NGC 330

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NGC 330
NGC330 - HST - Potw2126a.jpg
The star cluster NGC 330
Credit: Hubble Space Telescope
Observation data (J2000 epoch)
Right ascension 00h 56m 17.6s [1]
Declination −72° 27′ 47″ [1]
Distance 182000 [1]
Apparent magnitude  (V)9.60 [2]
Apparent dimensions (V)2.8′ × 2.5′ [3]
Physical characteristics
Mass5.4×104 [2]   M☉
Estimated age0.09±0.05 Gyr [2]
Other designations ESO 029-SC 024. [1]
Associations
Constellation Tucana
See also: Open cluster, List of open clusters

NGC 330 is an open cluster in the Small Magellanic Cloud. It is located in the constellation Tucana. It was discovered on 1 August 1826 by James Dunlop. It was described by Dreyer as "a globular cluster, very bright, small, a little extended, stars from 13th to 15th magnitude." [4] At an aperture of 31.0 arcseconds, the apparent V-band magnitude is 9.60, but at this wavelength, it also has 0.36 magnitudes of interstellar extinction. [2]

NGC 330 is quite young, at about 40 million years old, and has a large proportion of Be stars. [5] Its estimated mass is 5.4×104  M☉, and its total luminosity is 8.93×105  L☉, leading to a mass-to-luminosity ratio of 0.06 M☉/L☉. [2] All else equal, older star clusters have higher mass-to-luminosity ratios; that is, they have lower luminosities for the same mass. [2] About 34% of the massive star population in NGC 330 is estimated to be in a close binary star system; this is lower than clusters in the Large Magellanic Cloud and the Milky Way, but it is unknown if this is because NGC 330 is metal-poor or is older than the compared clusters. [5]

References

  1. 1 2 3 4 "NASA/IPAC Extragalactic Database". Results for NGC 0330. Retrieved September 2, 2016.
  2. 1 2 3 4 5 6 Song, Ying-Yi; Mateo, Mario; Bailey, John I.; Walker, Matthew G.; Roederer, Ian U.; Olszewski, Edward W.; Reiter, Megan; Kremin, Anthony (2021). "Dynamical masses and mass-to-light ratios of resolved massive star clusters – II. Results for 26 star clusters in the Magellanic Clouds". Monthly Notices of the Royal Astronomical Society. 504 (3): 4160–4191. arXiv: 2104.06882 . doi: 10.1093/mnras/stab1065 .
  3. ↑ "NGC 330". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved January 1, 2016.
  4. ↑ "New General Catalog Objects: NGC 300 - 349". Cseligman. Retrieved October 30, 2016.
  5. 1 2 Bodensteiner, J.; Sana, H.; Wang, C.; Langer, N.; Mahy, L.; Banyard, G.; de Koter, A.; de Mink, S. E.; Evans, C. J.; Götberg, Y.; Patrick, L. R.; Schneider, F. R. N.; Tramper, F. (2021). "The young massive SMC cluster NGC 330 seen by MUSE. II. Multiplicity properties of the massive-star population". Astronomy & Astrophysics. 652: 18. arXiv: 2104.13409 . Bibcode:2021A&A...652A..70B. doi:10.1051/0004-6361/202140507. S2CID   207852580. A70.


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