Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284...32p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 1, pp. 32-44.
Astronomy and Astrophysics
Astronomy
16
Ism: Abundances, Planetary Nebulae: General, Planetary Nebulae: Individual: Abell 41, Planetary Nebulae: Individual: Abell 46, Planetary Nebulae: Individual: Abell 63, Planetary Nebulae: Individual: Abell 65
Scientific paper
Imaging and spectroscopy are presented for four planetary nebulae known to contain close binary central stars resulting from a recent phase of common-envelope evolution. All the objects appear to exhibit axisymmetric nebulae which may be interpreted as inclined bipolar nebulae. In at least one object the bipolar caps can be seen, demonstrating the tightly collimated nature of the PN having an aspect ratio of ~7. Determinations of the nebular abundances show that He is significantly enhanced in all of the objects. These results are in agreement with theoretical expectations. Uncertainties in the nebular electron temperature constrain other abundances less well. The line fluxes indicate that N is unexpectedly underabundant. This effect is probably not real and may be an artefact of electron temperature fluctuations within the nebulae.
Bell Aaron S.
Pollacco Don L.
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