| Issue |
A&A
Volume 376, Number 2, September II 2001
|
|
|---|---|---|
| Page(s) | 484 - 488 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010922 | |
| Published online | 15 September 2001 | |
A disrupted molecular ring in planetary nebula G119.3+00.3 (BV 5-1)*
1
GRAAL-CC72, UMR 5024-ISTEEM, CNRS/Univ. Montpellier II, 34095 Montpellier Cedex 05, France
2
Observatorio Astronómico Nacional (OAN), IGN, Apartado 1143, 28800 Alcalá de Henares, Spain
Corresponding author: E. Josselin, josselin@graal.univ-montp2.fr
Received:
27
April
2001
Accepted:
26
June
2001
New, high-sensitivity interferometric CO observations
of BV 5-1 show that the molecular gas in this bipolar planetary nebula
is distributed along a very inhomogeneous ring made of clumps.
The individual masses of such molecular clumps are 
.
The BV 5-1 molecular ring is seen edge-on, it is nearly perpendicular
to the axis of bipolarity of the nebula, and it is expanding
with an expansion velocity of ~9 km s-1.
BV 5-1 is confirmed to be a relatively evolved nebula, as
indicated by both its kinematic age (
yrs) and its molecular
to ionized mass ratio (~0.3). The structure of the BV 5-1 molecular ring,
as well as that of other rings previously observed in a few additional nebulae,
underscore the importance of strongly asymmetrical mass loss processes starting
early at the asymptotic giant branch phase.
Key words: planetary nebulae: general / planetary nebulae: individual: BV 5-1 / radio lines: ISM / stars: mass loss
© ESO, 2001
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