Optical observations of planetary nebula candidates from the northern hemisphere.

Details Optical observations of planetary nebula candidates from the northern hemisphere. Optical observations of planetary nebula candidates from the northern hemisphere.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..118..243v&link_type=abstract

Astronomy and Astrophysics Supplement, v.118, p.243-262

Astronomy and Astrophysics

Astrophysics

13

Planetary Nebulae: General

Scientific paper

We present Hα+[N II] images of 17 and low resolution spectra of 14 IRAS-selected planetary nebula candidates. The Hα+[N II] images are presented as finding charts. Contour plots are shown for the resolved planetary nebulae. From these images accurate optical positions and mean optical angular diameters were determined. Optical spectra show that the IRAS-selected and radio detected planetary nebula candidates are indeed planetary nebulae. Three planetary nebula candidates, previously not detected in the radio continuum were seen in Hα . They are larger, low surface brightness planetary nebulae. Most of these IRAS planetary nebulae are heavily extinct, having an average A_V_ of 7 magnitudes. About half of the planetary nebulae seem to be of low excitation, having central stars with an effective temperature probably ~60.000 K or less.

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