Planetary nebulae and the pregalactic helium abundance

Details Planetary nebulae and the pregalactic helium abundance Planetary nebulae and the pregalactic helium abundance

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...200..178m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 200, no. 1-2, July 1988, p. 178-184. Research supported by CNPq.

Astronomy and Astrophysics

Astrophysics

6

Abundance, Galactic Evolution, H Ii Regions, Helium, Planetary Nebulae, Big Bang Cosmology, Chemical Evolution, Milky Way Galaxy, Neutrinos

Scientific paper

Planetary nebulae (PN) of types IIa and IIb are used to determine the pregalactic helium abundance Yp and the slope ΔY/ΔZ. From the planetary nebulae alone an upper limit to Yp can be derived. The combination of PN with galactic and extragalactic H II regions produces a good correlation between the helium abundance by mass Y and the metallicity Z, from which average values can be deduced as Yp = 0.234±0.004, and ΔY/ΔZ = 3.5±0.3. The cosmological consequences of this result are briefly discussed, in view of recent determinations of the abundances of light elements.

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