Delta Leonis

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δ Leonis
Location of δ Leonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 14m 06.50142s[1]
Declination 20° 31′ 25.3853″[1]
Apparent magnitude (V) 2.56[2]
Characteristics
Spectral type A4 V[3]
U−B color index +0.12[4]
B−V color index +0.12[4]
Variable type
Delta Scuti
Distance
58.4 ± 0.3 ly
(17.91 ± 0.08 pc)
Absolute magnitude (MV)+1.29[5]
Details
Gyr
HR 4357, SAO 81727[11]
Database references
SIMBADdata

Delta Leonis (δ Leonis, abbreviated Delta Leo, δ Leo), also named Zosma /ˈzɒzmə/,[12][13] is a star in the zodiac constellation of Leo. Based upon parallax measurements, it lies at a distance of about 58.4 light-years (17.9 parsecs) from the Sun.[1]

Properties

δ Leonis is a

remnant white dwarf consisting of carbon and oxygen.[6]

This star is rotating rapidly, with a

oblate spheroidal shape. The polar radius is about 84% of the radius along the equator.[9]

Based upon the location and trajectory of this star through space, it may be a member of the

Ursa Major Moving Group, a type of stellar kinematics group that share a common origin and motion through space.[14] The age of this group is about 500 million years.[15]

Nomenclature

δ Leonis (Latinised to Delta Leonis) is the star's Bayer designation.

It bore the traditional names Zosma or Zozma and Duhr (rare spellings included Zozca, Zosca, Al-Zubra الزبرة, traditional Arabic for both shoulder, and a

Working Group on Star Names (WGSN)[16] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[17]
included a table of the first two batches of names approved by the WGSN, which included Zosma for this star.

In

Chinese name for δ Leonis itself is 太微右垣五 (Tài Wēi Zuǒ Yuán wu, English: the Fifth Star of Right Wall of Supreme Palace Enclosure),[19] representing 西上相 (Xīshǎngxiāng), meaning The First Western Minister.[20] 西上相 (Xīshǎngxiāng), spelled Shang Seang by R.H. Allen,[10] means "the Higher Minister of State".[10]

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1999VeARI..35....1W
  3. ^
    doi:10.1086/110819
  4. ^
    Bibcode:1966CoLPL...4...99J
  5. S2CID 119257644
    .
  6. ^
    University of Illinois, archived
    from the original on July 10, 2010, retrieved 2010-05-12
  7. ^
    S2CID 12033751
  8. Bibcode:1990A&AS...85.1015M
  9. ^
    S2CID 14070763
  10. ^ a b c d Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 260
  11. Centre de Données astronomiques de Strasbourg
    , retrieved 2010-05-12
  12. Bibcode:1944PA.....52....8D
    .
  13. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  14. doi:10.1088/0004-6256/140/3/713
  15. doi:10.1086/368241
  16. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  17. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  18. ISBN 978-986-7332-25-7
    .
  19. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived August 19, 2010, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  20. ^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived August 10, 2010, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
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