1 Camelopardalis
1 Camelopardalis (1 Cam) is a double star system in the constellation Camelopardalis. Its combined apparent magnitude is 5.56 and it is approximately 800 parsecs (2,600 ly) away.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Camelopardalis |
1 Cam | |
Right ascension | 04h 32m 01.842s[1] |
Declination | +53° 54′ 39.04″[1] |
Apparent magnitude (V) | 5.56[2] |
1 Cam A | |
Right ascension | 04h 32m 01.845s[3] |
Declination | +53° 54′ 39.03″[3] |
Apparent magnitude (V) | 5.77[3] |
1 Cam B | |
Right ascension | 04h 32m 00.915s[3] |
Declination | +53° 54′ 45.35″[3] |
Apparent magnitude (V) | 6.803[3] |
Characteristics | |
1 Cam A | |
Spectral type | O9.7IIn[4] |
U−B color index | −0.73[5] |
B−V color index | +0.18[5] |
Variable type | SPB?[6] |
1 Cam B | |
Spectral type | B1IV:[7] |
U−B color index | −0.70[5] |
B−V color index | +0.16[5] |
Astrometry | |
1 Cam A | |
Proper motion (μ) | RA: 2.990±0.135[8] mas/yr Dec.: −3.856±0.107[8] mas/yr |
Parallax (π) | 1.2967 ± 0.0908[8] mas |
Distance | 2,500 ± 200 ly (770 ± 50 pc) |
1 Cam B | |
Proper motion (μ) | RA: 0.844±0.091[9] mas/yr Dec.: −3.380±0.068[9] mas/yr |
Parallax (π) | 1.1724 ± 0.0639[9] mas |
Distance | 2,800 ± 200 ly (850 ± 50 pc) |
Absolute magnitude (MV) | −5.53[10] |
Details | |
1 Cam A | |
Surface gravity (log g) | 3.70[11] cgs |
Temperature | 29,400[11] K |
Rotational velocity (v sin i) | 275[11] km/s |
1 Cam B | |
Luminosity | 1,995[12] L☉ |
Temperature | 29,512[12] K |
Rotational velocity (v sin i) | 11[12] km/s |
Age | <20[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
1 Cam A | |
1 Cam B |
The 1 Camelopardalis system is part of the Camelopardalis OB1 stellar association, which is 820 pc away.[13] 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.
There is an 11th magnitude star 150" away.[14] It is unclear whether it is a member of a triple system,[13] or if the fainter star is only a foreground object lying in the same direction.[15]
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.[16] Hipparcos photometry shows an amplitude of 0.035 magnitudes.[17] It has a rotational velocity of 275 km/s, one of the highest known.[11]
References
- 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. Vizier catalog entry
- Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. 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 (1): 10. arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. S2CID 118847528.
- 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.
- 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.
- 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.
- Westin, T. N. G. (1985). "The local system of early type stars - Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99. Bibcode:1985A&AS...60...99W.
- 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. S2CID 59499133.
- Simón-Díaz, S.; Godart, M.; Castro, N.; Herrero, A.; Aerts, C.; Puls, J.; Telting, J.; Grassitelli, L. (2017). "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars". Astronomy and Astrophysics. 597: A22. arXiv:1608.05508. Bibcode:2017A&A...597A..22S. doi:10.1051/0004-6361/201628541. S2CID 3478126.
- Straižys, V.; Laugalys, V. (2007). "Young Stars in the Camelopardalis Dust and Molecular Clouds. I. The Cam OB1 Association". Baltic Astronomy. 16: 167–182. 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.
- 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.
- Jerzykiewicz, M. (1993). "Three known and twenty-two new variable stars of early spectral type". Astronomy and Astrophysics Supplement Series. 97: 421. 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.