Iota Canis Majoris

Iota Canis Majoris, Latinized from ι Canis Majoris, is a solitary[12] variable supergiant star in the southern constellation of Canis Major. It is visible to the naked eye with an apparent visual magnitude that varies between +4.36 and +4.40.[3] The distance to this star is approximately 3,100 light years based on parallax measurements. It is drifting further away with a radial velocity of +41.2 km/s.[7]

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] or B3 Ib/II[5]
U−B color index −0.74[6]
B−V color index −0.07[6]
Variable type Beta Cephei?[2]
Astrometry
Radial velocity (Rv)+41.20[7] 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 mas[1]
Distanceapprox. 3,100 ly
(approx. 1,000 pc)
Absolute magnitude (MV)−5.51[8]
Details
Mass12.5[9] M☉
Radius25.9[8] R☉
Luminosity47,000[8] L☉
Surface gravity (log g)2.60[10] cgs
Temperature17,000[10] K
Metallicity [Fe/H]−0.17[11] dex
Rotational velocity (v sin i)27±4[10] km/s
Age14.8[9] Myr
Other designations
ι CMa, 20 Canis Majoris, BD−16°1661, FK5 2536, GC 9107, HD 51309, HIP 33347, HR 2596, SAO 152126
Database references
SIMBADdata

Iota Canis Majoris is a massive blue-white B-type supergiant with a stellar classification of B3 Ib.[4] 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] This star is 14.8[9] million years old and is spinning with a projected rotational velocity of 27 km/s.[10] It has 12.5[9] times the mass and 25.9 times the radius of the Sun.[8] Iota Canis Majoris is radiating 47,000[8] times the luminosity of the Sun from its photosphere at an effective temperature of 17,000 K.[10]

The star displays a bow shock feature from its interaction with the interstellar medium, but this nebulosity is not aligned with the star's motion through the galaxy.[13]

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, S2CID 18759600
  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. S2CID 119526948.
  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. S2CID 59151633.
  5. Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
  6. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  7. 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. S2CID 119231169.
  8. 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.
  9. 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 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  10. 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. S2CID 54028925.
  11. 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.
  12. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  13. Bodensteiner, J.; Baade, D.; Greiner, J.; Langer, N. (October 2018). "Infrared nebulae around bright massive stars as indicators for binary interactions". Astronomy & Astrophysics. 618: 13. arXiv:1806.01294. Bibcode:2018A&A...618A.110B. doi:10.1051/0004-6361/201832722. S2CID 118972162. A110.
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