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Cannibals in the thick disk: the youngα-rich stars as evolved blue stragglers

Jofré, P., Jorissen, A., Van Eck, S., Izzard, Robert, Masseron, T., Hawkins, K., Gilmore, G., Paladini, C., Escorza, A., Blanco-Cuaresma, S. and Manick, R. (2016) Cannibals in the thick disk: the youngα-rich stars as evolved blue stragglers Astronomy & Astrophysics, 595.

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Abstract

Spectro-seismic measurements of red giants enabled the recent discovery of stars in the thick disk that are more massive than 1.4 M⊙. While it has been claimed that most of these stars are younger than the rest of the typical thick disk stars, we show evidence that they might be products of mass transfer in binary evolution, notably evolved blue stragglers. We took new measurements of the radial velocities in a sample of 26 stars from APOKASC, including 13 “young” stars and 13 “old” stars with similar stellar parameters but with masses below 1.2 M⊙ and found that more of the young starsappear to be in binary systems with respect to the old stars.Furthermore, we show that the young stars do not follow the expected trend of [C/H] ratios versus mass for individual stars. However, with a population synthesis of low-mass stars including binary evolution and mass transfer, we can reproduce the observed [C/N] ratios versus mass. Our study shows how asteroseismology of solar-type red giants provides us with a unique opportunity to study the evolution of field blue stragglers after they have left the main-sequence.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Jofré, P.
Jorissen, A.
Van Eck, S.
Izzard, Robertr.izzard@surrey.ac.uk
Masseron, T.
Hawkins, K.
Gilmore, G.
Paladini, C.
Escorza, A.
Blanco-Cuaresma, S.
Manick, R.
Date : 28 October 2016
DOI : 10.1051/0004-6361/201629356
Depositing User : Karen Garland
Date Deposited : 04 Oct 2018 14:08
Last Modified : 04 Oct 2018 14:08
URI: http://epubs.surrey.ac.uk/id/eprint/849561

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