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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.

1 Camelopardalis
Location of 1 Camelopardalis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
1 Cam A
Right ascension 04h 32m 01.841s[1]
Declination +53° 54′ 39.02″[1]
Apparent magnitude (V) 5.77[2]
1 Cam B
Right ascension 04h 32m 00.915s[3]
Declination +53° 54′ 45.35″[3]
Apparent magnitude (V) 6.803[2]
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: 2.775±0.051[1] mas/yr
Dec.: −3.783±0.041[1] mas/yr
Parallax (π)1.2630 ± 0.0486 mas[1]
Distance2,580 ± 100 ly
(790 ± 30 pc)
1 Cam B
Proper motion (μ) RA: 0.775±0.053[3] mas/yr
Dec.: −3.211±0.036[3] mas/yr
Parallax (π)1.1211 ± 0.0462 mas[3]
Distance2,900 ± 100 ly
(890 ± 40 pc)
Absolute magnitude (MV)−5.53[8]
Details
1 Cam A
Luminosity4,365[9] L☉
Surface gravity (log g)3.65[9] cgs
Temperature29,800[9] K
Rotational velocity (v sin i)275[10] km/s
1 Cam B
Luminosity1,995[11] L☉
Temperature29,512[11] K
Rotational velocity (v sin i)11[11] km/s
Age<20[8] Myr
Other designations
DL Camelopardalis, HR 1417, HD 28446, SAO 24672, BD+53°779, FK5 165,WDS J04320+5355, HIP 21148
Database references
SIMBADdata
1 Cam A
1 Cam B

The 1 Camelopardalis system is part of the Camelopardalis OB1 stellar association, which is 820 pc away.[12] 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.[13] It has been considered to be a member of a triple system,[12] but Gaia observations show it to be an unrelated background object.[14]

A light curve for DL Camelopardalis, plotted from TESS data[15]
A light curve for DL Camelopardalis, plotted from TESS data[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.[10]


References


  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. Holgado, G.; Simón-Díaz, S.; Haemmerlé, L.; Lennon, D. J.; Barbá, R. H.; Cerviño, M.; Castro, N.; Herrero, A.; Meynet, G.; Arias, J. I. (2020). "The IACOB project. VI. On the elusive detection of massive O-type stars close to the ZAMS". Astronomy and Astrophysics. 638: A157. arXiv:2005.05446. Bibcode:2020A&A...638A.157H. doi:10.1051/0004-6361/202037699. S2CID 218596165.
  10. 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.
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  16. 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.
  17. 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.

На других языках

[de] 1 Camelopardalis

1 Camelopardalis (kurz 1 Cam) ist ein lichtschwacher, mit dem bloßen Auge gerade noch sichtbarer, wohl optischer (nicht gravitativ gebundener) Doppelstern im Sternbild Giraffe (lateinisch Camelopardalis), der mit einer scheinbaren Gesamthelligkeit von 5,43m am Nachthimmel leuchtet. Die Entfernung der 5,78m hellen Hauptkomponente 1 Cam A zur Erde beträgt nach neuen, im Dezember 2020 veröffentlichten Auswertungen der Messergebnisse der Raumsonde Gaia etwa 2580 Lichtjahre.[1] Die Eigenbewegung des Hauptsterns wurde von Gaia zu 2,775 Millibogensekunden in Richtung Rektaszension und −3,783 Millibogensekunden in Richtung Deklination gemessen.[1] Sein 6,82m heller Begleiter 1 Cam B stand im Jahr 2018 etwa 10,4 Bogensekunden von ihm entfernt; der Winkelabstand der beiden Komponenten nahm damit in den letzten 200 Jahren um etwa 1,5 Bogensekunden ab.[6] Laut den Gaia-Messungen befindet sich der Begleitstern in ungefähr 2910 Lichtjahren Entfernung von der Erde und hat eine Eigenbewegung von 0,775 Millibogensekunden in Richtung Rektaszension sowie −3,211 Millibogensekunden in Richtung Deklination.[7] Interstellarer Staub schwächt das Licht der beiden Sterne um etwa 1,5 Größenklassen ab.[2]
- [en] 1 Camelopardalis


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