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Title: High-resolution spectroscopy of the extremely iron-poor post-AGB star CC Lyr
Authors: Aoki, W
Matsuno, Tadafumi
Honda, S
Parthasarathy, M
Li, Haining
Suda, T
Keywords: Circumstellar matter;Stars: abundances;Stars: AGB and post-AGB;Stars: individual (CC Lyr)
Issue Date: Apr-2017
Publisher: Published by Oxford University Press on behalf of the Astronomical Society of Japan
Citation: Publications of the Astronomical Society of Japan, Vol. 69, No. 2, 21
Abstract: High-resolution optical spectroscopy was conducted for the metal-poor post-AGB star CC Lyr to determine its chemical abundances and spectral line profiles. Our standard abundance analysis confirms its extremely low metallicity ([Fe/H] < −3.5) and a clear correlation between abundance ratios and the condensation temperature for 11 elements, indicating that dust depletion is the cause of the abundance anomaly of this object. The very low abundances of Sr and Ba, which are detected for the first time for this object, suggest that heavy neutron-capture elements are not significantly enhanced in this object by the s-process during its evolution through the AGB phase. The radial velocity of this object and profiles of some atomic absorption lines show variations depending on pulsation phases, which could be formed by dynamics of the atmosphere rather than by binarity or contributions of circumstellar absorption. On the other hand, the Hα emission with double peaks shows no evident velocity shift, suggesting that the emission is originating from the circumstellar matter, presumably the rotating disk around the object.
Description: Restricted Access
ISSN: 0004-6264
???metadata.dc.rights???: © Astronomical Society of Japan
Appears in Collections:IIAP Publications

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