Английская Википедия:Boötes I

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Шаблон:Infobox Galaxy

The Boötes Dwarf Galaxy (Boo I dSph) is a galaxy discovered in 2006, which appears faint, with a luminosity of Шаблон:Solar luminosity and an absolute magnitude of –5.8. It lies about Шаблон:Convert away in the constellation Boötes. This dwarf spheroidal galaxy appears to be tidally disrupted[1] by the Milky Way Galaxy, which it orbits, and has two stellar tails that cross over to form a cross.Шаблон:Citation needed Tidally disrupted galaxies usually only form one tail.Шаблон:Citation needed The galaxy appears to be significantly elongated, with an ellipticity of Шаблон:Nowrap.[2]

Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than the Rigel system (absolute magnitude –7.84).[3] Even so, it is one of the more luminous UFDs.[4] It is metal-poor, like other UFDs, with a mean metallicity of −2.34.[4]

The stellar population of Boötes I is mostly very old stars. The two populations have essentially the same age, 13.4 billion and 13.3 billion years, respectively, with most of the stars being of the latter population.[5]

Notes

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  1. Шаблон:Note labelApparent magnitude = Absolute magnitude + Distance modulus = –5.8[1] + 18.9[1] = 13.1

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References

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External links


Шаблон:Milky Way Шаблон:Boötes Шаблон:Sky