Astronomy:HD 21447

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Short description: Probable binary star in the constellation Camelopardalis
HD 21447
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis[1]
Right ascension  03h 30m 00.18302s[2]
Declination +55° 27′ 06.5158″[2]
Apparent magnitude (V) 5.09[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A1 Va[4]
B−V color index 0.022±0.015[1]
Astrometry
Radial velocity (Rv)−1.9±0.9[5] km/s
Proper motion (μ) RA: −46.08[2] mas/yr
Dec.: −11.07[2] mas/yr
Parallax (π)16.42 ± 0.29[2] mas
Distance199 ± 4 ly
(61 ± 1 pc)
Absolute magnitude (MV)1.17[1]
Details
Mass2.32[6] M☉
Radius1.9[7] R☉
Luminosity32.16[1] L☉
Surface gravity (log g)4.06[8] cgs
Temperature10,049±342[8] K
Rotational velocity (v sin i)182[8] km/s
Age146[8] Myr
Other designations
NSV 1159, BD+54°684, HD 21447, HIP 16292, HR 1046, SAO 24064, WDS J03300+5527A[9]
Database references
SIMBADdata

HD 21447 is a probable binary star[10] system located in the constellation Camelopardalis. The star is also known as HR 1046. It can be viewed with the naked eye, having an apparent visual magnitude of 5.09.[1] Based upon an annual parallax shift of 16.42±0.29 mas,[2] it is located some 199 light years from the Sun. It is a candidate for membership in the Ursa Major Moving Group.[11]

The primary component is A-type main-sequence star with a stellar classification of A1 Va.[4] It is around 146[8] million years old and is spinning with a projected rotational velocity of 182 km/s.[8] The star has an estimated 2.32[6] times the mass of the Sun and about 1.9[7] times the Sun's radius. It is radiating around 32[1] times the Sun's luminosity from its photosphere at an effective temperature of 10,049 K.[8] The companion is visual magnitude 9.4 star at an angular separation of 14.8″.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  3. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement 65: 581, doi:10.1086/191237, Bibcode: 1987ApJS...65..581G. 
  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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  6. ↑ 6.0 6.1 De Rosa, R. J. et al. (January 2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society 437 (2): 1216–1240, doi:10.1093/mnras/stt1932, Bibcode: 2014MNRAS.437.1216D. 
  7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  9. ↑ "HD 21447". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+21447. 
  10. ↑ 10.0 10.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  11. ↑ King, Jeremy R. et al. (2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal 125 (4): 1980, doi:10.1086/368241, Bibcode: 2003AJ....125.1980K, https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=1248&context=physastro_pubs. 



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