E. Kontizas

Gaia Data Release 2

A. Helmi, F. van Leeuwen, P. J. McMillan, D. Massari et autres

0

nl, gb, se, es, fr, de, it, ch, be, gr, us (code pays fourni par la source)

Gaia Data Release 2

A. Helmi, F. van Leeuwen, P. J. McMillan, D. Massari et autres

0

nl, gb, se, es, fr, de, it, ch, be, gr, us (code pays fourni par la source)

Gaia Data Release 2. Mapping the Milky Way disc kinematics

D. Katz, T. Antoja, M. Romero-Gómez, R. Drimmel et autres

Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than G(RVS) = 12 mag. Both samples provide a full sky coverage. Aims. …

de (code pays fourni par la source)

Gaia Data Release 2. Observational Hertzsprung-Russell diagrams

C. Babusiaux, F. van Leeuwen, M. A. Barstow, C. Jordi et autres

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 …

de (code pays fourni par la source)

Gaia Data Release 2. Observations of solar system objects

F. Spoto, P. Tanga, F. Mignard, J. Berthier et autres

CONTEXT: The Gaia spacecraft of the European Space Agency (ESA) has been securing observations of solar system objects (SSOs) \nsince the beginning of its operations. Data Release 2 (DR2) contains the observations of a selected sample of 14,099 SSOs. These \nasteroids have …

Gaia Data Release 2: Observational Hertzsprung-Russell diagrams

Gaia Collaboration, C. Babusiaux, F. van Leeuwen, M. A. Barstow et autres

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 …

fr, gb, it, ch, be, es, se (code pays fourni par la source)

Gaia Data Release 1

F. van Leeuwen, A. Vallenari, C. Jordi, L. Lindegren et autres

Context. The first Gaia Data Release contains the Tycho - Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using H ipparcos and Tycho-2 …

Gaia Data Release 1

F. van Leeuwen, A. Vallenari, C. Jordi, L. Lindegren et autres

Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using Hipparcos and Tycho-2 positions in 1991.25 …

nl, gb, it, es, se, de, fr, ch, be, lu, ru, dk, gr, il (code pays fourni par la source)

The Gaia mission

T. Prusti, J. H. J. de Bruijne, A. G. A. Brown, A. Vallenari et autres

Gaia is a cornerstone mission in the science programme of the EuropeanSpace Agency (ESA). The spacecraft construction was approved in 2006, following a study in which the original interferometric concept was changed to a direct-imaging approach. Both the spacecraft and the payload …

nl, it, fr, de, gb, ch, es, se, be, dk, gr (code pays fourni par la source)

Young stellar structures in four nearby galaxies

P. Drazinos, A. Karampelas, E. Kontizas, M. Kontizas et autres

A cluster finding method was developed and applied in four Local Group Galaxies (SMC, M31, M33 and NGC 6822). The aim is to study the young stellar population of these galaxies by identifying stellar structures in small and large scales. Also our …

Star forming regions with indication of hierarchical structure in a sample of spiral galaxies .

P. Drazinos, E. Kontizas, A. Karampelas, M. Kontizas et autres

Age – metallicity relation in the Magellanic Clouds clusters

E. Livanou, A. Dapergolas, M. Kontizas, B. Nordström et autres

Aims. We study small open star clusters, using Strömgren photometry to investigate a possible dependence between age and metallicity in the Magellanic Clouds (MCs). Our goals are to trace evidence of an age metallicity relation (AMR) and correlate it with the mutual …

gr, dk, es, ar (code pays fourni par la source)