NGC 5822

NGC 5822
NGC 5822 (taken from Stellarium)
Observation data (J2000 epoch)
Right ascension15h 4m 21.(2)s
Declination−54° 23′ 5(8)″
Distance2,682 ly (822.3 pc)
Apparent magnitude (V)6.5
Physical characteristics
Mass~1.7×103 M☉
Radius26.1 ± 1.3 ly (8.0 ± 0.4 pc)
Estimated age900±100 Myr
Other designationsNGC 5822, Cr 289, ESO 176-SC 009
Associations
ConstellationLupus
See also: Open cluster, List of open clusters

NGC 5822 is an open cluster of stars in the southern constellation of Lupus. It was discovered by English Astronomer John Herschel on July 3, 1836, and lies close to another cluster, NGC 5823, which suggests there may be a physical association.

NGC 5822 is an intermediate age cluster, estimated at around 900 million years old, and it is located nearby at a distance of 2,700 light years. The Trumpler class of this cluster is III 2m. It is richly populated with half the cluster members lying within an angular radius of 22.1′. The cluster is considered low mass at ~1,700 times the mass of the Sun. It has a core radius of 1.1±0.1 pc and a limiting radius of 8.0±0.4 pc.

Measuring the abundances of a set of F-type stars that are probable members demonstrates the cluster metallicity is very similar to the Sun. It displays an extended main sequence turnoff on the Hertzsprung–Russell diagram, most likely due to differences in stellar rotation. Two barium stars have been identified in NGC 5822, making it only the second cluster shown to host these objects as of 2013.

References

  1. 1 2 3 4 5 Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics. 633: 22. arXiv:1911.07075. Bibcode:2020A&A...633A..99C. doi:10.1051/0004-6361/201936691. S2CID 208138247. A99.
  2. 1 2 Seligman, Courtney. "NGC Objects: NGC 5800 - 5849". Celestial Atlas. Retrieved 2021-12-29.
  3. 1 2 3 4 Sun, Weijia; et al. (May 2019). "Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822". The Astrophysical Journal. 876 (2): 9. arXiv:1904.03547. Bibcode:2019ApJ...876..113S. doi:10.3847/1538-4357/ab16e4. S2CID 102350601. 113.
  4. 1 2 Bonatto, C.; Bica, E. (July 2005). "Detailed analysis of open clusters: A mass function break and evidence of a fundamental plane". Astronomy and Astrophysics. 437 (2): 483–500. arXiv:astro-ph/0503589. Bibcode:2005A&A...437..483B. doi:10.1051/0004-6361:20042516. S2CID 18070831.
  5. 1 2 3 Carraro, Giovanni; et al. (October 2011). "A UBVI and uvbyCaHβ Analysis of the Intermediate-age Open Cluster, NGC 5822". The Astronomical Journal. 142 (4): 18. arXiv:1108.0587. Bibcode:2011AJ....142..127C. doi:10.1088/0004-6256/142/4/127. S2CID 119099798. 127.
  6. ↑ "NASA/IPAC Extragalactic Database". Results for NGC 5749. Retrieved 2007-04-06.
  7. ↑ "NGC 5822". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-12-29.
  8. ↑ Bruck, Mary T.; et al. (1968). "Three-colour photometry of southern galactic clusters IV: NGC 5822, 5823". Publications of the Royal Observatory, Edinburgh. 6 (9): 209–223. Bibcode:1968PROE....6..210B.
  9. 1 2 Dawson, D. W. (November 1978). "DDO photometry of giants in four southern open clusters". Astronomical Journal. 83: 1424–1429. Bibcode:1978AJ.....83.1424D. doi:10.1086/112334.
  10. ↑ Katime Santrich, O. J.; et al. (August 2013). "Two Barium Stars in the Open Cluster NGC 5822". The Astronomical Journal. 146 (2): 12. Bibcode:2013AJ....146...39K. doi:10.1088/0004-6256/146/2/39. 39.