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Sulphur abundances in disk stars as determined from the forbidden lambda 10821 [S I] line
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
2006 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 455, no 2, L13-L16 p.Article in journal (Refereed) Published
Abstract [en]

Aims. In this paper we aim to study the chemical evolution of sulphur in the galactic disk, using a new optimal abundance indicator: the [SI] line at 10821 angstrom. Similar to the optimal oxygen indicators, the [OI] lines, the [SI] line has the virtues of being less sensitive to the assumed temperatures of the stars investigated and of likely being less prone to non-LTE effects than other tracers.

Methods. High-resolution, near-infrared spectra of the [SI] line are recorded using the Phoenix spectrometer on the Gemini South telescope. The analysis is based on 1D, LTE model atmospheres using a homogeneous set of stellar parameters.

Results. The pi 10821 [SI] line is suitable for an abundance analysis of disk stars, and the sulphur abundances derived from it are consistent with abundances derived from other tracers. We corroborate that, for disk stars, the trend of sulphur-to-iron ratios with metallicity is similar to that found for other alpha elements, supporting the idea of a common nucleosynthetic origin.

Place, publisher, year, edition, pages
2006. Vol. 455, no 2, L13-L16 p.
Keyword [en]
stars : abundances; stars : atmospheres; stars : late-type; Galaxy : disk; infrared : stars
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-22078DOI: 10.1051/0004-6361:20065745ISI: 000239560000002OAI: oai:DiVA.org:uu-22078DiVA: diva2:49851
Available from: 2007-01-10 Created: 2007-01-10 Last updated: 2017-12-07Bibliographically approved

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Ryde, Nils

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