Journal Article

BESO échelle spectroscopy of solar-type stars at Cerro Armazones

K. Fuhrmann, R. Chini, V. H. Hoffmeister, R. Lemke, M. Murphy, W. Seifert and O. Stahl

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 4, pages 2311-2318
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17850.x
BESO échelle spectroscopy of solar-type stars at Cerro Armazones

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The Bochum Échelle Spectroscopic Observer BESO is a fibre-fed high-resolution spectrograph for the 1.5-m Hexapod Telescope at the Cerro Armazones Observatory in the Atacama desert in Chile. Here we report on the first BESO observations and model atmosphere analyses of solar-type stars secured in 2010 April. The quality of the data is first tested with a reflected sunlight spectrum as well as the standard G-type subgiant 70 Vir. We then investigate the bright and supposedly single F-type star ξ Gem and present the spectroscopic evidence that instead favours an equal-mass binary. We present also the first composite synthetic modelling of the G-type visual binary HR 3430 and discuss the spectroscopic observations that identify this as a triple system. We conclude with another triple, the famous and very nearby α Cen, and the basic stellar parameters of its inner, solar-type visual binary.

Keywords: instrumentation: spectrographs; techniques: spectroscopic; binaries: spectroscopic; stars: fundamental parameters; stars: solar-type

Journal Article.  5159 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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