Royer, F and Gebran, M and Monier, R and Hill, G and Gulliver, A and Adelman, S and Smalley, B and Pintado, O and Reiners, A (2014) Normal A0-A1 stars with low v sin i. ASTRONOMY & ASTROPHYSICS, 562 (A84). 265 - 269. ISSN 1432-0746

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Abstract

Context. The study of rotational velocity distributions for normal stars requires an accurate spectral characterization of the objects in order to avoid polluting the results with undetected binary or peculiar stars. This piece of information is a key issue in the understanding of the link between rotation and the presence of chemical peculiarities.
Aims. A sample of 47 low vsini A0−A1 stars (vsini < 65 km   s-1), initially selected as main-sequence normal stars, are investigated with high-resolution and high signal-to-noise spectroscopic data. The aim is to detect spectroscopic binaries and chemically peculiar stars, and eventually establish a list of confirmed normal stars.
Methods. A detailed abundance analysis and spectral synthesis is performed to derive abundances for 14 chemical species. A hierarchical classification, taking measurement errors into account, is applied to the abundance space and splits the sample into two different groups, identified as the chemically peculiar stars and the normal stars.
Results. We show that about one third of the sample is actually composed of spectroscopic binaries (12 double-lined and five single-lined spectroscopic binaries). The hierarchical classification breaks down the remaining sample into 13 chemically peculiar stars (or uncertain) and 17 normal stars.

Item Type: Article
Additional Information: Reproduced with permission from Astronomy and Astrophysics © ESO
Uncontrolled Keywords: stars: early-type / stars: rotation / stars:abundances / stars: chemically peculiar / binaries: spectroscopic
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
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Depositing User: Symplectic
Date Deposited: 14 Jul 2016 07:53
Last Modified: 14 Jul 2016 07:53
URI: http://eprints.keele.ac.uk/id/eprint/2021

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