Astronomy:NGC 5822

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Short description: Open cluster in the constellation Lupus
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NGC 5822.png
NGC 5822 (taken from Stellarium)
Observation data (J2000 epoch)
ConstellationLupus
Right ascension 15h 4m 21.(2)s[1]
Declination−54° 23′ 5(8)″[1]
Distance2,682 ly (822.3 pc)[1]
Apparent magnitude (V)6.5[2]
Physical characteristics
Mass~1.7×103[3] M☉
Radius26.1 ± 1.3 ly (8.0 ± 0.4 pc)[4]
Estimated age900±100 Myr[5]
Other designationsNGC 5822, Cr 289, ESO 176-SC 009[6]
See also: Open cluster, List of open clusters

NGC 5822 is an open cluster of stars in the southern constellation of Lupus.[7] It was discovered by English Astronomer John Herschel on July 3, 1836,[2] and lies close to another cluster, NGC 5823, which suggests there may be a physical association.[8][9]

NGC 5822 is an intermediate age cluster, estimated at around 900 million years old, and it is located nearby[3] at a distance of 2,700 light years.[1] The Trumpler class of this cluster is III 2m.[9] It is richly populated[5] with half the cluster members lying within an angular radius of 22.1′.[1] The cluster is considered low mass at ~1,700 times the mass of the Sun.[3] It has a core radius of 1.1±0.1 pc and a limiting radius of 8.0±0.4 pc.[4]

Measuring the abundances of a set of F-type stars that are probable members demonstrates the cluster metallicity is very similar to the Sun.[5] It displays an extended main sequence turnoff on the Hertzsprung–Russell diagram, most likely due to differences in stellar rotation.[3] Two barium stars have been identified in NGC 5822, making it only the second cluster shown to host these objects as of 2013.[10]

Gallery

  • Map showing the location of NGC 5822

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics 633: 22. doi:10.1051/0004-6361/201936691. A99. Bibcode: 2020A&A...633A..99C. 
  2. ↑ 2.0 2.1 Seligman, Courtney. "NGC Objects: NGC 5800 - 5849". Celestial Atlas. https://cseligman.com/text/atlas/ngc58.htm#5822. 
  3. ↑ 3.0 3.1 3.2 3.3 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. doi:10.3847/1538-4357/ab16e4. 113. Bibcode: 2019ApJ...876..113S. 
  4. ↑ 4.0 4.1 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. doi:10.1051/0004-6361:20042516. Bibcode: 2005A&A...437..483B. 
  5. ↑ 5.0 5.1 5.2 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. doi:10.1088/0004-6256/142/4/127. 127. Bibcode: 2011AJ....142..127C. 
  6. ↑ "NASA/IPAC Extragalactic Database". Results for NGC 5749. http://nedwww.ipac.caltech.edu/. 
  7. ↑ "NGC 5822". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5822. 
  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. ↑ 9.0 9.1 Dawson, D. W. (November 1978). "DDO photometry of giants in four southern open clusters". Astronomical Journal 83: 1424–1429. doi:10.1086/112334. Bibcode: 1978AJ.....83.1424D. 
  10. ↑ Katime Santrich, O. J. et al. (August 2013). "Two Barium Stars in the Open Cluster NGC 5822". The Astronomical Journal 146 (2): 12. doi:10.1088/0004-6256/146/2/39. 39. Bibcode: 2013AJ....146...39K. 

External links

Coordinates: Sky map 15h 04m 21.2s, −54° 23′ 47″



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