The Type-I planetary nebula Humason 1-2

Details The Type-I planetary nebula Humason 1-2 The Type-I planetary nebula Humason 1-2

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..305s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 305-312. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

22

Astronomical Spectroscopy, Planetary Nebulae, Abundance, Chemical Composition

Scientific paper

Direct Hα+[N II] CCD frames and low and high resolution spectroscopy of the compact bright planetary nebula Humason 1-2 were obtained at Asiago Astrophysical Observatory to study the morphology, physical conditions, chemical abundances and expansion velocity field of this object. The nebula consists of a dense equatorial ring of condensations surrounded by fainter, polar material. The overabundances of He and N found in the nebula, its very short dynamical age and the position of the central star in the H-R diagram suggest that the progenitor of Hu1-2 was a massive star and that the present mass of the exciting star is larger than the mean value generally assumed for central stars of planetary nebulae. Some general properties of Type I planetary nebulae (i.e. those which are believed to derive from massive progenitors) are presented and discussed.

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