HD 24479

HD 24479 is a single[9] star located in the constellation Camelopardalis. It is also known as HR 1204. The star is visible to the naked eye with an apparent visual magnitude of 4.95.[2] Based upon an annual parallax shift of 9.04±0.29 mas as seen from Earth's orbit,[1] it is located around 360 light years from the Sun.

HD 24479
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension  03h 57m 25.44380s[1]
Declination +63° 04′ 20.1442″[1]
Apparent magnitude (V) 4.95[2]
Characteristics
Spectral type B9 IV[3] or B9.5 V[4]
B−V color index −0.074±0.005[2]
Astrometry
Radial velocity (Rv)+4.6±2.8[5] km/s
Proper motion (μ) RA: +6.43[1] mas/yr
Dec.: +5.37[1] mas/yr
Parallax (π)9.04 ± 0.29[1] mas
Distance360 ± 10 ly
(111 ± 4 pc)
Absolute magnitude (MV)−0.27[2]
Details
Mass3.14±0.05[6] M☉
Radius3.1[7] R☉
Luminosity156+12
−11[6] L☉
Temperature10,520+73
−23[6] K
Rotational velocity (v sin i)95[6] km/s
Other designations
BD+62°628, FK5 2281, HD 24479, HIP 18505, HR 1204, SAO 12969[8]
Database references
SIMBADdata

In 1932, HD 24479 was identified as a Be star by Olin C. Wilson at the Mount Wilson Observatory.[10] In 1969, Cowley et al. listed a stellar classification of B9.5 V,[4] matching a B-type main-sequence star. Slettebak (1982) gave it a class of B9 IV,[3] suggesting this instead an evolving subgiant star. It has an estimated 3.14[6] times the mass of the Sun and about 3.1[7] times the Sun's radius. The star is radiating 156[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,520 K.[6]

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. Slettebak, A. (1982), "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars", Astrophysical Journal Supplement Series, 50: 55–83, Bibcode:1982ApJS...50...55S, doi:10.1086/190820, page 80.
  4. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  7. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (Third ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. "HD 24479". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-05-24.
  9. 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.
  10. Wilson, Olin C., Jr. (April 1932), "Three New Be Stars", Publications of the Astronomical Society of the Pacific, 44 (258): 124, Bibcode:1932PASP...44..124W, doi:10.1086/124211.
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