Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-09
Astronomy and Astrophysics
Astrophysics
12 Figures Figure 3 in 7 parts (3a through 3g). Astrophysical Journal, in press
Scientific paper
10.1086/341146
HST STIS slitless spectroscopy of LMC PNs is the ideal tool to study their morphology and their ionization structures at once. We present the results from a group of 29 PNs that have been spatially resolved, for the first time, in all the major optical lines. Images in the light of \ha, \nii, and \oiii are presented, together with line intensities, measured from the extracted 1D and 2D spectra. A study on the surface brightness in the different optical lines, the electron densities, the ionized masses, the excitation classes, and the extinction follows, illustrating an ideal consistence with the previous results found by us on LMC PNs. In particular, we find the surface brightness decline with the photometric radius to be the same in most emission lines. We find that asymmetric PNs form a well defined cooling sequence in the excitation -- surface brightness plane, confirming their different origin, and larger progenitor mass.
Balick Bruce
Blades Chris J.
Mutchler Max
Palen Stacy
Shaw Richard A.
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