The lithium dip and Delta Scuti variables - Observational evidence, main-sequence mass loss and blue stragglers

Details The lithium dip and Delta Scuti variables - Observational evidence, main-sequence mass loss and blue stragglers The lithium dip and Delta Scuti variables - Observational evidence, main-sequence mass loss and blue stragglers

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..658k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 15, 1991, p. 658-661. ARCS Foundation, Inc.-

Astronomy and Astrophysics

Astronomy

5

Cepheid Variables, Dwarf Stars, Lithium, Stellar Evolution, Stellar Mass Ejection, Abundance, Blue Stars

Scientific paper

Implications of observational evidence on the recent suggestion that the lithium 'dip' seen in older galactic clusters is due to substantial main-sequence mass loss from Delta Sct stars are examined. Examination of evidence for such mass loss in Delta Sct stars, the relative locations of the instability strip and the lithium dip, and the implied mass-loss rates for a Delta Sct star to evolve down the main sequence to the lithium dip are all inconsistent with these pulsational variables being the progenitors of lithium dips. The lithium abundance determinations in blue stragglers and Delta Sct stars are still too few to make definitive statements as to the validity of the mass-loss hypothesis, but at present do not appear to favor this specific scenario. Because such abundance determinations are key tests of this hypothesis, more of them are needed to establish an informed opinion as to the tenability of the suggestion that Delta Sct stars are the progenitors of lithium dip stars.

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