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The Gaia-ESO survey : a lithium depletion boundary age for NGC 2232

Binks, A. S. (author)
Keele Univ, Sch Chem & Phys Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England.
Jeffries, R. D. (author)
Keele Univ, Sch Chem & Phys Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England.
Jackson, R. J. (author)
Keele Univ, Sch Chem & Phys Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England.
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Franciosini, E. (author)
INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
Sacco, G. G. (author)
INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
Bayo, A. (author)
Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Av Gran Bretana 1111, Valparaiso, Chile.;Univ Valparaiso, Nucleo Milenio Formac Planetaria NPF, Av Gran Bretana 1111, Valparaiso, Chile.
Magrini, L. (author)
INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
Randich, S. (author)
INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
Arancibia-Silva, J. (author)
Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Av Gran Bretana 1111, Valparaiso, Chile.;Univ Valparaiso, Nucleo Milenio Formac Planetaria NPF, Av Gran Bretana 1111, Valparaiso, Chile.
Bergemann, M. (author)
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
Bragaglia, A. (author)
INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy.
Gilmore, G. (author)
Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
Gonneau, A. (author)
Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
Hourihane, A. (author)
Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
Jofre, P. (author)
Univ Diego Portales UDP, Fac Ingn & Ciencias, Nucleo Astron, Santiago, Chile.
Korn, Andreas, 1972- (author)
Uppsala universitet,Observationell astrofysik
Morbidelli, L. (author)
INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
Prisinzano, L. (author)
INAF Osservatorio Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy.
Worley, C. C. (author)
Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
Zaggia, S. (author)
INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
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Keele Univ, Sch Chem & Phys Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy. (creator_code:org_t)
2021-05-12
2021
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 505:1, s. 1280-1292
Related links:
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Astrometry and photometry from Gaia and spectroscopic data from the Gaia-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialized spectral line analysis procedure was used to recover the signature of undepleted lithium in very low luminosity cluster members. An age of 38 +/- 3 Myr is inferred by comparing the LDB location in absolute colour-magnitude diagrams (CMDs) with the predictions of standard models. This is more than twice the age derived from fitting isochrones to low-mass stars in the CMD with the same models. Much closer agreement between LDB and CMD ages is obtained from models that incorporate magnetically suppressed convection or flux-blocking by dark, magnetic starspots. The best agreement is found at ages of 45-50 Myr for models with high levels of magnetic activity and starspot coverage fractions >50 percent, although a uniformly high spot coverage does not match the CMD well across the full luminosity range considered.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

stars: kinematics and dynamics
stars: late-type
stars: pre-main-sequence
solar neighbourhood

Publication and Content Type

ref (subject category)
art (subject category)

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