HD 156091

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HD 156091
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 19m 12.50730s[1]
Declination −59° 41′ 40.5989″[1]
Apparent magnitude (V) 5.91[2] (5.91 + 13.00)[3]
Spectral type K2 IIICNIB/II[4]
B−V color index 1.37[2]
Radial velocity (Rv) −5.0±0.4[5] km/s
Proper motion (μ) RA: −3.15[1] mas/yr
Dec.: −8.05[1] mas/yr
Parallax (π) 1.31 ± 0.36[1] mas
Distance approx. 2,500 ly
(approx. 800 pc)
Mass 8.4±1.0[6] M
Luminosity 4,266[7] L
Temperature 4,306[7] K
Age 33.7±8.6[6] Myr
Other designations
CD-59° 6506, HD 156091, HIP 84731, HR 6408, SAO 244613.
Database references

HD 156091 is a double star in the southern constellation of Ara. The primary is a sixth magnitude giant star with stronger than normal lines of carbon, nitrogen, and barium in its spectrum.[8] The companion is a 13th magnitude star at an angular separation of 27.4 along a position angle of 275°, as of 2000.[3]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C. 
  3. ^ a b Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22 
  4. ^ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H. 
  5. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883Freely accessible, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ Keenan, Philip C.; Yorka, Sandra B.; Wilson, Olin C. (July 1987), "Recognition and classification of strong-CN giants", Publications of the Astronomical Society of the Pacific, 99: 629–636, Bibcode:1987PASP...99..629K, doi:10.1086/132025. 

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