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Chemical enrichment in halo planetary nebulae

Conference:

Abstract

Photoelectric spectrophotometry of emission lines in the 3400-7400 A region is presented for the planetary nebulae 108-76/sup 0/1(BB1). From these observations the relative abundances of H, He, C, N, O and Ne are derived. The abundances of the halo PN (BB1, H4-1 and K648) are compared to those predicted by stellar evolution theory under the assumption that the envelope has the chemical composition of the matter located between the H burning shell and the surface. The observed He/H and C/O values are higher than predicted which implies that halo PN contain matter from deeper layers than the H burning shell. Furthermore, the O/Ar, N/Ar and Ne/Ar values in halo PN are higher than in the solar neighbourhood, at least part of this enrichment is produced by the PN progenitors.
Authors:
Torres-Peimbert, S; Rayo, J F; Peimbert, M [1] 
  1. Universidad Nacional Autonoma de Mexico, Mexico City. Inst. de Astronomia
Publication Date:
Jan 01, 1981
Product Type:
Conference
Reference Number:
AIX-14-718586; EDB-83-037323
Resource Relation:
Journal Name: Rev. Mex. Astron. Astrofis.; (Mexico); Journal Volume: 6; Conference: 2. Latin American Regional Meeting on Astronomy, Merida (Venezuela), 19 - 23 Jan 1981
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; PLANETARY NEBULAE; CHEMICAL COMPOSITION; CARBON IONS; EMISSION SPECTRA; EXPERIMENTAL DATA; GALACTIC EVOLUTION; HELIUM IONS; HYDROGEN IONS; NEON IONS; NITROGEN IONS; OXYGEN IONS; SPECTROPHOTOMETRY; STELLAR ATMOSPHERES; ATMOSPHERES; CHARGED PARTICLES; DATA; INFORMATION; IONS; NEBULAE; NUMERICAL DATA; SPECTRA; 640105* - Astrophysics & Cosmology- Galaxies
OSTI ID:
6574429
Country of Origin:
Mexico
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: RMAAD
Submitting Site:
HEDB
Size:
Pages: 315-319
Announcement Date:
Jan 01, 1983

Conference:

Citation Formats

Torres-Peimbert, S, Rayo, J F, and Peimbert, M. Chemical enrichment in halo planetary nebulae. Mexico: N. p., 1981. Web.
Torres-Peimbert, S, Rayo, J F, & Peimbert, M. Chemical enrichment in halo planetary nebulae. Mexico.
Torres-Peimbert, S, Rayo, J F, and Peimbert, M. 1981. "Chemical enrichment in halo planetary nebulae." Mexico.
@misc{etde_6574429,
title = {Chemical enrichment in halo planetary nebulae}
author = {Torres-Peimbert, S, Rayo, J F, and Peimbert, M}
abstractNote = {Photoelectric spectrophotometry of emission lines in the 3400-7400 A region is presented for the planetary nebulae 108-76/sup 0/1(BB1). From these observations the relative abundances of H, He, C, N, O and Ne are derived. The abundances of the halo PN (BB1, H4-1 and K648) are compared to those predicted by stellar evolution theory under the assumption that the envelope has the chemical composition of the matter located between the H burning shell and the surface. The observed He/H and C/O values are higher than predicted which implies that halo PN contain matter from deeper layers than the H burning shell. Furthermore, the O/Ar, N/Ar and Ne/Ar values in halo PN are higher than in the solar neighbourhood, at least part of this enrichment is produced by the PN progenitors.}
journal = {Rev. Mex. Astron. Astrofis.; (Mexico)}
volume = {6}
place = {Mexico}
year = {1981}
month = {Jan}
}