From Wikipedia, the free encyclopedia
Binary star system in the constellation Andromeda
π Andromedae in optical light Pi Andromedae (Pi And , π Andromedae , π And ) is the Bayer designation for a binary star [ 3] constellation of Andromeda . With an apparent visual magnitude of 4.4,[ 2] visible to the naked eye . It is located approximately 600 light-years (180 parsecs ) from Earth .
The pair is classified as a blue-white B-type main sequence dwarf , with an apparent magnitude of +4.34. It is a spectroscopic binary with an orbital period of 143.6 days and an eccentricity of 0.56. [ 3]
The spectroscopic binary forms a triple system with BD+32 102 , a magnitude 8.6 star located 35.9 arcseconds away.[ 3] arcseconds separation is an 11th magnitude companion that is just located on the same line of sight, but at a much different distance from us.
Naming
In Chinese , 奎宿 Kuí Sù Legs (asterism)η Andromedae , 65 Piscium , ζ Andromedae , ε Andromedae , δ Andromedae , ν Andromedae , μ Andromedae , β Andromedae , σ Piscium , τ Piscium , 91 Piscium , υ Piscium , φ Piscium , χ Piscium and ψ¹ Piscium . Consequently, the Chinese name for π Andromedae itself is 奎宿六 Kuí Sù liù the Sixth Star of Legs .)[ 8]
References
^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics . 474 (2): 653–664. arXiv :0708.1752 Bibcode :2007A&A...474..653V . doi :10.1051/0004-6361:20078357 . S2CID 18759600 . ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J . ^ a b c d e f Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society . 389 (2): 869–879. arXiv :0806.2878 Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x . S2CID 14878976 . {{cite journal }}: CS1 maint: unflagged free DOI (link )^ a b c d Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society 374 (2): 664–690, arXiv :astro-ph/0611618 Bibcode :2007MNRAS.374..664C , doi :10.1111/j.1365-2966.2006.11196.x , S2CID 119428437 . {{citation }}: CS1 maint: unflagged free DOI (link )^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication , Washington: Carnegie Institution of Washington, Bibcode :1953GCRV..C......0W . ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 . ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal , 573 (1): 359–365, Bibcode :2002ApJ...573..359A , doi :10.1086/340590 ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
External links
