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Young giants of intermediate mass Evidence of rotation and mixing

Abstract : Context. In the search of a sample of metal-poor bright giants using Strömgren photometry, we serendipitously found a sample of 26 young (ages younger than 1 Gyr) metal-rich giants, some of which have high rotational velocities. Aims. We determined the chemical composition and rotational velocities of these stars in order to compare them with predictions from stellar evolution models. These stars where of spectral type A to B when on the main sequence, and we therefore wished to compare their abundance pattern to that of main-sequence A and B stars. Methods. Stellar masses were derived by comparison of the position of the stars in the colour-magnitude diagram with theoretical evolutionary tracks. These masses, together with Gaia photometry and parallaxes, were used to derive the stellar parameters. We used spectrum synthesis and model atmospheres to determine chemical abundances for 16 elements (C,
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https://hal-obspm.ccsd.cnrs.fr/obspm-03372815
Contributor : Linda Lombardo Connect in order to contact the contributor
Submitted on : Monday, October 11, 2021 - 10:31:49 AM
Last modification on : Wednesday, October 13, 2021 - 3:12:06 AM

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Linda Lombardo, Patrick François, Piercarlo Bonifacio, Elisabetta Caffau, A. Matas Pinto, et al.. Young giants of intermediate mass Evidence of rotation and mixing. Astronomy and Astrophysics - A&A, EDP Sciences, 2021, ⟨10.1051/0004-6361/202141408⟩. ⟨obspm-03372815⟩

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