1 Camelopardalis
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Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Camelopardalis |
1 Cam | |
Right ascension | 04h 32m 01.842s[1] |
Declination | +53° 54′ 39.04″[1] |
Apparent magnitude (V) | 5.78 |
1 Cam A | |
Right ascension | 04h 32m 01.845s[2] |
Declination | +53° 54′ 39.03″[2] |
Apparent magnitude (V) | 5.77[2] |
1 Cam B | |
Right ascension | 04h 32m 00.915s[2] |
Declination | +53° 54′ 45.35″[2] |
Apparent magnitude (V) | 6.803[2] |
Characteristics | |
1 Cam A | |
Spectral type | O9.7IIn[3] |
U−B color index | −0.73[4] |
B−V color index | +0.18[4] |
Variable type | SPB?[5] |
1 Cam B | |
Spectral type | B1IV:[6] |
U−B color index | −0.70[4] |
B−V color index | +0.16[4] |
Astrometry | |
Radial velocity (Rv) | -7 km/s |
Proper motion (μ) | RA: ±1.20 −1.29[1] mas/yr Dec.: ±1.14 −0.17[1] mas/yr |
Parallax (π) | −4.60 ± 1.85[1] mas |
Absolute magnitude (MV) | −5.53[7] |
Details | |
Surface gravity (log g) | 3.70[8] cgs |
Temperature | 29,400[8] K |
Rotational velocity (v sin i) | 275[8] km/s |
Age | <20[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
1 Camelopardalis (1 Cam) is a triple star system in the constellation Camelopardalis. Its apparent magnitude is 5.77 and it is approximately 820 parsecs (2,700 ly) away.
The 1 Camelopardalis system is part of the Camelopardalis OB1 stellar association, which is 820 pc away. Three components stars are moving together through space.[9] 1 Camelopardalis A is a hot massive star which has evolved away from the main sequence to become a giant. 1 Camelopardalis B is 10" away and is probably an early B class subgiant. 1 Camelopardalis C is an 11th magnitude star 150" away.[10]
1 Camelopardalis A is a variable star with a small amplitude. It has a likely period of 0.22132 days and is thought to be a β Cephei variable or slowly pulsating B-type star.[11] Hipparcos photometry shows an amplitude of 0.035 magnitudes.[12] It has a rotational velocity of 275 km/s, one of the highest known.[8]
References
- 1 2 3 4 5 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. Vizier catalog entry
- 1 2 3 4 5 6 "The Tycho-2 catalogue of the 2.5 million brightest stars". Bibcode:2000A&A...355L..27H.
- ↑ Sota, A; Apellániz, J. Maíz; Morrell, N. I; Barbá, R. H; Walborn, N. R; Gamen, R. C; Arias, J. I; Alfaro, E. J (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement Series. 211: 10. arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10.
- 1 2 3 4 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ↑ Lutz, T. E; Lutz, J. H (1977). "Spectral classification and UBV photometry of bright visual double stars". The Astronomical Journal. 82: 431. Bibcode:1977AJ.....82..431L. doi:10.1086/112066.
- 1 2 "The local system of early type stars - Spatial extent and kinematics". Bibcode:1985A&AS...60...99W.
- 1 2 3 4 Cazorla, Constantin; et al. (2017). "Chemical abundances of fast-rotating massive stars. I. Description of the methods and individual results". Astronomy and Astrophysics. 603: A56. arXiv:1703.05592. Bibcode:2017A&A...603A..56C. doi:10.1051/0004-6361/201629841.
- ↑ Straižys, V.; Laugalys, V. "Young Stars in the Camelopardalis Dust and Molecular Clouds. I. The Cam OB1 Association". arXiv:0803.2461. Bibcode:2007BaltA..16..167S.
- ↑ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ↑ Jerzykiewicz, M. "Three known and twenty-two new variable stars of early spectral type". Bibcode:1993A&AS...97..421J.
- ↑ Lefèvre, L; Marchenko, S. V; Moffat, A. F. J; Acker, A (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy & Astrophysics. 507 (2): 1141. Bibcode:2009A&A...507.1141L. doi:10.1051/0004-6361/200912304.