Gamma Camelopardalis

Gamma Camelopardalis, Latinized from γ Camelopardalis, is a suspected wide binary star^[11] system in the northern circumpolar constellation of Camelopardalis. With a visual magnitude of 4.66,^[3] it is faintly visible to the naked eye. Based upon an annual parallax shift of 9.09 mas as seen from Earth,^[1] this star is located about 359 light years from the Sun.

Gamma Camelopardalis

Location of γ Cam (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	03h 50m 21.50892s[1]
Declination	+71° 19′ 56.148″[1][2]
Apparent magnitude (V)	4.66[3] + 9.07[4]
Characteristics
Spectral type	A2 IVn[5]
U−B color index	+0.07[3]
B−V color index	+0.03[3]
Astrometry
Radial velocity (Rv)	0.2±2.5[6] km/s
Proper motion (μ)	RA: +18.17[1] mas/yr Dec.: −42.85[1] mas/yr
Parallax (π)	9.09 ± 0.18 mas[1]
Distance	359 ± 7 ly (110 ± 2 pc)
Absolute magnitude (MV)	−0.62[7]
Details
γ Cam A
Mass	2.98±0.04[8] M☉
Radius	2.5[9] R☉
Luminosity	185[8] L☉
Temperature	8,892[8] K
Rotational velocity (v sin i)	205[10] km/s
Other designations
γ Cam, BD+70°259, FK5 138, GC 4557, HD 23401, HIP 17959, HR 1148, SAO 5006, CCDM 03504+7120[2]
Database references
SIMBAD	data

The brighter primary, designated component A, is a white-hued A-type subgiant star with a stellar classification of A2 IVn.^[5] It is spinning rapidly with a projected rotational velocity of 205 km/s. This is giving the star an oblate shape with an equatorial bulge that is 17% larger than the polar radius.^[10] It has about three^[8] times the mass of the Sun and 2.5^[9] times the Sun's radius. The star is radiating 185^[8] times the Sun's luminosity from its photosphere at an effective temperature of 8,892 K.^[8]

The magnitude 9.07 secondary, BD+70 260, designated component C, lies at an angular separation of 106.00 arc seconds along a position angle of 85°, as of 2011. Component B is a magnitude 12.40 visual companion at a separation of 56.30 arc seconds along position angle 247°.^[4]

References

1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
2. "gam Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-08.
3. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
4. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
5. 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.
6. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
7. 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.
8. Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
9. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
10. van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
11. 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.

External links

• HR 1148
• Image Gamma Camelopardalis