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  • Bouvier, J.Centre d'Ecologie Fonctionnelle et Evolutive (CEFE) (author)

The Gaia-ESO Survey: A lithium-rotation connection at 5 Myr?

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • 2016-05-16
  • EDP Sciences,2016

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:ce03ac51-8053-4b43-ad7a-796abac8cd3a
  • https://lup.lub.lu.se/record/ce03ac51-8053-4b43-ad7a-796abac8cd3aURI
  • https://doi.org/10.1051/0004-6361/201628336DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Context. The evolution of lithium abundance in cool dwarfs provides a unique probe of nonstandard processes in stellar evolution. Aims. We investigate the lithium content of young low-mass stars in the 5 Myr old, star forming region NGC 2264 and its relationship with rotation. Methods. We combine lithium equivalent width measurements (EW(Li)) from the Gaia-ESO Survey with the determination of rotational periods from the CSI 2264 survey. We only consider bona fide nonaccreting cluster members to minimize the uncertainties on EW(Li). Results. We report the existence of a relationship between lithium content and rotation in NGC 2264 at an age of 5 Myr. The Li-rotation connection is seen over a restricted temperature range (Teff = 3800-4400 K), where fast rotators are Li-rich compared to slow rotators. This correlation is similar to, albeit of lower amplitude than, the Li-rotation connection previously reported for K dwarfs in the 125 Myr old Pleiades cluster. We investigate whether the nonstandard pre-main-sequence models developed so far to explain the Pleiades results, which are based on episodic accretion, pre-main-sequence, core-envelope decoupling, and/or radius inflation due to enhanced magnetic activity, can account for early development of the Li-rotation connection. While radius inflation appears to be the most promising possibility, each of these models has issues. We therefore also discuss external causes that might operate during the first few Myr of pre-main-sequence evolution, such as planet engulfment and/or steady disk accretion, as possible candidates for the common origin for Li excess and fast rotation in young low-mass pre-main-sequence stars. Conclusions. The emergence of a connection between lithium content and rotation rate at such an early age as 5 Myr suggests a complex link between accretion processes, early angular momentum evolution, and possibly planet formation, which likely impacts early stellar evolution and has yet to be fully deciphered.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Lanzafame, A. C.Osservatorio Astrofisico di Catania (author)
  • Venuti, L.INAF - Osservatorio Astronomico di Padova (author)
  • Klutsch, A.Osservatorio Astrofisico di Catania (author)
  • Jeffries, R.Keele University (author)
  • Frasca, A.Osservatorio Astrofisico di Catania (author)
  • Moraux, E.Centre d'Ecologie Fonctionnelle et Evolutive (CEFE) (author)
  • Biazzo, K.Osservatorio Astrofisico di Catania (author)
  • Messina, S.Osservatorio Astrofisico di Catania (author)
  • Micela, G.INAF - Osservatorio Astronomico di Padova (author)
  • Randich, S.INAF - Osservatorio Astrofisico di Arcetri (author)
  • Stauffer, J.California Institute of Technology (author)
  • Cody, A. M.NASA Ames Research Center (author)
  • Flaccomio, E.INAF - Osservatorio Astronomico di Padova (author)
  • Gilmore, G.University of Cambridge (author)
  • Bayo, A.University of Valparaíso (author)
  • Bensby, T.Lund University,Lunds universitet,Astronomi - Har omorganiserats,Institutionen för astronomi och teoretisk fysik - Har omorganiserats,Naturvetenskapliga fakulteten,Lund Observatory - Has been reorganised,Department of Astronomy and Theoretical Physics - Has been reorganised,Faculty of Science(Swepub:lu)astr-tbe (author)
  • Bragaglia, A.European Southern Observatory Santiago (author)
  • Carraro, G.CSIC Instituto de Astrofísica de Andalucía (IAA) (author)
  • Casey, A.University of Cambridge (author)
  • Costado, M. T.University of Porto (author)
  • Damiani, F.INAF - Osservatorio Astronomico di Padova (author)
  • Delgado Mena, E.Liverpool John Moores University (author)
  • Donati, P.European Southern Observatory Santiago (author)
  • Franciosini, E.INAF - Osservatorio Astrofisico di Arcetri (author)
  • Hourihane, A.University of Cambridge (author)
  • Koposov, S.University of Cambridge (author)
  • Lardo, C.Andrés Bello National University (author)
  • Lewis, J.University of Cambridge (author)
  • Magrini, L.INAF - Osservatorio Astrofisico di Arcetri (author)
  • Monaco, L.Andrés Bello National University (author)
  • Morbidelli, L.INAF - Osservatorio Astrofisico di Arcetri (author)
  • Prisinzano, L.INAF - Osservatorio Astronomico di Padova (author)
  • Sacco, G.INAF - Osservatorio Astrofisico di Arcetri (author)
  • Sbordone, L.Pontifical Catholic University of Chile (author)
  • Sousa, S. G.University of Porto (author)
  • Vallenari, A.INAF - Osservatorio Astronomico di Padova (author)
  • Worley, C. C.University of Cambridge (author)
  • Zaggia, S.INAF - Osservatorio Astronomico di Padova (author)
  • Zwitter, T.University of Ljubljana (author)
  • Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)Osservatorio Astrofisico di Catania (creator_code:org_t)

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  • In:Astronomy and Astrophysics: EDP Sciences5900004-63611432-0746

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