He 2-104 revisited.

Details He 2-104 revisited. He 2-104 revisited.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..629d&link_type=abstract

Astronomy and Astrophysics, v.309, p.629-632

Astronomy and Astrophysics

Astrophysics

5

Stars: Abundances, Planetary Nebulae: Individual: He2-104

Scientific paper

We report new spectroscopic observations of He 2-104 (the southern crab). The Balmer decrement indicates a reddening corresponding to a colour excess E(B-V)=1.2mag. The main body of the ionized region has an important density stratification with values ranging from 10^3^cm^-3^ up to 6-7x10^6^cm^-3^, shown by a robust correlation between density and the ionization potential of the preceding ion. The average electron temperature through that region is about 13000K. Our data suggests only a modest enhancement of He and N. The Stoy temperature of the hot star is of the order of 30000K, suggesting an early evolutionary stage for the planetary.

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