Internal motions in thirty-two genuine planetary nebulae and in a misclassified object

Details Internal motions in thirty-two genuine planetary nebulae and in a misclassified object Internal motions in thirty-two genuine planetary nebulae and in a misclassified object

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...65..259s&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 65, no. 2, Aug. 1986, p. 259-265. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

30

Planetary Nebulae, Velocity Distribution, Astronomical Spectroscopy, B Stars, H Alpha Line, H Beta Line, H Ii Regions, Main Sequence Stars, O Stars

Scientific paper

The forbidden O III, H-alpha, and forbidden N II expansion velocities for thirty-three planetary nebulae are derived from high-dispersion spectroscopy. The expansion-velocity/nebular-radius correlations found by Sabbadin (1984) for planetary nebulae of the subclasses B and C of Greig (1971 and 1972) are confirmed. Observational evidence is presented indicating that A 77 (97 + 3 deg 1) is not a planetary nebula but a quite compact (nebular radius = about 1.1 pc) H II region located at about 7 kpc from the sun and excited by a late-O/early-B main-sequence star.

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