combined with the effects of interacting winds, provides the most likely explanation to the origin of the shell. %

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