Unveiling the structure of the planetary nebula M 2-48: Kinematics and physical conditions
Por:
López-Martín L., López J.A., Esteban C., Vázquez R., Raga A., Torrelles J.M., Miranda L.F., Meaburn J., Olguín L.
Publicada:
1 ene 2002
Resumen:
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).
Filiaciones:
López-Martín L.:
Instituto de Astrofísica de Canarias, c/Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
Observatoire de Paris, DEMIRM, UMR 8540 du CNRS, 61 avenue de l'Observatoire, 75014 Paris, France
López J.A.:
Instituto de Astronomía, UNAM, Km 103, Carretera Tijuana-Ensenada, 22860 Ensenada, B.C., Mexico
Esteban C.:
Instituto de Astrofísica de Canarias, c/Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
Vázquez R.:
Instituto de Astronomía, UNAM, Km 103, Carretera Tijuana-Ensenada, 22860 Ensenada, B.C., Mexico
Raga A.:
Instituto de Ciencias Nucleares, Circuito de la Investigación Científica, 04510 Cd. Universitaria, D.F., Mexico
Torrelles J.M.:
Institut d'Estudis Espacials de Catalunya, Instituto de Ciencias del Espacio (CSIC), Edifici Nexus, c/ Gran Capitá 2-4, 08034, Barcelona, Spain
Miranda L.F.:
Instituto de Astrofísica de Andalucía, CSIC, c/ Sancho Panza s/n, 18008 Granada, Spain
Meaburn J.:
Astronomy Department, University of Manchester, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, United Kingdom
Olguín L.:
Instituto de Astronomía, UNAM, Circuito de la Investigación Científica, 04510 Cd. Universitaria, D.F., Mexico
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