Iota Canis Majoris

Iota Canis Majoris (ι Canis Majoris, ι CMa) is a variable supergiant star in the constellation Canis Major.

ι Canis Majoris
Location of ι Canis Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 06h 56m 08.22413s[1]
Declination −17° 03′ 15.2675″[1]
Apparent magnitude (V) 4.40[2] (4.36 - 4.40[3])
Characteristics
Spectral type B3 Ib[4]
U−B color index −0.74[5]
B−V color index −0.07[5]
Variable type Beta Cephei?[2]
Astrometry
Radial velocity (Rv)+41.20[6] km/s
Proper motion (μ) RA: −3.56 ± 0.17[1] mas/yr
Dec.: +2.42 ±0.20[1] mas/yr
Parallax (π)1.04 ± 0.20[1] mas
Distanceapprox. 3,100 ly
(approx. 1,000 pc)
Absolute magnitude (MV)−5.51[7]
Details
Mass12.5[8] M☉
Radius25.9[7] R☉
Luminosity47,000[7] L☉
Surface gravity (log g)2.60[9] cgs
Temperature17,000[9] K
Metallicity [Fe/H]−0.17[10] dex
Rotational velocity (v sin i)27 ± 4[9] km/s
Age14.8[8] Myr
Other designations
20 Canis Majoris, HR 2596, HD 51309, BD−16°1661, FK5 2536, HIP 33347, SAO 152126, GC 9107
Database references
SIMBADdata

Iota Canis Majoris is a blue-white B-type supergiant with an apparent magnitude that varies between +4.36 and +4.40.[3] It has been classified as a Beta Cephei type variable star,[3] but the supergiant spectral type and a period of over a month mean it is no longer considered to be of that type.[2] It is approximately 3,100 light years from Earth. This star has 24.9 times the radius of the Sun.

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
  2. Stankov, Anamarija; Handler, Gerald (2005). "Catalog of Galactic β Cephei Stars". The Astrophysical Journal Supplement Series. 158 (2): 193–216. arXiv:astro-ph/0506495. Bibcode:2005ApJS..158..193S. doi:10.1086/429408. ISSN 0067-0049.
  3. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1: 02025. Bibcode:2009yCat....102025S.
  4. Prinja, R. K.; Massa, D. L. (2010). "Signature of wide-spread clumping in B supergiant winds". Astronomy and Astrophysics. 521: L55. arXiv:1007.2744. Bibcode:2010A&A...521L..55P. doi:10.1051/0004-6361/201015252. ISSN 0004-6361.
  5. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737.
  7. Balona, L. A.; Engelbrecht, C. A. (1985). "Photometry and frequency analysis of line profile variables". Monthly Notices of the Royal Astronomical Society. 214 (4): 559. Bibcode:1985MNRAS.214..559B. doi:10.1093/mnras/214.4.559.
  8. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  9. Lefever, K.; Puls, J.; Morel, T.; Aerts, C.; Decin, L.; Briquet, M. (2010). "Spectroscopic determination of the fundamental parameters of 66 B-type stars in the field-of-view of the CoRoT satellite". Astronomy and Astrophysics. 515: A74. arXiv:0910.2851. Bibcode:2010A&A...515A..74L. doi:10.1051/0004-6361/200911956.
  10. Gies, Douglas R.; Lambert, David L. (1992). "Carbon, nitrogen, and oxygen abundances in early B-type stars". Astrophysical Journal. 387: 673. Bibcode:1992ApJ...387..673G. doi:10.1086/171116.
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