HD 79447

Last updated
HD 79447
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Carina [1]
Right ascension 09h 11m 16.72089s [2]
Declination −62° 19′ 01.1295″ [2]
Apparent magnitude  (V)+3.96 [1]
Characteristics
Spectral type B3V [3]
B−V color index −0.180±0.006 [1]
Astrometry
Radial velocity (Rv)+17.5±2.7 [1] km/s
Proper motion (μ)RA: −37.48 [2] mas/yr
Dec.: +14.59 [2] mas/yr
Parallax (π)6.01±0.12  mas [2]
Distance 540 ± 10  ly
(166 ± 3  pc)
Absolute magnitude  (MV)−2.14 [1]
Details
Mass 7.0±0.1 [4]   M☉
Radius 5.6 [5]   R☉
Luminosity 2,054.17 [1]   L☉
Surface gravity (log g)3.5±0.1 [3]   cgs
Temperature 18,900±500 [3]   K
Rotational velocity (v sin i)0 [6]  km/s
Age 39.2±7.0 [4]   Myr
Other designations
i Car, CPD−61°1201, GC 12707, HD 79447, HIP 45101, HR 3663, SAO 250471 [7]
Database references
SIMBAD data

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. [1] It is located at a distance of approximately 540  light years from the Sun based on parallax, [2] and has an absolute magnitude of −2.14. [1] The star drifted further away with a radial velocity of +18 km/s. [1] It is a candidate member of the Lower Centaurus–Crux group of the Sco OB2 association. [9]

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 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 18,900 K. [3]

References

  1. 1 2 3 4 5 6 7 8 9 10 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 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 .
  3. 1 2 3 4 5 Levenhagen, R. S.; Leister, N. V. (2006), "Spectroscopic analysis of southern B and Be stars", Monthly Notices of the Royal Astronomical Society, 371 (1): 252–262, arXiv: astro-ph/0606149 , Bibcode:2006MNRAS.371..252L, doi: 10.1111/j.1365-2966.2006.10655.x , S2CID   16492030.
  4. 1 2 3 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 , S2CID   118629873.
  5. 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv: astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID   425754.
  6. 1 2 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 , S2CID   119120749.
  9. 1 2 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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