Delta Leonis

Zosma, δ Leo

Zosma is the δ star on the upper left of the map
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 14m 06.5013s[1]
Declination 20° 31′ 25.381″[1]
Apparent magnitude (V) 2.56 [1]
Characteristics
Spectral type A4 V [1]
U−B color index 0.12 [1]
B−V color index 0.12 [1]
Variable type Delta Scuti?
Astrometry
Radial velocity (Rv) -20.2 [1] km/s
Proper motion (μ) RA: 143.31 [1] mas/yr
Dec.: -130.43 [1] mas/yr
Parallax (π) 56.52 ± 0.83[2] mas
Distance 57.7 ± 0.8 ly
(17.7 ± 0.3 pc)
Absolute magnitude (MV) 1.29
Details
Mass 2.2 [3] M☉
Radius 2[3] R☉
Luminosity 23 [3] L☉
Temperature 8,350 [3] K
Metallicity ? Fe/H
Rotation 180 km/s[4] (<1/2 day)[3]
Age 6-7.5×108 [3] years
Other designations
Zosma, Zozma, Zosca, Duhr, Zubra, δ Leo, 68 Leo, HR 4357, BD +21°2298, HD 97603, SAO 81727, FK5 422, HIP 54872, Gl 419, GCTP 2614.00, GC 15438
Database references
SIMBAD data

Delta Leonis (δ Leo, δ Leonis) is a star in the constellation of Leo. It has the traditional names Zosma (or Zozma) and Duhr. Rare spellings include Zozca, Zosca, Zubra, and Dhur. The name Zosma means girdle in ancient Greek, referring to the star's location in its constellation, on the hip of the lion.

Contents

Properties

Zosma is a relatively ordinary main sequence star, although it is somewhat larger and hotter than the Sun. It is a fairly well-studied star, allowing relatively accurate measurements of its age and size. Having a larger mass than the Sun it will have a shorter lifespan, and in another 600 million years or so will swell into an orange or red giant star before decaying quietly into a white dwarf. The absolute magnitude of Zosma is 1.29 while its apparent magnitude is 2.56.

See also

References

  1. ^ a b c d e f g h i "SIMBAD query result: del Leo -- Variable Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=delta+leo&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. Retrieved 2010-05-12. 
  2. ^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E. et al (1997). "The HIPPARCOS Catalogue" (PDF). Astronomy and Astrophysics 323: L49–L52. Bibcode 1997A&A...323L..49P. 
  3. ^ a b c d e f Professor James B. (Jim) Kaler. "ZOSMA (Delta Leonis)". University of Illinois. http://stars.astro.illinois.edu/sow/zosma.html. Retrieved 2010-05-12. 
  4. ^ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere" (PDF). Astronomy and Astrophysics 393 (3): 897–911. arXiv:astro-ph/0205255. Bibcode 2002A&A...393..897R. doi:10.1051/0004-6361:20020943. 

External links

Stars of Leo
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