Chemical abundances of a new halo planetary nebula

Details Chemical abundances of a new halo planetary nebula Chemical abundances of a new halo planetary nebula

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..421b&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, Apr. 15, 1977, p. 421-423, 425, 426.

Astronomy and Astrophysics

Astrophysics

22

Abundance, Helium, Planetary Nebulae, B Stars, Globular Clusters, H Ii Regions, Halos, Hydrogen Ions, O Stars, Radial Velocity

Scientific paper

A new galactic-halo planetary nebula has been discovered during an objective-prism survey near the south galactic pole. The nebula, designated 108-76 deg 1, has a high-excitation spectrum and a radial velocity of +196 km/s. An abundance analysis reveals a helium content similar to that of the planetary nebula in the globular cluster M15, galactic H II regions, and OB stars; the oxygen abundance is only about 1/25 that in the sun and in young objects. The nebula is interpreted as a very old metal-deficient object, possibly reflecting the primordial helium abundance.

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