Journal Article

The abundance of iron-peak elements and the dust composition in η Carinae: manganese

M. A. Bautista, M. Meléndez, H. Hartman, T. R. Gull and K. Lodders

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 4, pages 2643-2652
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17642.x
The abundance of iron-peak elements and the dust composition in η Carinae: manganese

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We study the chemical abundances of the strontium filament found in the ejecta of η Carinae. In particular, we derive the abundances of iron-peak elements from the spectra of their singly ionized ions present in the optical/infrared (IR) spectra. In this paper we analyse the spectrum of Mn ii using a new non-local thermodynamic equilibrium (non-LTE) model for this system. In constructing this models we carried out theoretical calculations of radiative transition rates and electron impact excitation rate coefficients. We find that relative to Ni the gas-phase abundance ratio of Mn is roughly solar, similar to the Cr abundance but in contrast to the large enhancements in the abundances of Sc and Ti. We interpret this result as an indication of non-equilibrium condensation in the ejecta of η Carinae.

Keywords: atomic data; atomic processes; line: formation; stars: abundances; stars: individual: η Carinae; ISM: atoms

Journal Article.  5405 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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