Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..188t&link_type=abstract
The Astronomical Journal, vol. 108, no. 1, p. 188-194
Astronomy and Astrophysics
Astronomy
34
Interstellar Matter, Ionization, Planetary Nebulae, Stellar Motions, Charge Coupled Devices, Hydrodynamic Equations, Morphology, Stellar Mass
Scientific paper
Four old planetary nebulae have been observed, and are found to be interacting with the interstellar medium (ISM). This appears to have commenced fairly recently in A34 and A61, since the tell-tale asymmetric brightness enhancements are present in images taken in both (N ll) and (O lll). However, the (N ll) (O lll) ratio is much higher in the interaction region than elsewhere, probably due to the increased densities and complicated motions expected there. By contrast, the regions of A31 and A62 which are bright in (O lll) are considerably smaller than the size of the nebula visible in (N ll). We interpret this as being due to a more advanced interaction than with A34 and A62. This ionization stratification may provide a simpler approach for probing the surrounding ISM than using hydrodynamic models.
Kwitter Karen B.
Tweedy Richard W.
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