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Paper: Chemical Abundances Along the Horizontal Branch
Volume: 336, COSMIC ABUNDANCES as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert
Page: 131
Authors: Behr, B.B.
Abstract: Horizontal-branch stars are tempting targets for chemical abundance analysis via high-resolution spectroscopy, as they are reasonably luminous and span a wide range of effective temperature, so that the absorption lines of many different chemical species can be observed. The cooler HB stars provide useful checkpoints for tracing the chemical evolution of low-mass stars between the red giant branch and asymptotic giant branch stages. The hotter HB stars, however, display surface abundances which are greatly altered by diffusion effects in their atmospheres. Although these abundance variations make it difficult (if not impossible) to assess the true abundance development of these stars, they provide interesting insights into atmospheric structure and dynamics.
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