A TEST OF PRE-MAIN-SEQUENCE LITHIUM DEPLETION MODELS
نویسندگان
چکیده
منابع مشابه
A Test Of Pre-Main-Sequence Lithium Depletion Models
Despite the extensive study of lithium depletion during pre-main-sequence (PMS) contraction, studies of individual stars show discrepancies between ages determined from the Hertzsprung–Russell (H–R) diagram and ages determined from lithium depletion, indicating open questions in the PMS evolutionary models. To further test these models, we present high-resolution spectra for members of the β Pi...
متن کاملPre-main-sequence Lithium Depletion
In this review I briefly discuss the theory of pre-main-sequence (PMS) Li depletion in low-mass (0.075 < M < 1.2M⊙) stars and highlight those uncertain parameters which lead to substantial differences in model predictions. I then summarise observations of PMS stars in very young open clusters, clusters that have just reached the ZAMS and briefly highlight recent developments in the observation ...
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Intermediate resolution spectroscopy from the ESO Very Large Telescope is analysed for 63 photometrically selected low-mass (0.08-0.30 M ⊙) candidates of the open cluster NGC 2547. We have confirmed membership for most of these stars using radial velocities , and found that lithium remains undepleted for cluster stars with I > 17.54 ± 0.14 and K s > 14.86 ± 0.12. From these results, several pre...
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A lithium depletion boundary is detected in HIP 112312 (GJ 871.1 A and B), a ∼ 12 Myr old pre-main sequence binary system. A strong (EW≈ 300 mÅ) Li 6708 Å absorption feature is seen at the secondary (∼M4.5) while no Li 6708 Å feature is detected from the primary (∼M4). The physical companionship of the two stars is confirmed from common proper motions. Current theoretical pre-main sequence evol...
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We show by detailed model computation how much the Pre-Main Sequence (PMS) Lithium depletion depends on the treatment of over-adiabaticity, by taking advantage of the results of new models by Montalbán et al., which apply different treatments of convection to non-grey PMS models. In order to reproduce both the PMS lithium depletion (inferred from the lithium depletion patterns in young open clu...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2010
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/711/1/303