53 Camelopardalis

53 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis,[7] located 290 light years away from the Sun as determined by parallax measurements.[1] It has the variable star designation AX Camelopardalis; 53 Camelopardalis is the Flamsteed designation.[7] This object is dimly visible to the naked eye as a white hued star with a baseline apparent visual magnitude of +6.02.[2] It is a single-lined spectroscopic binary[8] system with an orbital period of 6.63 years and a high eccentricity of 0.718.[6] The "a sin i" value of the primary is 280 Gm (1.9 AU), where a is the semimajor axis and i is the orbital inclination.[6]

53 Camelopardalis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension 08h 01m 42.43137s[1]
Declination +60° 19′ 27.8016″[1]
Apparent magnitude (V) 6.02[2] (6.3 + 7.5)[3]
Characteristics
Evolutionary stage main sequence
Spectral type A3VpSrSiCrEu[4]
B−V color index 0.158±0.005[2]
Variable type α2 CVn[5]
Astrometry
Radial velocity (Rv)−2.2[2] km/s
Proper motion (μ) RA: −21.367[1] mas/yr
Dec.: −26.386[1] mas/yr
Parallax (π)11.2327 ± 0.1547[1] mas
Distance290 ± 4 ly
(89 ± 1 pc)
Absolute magnitude (MV)1.05[2]
Orbit[6]
Period (P)2,422.04±2.42 d
Eccentricity (e)0.718±0.012
Periastron epoch (T)2,427,723.6±14.3 JD
Argument of periastron (ω)
(secondary)		5.22±1.64°
Semi-amplitude (K1)
(primary)		12.08±0.45 km/s
Details[6]
53 Cam A
Mass2.074±0.012 M☉
Radius2.36±0.10 R☉
Luminosity24.9±1.15 L☉
Surface gravity (log g)3.70±0.10 cgs
Temperature8,400±150 K
Rotation8.02681±0.00004 d
Rotational velocity (v sin i)12.5±0.5 km/s
Age615+56
−51 Myr
Other designations
53 Cam, AX Cam, BD+60°1105, FK5 302, GC 10822, HD 65339, HIP 39261, HR 3109, SAO 14402, CCDM 08017+6019, WDS J08017+6019[7]
Database references
SIMBADdata

The visible component is a well-studied magnetic Ap star[6] with a stellar classification of A3VpSrSiCrEu[4] and a visual magnitude of 6.3.[3] The magnetic field topology of 53 Camelopardalis is complex, and is accompanied by abundance variations across the surface of elements like silicon, calcium, titanium, iron, and neodymium.[6] It is classified as an Alpha2 Canum Venaticorum type variable star and the combined brightness of the system varies from magnitude +6.00 down to +6.05 with a rotationally-modulated period of 8.0278 days.[5]

The primary has 2.1 times the mass of the Sun and 2.4 times the Sun's radius. It is spinning with a projected rotational velocity of 12.5 km/s and a rotation period of 8.0268 days. The inclination angle of the pole is estimated to be 57°±5°. The star is about 615 million years old and is radiating 25 times the luminosity of the Sun from its photosphere at an effective temperature of 8,400 K.[6]

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, S2CID 119257644.
  3. Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement Series, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182
  5. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  6. Carrier, F.; et al. (October 2002), "Multiplicity among chemically peculiar stars. II. Cool magnetic Ap stars", Astronomy and Astrophysics, 394: 151–169, arXiv:astro-ph/0208082, Bibcode:2002A&A...394..151C, doi:10.1051/0004-6361:20021122, S2CID 14223227.
  7. "53 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-22.
  8. Kochukhov, O.; et al. (February 2004), "Magnetic Doppler imaging of 53 Camelopardalis in all four Stokes parameters", Astronomy and Astrophysics, 414 (2): 613–632, Bibcode:2004A&A...414..613K, doi:10.1051/0004-6361:20031595
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