Publication details

Gaia's view of the lambda Boo star puzzle



Year of publication 2017
Type Article in Periodical
Magazine / Source Monthly Notices of the Royal Astronomical Society
MU Faculty or unit

Faculty of Science

Keywords accretion; accretion discs; asteroseismology; stars: chemically peculiar; circumstellar matter; stars: distances; ISM: clouds
Description The evolutionary status of the chemically peculiar class of. Boo stars has been intensely debated. It is now agreed that the. 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 lambda Boo spectra. The relative importance of these channels varies with age, temperature and environment.
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