2000A&A...361L...1P

Query : 2000A&A...361L...1P

2000A&A...361L...1P - Astronomy and Astrophysics, volume 361L1-4 (2000/9-1)

Third-dredge-up oxygen in planetary nebulae.

PEQUIGNOT D., WALSH J.R., ZIJLSTRA A.A. and DUDZIAK G.

Abstract (from CDS):

The planetary nebulae He2-436 and Wray16-423 in the Sagittarius dwarf galaxy appear to result from nearly twin stars, except that third-dredge-up carbon is more abundant in He2-436. A thorough photoionization-model analysis implies that ratios Ne/O, S/O and Ar/O are significantly smaller in He2-436, indicative of third-dredge-up oxygen enrichment. The enrichment of oxygen with respect to carbon is (7±4)%. Excess nitrogen in Wray 16-423 suggests third dredge-up of late-CN-cycle products even in these low-mass, intermediate-metallicity stars.

Abstract Copyright: ∼

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - ISM: planetary nebulae: general - ISM: planetary nebulae: general - ISM: planetary nebulae: general - galaxies: dwarf - galaxies: individual: Sagittarius

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
4 WRAY 16-423 PN 19 22 10.63 -31 30 38.7   13.0 14.20     ~ 51 0
5 Hen 2-436 PN 19 32 06.7087636488 -34 12 57.520724796   13.3       [WC4] 84 0

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