Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20513506t&link_type=abstract
American Astronomical Society Meeting 205, #135.06; Bulletin of the American Astronomical Society, Vol. 36, p.1565
Astronomy and Astrophysics
Astronomy
Scientific paper
The Space Interferometry Mission's microarcsecond precision will provide exploration of parts of phase-space inaccessible to current planet search techniques. In particular, such precision would enable the discovery of extra-solar planets with sizes down to a few earth masses. In order to maximize SIM's astrometric accuracy, a network of about 4 to 5 reference stars needs to be identified for each of the target stars. It has been shown that K giants at about 1 kpc are the optimal stars for such a purpose because of their high intrinsic luminosity.
We have selected 40 candidate reference stars from the Tycho Catalog for each target star. To determine which 4-5 of these are most suitable to be observed by SIM as a reference star, we wish to determine the distance and metalicity of each. We present work done in calculating the gravity and metallicities via spectral synthesis modelling of candidate stars.
Fischer Debra
McCarthy Carolyn Cordwell
Tah K. L.
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