Journal Article

Discovery of the nearby F6V star HR 3220 as a field blue straggler

K. Fuhrmann, R. Chini, V. H. Hoffmeister and O. Stahl

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 1, pages 391-392
Published in print September 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19042.x
Discovery of the nearby F6V star HR 3220 as a field blue straggler

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We report the discovery of the nearby single-lined and metal-poor F6V star HR 3220 as a field blue straggler from a basic inconsistency of the τ≃ 3 Gyr evolutionary age compared to its low iron-to-magnesium abundance ratio which implies that HR 3220 must be instead as old as τ≃ 10 Gyr. Our finding is corroborated by the observational constraints of the spectroscopic and astrometric P= 899 d orbit, leading to a secondary mass MB≃ 0.42+0.09− 0.05 M that matches the Rappaport et al. period-white dwarf mass relation and the case of a mass transfer system.

Keywords: blue stragglers; stars: fundamental parameters; stars: individual: HR 3220; stars: solar-type; white dwarfs

Journal Article.  1544 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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