ESA ESTEC, Directorate Sci, Operat Dept, Miss Operat Div, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands,European Space Research and Technology Centre (ESA/ESTEC)
Klioner, S. A. (författare)
Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany,Dresden University of Technology
Lammers, U. (författare)
ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain,European Space Astronomy Centre
Lindegren, L. (författare)
Lund University,Lunds universitet,Astronomi,Institutionen för astronomi och teoretisk fysik,Naturvetenskapliga fakulteten,Lund Observatory,Department of Astronomy and Theoretical Physics,Faculty of Science
Luri, X. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain,University of Barcelona
CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France,National Centre for Space Studies (CNES)
Pourbaix, D. (författare)
Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium;FRS FNRS, Rue Egmont 5, B-1000 Brussels, Belgium,Belgian National Fund For Scientific Research (FNRS),Free University of Brussels (ULB)
Randich, S. (författare)
INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy,INAF - Osservatorio Astrofisico di Arcetri
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain,University of Barcelona
Guerra, R. (författare)
ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain,European Space Astronomy Centre
Holl, B. (författare)
Lund University,Lunds universitet,Institutionen för astronomi och teoretisk fysik,Naturvetenskapliga fakulteten,Department of Astronomy and Theoretical Physics,Faculty of Science,University of Geneva
Masana, E. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain,University of Barcelona
Messineo, R. (författare)
ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy,ALTEC S.p.A.
Uppsala universitet,Teoretisk astrofysik,Observationell astrofysik
Krone-Martins, A. (författare)
Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal
Lanzafame, A. C. (författare)
Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy;INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy
Lebzelter, T. (författare)
Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy;INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy
Alvarez, M. A. (författare)
Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain
Alvarez, R. (författare)
ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain
Alves, J. (författare)
Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
Anderson, R. I. (författare)
European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland
Andrei, A. H. (författare)
Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France;ON MCTI BR, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil;OV UFRJ BR, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, Brazil
Anglada Varela, E. (författare)
ESA ESAC, ATG Europe, Camino Bajo Castillo S-N, Madrid 28692, Spain
Antiche, E. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain
Antoja, T. (författare)
ESA ESTEC, Directorate Sci, Sci Support Off, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands;Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain
Arcay, B. (författare)
Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain
Astraatmadja, T. L. (författare)
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany;Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd,NW, Washington, DC 20015 USA
Bach, N. (författare)
ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain
Baker, S. G. (författare)
Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England
Balaguer-Nunez, L. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain
Balm, P. (författare)
ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain
Lund University,Lunds universitet,Institutionen för astronomi och teoretisk fysik,Naturvetenskapliga fakulteten,Department of Astronomy and Theoretical Physics,Faculty of Science
Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary;Eotvos Lorand Univ, Egyet Ter 1-3, H-1053 Budapest, Hungary
Julbe, F. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain
Univ Ljubljana, Fac Math & Phys, Jadranska Ulica 19, Ljubljana 1000, Slovenia;Villanova Univ, Dept Astrophys & Planetary Sci, 800 Lancaster Ave, Villanova, PA 19085 USA
Kohley, R. (författare)
ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain
Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
Marconi, M. (författare)
INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy
Marinoni, S. (författare)
INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy
Marschalko, G. (författare)
Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary;Univ Szeged, Baja Observ, Szegedi Ut II 70, H-6500 Baja, Hungary
Marshall, D. J. (författare)
Univ Paris Diderot, Lab AIM, IRFU Serv Astrophys, CEA DSM CNRS, Bat 709,CEA Saclay, F-91191 Gif Sur Yvette, France
Martino, M. (författare)
ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy
Marton, G. (författare)
Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
Tel Aviv Univ, Sch Phys & Astron, IL-6997801 Tel Aviv, Israel
McMillan, P. J. (författare)
Lund University,Lunds universitet,Astronomi,Institutionen för astronomi och teoretisk fysik,Naturvetenskapliga fakulteten,Lund Observatory,Department of Astronomy and Theoretical Physics,Faculty of Science
Messina, S. (författare)
INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy
Michalik, D. (författare)
Lund University,Lunds universitet,Astronomi,Institutionen för astronomi och teoretisk fysik,Naturvetenskapliga fakulteten,Lund Observatory,Department of Astronomy and Theoretical Physics,Faculty of Science
Millar, N. R. (författare)
Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
Molina, D. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain
Molinaro, R. (författare)
INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy
Molnar, L. (författare)
Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
Montegriffo, P. (författare)
INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy
Mor, R. (författare)
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Solano, E. (författare)
ESA ESAC, Dept Astrofis, Ctr Astrobiol, CSIC INTA, Camino Bajo Castillo S-N, Madrid 28692, Spain;ESA ESAC, INSA, Camino Bajo Castillo S-N, Madrid 28692, Spain
Context. Gaia Data Release 2 provides high-precision astrometry and three-band photometry for about 1.3 billion sources over the full sky. The precision, accuracy, and homogeneity of both astrometry and photometry are unprecedented. Aims. We highlight the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagram (HRD). Gaia allows us to present many different HRDs, depending in particular on stellar population selections. We do not aim here for completeness in terms of types of stars or stellar evolutionary aspects. Instead, we have chosen several illustrative examples. Methods. We describe some of the selections that can be made in Gaia DR2 to highlight the main structures of the Gaia HRDs. We select both field and cluster (open and globular) stars, compare the observations with previous classifications and with stellar evolutionary tracks, and we present variations of the Gaia HRD with age, metallicity, and kinematics. Late stages of stellar evolution such as hot subdwarfs, post-AGB stars, planetary nebulae, and white dwarfs are also analysed, as well as low-mass brown dwarf objects. Results. 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. Conclusions. 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.
NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)
ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)