Photometry for Stars in the Direction of HVCs


The Galactic high-velocity clouds (HVCs) trace a variety of energetic phenomena in the Milky Way, including the accretion of low-metallicity gas, tidal interactions and the circulation of gas between disk and halo. We have a program aiming at determining their distances, which requires identifying candidate BHB and RR Lyrae stars at distances bracketing the cloud's distances and then obtaining intermediate resolution classification spectra and photometry of these stars, in order to properly classify them and derive accurate distances. We have a list of 1200 candidate stars with spectra, with photometry for about 800 of those. Or WIYN 0.9m program aims at obtaining UBV photometry for the missing cases.

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Hillary Mathis, Site Manager
WIYN 0.9m Observatory
950 N. Cherry Ave.
Tucson, AZ 85719
E-mail: hmathis@noao.edu
Telephone: (520) 318-8460
Fax: (520) 318-8417


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