Bibcode
Josselin, E.; Bachiller, R.; Manchado, A.; Guerrero, M. A.
Referencia bibliográfica
Astronomy and Astrophysics, v.353, p.363-370 (2000)
Fecha de publicación:
1
2000
Revista
Número de citas
13
Número de citas referidas
12
Descripción
We report high-sensitivity millimeter-wave CO observations of recently
discovered bipolar planetary nebulae (PNe). Three objects (BV 5-1, K
3-94 and K 3-24) have been detected, and one of them (BV 5-1) is
resolved by the ~ 10{''} telescope beam. The envelopes of the
three newly detected objects display values of the molecular to ionized
mass ratio of ~ 0.2, and sizes of ~ 0.1 pc. This indicates that these
PNe are rather evolved, with K 3-24 being the youngest of the three ( ~
103 years) according to its CO line profile and kinematic
ages. In BV 5-1, the molecular gas appears to be distributed in an
irregular disk or ring surrounding the central star and perpendicular to
the bipolar nebula. This is similar to the situation found in other
better studied bipolar PNe (e.g. NGC 2346, M 2-9, KjPn8), and thus seems
to be the rule in this class of objects. This suggests a common
mechanism for the rings and the bipolar flows that shape the optical
nebula.