Sulfur abundances in three halo planetary nebulae

Details Sulfur abundances in three halo planetary nebulae Sulfur abundances in three halo planetary nebulae

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..641b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 641-644.

Astronomy and Astrophysics

Astrophysics

27

Abundance, Planetary Nebulae, Sulfur, Argon, Forbidden Transitions, H Lines, Line Spectra, Oxygen

Scientific paper

S III 9532 A forbidden lines are measured in the three known extreme halo planetary nebulae, and measurements of the S II 6717 + 6731 A lines are improved. The S abundance in 108-76.1 deg appears to be less than 1/10 solar, and in 49 + 88.1 deg and K648, it is approximately 1/100 of the values of disk planetary nebulae and the sun. This is consistent with the low Ar abundances also found in the halo planetary nebulae, and with the Fe deficiency of the stars in M15 (of which K648 is a member). The solar-to-1/50 solar range of O and Ne abundances in the halo nebulae implies either that the abundances of these elements have been enhanced by nuclear reactions in the planetary progenitors, or that S and Ar were synthesized galactically at a slower rate than O or Ne.

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