15 Ursae Majoris

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15 Ursae Majoris
Observation data
Epoch {{{epoch}}}      Equinox
Constellation Ursa Major
Right ascension 09h 08m 52.25763s[1]
Declination +51° 36′ 16.7330″[1]
Spectral type A3 V[2]
Database references

15 Ursae Majoris (15 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 4.50.

15 UMi is Metallic-lined star, meaning it has unusually strong absorption lines of metals in its spectrum. Classification of the spectrum is difficult due to the peculiarities. An MK classification of 15 UMi using the Calcium K line is A3 V, but using metallic spectral lines it can appear as a cooler and more luminous star. Spectral lines in the blue region give a classification of F5 Ib, while in the violet region the lines suggest F5 III/IV.[2]


  1. ^ a b Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b Sreedhar Rao, S.; Abhyankar, K. D. (1991). "MK morphological study of AM stars at 66 A/mm". Journal of Astrophysics and Astronomy. 12 (2): 133. Bibcode:1991JApA...12..133S. doi:10.1007/BF02709302.