Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376..484j&link_type=abstract
Astronomy and Astrophysics, v.376, p.484-488 (2001)
Astronomy and Astrophysics
Astrophysics
3
Planetary Nebulae: General, Planetary Nebulae: Individual: Bv 5-1, Radio Lines: Ism, Stars: Mass Loss
Scientific paper
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 ~ 10-4 Msun. 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 (~2.4*E4 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. Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).
Bachiller Rafael
Josselin Eric
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