Photometric Followup of Space Interferometry Mission Grid Giant Star Candidates

Details Photometric Followup of Space Interferometry Mission Grid Giant Star Candidates Photometric Followup of Space Interferometry Mission Grid Giant Star Candidates

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..222g&link_type=abstract

NOAO Proposal ID #2001A-0222

Astronomy and Astrophysics

Astronomy

Scientific paper

We have been awarded a NASA grant to obtain followup photometry (and spectroscopy) of the Grid Giant Star Survey (GGSS) candidates we are establishing in our Space Interferometry Mission (SIM) Preparatory Science program. The GGSS will yield ~ 4000 metal-poor G-K giants as SIM Astrometric Grid candidates, based on single-epoch photometry and low resolution spectroscopy. Multi-epoch photometric followup observations of these candidates are essential for verifying their photometric stability and thus guaranteeing their utility as SIM Astrometric Grid stars. Because the kinematic properties of these stars will eventually be determined to unprecedented accuracy, a detailed understanding of their characteristics will not only be important for the SIM project, but also crucial for future studies of the GGSS database. We propose here a longterm project to obtain part of the followup photometry required. These data will not only allow us to verify the photometric stability of the final candidates but establish the binary frequency of metal-poor giants as well as greatly improve our knowledge of the atmospheric parameters of the Grid stars. The T_eff provided will be critical for the chemical abundance analysis we will perform on the whole sample based on high resolution spectra being obtained at ESO. We will also obtain improved data, including temperature and metallicity information, for distant giants that are serendipitously identified in our survey, which can be used to probe the structure of the Milky Way to distances > 50 kpc.

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