Astronomy:NGC 2232

From HandWiki
NGC 2232
NGC 2232.png
NGC 2232 (taken from Stellarium)
Observation data (J2000 epoch)
ConstellationMonoceros
Right ascension 06h 27m 15s[1]
Declination–04° 45′ 30″[1]
Distance1,060 ly (325 pc)[2]
Apparent magnitude (V)3.9[3]
Apparent dimensions (V)30′ [3]
Physical characteristics
Mass< 100[4] M
Radius~15 ly[4]
Estimated age30.9 Myr[2]
Other designationsCr 93, C 0624-047[5]
See also: Open cluster, List of open clusters
Map showing the location of NGC 2232

NGC 2232 is a bright open star cluster in the equatorial constellation of Monoceros, centered on the star 10 Monocerotis.[3] It is located in the Gould Belt close to the Orion Nebula cluster,[6] at a mean distance of 1,060 ly from the Sun.[2] The average radial velocity of the cluster members is 26.6±0.77 km/s.[7] This is one of the nearest open clusters to the Sun, which makes it a potentially useful target for studying young stars and their transition to the main sequence.[8]

The cluster has an angular radius of 36 and a core angular radius of 7.2′. It is a sparse cluster with twenty high–probability members.[2] This is considered a super-solar cluster, with the components generally having a higher abundance of iron compared to the Sun. The mean metallicity is 0.22±0.09 or 0.32±0.08, depending on what assumptions are made.[7] At least four cluster members display an infrared excess at a wavelength of 8μm that is suggestive of warm dust, while the A-type star HD 45435 displays a strong excess at 24μm. The latter may indicate the star is in an early evolutionary state.[6] Only one member of the cluster appears to be chemically peculiar.[9]

References

  1. 1.0 1.1 Wu, Zhen-Yu et al. (November 2009), "The orbits of open clusters in the Galaxy", Monthly Notices of the Royal Astronomical Society 399 (4): 2146–2164, doi:10.1111/j.1365-2966.2009.15416.x, Bibcode2009MNRAS.399.2146W. 
  2. 2.0 2.1 2.2 2.3 Kharchenko, N. V. et al. (2005), "Astrophysical parameters of Galactic open clusters", Astronomy and Astrophysics 438 (3): 1163, doi:10.1051/0004-6361:20042523, Bibcode2005A&A...438.1163K. 
  3. 3.0 3.1 3.2 Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8. https://archive.org/details/collinsatlasofni0000dunl. 
  4. 4.0 4.1 Finlay, Warren H. (2014), Concise Catalog of Deep-sky Objects, The Patrick Moore Practical Astronomy Series (2nd ed.), Springer Science & Business Media, p. 188, ISBN 978-3-319-03169-9. 
  5. "NGC 2232". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2232. 
  6. 6.0 6.1 Currie, Thayne et al. (November 2008), "A Spitzer Study of Debris Disks in the Young Nearby Cluster NGC 2232: Icy Planets Are Common around ~1.5-3 M☉ Stars", The Astrophysical Journal 688 (1): 597–615, doi:10.1086/591842, Bibcode2008ApJ...688..597C. 
  7. 7.0 7.1 Monroe, TalaWanda R.; Pilachowski, Catherine A. (December 2010), "Metallicities of Young Open Clusters. I. NGC 7160 and NGC 2232", The Astronomical Journal 140 (6): 2109–2123, doi:10.1088/0004-6256/140/6/2109, Bibcode2010AJ....140.2109M. 
  8. Orban, Chris; Patten, Brian (January 1, 2004), Late-Type Membership of the Open Cluster NGC 2232, Greenbelt, MD, United States: NASA Goddard Space Flight Center, https://ntrs.nasa.gov/search.jsp?R=20040082212, retrieved 2020-04-13. 
  9. Jenkner, H.; Maitzen, H. M. (November 1987), "Photoelectric search for CP2-stars in open clusters. X. NGC 2232, NGC2343, CR 140, and TR 10.", Astronomy and Astrophysics, Supplemental Series 71: 255–261, Bibcode1987A&AS...71..255J. 

External links