Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576...43j&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Astronomy and Astrophysics
Astronomy
Gaia, Photometry, Galactic Astronomy, Stellar Classification
Scientific paper
If unsupported by appropriate diagnostic data, Gaia would yield immense numbers of positions and velocities of objects whose astrophysical nature would be unknown. The core science case requires measurement of luminosity, effective temperature, mass, age and chemical composition for the stellar populations in the Galaxy and its nearest neighbours. These quantities can be derived from the spectral energy distribution of the stars, i.e. through high-quality multi-band photometry. The current proposals for broad and medium band photometric systems, their capabilities for the astrophysical parametrization of the stars and hence the expected precision of the stellar populations characterization are reviewed.
Høg Erik
Jordi Carme
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