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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| Distance | 177 ± 1 ly (54.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.68[2] |
| Orbit[6] | |
| Primary | Aa |
| Companion | Ab |
| 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 | |
| Mass | 2.01[7] M☉ |
| Radius | 2.57+0.05 −0.17[8] R☉ |
| Luminosity | 17.64[2] L☉ |
| Surface gravity (log g) | 3.98[9] cgs |
| Temperature | 7,700[9] K |
| Metallicity [Fe/H] | +0.27[9] dex |
| Rotational velocity (v sin i) | 75[10] km/s |
| Age | 560[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 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 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, arXiv:1908.11445, Bibcode:2019AJ....158..167T, doi:10.3847/1538-3881/ab4137, S2CID 201698428.
- ^ 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 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 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.
- ^ 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
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.