Bibcode
López-Martín, L.; López, J. A.; Esteban, C.; Vázquez, R.; Raga, A.; Torrelles, J. M.; Miranda, L. F.; Meaburn, J.; Olguín, L.
Referencia bibliográfica
Astronomy and Astrophysics, v.388, p.652-659 (2002)
Fecha de publicación:
6
2002
Revista
Número de citas
24
Número de citas referidas
20
Descripción
The kinematics and physical conditions of the bipolar planetary nebula M
2-48 are analysed from high and low dispersion long-slit spectra.
Previous CCD narrow-band optical observations have suggested that this
nebula is mainly formed by a pair of symmetric bow-shocks, an off-center
semi-circular shell, and an internal bipolar structure. The bipolar
outflow has a complex structure, characterised by a series of shocked
regions located between the bright core and the polar tips. There is an
apparent kinematic discontinuity between the bright bipolar core and the
outer regions. The fragmented ring around the bright bipolar region
presents a low expansion velocity and could be associated with ejection
in the AGB-PN transition phase, although its nature remains unclear. The
chemical abundances of the central region are derived, showing that M
2-48 is a type I planetary nebula (PN).