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IC 1613
IC 1613 (also known as Caldwell 51) is an irregular dwarf galaxy in the constellation Cetus near the star 26 Ceti. It was discovered in 1906 by Max Wolf,〔 and is approaching Earth at 234 km/s.
IC 1613 is a member of our Local Group.〔 It has played an important role in the calibration of the Cepheid variable period luminosity relation for estimating distances.〔 Other than the Magellanic Clouds, it is the only Local Group dwarf irregular galaxy where RR Lyrae-type variables have been observed.〔
In 1999, Cole et al.〔 used the Hubble Space Telescope to find that the dominant population of this galaxy has an age of ~7 Gyr. Using its Hess diagram, they found that its evolutionary history may be similar to that of the Pegasus Dwarf Irregular Galaxy. Both galaxies are classified as Ir V in the DDO system. Also in 1999, Antonello et al. found five cepheids of Population II in IC 1613, giving self-evident support for the existence of a very old stellar population component of IC 1613. In 1999, King, Modjaz, & Li discovered the first nova ever detected in IC 1613.
==References==
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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