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

被引：21

作者：

Binks, A. S. ^{[1
]}

Jeffries, R. D. ^{[1
]}

Jackson, R. J. ^{[1
]}

Franciosini, E. ^{[2
]}

Sacco, G. G. ^{[2
]}

Bayo, A. ^{[3
,4
]}

Magrini, L. ^{[2
]}

Randich, S. ^{[2
]}

Arancibia-Silva, J. ^{[3
,4
]}

Bergemann, M. ^{[5
]}

Bragaglia, A. ^{[6
]}

Gilmore, G. ^{[7
]}

Gonneau, A. ^{[7
]}

Hourihane, A. ^{[7
]}

Jofre, P. ^{[8
]}

Korn, A. J. ^{[9
]}

Morbidelli, L. ^{[2
]}

Prisinzano, L. ^{[10
]}

Worley, C. C. ^{[7
]}

Zaggia, S. ^{[11
]}

机构：

[1] Keele Univ, Sch Chem & Phys Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England

[2] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[3] Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Av Gran Bretana 1111, Valparaiso, Chile

[4] Univ Valparaiso, Nucleo Milenio Formac Planetaria NPF, Av Gran Bretana 1111, Valparaiso, Chile

[5] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[6] INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy

[7] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[8] Univ Diego Portales UDP, Fac Ingn & Ciencias, Nucleo Astron, Santiago, Chile

[9] Uppsala Univ, Dept Phys & Astron, Div Astron & Space Phys, Observat Astrophys, Box 516, SE-75120 Uppsala, Sweden

[10] INAF Osservatorio Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy

[11] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 505卷 / 01期

基金：

欧洲研究理事会; 英国科学技术设施理事会;

关键词：

stars: kinematics and dynamics; stars: late-type; stars: pre-main-sequence; solar neighbourhood; BROWN DWARF CANDIDATES; GAMMA VELORUM CLUSTER; MASS ECLIPSING BINARY; SEQUENCE STARS OLDER; PRECISE DETERMINATION; MAGNETIC-FIELDS; INFLATED RADII; BETA-PICTORIS; KECK SPECTRA; MYR;

D O I：

10.1093/mnras/stab1351

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1280 / 1292

页数：13

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