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Titolo:
Theoretical models of low-mass, pre-main sequence rotating stars - I. The effects on lithium depletion
Autore:
Mendes, LTS; DAntona, F; Mazzitelli, I;
Indirizzi:
UFMG, ICEX, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil UFMG Belo Horizonte MG Brazil BR-30123970 BC70 Belo Horizonte, MG, Brazil Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy Osservatorio Astron Roma Monte Porzio Catone Italy I-00040 Catone, Italy CNR, Ist Astrofis Spaziale, I-00044 Frascati, Italy CNR Frascati Italy I-00044 st Astrofis Spaziale, I-00044 Frascati, Italy
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 1, volume: 341, anno: 1999,
pagine: 174 - 180
SICI:
0004-6361(199901)341:1<174:TMOLPS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
STELLAR EVOLUTION; HALO STARS; TURBULENT CONVECTION; ANGULAR-MOMENTUM; ABUNDANCE; CLUSTER; OPACITIES; SUN; DYNAMICS; BINARIES;
Keywords:
stars : rotation; stars : pre-main sequence; stars : interiors; stars : evolution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Mendes, LTS UFMG,zilEX, Dept Fis, Caixa Postal 702, BR-30123970 Belo Horizonte, MG, Bra UFMG Caixa Postal 702 Belo Horizonte MG Brazil BR-30123970 BCa
Citazione:
L.T.S. Mendes et al., "Theoretical models of low-mass, pre-main sequence rotating stars - I. The effects on lithium depletion", ASTRON ASTR, 341(1), 1999, pp. 174-180

Abstract

Rotating stellar models of 1.2 M-. down to 0.6 M-. have been computed to investigate the effects of rotation on the lithium depletion of low-mass, pre-main sequence stars. The models were generated under three different rotation laws (rigid body rotation, local conservation of angular momentum overthe whole star, and local conservation of angular momentum in radiative zones and rigid body rotation in convective ones), no angular momentum loss and redistribution, and under two prescriptions for convection, namely the mixing length theory [MLT] and the turbulent convection introduced by Canuto& Mazzitelli (1991) [CM]. The general features of the rotating models are compatible with previous results by other authors. As for the lithium depletion, our results show that rotation decreases lithium depletion while the star is fully convective but increases it as soon as the star develops a radiative core, a result which is expected from the theory since rotating stars behave as non-rotating stars of lower mass and so must experience greater lithium depletion. The results hold for all three rotation laws assumed, but are specifically presented here for the case of rigid body rotation. This result shows that other physical mechanisms must play a role on the lithium depletion in the pre-main sequence, in order to explain the observational data on low-mass, pre-main sequence stars such as those from the Pleiades (Garcia Lopez et al. 1994) and the alpha-Persei clusters (Balachandran etal.1988,1996).

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Documento generato il 29/11/20 alle ore 16:25:11