Gamma Lyrae

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Gamma Lyrae
Location of γ Lyrae
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 18h 58m 56.62241s[1]
Declination +32° 41′ 22.4003″[1]
Apparent magnitude (V) 3.261[2]
Characteristics
Spectral type B9 III[3]
U−B color index –0.125[2]
B−V color index –0.047[2]
Distance
620 ± 30 ly
(190 ± 10 pc)
Absolute magnitude (MV)−3.14[5]
Details
Rotational velocity (v sin i)
71–72[7] km/s
HR 7178, SAO 67663[8]
Database references
SIMBADdata

Gamma Lyrae,

interstellar dust.[6]

Nomenclature

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

It bore the traditional names Sulafat (Sulaphat), from the

Working Group on Star Names (WGSN)[12] to catalogue and standardize proper names for stars. The WGSN approved the name Sulafat for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[10]

In

Chinese name
for Gamma Lyrae itself is 漸台三 (Jiāntāisān, English: the Third Star of Clepsydra Terrace).

Properties

This is a

radius of the Sun.[17]

In 1909, Canadian astronomer

absorption lines of the components. He found that a period of 25.6 days matched his measurements.[18] It was reported as a spectroscopic binary as recently as 2001,[19] but is now believed to be a single star[20][21] with a high rate of rotation for stars of this type.[19]

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1986A&AS...65..405O
  3. ^
    doi:10.1086/110819
  4. Bibcode:1967IAUS...30...57E
  5. S2CID 119257644
    .
  6. ^
    S2CID 14624307
    .
  7. S2CID 14070763
  8. Centre de Données astronomiques de Strasbourg
    , retrieved 2012-01-12
  9. ISBN 978-1-931559-44-7
    .
  10. ^ a b "IAU Catalog of Star Names". Retrieved 28 July 2016.
  11. ^ Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 287
  12. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
  13. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日
  14. doi:10.1093/mnras/219.3.479
  15. Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original
    on 2012-03-18, retrieved 2012-01-16
  16. doi:10.1051/0004-6361:20042039
  17. ISBN 3-540-29692-1
    . The radius (R*) is given by:
  18. doi:10.1086/141699
  19. ^
    doi:10.1051/0004-6361:20010408
  20. S2CID 10416471
  21. S2CID 14878976

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Gamma_Lyrae&oldid=1179808501"