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51 Andromedae

Red giant star in the constellation Andromeda

Red giant star in the constellation Andromeda

| b-v = +1.28 | u-b = +1.44 | display-authors=1 | journal=The Astronomical Journal Simbad=HD+9927 }}

51 Andromedae, abbreviated 51 And and formally named Nembus , is the 5th brightest star in the northern constellation of Andromeda, very slightly dimmer than the Andromeda Galaxy also being of 4th magnitude. It is an orange K-type giant star with an apparent magnitude of +3.57 and is about 169 light-years from the Earth/solar system. It is traditionally depicted as one of the two northern, far upper ends of the mythological, chained-to-the-rocks princess, the other being binary star system Gamma Andromedae.

At an estimated age of 1.7 billion years, this is an evolved red giant star with a stellar classification of K3- III CN0.5. The suffix notation indicates a mild enhancement of cyanogen absorption lines in its spectrum. This star has 1.8 times the mass of the Sun and it has expanded to 21.3 times the Sun's radius. It is radiating 142 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,951 K.

Nomenclature

51 Andromedae is the star's Flamsteed designation. Ptolemy included this star in Andromeda in the Almagest. It was for a time moved into the greater form of Perseus envisioned by Johann Bayer as Upsilon Persei. Flamsteed oversaw its constellation reverting and the International Astronomical Union (IAU) made his 51 Andromedae its official designation in 1930.{{Cite book |author-link=Richard Hinckley Allen

The star bore the name Nembus, of undetermined origin and meaning,{{Cite book |author-link=Richard Hinckley Allen

In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of 51 Andromedae, Gamma Andromedae, Phi Persei, 49 Andromedae, Chi Andromedae, Upsilon Andromedae, Tau Andromedae, 56 Andromedae, Beta Trianguli, Gamma Trianguli and Delta Trianguli. Consequently, the Chinese name for 51 Andromedae itself is 天大將軍三 (Tiān Dà Jiāng Jūn sān, .)

References

References

  1. {{cite constellation. 51 And
  2. {{cite DR2
  3. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues.
  4. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series.
  5. (2013). "The metallicity signature of evolved stars with planets". Astronomy & Astrophysics.
  6. "HD 9927".
  7. "Naming Stars". IAU.org.
  8. Wagman, Morton (2003) ''Lost Stars'' p.240, McDonald and Woodward, Blacksburg, Virginia. {{ISBN. 0-939923-78-5.
  9. [http://www.lindahall.org/services/digital/ebooks/bayer/ Scans of the plates of ''Uranometria'' by J. Bayer, 1603] {{webarchive. link. (August 7, 2008 @Linda Hall Library)
  10. [http://www.ianridpath.com/startales/andromeda.htm Scan of the plates of ''Uranographia'' by J.E. Bode, 1801] @Ian Ridpath's ''Star Tales''
  11. "IAU Working Group on Star Names (WGSN)".
  12. {{in lang. zh ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN. 978-986-7332-25-7.
  13. (1932). "Ephemerides – Report of Commissions". Transactions of the International Astronomical Union.
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