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J. Jugaku (Res. Inst. of Civilization, Tokai U., Japan), Y. Kan-ya (NAO, Japan), M.Y. Fujimoto (Hakkaido U., Japan), T.C. Beers (Michigan State U.)
Deep objective-prism surveys are able to identify a number of interesting stars in the halo of the Milky Way galaxy, including metal-deficient stars, field horizontal-branch stars and halo blue stragglers, and carbon-enhanced metal-deficient stars. We have used the Kiso Schmidt telescope (with a 2 degree prism, resulting in a dispersion of 100 Å/mm at ~4000 Å\ ), and a 2K x 2K CCD detector, in combination with the HK filter previously used by Beers and colleagues for an extensive photographic prism survey, to obtain objective-prism spectra which reach an apparent magnitude limit of B ~18.5 over roughly a one square degree area of sky in the direction toward the High Velocity HI cloud A1.
We discuss the results of our first test frames, and suggest a number of interesting candidate stars for further study at high spectral resolution. Field horizontal-branch stars identified in this study will be used to derive distance limits for the HVC A1, once the required high-dispersion spectra are obtained. Other High Velocity HI Clouds are presently being surveyed with this technique.
This work has received partial support from grant AST 95-29454 awarded by the National Science Foundation.
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