Unveiling the star formation history of the Upper Scorpius association through its kinematics

Squicciarini, Vito; Gratton, Raffaele; Bonavita, Mariangela; Mesa, Dino

doi:10.1093/mnras/stab2079

Title: Unveiling the star formation history of the Upper Scorpius association through its kinematics

Journal Article · Wed Jul 21 00:00:00 EDT 2021 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stab2079· OSTI ID:1814856

; Gratton, Raffaele;

; Mesa, Dino

Stellar associations can be discerned as overdensities of sources not only in the physical space but also in the velocity space. The common motion of their members, gradually eroded by the galactic tidal field, is partially reminiscent of the initial kinematic structure. Using recent data from Gaia EDR3, combined with radial velocities from GALAH and APOGEE, we traced back the present positions of stars belonging to Upper Scorpius (USCO), a subgroup of Scorpius–Centaurus, the nearest OB association. About one half of the subgroup (the ‘clustered’ population) appears composed of many smaller entities, which were in a more compact configuration in the past. The presence of a kinematic duality is reflected into an age spread between this younger clustered population and an older diffuse population, in turn confirmed by a different fraction f_D of disc-bearing stars (f_D = 0.24 ± 0.02 versus f_D = 0.10 ± 0.01). Star formation in USCO appears to have lasted more than 10 Myr and proceeded in small groups that, after a few Myr, dissolve in the field of the older population but retain for some time memory of their initial structure. The difference of ages inferred through isochrones and kinematics, in this regard, could provide a powerful tool to quantify the time-scale of gas removal.

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Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE

Contributing Organization:: Sloan Digital Sky Survey (SDSS)

OSTI ID:: 1814856

Alternate ID(s):: OSTI ID: 1982514

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 507 Journal Issue: 1; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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