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Lithium 6104 Å in Population II stars

Ford, A.; Jeffries, R.D.; Smalley, B.; Ryan, S.G.; Aoki, W.; Kawanomoto, S.; James, D.J. and Barnes, J.R. (2002). Lithium 6104 Å in Population II stars. Astronomy and Astrophysics, 393 pp. 617–628.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361:20021040
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Abstract

We have obtained échelle spectroscopy of 14 Population II objects selected from those previously observed by Bonifacio & Molaro (1997). For one object, HD 140283, we obtained exquisite data with the High Dispersion Spectrograph on the Subaru Telescope, with S/N exceeding 1000 per 0.018 Å pixel. Li abundances have been determined by spectral synthesis from both the 6708 Å resonance line and also from 6104 Å subordinate feature. Firm detections of the weak line have been made in seven objects, and upper limits are reported for the remainder. Our 6708 Å abundances agree with those reported by Bonifacio & Molaro with a mean difference of only 0.019 +/- 0.009 dex. Abundances from the 6104 Å line hint at a higher Li abundance than that determined from the resonance feature, but this evidence is mixed; the weakness of the 6104 Å line and the large number of upper limits make it difficult to draw firm conclusions. NLTE-corrections increase (rather than eliminate) the size of the (potential) discrepancy, and binarity appears unlikely to affect any abundance difference. The effect of multi-dimensional atmospheres on the line abundances was also considered, although it appears that use of 3-D (LTE) models could again act to increase the discrepancy, if one is indeed present.

Item Type: Journal Article
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetUK Particle Physics and Astronomy Research Council (PPARC) [grant PPA/0/S/1998/00658]
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record. Article published by EDP Sciences and available at http://www.edpsciences.org/aa or http://dx.doi.org/10.1051/0004-6361:20021040
Keywords: stars abundances; Population II; stars interiors
Academic Unit/Department: ?? scie-phya ??
Item ID: 4531
Depositing User: Users 6827 not found.
Date Deposited: 07 Jul 2006
Last Modified: 25 Feb 2012 14:26
URI: http://oro.open.ac.uk/id/eprint/4531
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