Astronomy:HD 79447

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Short description: Star in the constellation Carina
HD 79447
Observation data
Equinox J2000.0]] (ICRS)
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

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 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 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. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V, https://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A 
  3. 3.0 3.1 3.2 3.3 3.4 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, doi:10.1111/j.1365-2966.2006.10655.x, Bibcode2006MNRAS.371..252L. 
  4. 4.0 4.1 4.2 4.3 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode2011MNRAS.410..190T. 
  5. 5.0 5.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode2001A&A...367..521P. 
  6. 6.0 6.1 Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode1970crvs.book.....U. 
  7. "HD 79447". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+79447. 
  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, doi:10.1111/j.1365-2966.2012.21317.x, Bibcode2012MNRAS.424.1925C. 
  9. 9.0 9.1 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, doi:10.1093/mnrasl/slv128, Bibcode2015MNRAS.454L..56N.