Astronomy: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 |
| 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 |
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
- ↑ 1.0 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.
- ↑ 2.0 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.
- ↑ 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
- ↑ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode: 1986EgUBV........0M
- ↑ 5.0 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.
- ↑ 6.0 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.
- ↑ 7.0 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.
- ↑ 8.0 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.
- ↑ 9.0 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.
- ↑ 10.0 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
- ↑ 11.0 11.1 "4 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Cam.
- ↑ 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.
- ↑ 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.
- ↑ 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
- ↑ 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.
- ↑ 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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