4 Camelopardalis

4 Camelopardalis is a binary star[10] in the northern constellation of Camelopardalis,[9] located 179 light years away from the Sun, based upon parallax.[1] With a combined apparent visual magnitude of 5.29,[2] it is visible to the naked eye as a faint, white-hued star. The pair have a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.158″ per year.[11] The system's proper motion makes it a candidate for membership in the IC 2391 supercluster.[12] They are moving away from the Earth with a heliocentric radial velocity of 22.5 km/s.[5]

4 Camelopardalis
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension  04h 48m 00.27362s[1]
Declination +56° 45′ 25.8410″[1]
Apparent magnitude (V) 5.29[2]
Characteristics
Spectral type A3m[3]
U−B color index 0.12[4]
B−V color index 0.246±0.003[2]
Astrometry
Radial velocity (Rv)+22.50±0.9[5] km/s
Proper motion (μ) RA: +52.538[1] mas/yr
Dec.: −140.874[1] mas/yr
Parallax (π)18.2460 ± 0.2083[1] mas
Distance179 ± 2 ly
(54.8 ± 0.6 pc)
Absolute magnitude (MV)1.68[2]
Details
Mass2.01[6] M☉
Radius2.57+0.05
−0.17[1] R☉
Luminosity17.64[2] L☉
Surface gravity (log g)3.98[7] cgs
Temperature7,700[7] K
Metallicity [Fe/H]+0.27[7] dex
Rotational velocity (v sin i)75[8] km/s
Age560[6] Myr
Other designations
4 Cam, BD+56°973, FK5 175, HD 30121, HIP 22287, HR 1511, SAO 24829[9]
Database references
SIMBADdata

The brighter member, designated component A, is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements.[13] It is an estimated 560[6] million years old and is spinning with a projected rotational velocity of 75[8] The star has 2.01[6] times the mass of the Sun and 2.57[1] times the Sun's radius. It is radiating 18[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,700 K.[7]

There is a faint, magnitude 9.49 companion at an angular separation of 0.610″ – component B; the pair most likely form a binary system.[10]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. 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
  4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. De Rosa, R. J.; et al. (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, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
  7. Takeda, Yoichi; et al. (October 2018), "Photospheric carbon, nitrogen, and oxygen abundances of A-type main-sequence stars*", Publications of the Astronomical Society of Japan, 70 (5): 91, arXiv:1807.06265, Bibcode:2018PASJ...70...91T, doi:10.1093/pasj/psy091, 91.
  8. Royer, F.; et al. (2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943
  9. "4 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-14.
  10. 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
  11. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
  12. Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal, 110: 2862, Bibcode:1995AJ....110.2862E, doi:10.1086/117734.
  13. Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788
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