On metal-deficient barium stars and their link with yellow symbiotic stars.pdfVIP

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On metal-deficient barium stars and their link with yellow symbiotic stars.pdf

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On metal-deficient barium stars and their link with yellow symbiotic stars

a r X i v : a s t r o - p h / 0 5 0 6 5 9 2 v 1 2 4 J u n 2 0 0 5 Astronomy Astrophysics manuscript no. aa3298 February 2, 2008 (DOI: will be inserted by hand later) On metal-deficient barium stars and their link with yellow symbiotic stars? A. Jorissen1??, L. Zac?s2, S. Udry3, H. Lindgren4, and F.A. Musaev5,6,7 1 Institut d’Astronomie et d’Astrophysique, Universite? Libre de Bruxelles, CP 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium 2 Institute of Atomic Physics and Spectroscopy, University of Latvia, Rain?a bulva?ris 19, R??ga, LV 1586 Latvia 3 Observatoire de Gene?ve, CH-1290 Sauverny, Suisse 4 Lund Observatory, Box 43, SE-221 00, Lund, Sweden 5 Special Astrophysical Observatory and Isaac Newton Institute of Chile, SAO Branch, Nizhnij Arkhyz, 369167, Russia 6 ICAMER, National Academy of Sciences of Ukraine, 361605 Peak Terskol, Kabardino-Balkaria, Russia 7 Shamakhy Astrophysical Observatory, National Academy of Sciences of Azerbaijan, Azerbaijan Received / Accepted Abstract. This paper addresses the question of why metal-deficient barium stars are not yellow symbiotic stars (YSyS). Samples of (suspected) metal-deficient barium (mdBa) stars and YSyS have been collected from the literature, and their properties reviewed. It appears in particular that the barium nature of the suspected mdBa stars needs to be ascertained by detailed abundance analyses. Abundances are therefore derived for two of them, HD 139409 and HD 148897, which reveal that HD 148897 should not be considered a barium star. HD 139409 is a mild barium star, with overabundances observed only for elements belonging to the first s-process peak (Y and Zr). It is only moderately metal-poor ([Fe/H] = ?0.4). The evidence for binarity among metal-deficient barium stars is then reviewed, using three different methods: (i) radial-velocity variations (from CORAVEL observations), (ii) Hipparcos astrometric data, and (iii) a method based on the comparison between the Hipparcos and Tycho-2 proper m