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The Lithium Abundance and Mass Loss Rate in Galactic Super-Li-Rich Carbon and S Stars

Published online by Cambridge University Press:  25 May 2016

D. A. Lubowich ,
Verne V. Smith ,
B. E. Turner  and
R. Sahai
D. A. Lubowich
Affiliation:
Dept. of Physics, Hofstra U., Hempstead, NY & AIP, Melville, NY
Verne V. Smith
Affiliation:
Dept. of Physics, Univ. Texas El Paso, El Paso, TX
B. E. Turner
Affiliation:
National Radio Astronomy Observatory, Charlottesville, VA
R. Sahai
Affiliation:
Jet Propulsion Laboratory, Pasadena, CA

Abstract

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The super-Li-rich (SLR) stars are rare AGB stars containing enhanced Li/H ≈ 2000 times the ISM Li/H. In order to determine if mass loss from SLR stars is a significant source of ISM Li, we measured their Li/H and the mass loss rate. From the weak Li I 8126 Â line in 2/4 SLR C stars and 6/8 SLR S stars we obtained Li/H = (0.2 — 5) x 10—6 for SLR C stars and Li/H = (0.2 — 5) x 10—7 for the SLR S stars. We determined dM/dt from the expansion velocity and line profiles of the circumstellar CO. The dM/dt = 1.3 × 10—5M⊙/yr, 2.6 × 10—7M⊙/yr, and 2.6 × 10—8M⊙/yr for the C stars IY Hya, T Ara, and WZ Cas; and average dM/dt = 5.5 × 10—7M⊙/yr for the S stars. Thus mass loss from SLR stars is a significant source of Galactic Li.

Type
4. Lithium Abundances
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 377 - 378
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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