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 |
Distance | 179 ± 2 ly (54.8 ± 0.6 pc) |
Absolute magnitude (MV) | 1.68[2] |
Details | |
Mass | 2.01[6] M☉ |
Radius | 2.57+0.05 −0.17[1] R☉ |
Luminosity | 17.64[2] L☉ |
Surface gravity (log g) | 3.98[7] cgs |
Temperature | 7,700[7] K |
Metallicity [Fe/H] | +0.27[7] dex |
Rotational velocity (v sin i) | 75[8] km/s |
Age | 560[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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[]
- ^ a b c d e f g h 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.
- ^ a b c d e f 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.
- ^ 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
- ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- ^ a b 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, S2CID 119231169.
- ^ a b c d 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, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
- ^ a b c d 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.
- ^ a b 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, S2CID 14070763
- ^ a b "4 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-14.
- ^ a b 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, S2CID 14878976
- ^ 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, S2CID 2603568.
- ^ 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.
- ^ 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
External links[]
- Am stars
- Double stars
- Camelopardalis (constellation)
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- HR objects