Structure of the Draco Dwarf Spheroidal Galaxy

Details Structure of the Draco Dwarf Spheroidal Galaxy Structure of the Draco Dwarf Spheroidal Galaxy

2002-01-17

arxiv.org/abs/astro-ph/0201297v1

Astronomical Journal, 123, 2511 (2002)

Astronomy and Astrophysics

Astrophysics

25 pages, 11 figures, 3 tables. Accepted for publication in AJ

Scientific paper

10.1086/339698

This article studies the structure of the Draco dwarf spheroidal galaxy with an emphasis on the question of whether the spatial distribution of its stars has been affected by the tidal interaction with the Milky Way, using R- and V-band CCD photometry for eleven fields. The article reports coordinates for the center, a position angle of the major axis, and the ellipticity. It also reports the results of searches for asymmetries in the structure of Draco. These results, and searches for a ``break'' in the radial profile and for the presence of principal sequences of Draco in a color-magnitude diagram for regions more than 50 arcmin from the center, yield no evidence that tidal forces from the Milky Way have affected the structure of Draco.

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