Physics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724225c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #242.25; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
2
Scientific paper
We are using the Fine Guidance Sensors (FGS) on HST to obtain parallaxes of 9 metal-poor ([Fe/H] < -1.5) main sequence stars. The HST parallaxes are expected to have an accuracy of 0.2 mas (millisecond of arc), leading to absolute magnitude uncertainties of +/-0.05 mag for a given star. These stars will be used to test metal-poor stellar evolution models and to determine main sequence fitting distances to a large number of low metallicity globular clusters. FGS data has been obtained successfully for all stars during cycle 17 and will be complete at the end of cycle 18. ACS observations with the the F606W and F814W filters have been obtained for each star. ACS and ground based photometry is presented for the 9 stars. We are currently obtaining ground based high resolution spectra of all target stars which will be used to determine the composition of each star. A new grid of stellar evolution models and isochrones, which incorporate a range of different assumptions regarding the physics of stellar evolution, are currently being computed.
Benedict George F.
Chaboyer Brian C.
Feiden Greg
McArthur Barbara E.
McWilliam Andrew
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