HD 79447

HD 79447 is a single[8] star in the southern constellation of Carina. It has the Bayer designation i Carinae, while HD 79447 is the identifier from the Henry Draper catalogue. This star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.96.[2] It is located at a distance of approximately 540 light years from the Sun based on parallax,[1] and has an absolute magnitude of −2.14.[2] The star drifting further away with a radial velocity of +18 km/s.[2] It is a candidate member of the Lower Centaurus-Crux group of the Sco OB2 association.[9]

This article is about i Carinae. For I Carinae, see HD 90589. For ι Carinae, see Iota Carinae. For l Carinae, see HD 84810.
HD 79447
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 09h 11m 16.72089s[1]
Declination −62° 19′ 01.1295″[1]
Apparent magnitude (V) +3.96[2]
Characteristics
Spectral type B3V[3]
B−V color index −0.180±0.006[2]
Astrometry
Radial velocity (Rv)+17.5±2.7[2] km/s
Proper motion (μ) RA: −37.48[1] mas/yr
Dec.: +14.59[1] mas/yr
Parallax (π)6.01 ± 0.12[1] mas
Distance540 ± 10 ly
(166 ± 3 pc)
Absolute magnitude (MV)−2.14[2]
Details
Mass7.0±0.1[4] M☉
Radius5.6[5] R☉
Luminosity2,054.17[2] L☉
Surface gravity (log g)3.5±0.1[3] cgs
Temperature18,900±500[3] K
Rotational velocity (v sin i)0[6] km/s
Age39.2±7.0[4] Myr
Other designations
i Car, CPD−61°1201, GC 12707, HD 79447, HIP 45101, HR 3663, SAO 250471[7]
Database references
SIMBADdata

This object is a B-type main-sequence star with a stellar classification of B3V.[3] A surface magnetic field has been detected with a strength on the order of 1 kG.[9] It has an estimated age of around 39[4] million years with no measured spin rate.[6] The star has about 5.6[5] times the radius of the Sun and 7[4] times the Sun's mass. It is radiating over two thousand[2] times the luminosity of the Sun from its photosphere at an effective temperature of 18,900 K.[3]

References
  1. van Leeuwen, F. (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. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015
  3. Levenhagen, R. S.; Leister, N. V. (2006), "Spectroscopic analysis of southern B and Be stars", Monthly Notices of the Royal Astronomical Society, 371: 252, arXiv:astro-ph/0606149, Bibcode:2006MNRAS.371..252L, doi:10.1111/j.1365-2966.2006.10655.x.
  4. 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:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  6. Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
  7. "HD 79447". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-25.
  8. Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925–1929, arXiv:1205.5238, Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x.
  9. Neiner, Coralie; et al. (November 2015), "Discovery of two new bright magnetic B stars: i Car and Atlas", Monthly Notices of the Royal Astronomical Society: Letters, 454 (1): L56–L60, arXiv:1508.06784, Bibcode:2015MNRAS.454L..56N, doi:10.1093/mnrasl/slv128.
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