Gaia Data Release 2. Observational Hertzsprung-Russell diagrams

0494614 - ASÚ 2019 RIV FR eng J - Journal Article
Babusiaux, C. - van Leeuwen, F. - Barstow, M.A. - Jordi, C. - Vallenari, A. - Bossini, D. - Bressan, A. - Cantat-Gaudin, T. - Koubský, Pavel - Votruba, Viktor … Total 452 authors
Gaia Data Release 2. Observational Hertzsprung-Russell diagrams.
Astronomy & Astrophysics. Roč. 616, August (2018), č. článku A10. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA MŠMT(CZ) LG15010
Grant - others:ESA(XE) ESA-PECS project no. 98058
Institutional support: RVO:67985815
Keywords : parallaxes * Hertzsprung-Russell and C-M diagrams * solar neighborhood
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.209, year: 2018

The Gaia HRDs are unprecedented in both precision and coverage of the various Milky Way stellar populations and stellar evolutionary phases. Many fine structures of the HRDs are presented. The clear split of the white dwarf sequence into hydrogen and helium white dwarfs is presented for the first time in an HRD. The relation between kinematics and the HRD is nicely illustrated. Two different populations in a classical kinematic selection of the halo are unambiguously identified in the HRD. Membership and mean parameters for a selected list of open clusters are provided. They allow drawing very detailed cluster sequences, highlighting fine structures, and providing extremely precise empirical isochrones that will lead to more insight in stellar physics. Gaia DR2 demonstrates the potential of combining precise astrometry and photometry for large samples for studies in stellar evolution and stellar population and opens an entire new area for HRD-based studies.
Permanent Link: http://hdl.handle.net/11104/0287723