Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..220p&link_type=abstract
"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,
Other
2
Scientific paper
The two planetary nebulae (PNe) Wray 16-423 and He 2-436 belong to the newly recognized Sagittarius dwarf galaxy and appear as nearly twin events. Carbon is more abundant in He 2-436, confirming that the amount of third-dredge-up material may be different in two otherwise similar objects. The high degree of homogeneity of all available data sets and adopted procedures, the common origin of these PNe, their large and different C overabundances, and finally the low initial abundances of their parent stars provide favorable circumstances to study by-products of the third dredge-up. Extensive photoionization modeling strongly suggests that, assuming identical sulfur abundances, oxygen is more abundant in He 2-436 than in Wray 16-423, thus possibly disclosing for the first time third-dredge-up oxygen. If C is mainly in gaseous form, the increment ratio by number is ΔO/ΔC =0.07 within a factor of 2. Argon is roughly constant whereas neon may moderately increase together with C and O. An open question is the relationship between the excess of nitrogen and the lesser overabundance of C in Wray 16-423.
Dudziak Gregory
Pequignot Daniel
Walsh Jeremy
Zijlstra Albert A.
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