{
  "id": "enwiki-001378475615",
  "slug": "phi-cassiopeiae",
  "title": "Phi Cassiopeiae",
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  "lead": "Phi Cassiopeiae is a multiple star system in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from φ Cassiopeiae, and abbreviated Phi Cas or φ Cas. With a combined apparent magnitude of +4.95, it is visible to the naked eye. The two brightest components are A and C, sometimes called φ 1 and φ 2 Cas. φ Cas A is an F0 bright supergiant of magnitude 5.11 and φ Cas C is a 7.08 magnitude B6 supergiant at 134\".",
  "body": "Phi Cassiopeiae is a multiple star system in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from φ Cassiopeiae, and abbreviated Phi Cas or φ Cas. With a combined apparent magnitude of +4.95, it is visible to the naked eye. The two brightest components are A and C, sometimes called φ 1 and φ 2 Cas. φ Cas A is an F0 bright supergiant of magnitude 5.11 and φ Cas C is a 7.08 magnitude B6 supergiant at 134\". ==System== (north is down).]] φ Cassiopeiae appears among the stars of the open cluster NGC 457, which located at a distance of , but it is uncertain whether φ Cas is a member of this cluster. φ Cas is generally treated as having five component stars, designated A to E in order of distance from the brightest star. The two components A and C are the brightest stars in the field of NGC 457; they are sometimes referred to as φ 1 and φ 2 Cassiopeiae. Component B is a 12th magnitude star 49\" from φ 1 . Components D and E and both 10th magnitude B-type main sequence stars in the field of NGC 457, with component E only 42\" from φ 2 . Another three components are sometimes listed as components of the multiple system, although this is somewhat arbitrary with dozens of members of NGC 457 being found within a few arc-minutes. The two supergiants, components A and C, share a similar space motion to the other stars in NGC 457, but their evolutionary status and brightness makes them unlikely members. Their Gaia Data Release 2 parallaxes are comparable to other stars in the cluster and consistent with the accepted distance of NGC 457, and component C has been given a 70% likelihood of being a member of the cluster. ==Properties== The primary component of the φ Cassiopeiae system is a very luminous yellow supergiant. Its absolute magnitude is comparable to some yellow hypergiants but it does not show the level of mass loss and instability that would qualify it as a hypergiant itself. Various model atmospheres all give a temperature around 7,300K, a low surface gravity, a radius around , and a luminosity well over . More uncertain is the mass, which would be expected to have been well over initially, but much less now. Different authors have published values from to . Component C is a relatively typical B class supergiant, 83,000 times the luminosity of the sun. It is a suspected variable and a suspected spectroscopic binary. ==See also== Rho Cassiopeiae ==References==",
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    "title": "Phi Cassiopeiae",
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