Radio observations at 14.7 GHz of southern planetary nebulae

Details Radio observations at 14.7 GHz of southern planetary nebulae Radio observations at 14.7 GHz of southern planetary nebulae

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...50..209m&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 50, Nov. 1982, p. 209-215.

Astronomy and Astrophysics

Astrophysics

82

Planetary Nebulae, Radiant Flux Density, Radio Spectra, Southern Sky, Microwave Emission, Optical Thickness, Radio Observation

Scientific paper

Peak and integrated radio flux densities at 14.7 GHz are presented for 397 celestial objects located south of declination +27 deg and listed as planetary nebulae in the Perek and Kohoutek (1967) catalog. The objects include 260 confirmed planetary nebulae (CPN's), 25 suspect faint planetary nebulae (SFPN's), 21 nebulae of the MV (misclassified, very low excitation) class, five diffuse nebulae, 20 stars, five peculiar objects, 21 objects that were not detected optically, and 40 unclassified nebulae. The integrated flux densities of 264 of the objects (including 236 CPN's) are compared with 5-GHz data for the same objects, and all 264 objects are shown to be optically thin in their radio emission between 5 and 14.7 GHz. It is found that the following percentages of the 397 objects were detected above the 2-sigma level (10 mJy) of the survey: (1) 87% of the 211 CPN's classified on the basis of their optical spectra; (2) 84% of the 49 CPN's classified on the basis of their optical appearance; (3) 95% of the nebulae of the MV class; (4) 76% of the SFPN's; (5) 100% of the diffuse nebulae; (6) 26% of the 46 objects in the remaining classes; and (7) 50% of the unclassified nebulae.

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