Xi Piscium
Binary star system in the constellation Pisces
Xi Piscium (ξ Piscium ) is an orange-hued binary star [ 8] system in the zodiac constellation of Pisces . In 1690, the astronomer Johannes Hevelius in his Firmamentum Sobiescianum regarded the constellation Pisces as being composed of four subdivisions. Xi Piscium was considered to be part of the Linum Austrinum , the South Cord.[ 9] The star is visible to the naked eye, having an apparent visual magnitude of 4.60.[ 2] Based upon an annual parallax shift of 11.67 mas as seen from Earth,[ 1] it is located about 280 light years from the Sun . It is moving away from the Sun, having a radial velocity of +26 km/s.[ 3]
This is a single-lined spectroscopic binary system with an orbital period of 4.6 years and an eccentricity of around 0.18.[ 5] The spectroscopic binary nature of this star was discovered in 1901 by William Wallace Campbell using the Mills spectrograph at the Lick Observatory .[ 10] The visible component is an evolved K-type giant star with a stellar classification of K0 III.[ 3] It is a red clump star, which indicates it is generating energy through helium fusion at its core.[ 11]
In non-Western astronomy
In Chinese astronomy , the "Outer Fence " (Chinese : 外屏 ; pinyin : Wài Píng ) refers to an asterism consisting of ξ Piscium, δ Piscium , ε Piscium , ζ Piscium , μ Piscium , ν Piscium and α Piscium . Consequently, the Chinese name for ξ Piscium itself is "the Sixth Star of the Outer Fence" (Chinese : 外屏六 ; pinyin : Wài Píng liù )[ 12]
References
^ a b c d e f van Leeuwen, F. (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 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society , 133 (4): 475–493, Bibcode :1966MNRAS.133..475A , doi :10.1093/mnras/133.4.475 .
^ a b c d e f g h Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal , 150 (3): 23, arXiv :1507.01466 , Bibcode :2015AJ....150...88L , doi :10.1088/0004-6256/150/3/88 , S2CID 118505114 , 88.
^ 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 .
^ a b Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics , 424 : 727–732, arXiv :astro-ph/0406573 , Bibcode :2004A&A...424..727P , doi :10.1051/0004-6361:20041213 , S2CID 119387088 .
^ a b c d Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal , 135 (1): 209–231, Bibcode :2008AJ....135..209M , doi :10.1088/0004-6256/135/1/209 .
^ "xi. Psc" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2017-07-25 .
^ Griffin, R. F.; Herbig, G. H. (1981), "Spectroscopic Orbits of Xi Piscium 60 Andromedae and ξ1 Ceti", Monthly Notices of the Royal Astronomical Society , 196 : 33–43, Bibcode :1981MNRAS.196...33G , doi :10.1093/mnras/196.1.33 .
^ Hevelius, J. (1690), Firmamentum Sobiescianum , Leipzig . Fix.NN
^ Campbell, William Wallace (1901), "Some recent results secured with the Mills spectrograph", Lick Observatory Bulletin , 1 (4): 22–25, Bibcode :1901LicOB...1...22C , doi :10.5479/ADS/bib/1901LicOB.1.22C .
^ Tautvaišienė, G.; et al. (December 2010), "C, N and O abundances in red clump stars of the Milky Way", Monthly Notices of the Royal Astronomical Society , 409 (3): 1213–1219, arXiv :1007.4064 , Bibcode :2010MNRAS.409.1213T , doi :10.1111/j.1365-2966.2010.17381.x , S2CID 119182458 .
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日