The Distribution of Giant Stars in High Galactic Latitude Fields

Details The Distribution of Giant Stars in High Galactic Latitude Fields The Distribution of Giant Stars in High Galactic Latitude Fields

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30..770j&link_type=abstract

American Astronomical Society Meeting, 191, #131.02

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Scientific paper

As part of a continuing study (Majewski 1992, ApJSuppl, 78, 87, et seq.) of the space densities, kinematics and abundances of magnitude limited stellar samples in fields at high Galactic latitude, we have begun a CCD photometric survey aimed toward gaining leverage on the luminosity classes of our field stars. These data are critical to determining proper photometric parallaxes and, in turn, transverse velocities from the proper motions for our stars (previously we assumed all stars to be dwarfs, so that transverse velocities were underestimated for evolved stars). We make use of the intermediate band, DDO51 filter combined with the Washington filter system to distinguish giant from dwarf stars. Photometric data, good to V ~ 18, were obtained on the Burrell-Schmidt telescope for the fields SA28 (1 deg(2) ), SA57 (3 deg(2) ) and a field in Hercules (1 deg(2) ). From a similar survey conducted by us (see Ostheimer et al. poster) in other fields, but having spectroscopic follow-up to verify giant/dwarf discrimination, we have confidence in our ability to identify giants from the DDO51/Washington photometry alone. Therefore, we present a preliminary analysis of the spatial distribution of giants in these fields before the spectroscopic phase of the survey.

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