Proper motions and bright-star photometry in the Ursa Minor dwarf galaxy

Details Proper motions and bright-star photometry in the Ursa Minor dwarf galaxy Proper motions and bright-star photometry in the Ursa Minor dwarf galaxy

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..766c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Oct. 1986, p. 766-776. Research supported by Rutgers University.

Astronomy and Astrophysics

Astronomy

30

Astrometry, Astronomical Photometry, Dwarf Galaxies, Galactic Structure, Stellar Motions, Astronomical Photography, Calibrating, Charge Coupled Devices, Color-Magnitude Diagram, Distance, Stellar Composition, X Ray Sources

Scientific paper

The authors present astrometry and photographic photometry of the central region of the Ursa Minor dwarf spheroidal galaxy. These studies, based on first-epoch Hale Observatory 5 m plates, second-epoch KPNO 4 m plates, and a photoelectric and CCD sequence, provide a color-magnitude diagram to mv ≡ 20.5, slightly below the horizontal branch. The well-known features of the Ursa Minor color-magnitude diagram, namely a steep, relatively blue giant branch, and a blue horizontal branch are shown. Evidence for a small population of red horizontal-branch stars is given. The RR Lyrae variables, anomalous Cepheids, and suprahorizontal-branch stars are all likely members, although one suprahorizontal-branch "star" is believed to be a QSO. This QSO may provide a satisfactory zero-proper-motion reference frame for third-epoch plates, and permit the orbit of Ursa Minor to be usefully constrained.

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