HeI{lambda}10830 in red giant stars with HET/HPF Virtual Observatory Resource

Authors
  1. Sneden C.
  2. Afsar M.
  3. Bozkurt Z.
  4. Adamow M.
  5. Mallick A.
  6. Reddy B.E.,Janowiecki S.
  7. Mahadevan S.
  8. Bowler B.P.
  9. Hawkins K.
  10. Lind K.,Dupree A.K.
  11. Ninan J.P.
  12. Nagarajan N.
  13. Topcu G.B.
  14. Froning C.S.,Bender C.F.
  15. Terrien R.
  16. Ramsey L.W.
  17. Mace G.N.
  18. Published by
    CDS
Abstract

We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their HeI{lambda}10830 absorption strengths. This transition is an indicator of chromospheric activity and/or mass loss in red giants. The majority of stars in our sample reside in the red clump or red horizontal branch based on their V-J, M_V_ color-magnitude diagram, and Gaia Teff and log(g) values. Most of our target stars are Li-poor in the sense of having normally low Li abundances, defined here as log {epsilon}(Li)<1.25. Over 90% of these Li-poor stars have weak {lambda}10830 features. However, more than half of the 83 Li-rich stars (log{epsilon}(Li)>1.25) have strong {lambda}10830 absorptions. These large {lambda}10830 lines signal excess chromospheric activity in Li-rich stars; there is almost no indication of significant mass loss. The Li-rich giants may also have a higher binary fraction than Li-poor stars, based on their astrometric data. It appears likely that both residence on the horizontal branch and present or past binary interaction play roles in the significant Li-He connection established in this survey.

Keywords
  1. infrared-astronomy
  2. spectroscopy
  3. giant-stars
  4. line-intensities
  5. chemical-abundances
Bibliographic source Bibcode
2022ApJ...940...12S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/940/12
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/940/12
Document Object Identifer DOI
doi:10.26093/cds/vizier.19400012

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/940/12
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History

2024-11-22T14:10:04Z
Resource record created
2024-11-22T14:10:04Z
Created
2025-02-13T20:11:42Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
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cds-question@unistra.fr