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Tucana Dwarf
The Tucana Dwarf Galaxy is a dwarf galaxy in the constellation Tucana. It was discovered in 1990 by R.J. Lavery of Mount Stromlo Observatory. It is composed of very old stars and is very isolated from other galaxies. Its location on the opposite side of the Milky Way from other Local Group galaxies makes it an important object for study.
==Properties==
The Tucana Dwarf is a dwarf spheroidal galaxy of type dE5.〔 It contains only old stars, formed in a single star formation era around the time the Milky Way's globular clusters formed.〔 It is not experiencing any current star formation, unlike other isolated dwarf galaxies.〔
The Tucana Dwarf does not contain very much neutral hydrogen gas.〔 It has a metallicity of -1.8, a significantly low number. There is no significant spread in metallicity throughout the galaxy.〔 There does not seem to be any substructure to the stellar distribution in the galaxy.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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