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The Magnificent Seven (neutron stars)
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The Magnificent Seven (neutron stars) : ウィキペディア英語版
The Magnificent Seven (neutron stars)
The Magnificent Seven is the informal name of a group of isolated young cooling neutron stars at a distance of 200 to 500 parsecs from Earth.〔Kaplan 2008〕 These objects are also known under the names XDINS (X-ray Dim Isolated Neutron Stars) and XTINS (X-ray Thermal Neutron Stars).
==History==
The first to fit this classification was RX J1856.5-3754, which was discovered by Walter et al. in 1992, and confirmed as a neutron star in 1996.〔Walter et al. 1996〕 The term ''Magnificent Seven'' was initially applied to the sources RX J1856.5-3754, RBS1556, RBS1223, RX J0806.4-4132, RX J0720.4-3125, RX J0420.0-5022 and MS 0317.7-6647.〔Treves et al. 2001〕 However, it was soon shown that MS 0317.7-6647 is, in fact, not a neutron star. Then in 2001 a new object fitting this classification was discovered: 1RXS J214303.7+065419/RBS 1774.〔Zampieri et al. 2001〕 Since 2001, no new good candidates have appeared. All seven sources were discovered by the ROSAT satellite.

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