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- W1993334926 abstract "The intensities of the (SIII) lambda9532 lines have been measured for the first time in the three known extreme halo planetary nebulae. Improved measurements have also been made of the (SII) lambda6717+lambda6731 lines. The S/H abundance ratios are (4.7 +- 6.8) x 10/sup -7/ for 108-76/sup 0/1, (1.4 +- 1.1) x 10/sup -7/ for K648, and (1.6 +- 1.1) x 10/sup -7/ for 49+88/sup 0/1. The S abundance in 108-76/sup 0/1 is too uncertain to draw any conclusions except that it is less than a tenth solar. The S abundances in the other two are approximately 1/100 of those in disk planetary nebulae and the Sun, consistent with the low Ar abundances also found in the halo planetary nebulae and with the Fe deficiency in the stars in M15, of which K648 is a member. Since the O and Ne abundances in the halo nebulae cover a wide range (nearly solar to 1/50 solar), the implication is that either the abundances of these elements have been enhanced by nuclear reactions in the planetary progenitors of S and Ar were synthesized galactically at a slower rate than O or Ne. In either case, it appears that S, like Ar, may bemore » more representative of the true heavy-metal abundance in planetary nebulae than lighter elements like O and Ne.« less" @default.
- W1993334926 created "2016-06-24" @default.
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- W1993334926 date "1983-07-01" @default.
- W1993334926 modified "2023-10-14" @default.
- W1993334926 title "Sulfur abundances in three halo planetary nebulae" @default.
- W1993334926 doi "https://doi.org/10.1086/161154" @default.
- W1993334926 hasPublicationYear "1983" @default.
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