The dwarf spheroidal galaxy in Draco. I - New BV photometry.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Electrophotometers, Galactic Structure, Stellar Spectrophotometry, Variable Stars, Astronomical Catalogs, Calibrating, Color-Magnitude Diagram, Frequency Distribution, Spheres, Star Distribution, Stellar Luminosity, Telescopes, Ubv Spectra

Scientific paper

BV photoelectric photometry for 39 stars and BV photographic photometry for 514 stars in the field of the Draco dwarf spheroidal galaxy are presented. The color-magnitude diagram for 512 of these field stars is found to display a well-defined red horizontal branch as well as a red giant branch whose observed width is comparable to the accidental photometric error. The results also indicate that a more diffuse sequence of stars lies about 0.1 mag to the blue of the giant branch and that an upper horizontal branch of more massive core helium-burning stars may also be present. The foreground reddening toward Draco is then determined by narrow-band uvby-beta photometry of galactic B-A-F stars.

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