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Theia: Faint objects in motion or the new astrometry frontier
The Theia Collaboration, Celine Boehm, Alberto Krone-Martins +96
In the context of the ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study the motion of very faint…
On the Origin of Sub-subgiant Stars. I. Demographics
Aaron M. Geller, Emily M. Leiner, Andrea Bellini +8
Sub-subgiants are stars observed to be redder than normal main-sequence stars and fainter than normal subgiant (and giant) stars in an optical color-magnitude diagram. The red stra…
HST proper motions in Galactic globular clusters
Laura L. Watkins, Roeland P. van der Marel, Andrea Bellini +3
Proper motions (PMs) are crucial to fully understand the internal dynamics of globular clusters (GCs). To that end, the Hubble Space Telescope (HST) Proper Motion (HSTPROMO) collab…