Gamma Lyrae

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Star in the constellation Lyra

title: "Gamma Lyrae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["b-type-giants", "lyra", "bayer-objects", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects", "stars-with-proper-names"] description: "Star in the constellation Lyra" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Gamma_Lyrae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Lyra ::

| image = | image=Lyra IAU.svg | float=center | width=250 | position=right | mark=Red circle.svg | mark_width=10 | mark_link=γ Lyr | x%=45.4 | y%=52.4 | caption=Location of γ Lyrae | epoch = J2000 | ra = | dec = | appmag_v = 3.24 | constell = Lyra | class = B9 III | b-v = −0.04 | u-b = −0.125 | variable = | radial_v = −21.1 | prop_mo_ra = −3.09 | prop_mo_dec = +1.11 | parallax = 5.26 | p_error = 0.27 | parallax_footnote = | absmag_v = −3.14 | mass = | radius = | luminosity = | temperature = | metal_fe = +0.15 | rotation = | rotational_velocity = 65 | gravity = | age_myr = | names =

Gamma Lyrae, Latinised from γ Lyrae, and formally named Sulafat ,{{cite book |last1=Kunitzsch |first1=Paul |last2=Smart |first2=Tim |date = 2006 |edition = 2nd rev. |title = A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations |publisher = Sky Pub |location = Cambridge, Massachusetts |isbn = 978-1-931559-44-7

Nomenclature

γ Lyrae (Latinised to Gamma Lyrae) is the star's Bayer designation.

It bore the traditional names Sulafat (Sulaphat), from the Arabic السلحفاة al-sulḥafāt "turtle", and Jugum, from the Latin iugum "yoke". The connection with turtles is that fine harps were traditionally made of tortoiseshell. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN){{citation | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN) | publisher=International Astronomical Union | access-date=22 May 2016 | postscript=. | archive-date=30 March 2019 | archive-url=https://web.archive.org/web/20190330194042/https://www.iau.org/science/scientific_bodies/working_groups/280/ | url-status=dead

In Chinese astronomy, 漸台 (Jiāntāi), meaning Clepsydra Terrace, refers to an asterism consisting of this star, Delta2 Lyrae, Beta Lyrae and Iota Lyrae. Consequently, the Chinese name for Gamma Lyrae itself is 漸台三 (Jiāntāisān, ).

Properties

This is a giant star with a stellar classification of B9 III, indicating it has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The effective temperature of the outer envelope of this star is , giving it the blue-white hue typical of a B-type star. The interferometry-measured angular diameter of this star is , which, at its estimated distance, equates to a physical radius of roughly 15 times the radius of the Sun.

In 1909, Canadian astronomer Samuel A. Mitchell identified this star as a spectroscopic binary, although he was unable to split the absorption lines of the components. He found that a period of 25.6 days matched his measurements. It was reported as a spectroscopic binary as recently as 2001, but is now believed to be a single star with a high rate of rotation for stars of this type.

References

References

  1. "IAU Catalog of Star Names".
  2. {{in lang. zh [http://aeea.nmns.edu.tw/2006/0607/ap060703.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日] {{Webarchive. link. (2011-05-21)
  3. (2013). "Optical interferometry of early-type stars with PAVO@CHARA - I. Fundamental stellar properties". Monthly Notices of the Royal Astronomical Society.
  4. van Leeuwen, F.. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  5. (April 1986). "The chemical composition of algol systems. III - Beta Lyrae-nucleosynthesis revealed". [[Monthly Notices of the Royal Astronomical Society]].
  6. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal.
  7. (June 20–24, 1966). "Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30". International Astronomical Union.
  8. (1986). "UBV photometry of stars whose positions are accurately known. III". Astronomy and Astrophysics Supplement Series.
  9. "SULAFAT -- Star in double system". [[Centre de Données astronomiques de Strasbourg]].
  10. (October 1909). "Seven spectroscopic binaries". Astrophysical Journal.
  11. (1899). "Star-names and their meanings". G. E. Stechert.
  12. (February 2007). "Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars". The Astronomical Journal.
  13. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society.
  14. (June 2001). "Elemental abundance analyses with DAO spectrograms. XXV. The superficially normal B and A stars alpha Draconis, tau Herculis, gamma Lyrae, and HR 7926". Astronomy and Astrophysics.
  15. (2019). "Angular Sizes, Radii, and Effective Temperatures of B-type Stars from Optical Interferometry with the CHARA Array". The Astrophysical Journal.
  16. (December 21, 2004). "The Colour of Stars". [[Commonwealth Scientific and Industrial Research Organisation]].

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b-type-giantslyrabayer-objectsdurchmusterung-objectsflamsteed-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objectsstars-with-proper-names