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Omega Draconis

Star in the constellation Draco

Summary

Star in the constellation Draco

|b-v=+0.43 |u-b=−0.01 Omega Draconis, Latinized from ω Draconis and also known as 28 Draconis, is a binary star in the constellation of Draco. The system is fairly close, and is located about 78 light-years (24 parsecs) away, based on its parallax.

Omega Draconis is a spectroscopic binary, which means the two stellar components are too close to be resolved but periodic Doppler shifts in their spectra indicate orbital motion. In this case, light from both stars can be detected, and it is a double-lined spectroscopic binary. The orbital period of the system is 5.28 days, and the eccentricity of the system is 0.00220, implying a nearly circular orbit. The primary has a mass of , and is an F-type main-sequence star. The secondary is less massive, at .

Nomenclature

With 27 Draconis, it composed the Arabs' الأظفار الذئب al-ʼaẓfār al-dhiʼb, "the hyena's claws" in the asterism of the Mother Camels. The two stars have been distinguished as Adfar Aldib I (ω) and Adfar Aldib II (27 Draconis).

In Chinese, 尚書 (Shàng Shū), meaning Royal Secretary, refers to an asterism consisting of ω Draconis, 15 Draconis, 18 Draconis and 19 Draconis. Consequently, ω Draconis itself is known as 尚書一 (Shàng Shū yī, .).

References

References

  1. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory.
  2. (1957). "Distribution of the nearer bright stars in the color-luminosity array". The Astronomical Journal.
  3. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics.
  4. {{cite Gaia DR3. 1637717179389828224
  5. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  6. (2010). "High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027". The Astrophysical Journal.
  7. Allen, Richard Hinckley. (1899). "Star-Names and Their Meanings". G. E. Stechert.
  8. (November 15, 1971). "Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars". Jet Propulsion Laboratory, California Institute of Technology.
  9. [http://www.ianridpath.com/startales/draco.htm Ian Ridpath's Startales - Drco the Dragon]
  10. {{in lang. zh [http://aeea.nmns.edu.tw/2006/0606/ap060610.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 10 日] {{Webarchive. link. (2011-05-21)
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

draco-(constellation) f-type-main-sequence-stars bayer-objects spectroscopic-binaries hipparcos-objects flamsteed-objects henry-draper-catalogue-objects bright-star-catalogue-objects durchmusterung-objects gliese-and-gj-objects
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