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Title:
Physical Conditions of the Planetary Nebula NGC 5315 Derived from VLT Echelle Observations and the t2 Problem
Authors:
Peimbert, Manuel; Peimbert, Antonio; Ruiz, María Teresa; Esteban, César
Affiliation:
AA(Instituto de Astronomía, UNAM, Apartado Postal 70-264, México D.F. 04510, México ), AB(Instituto de Astronomía, UNAM, Apartado Postal 70-264, México D.F. 04510, Mexico; ), AC(Departamento de Astronomía, Universidad de Chile, Casilla Postal 36D, Santiago de Chile, Chile; ), AD(Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; )
Publication:
The Astrophysical Journal Supplement Series, Volume 150, Issue 2, pp. 431-454. (ApJS Homepage)
Publication Date:
02/2004
Origin:
UCP
ApJ Keywords:
ISM: Abundances, Nuclear Reactions, Nucleosynthesis, Abundances, ISM: Planetary Nebulae: Individual: NGC Number: NGC 5315
DOI:
10.1086/381090
Bibliographic Code:
2004ApJS..150..431P

Abstract

Echelle spectrophotometry of the planetary nebula NGC 5315 is presented. The data consist of VLT UVES observations in the 3100-10450 Å range. The intensities of 556 emission lines have been measured, including 508 identified permitted lines of H0, He0, C0, C+, N0, N+, N++, O0, O+, Ne0, Ne+, Mg+, Si+, S0, S+, S++, and Ar+. Electron temperatures and densities have been determined using many different line intensity ratios. The He+, C++, N++, O++, and Ne++ ionic abundances have been derived from recombination lines; these abundances are almost independent of the temperature structure of the nebula. Alternatively, abundances from collisionally excited lines have been derived for a large number of ions of different elements; these abundances depend strongly on the temperature structure. Accurate t2 values have been derived from the He I lines, and by comparing the O++ ionic abundances obtained from collisionally excited and recombination lines. The similarity between the widths and radial velocities of the O II and the [O III] lines rules out the presence of chemical abundance inhomogeneities in this object. The chemical composition of NGC 5315 is compared with those of the Orion nebula and the Sun.

Based on observations collected at the European Southern Observatory, Chile, proposal number ESO 68.C-0149(A).

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