Gaia's view of the λ Boo star puzzle
Article
Article Title | Gaia's view of the λ Boo star puzzle |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Murphy, Simon J. (Author) and Paunzen, Ernst (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 466 (1), pp. 546-555 |
Number of Pages | 10 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stw3141 |
Web Address (URL) | https://academic.oup.com/mnras/article/466/1/546/2638376 |
Abstract | The evolutionary status of the chemically peculiar class of λ Boo stars has been intensely debated. It is now agreed that the λ Boo phenomenon affects A stars of all ages, from star formation to the terminal age main sequence, but the cause of the chemical peculiarity is still a puzzle. We revisit the debate of their ages and temperatures in order to shed light on the phenomenon, using the new parallaxes in Gaia Data Release 1 with existing Hipparcos parallaxes and multicolour photometry. We find that no single formation mechanism is able to explain all the observations, and suggest that there are multiple channels producing λ Boo spectra. The relative importance of these channels varies with age, temperature and environment. |
Keywords | Accretion; Accretion discs; Asteroseismology; Circumstellar matter; ISM: clouds; Stars: chemically peculiar; Stars: distances; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Sydney |
Masaryk University, Czech Republic | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73qx/gaia-s-view-of-the-boo-star-puzzle
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