Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..848..361n&link_type=abstract
RECENT ADVANCES IN ASTRONOMY AND ASTROPHYSICS: 7th International Conference of the Hellenic Astronomical Society. AIP Conferenc
Astronomy and Astrophysics
Astrophysics
Eclipsing Binaries, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Spectroscopy And Spectrophotometry
Scientific paper
GAIA, the approved cornerstone 6 ESA mission, will observe up to a billion stars in our Galaxy and obtain their astrometric positions on a micro-arcsec level, multi-band photometry as well as spectroscopic observations. The GAIA large-scale photometric survey will have significant intrinsic scientific value for the study of variable stars of nearly all types, including detached eclipsing binaries, near-contact or contact binaries and pulsating stars. It is expected that about 1 × 106 Eclipsing Binaries (EBs) (with V<= 16 mag) will be discovered and the observing fashion will be quite similar to Hipparcos/Tycho mission operational mode. On the other hand, GAIA's spectrograph will be able to secure useful radial velocities for binaries down to V~ 17 mag. The combined astrometric, photometric and spectroscopic data will be used to compute the physical parameters of the observed EBs. Even if for only 1% of the observed EBs reliable physical parameters could be derived, this would be a great contribution to stellar astrophysics and a giant leap in comparison with what has been obtained so far from ground-based observations. From a study of a small sample of EBs, it is shown that the agreement between the fundamental stellar parameters, derived from ground-based and Hipparcos (GAIA-like) observations, is more than satisfactory. The percentage difference between the absolute elements derived from GAIA-like observations and those from ground-based observations is of the order 2% or lower. These results are encouraging and demonstrate that GAIA data will be suitable to obtain accurate binary solutions.
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