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- W4213010025 abstract "Our aim is to test the accretion scenario of lambda Boo stars. This model predicts that a binary system with two early-type stars passing through a diffuse cloud should both display the same superficial peculiarity. We carried out a detailed abundance determination of three multiple systems hosting a candidate lambda Boo star: the remarkable triple system HD 15164/65/65C and the binary systems HD 193256/281 and HD 198160/161. The abundance analysis of HD 15164/65/65C shows a clear lambda Boo object (HD 15165) and two objects with near solar composition (HD 15164 and 15165C). Notably, the presence of a lambda Boo star (HD 15165) together with a near solar early-type object (HD 15164) is difficult to explain under the accretion scenario. Also, the solar-like composition derived for the late-type star of the system (HD 15165C) could be used, for the first time, as a proxy for the initial composition of the lambda Boo stars. Then, by reviewing abundance analysis of all known binary systems with candidate lambda Boo stars from literature and including the systems analyzed here, we find no binary/multiple system having two clear bonafide lambda Boo stars, as expected from the accretion scenario. The closer candidates to show two lambda Boo-like stars are HD 84948, HD 171948 and HD 198160; however, in our opinion they show mild rather than clear lambda Boo patterns. Our results brings little support to the accretion scenario. Then, there is an urgent need of additional binary and multiple systemsto be analyzed through a detailed abundance analysis.[abridged]" @default.
- W4213010025 created "2022-02-24" @default.
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- W4213010025 date "2022-04-01" @default.
- W4213010025 modified "2023-10-06" @default.
- W4213010025 title "Testing the accretion scenario of <i>λ</i> Boo stars" @default.
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- W4213010025 doi "https://doi.org/10.1051/0004-6361/202243058" @default.
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