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  Origin of α-rich young stars: clues from C, N, and O

Hekker, S., & Johnson, J. A. (2019). Origin of α-rich young stars: clues from C, N, and O. Monthly Notices of the Royal Astronomical Society, 487(3), 4343-4354. doi:10.1093/mnras/stz1554.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-F255-C Version Permalink: http://hdl.handle.net/21.11116/0000-0003-F256-B
Genre: Journal Article
Alternative Title : Origin of alpha-rich young stars: clues from C, N, and O

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 Creators:
Hekker, Saskia1, Author              
Johnson, Jennifer A, Author
Affiliations:
1Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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 Abstract: A small set of chemically old stars that appear young by their independently derived masses has been detected. These are so-called α-rich young stars. For a sample of 51 red-giant stars, for which spectra are available from SDSS/APOGEE and masses are available from asteroseismic measures based on Kepler lightcurves, we derive the C, N, and O abundances through an independent analysis. These stars span a wide range of N/C surface number density ratios. We interpret the high-mass stars with low N/C as being products of mergers or mass transfer during or after first dredge up, because the dredge-up features are the same as for low-mass stars. The α-rich young stars with high N/C follow the expected trend of N/C for their mass, and could be either genuine young stars (leaving their high [α/Fe] unexplained) or the results of mergers on the main sequence.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz1554
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 487 (3) Sequence Number: - Start / End Page: 4343 - 4354 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150