Astronomy:4 Camelopardalis

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Short description: Probable multiple star system in the constellation Camelopardalis
4 Camelopardalis
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  04h 48m 00.2729s[1]
Declination +56° 45′ 25.837″[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: +52.892[1] mas/yr
Dec.: −140.618[1] mas/yr
Parallax (π)18.4464 ± 0.1109[1] mas
Distance177 ± 1 ly
(54.2 ± 0.3 pc)
Absolute magnitude (MV)1.68[2]
Orbit[6]
PrimaryAa
CompanionAb
Period (P)90 yr
Semi-major axis (a)0.503″
Eccentricity (e)0.87
Inclination (i)120.0°
Longitude of the node (Ω)54.5°
Argument of periastron (ω)
(secondary)		235.9°
Details
Mass2.01[7] M☉
Radius2.57+0.05
−0.17[8] R☉
Luminosity17.64[2] L☉
Surface gravity (log g)3.98[9] cgs
Temperature7,700[9] K
Metallicity [Fe/H]+0.27[9] dex
Rotational velocity (v sin i)75[10] km/s
Age560[7] Myr
Other designations
4 Cam, BD+56°973, FK5 175, HD 30121, HIP 22287, HR 1511, SAO 24829[11]
Database references
SIMBADdata

4 Camelopardalis is a probable multiple star in the northern constellation of Camelopardalis,[11] located 177 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.[12] The system's proper motion makes it a candidate for membership in the IC 2391 supercluster.[13] They are moving away from the Earth with a heliocentric radial velocity of 22.5 km/s.[5]

The brighter member, designated component A, is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements.[14] It is an estimated 560[7] million years old and is spinning with a projected rotational velocity of 75[10] The star has 2.01[7] times the mass of the Sun and 2.57[8] 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.[9]

There is a faint, magnitude 9.49 companion at an angular separation of 0.610″ – component B; the pair most likely form a binary systemwith a period of about 90 years.[6] There is also a 13th-magnitude visual companion 13″ away which shares a common proper motion and parallax.[15][6] Another listed companion, a 12th-magnitude star nearly 2′ away, is probably unrelated.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  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, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C 
  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. ↑ 5.0 5.1 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, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 6.2 Tokovinin, Andrei; Everett, Mark E.; Horch, Elliott P.; Torres, Guillermo; Latham, David W. (2019), "Speckle Observations and Orbits of Multiple Stars", The Astronomical Journal 158 (4): 167, doi:10.3847/1538-3881/ab4137, Bibcode: 2019AJ....158..167T. 
  7. ↑ 7.0 7.1 7.2 7.3 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, doi:10.1093/mnras/stt1932, Bibcode: 2014MNRAS.437.1216D. 
  8. ↑ 8.0 8.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  9. ↑ 9.0 9.1 9.2 9.3 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, doi:10.1093/pasj/psy091, 91, Bibcode: 2018PASJ...70...91T. 
  10. ↑ 10.0 10.1 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, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R 
  11. ↑ 11.0 11.1 "4 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Cam. 
  12. ↑ 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, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L. 
  13. ↑ Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal 110: 2862, doi:10.1086/117734, Bibcode: 1995AJ....110.2862E. 
  14. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R 
  15. ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  16. ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.



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