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.

wiyn visitor

Academic & Public

0.9m History

0.9m Location

Science Topics

0.9m Images

Telescope Images

0.9m Virtual Tour

Family Night

Undergrad Programs

Community Programs


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

wiyn footer
Anthony Petrie's index page Josh Schwartz's index page