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NGC 6231
NGC 6231 (top) with Zeta2 and Zeta1 Scorpii (bottom)
Observation data (J2000.0 epoch)
Right ascension
16h 54m
Declination
−41° 48′
Distance
5,600±400 ly (1,700±130 parsec[1])
Apparent magnitude (V)
2.6
Apparent dimensions (V)
15.0′
Physical characteristics
Estimated age
2–7 million years[2][3]
Other designations
NGC 6171, Caldwell 76, Collinder 315, Melotte 153, De Cheseaux 9, Dunlop 499, Ha. I.7, Lacaille II.13
Associations
Constellation
Scorpius
See also: Open cluster, List of open clusters
NGC 6231 (also known as Caldwell 76 or the Baby Scorpion Cluster[4][5]) is an open cluster in the southern sky located half a degrees north of Zeta Scorpii. NGC 6231 is part of a swath of young, bluish stars in the constellation Scorpius known as the Scorpius OB1 association.[6] The star Zeta1 (HR 6262) is a member of this association, while its brighter apparent partner, Zeta2 (HR 6271), is only 150 ly from Earth and so is not a member.[citation needed]
This cluster is estimated to be about 2–7 million years old,[2][3] and is approaching the Solar System at 22 km/s. The cluster and association lie in the neighboring Sagittarius Arm of the Milky Way. Zeta1 Scorpii (spectral type O8 and magnitude 4.71.[7]) is the brightest star in the association, and one of the most radiant stars known in the galaxy.[8] NGC 6231 was used to measure the binary fraction of B-type stars: 52 ± 8%, indicating that B-type stars are commonly found in binary systems, but not as commonly as in O-type stars.[3]
NGC 6231 also includes three Wolf-Rayet stars: HD 151932, HD 152270,[9] and HD 152408.[10]
^
Kuhn, Michael A.; Hillenbrand, Lynne A.; Sills, Alison; Feigelson, Eric D.; Getman, Konstantin V. (2018). "Kinematics in Young Star Clusters and Associations with Gaia DR2". The Astrophysical Journal. 870 (1): 32. arXiv:1807.02115. Bibcode:2019ApJ...870...32K. doi:10.3847/1538-4357/aaef8c. S2CID 119328315.
^ abKuhn, M. A.; Medina, N.; Getman, K. V.; et al. (2017). "The Structure of the Young Star Cluster NGC 6231. I. Stellar Population". The Astronomical Journal. 154 (3): 87. arXiv:1706.00017. Bibcode:2017AJ....154...87K. doi:10.3847/1538-3881/aa76e8. S2CID 119435797.
^ abcBanyard, G.; Sana, H.; Mahy, L.; Bodensteiner, J.; Villaseñor, J. I.; Evans, C. J. (2022). "The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231". Astronomy & Astrophysics. 658: A69. arXiv:2108.07814. Bibcode:2022A&A...658A..69B. doi:10.1051/0004-6361/202141037. S2CID 237194742.
^Goldstein, Alan (2024-01-01). "NGC 6231". Astronomy Magazine. Retrieved 2024-06-10.
^Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
^Reipurth, B. (2008). "Young Stars in NGC 6231 and the Sco OB1 Association". In Reipurth, B. (ed.). Handbook of Star Forming Regions, Volume II: The Southern Sky ASP Monograph Publications. Vol. 5. Astronomical Society of the Pacific. p. 401. Bibcode:2008hsf2.book..401R. ISBN 978-1-58381-670-7.
^Sky Catalogue 2000.0
^Crossen & Tirion, Binocular Astronomy, p. 119.
^Shylaja, B. S (1988). "Study of the Wolf-Rayet members of the cluster NGC 6231". Journal of Astrophysics and Astronomy. 9 (3): 161–172. Bibcode:1988JApA....9..161S. doi:10.1007/BF02715061. S2CID 121125488.
^The distinction between OIafpe and WNLha stars. A spectral analysis of HD 151804, HD 152408 and HDE 313846.
NGC6231 (also known as Caldwell 76 or the Baby Scorpion Cluster) is an open cluster in the southern sky located half a degrees north of Zeta Scorpii....
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massive stars: observations centered on the Magellanic Cloud clusters NGC 330, NGC 346, NGC 2004, and the N11 region". Astronomy & Astrophysics. 456 (2): 623–638...
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