Kinematics of OB-associations in the 3-kpc solar neighborhood

Авторы: Melnik A.M., Dambis A.K., Glushkova E.V., Rautiainen P.
Сборник: Origins: From the Protosun to the First Steps of Life
Серия: Proceedings of the International Astronomical Union
Том: 345
Год издания: 2020
Издательство: Cambridge University Press
Местоположение издательства: United Kingdom
Первая страница: 39
Последняя страница: 42
DOI: 10.1017/S1743921318008335
Аннотация: We use Gaia (DR1, DR2) stellar proper motions to study the kinematics of OB-associations. The average one-dimensional velocity dispersion inside 18 OB-associations with more than 10 Gaia DR1 stars is σv = 3.9 km s-1. The median virial and stellar masses of OB-associations are equal to 7×10^5 and 9 × 10^3 solar masses, respectively. The median star-formation efficiency is ∊ = 2.1%. We have found the expansion in several OB-associations. Models of the Galaxy with a two-component outer ring R1R2 can reproduce the average residual velocities of OB-associations in the Perseus, Sagittarius and Local System complexes.
Добавил в систему: Мельник Анна Маратовна

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