Characterisation of young, nearby stars - The Ursa-Major group

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stars: Late-Type, Stars: Fundamental Parameters, Stars: Abundances, Galaxy: Solar Neigborhood, Galaxy: Open Clusters And Associations: Ursa Major Group

Scientific paper

The Ursa Major group is composed of the Ursa Major open star cluster in the Big Dipper constellation and of many co-moving stars spread over the whole sky. The stars of the Ursa Major group have a relatively young age of 200-600 million years. Taking into account their proximity and their common motion, the youth makes these stars interesting targets for various astrophysical studies. However the list of members is not complete. A few dozens of assured members face hundreds of additional candidates. Therefore the author considers the spectroscopic properties of the Ursa Major group on grounds of a precise analysis and indeed confirms that the stars have more features in common than just the motion.

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