Lithium abundance in cluster giants - Constraints on meridional circulation transport on the main sequence

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168172· OSTI ID:7193995

Charbonneau, P; Michaud, G; Proffitt, C R ^[1]

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1. Montreal Universite (Canada)

The observed Li abundances in giants are used here to constrain meridional circulation transport on the main sequence. It is shown how meridional circulation, operating over the main-sequence lifetime, can lead to Li depletion in the upper radiative envelope and eventually to extreme Li underabundance in first-ascent giants, following convective dilution on the lower giant branch. In the mass range 1.2-2.0 solar, stars with equatorial rotational velocities greater than 30-35 km/s on the ZAMS should destroy most of their Li. These result are compared to recent Li abundance determination in three moderately old clusters, NGC 7789, NGC 752, and M67. Reasonably good agreement is found with data on M67 and NGC 752, but surprising disagreement with data on NGC 7789 is found. Possible explanations are considered. 60 refs.

• OSTI ID: 7193995
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 347; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALI METALS
ANGULAR MOMENTUM
ATMOSPHERES
CARBON 13
CARBON ISOTOPES
CHEMICAL COMPOSITION
ELEMENT ABUNDANCE
ELEMENTS
EVEN-ODD NUCLEI
GIANT STARS
ISOTOPES
LIGHT NUCLEI
LITHIUM
MAIN SEQUENCE STARS
MASS TRANSFER
MATHEMATICAL MODELS
METALS
MOTION
NUCLEI
ROTATION
STABLE ISOTOPES
STAR CLUSTERS
STAR EVOLUTION
STAR MODELS
STARS
STELLAR ATMOSPHERES