NGC 5316

NGC 5316 is an open cluster in the constellation Centaurus. It was discovered by James Dunlop in 1826. Located approximately 4,000 light years away from Earth, it is located in the Carina-Sagittarius arm.[5]

NGC 5316
NGC 5316
Observation data (J2000 epoch)
ConstellationCentaurus
Right ascension 13h 53m 57s[1]
Declination−61° 52′ 06″[1]
Distance3,960 ly (1,215 pc[2])
Apparent magnitude (V)6.0 [1]
Apparent dimensions (V)15'[3]
Physical characteristics
Mass1,500[4] M☉
Estimated age100 million years[5]
Other designationsCollinder 279, Melotte 122

There are 570 probable member stars within the angular radius of the cluster and 262 within the central part of the cluster. The tidal radius of the cluster is 6.0 - 8.1 parsecs (19 - 26 light years) and represents the average outer limit of NGC 5316, beyond which a star is unlikely to remain gravitationally bound to the cluster core.[3] The brightest member of the cluster (lucida) is star No. 31 (mag. 9.40).[6] Star 31 has significantly more barium than the rest of the group and the Ba II line is visually stronger than the rest of the cluster. The turn-off mass of the cluster is estimated to be at 5.0 M☉.[7] The hottest stars of the cluster are of spectral type B5–B7.[5] NGC 5316 has metallicity nearly the same as the solar one ([Fe/H] = −0.02 ± 0.05).[7]

The age of the cluster has been estimated to be from as low as 51 myr (by the first photometric study of the cluster, in 1968, by Lindoff) to as high as 195 myr (by Battinelli & Capuzzo-Dolcetta, 1991).[7] Pedreros et al. estimated its age to be (1.24 ± 0.15) × 108 years from ZAMS fitting the cluster (Pedreros, 1987)[6] and the UBVI CCD photometric study of the cluster by Carraro et al. estimated its age to be 100 ± 10 million years.[5]

References
  1. "NGC 5316". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-19.
  2. WEBDA page for open cluster NGC 5316
  3. Kharchenko, N. V.; Piskunov, A. E.; Schilbach, E.; Röser, S.; Scholz, R.-D. (3 October 2013). "Global survey of star clusters in the Milky Way". Astronomy & Astrophysics. 558: A53. arXiv:1308.5822. Bibcode:2013A&A...558A..53K. doi:10.1051/0004-6361/201322302.
  4. Piskunov, A. E.; Schilbach, E.; Kharchenko, N. V.; Röser, S.; Scholz, R.-D. (6 November 2007). "Tidal radii and masses of open clusters". Astronomy & Astrophysics. 477 (1): 165–172. Bibcode:2008A&A...477..165P. doi:10.1051/0004-6361:20078525.
  5. Carraro, Giovanni; Seleznev, Anton F. (21 February 2012). "UBVI CCD photometry and star counts in nine inner disc Galactic star clusters". Monthly Notices of the Royal Astronomical Society. 419 (4): 3608–3623. arXiv:1110.3011. Bibcode:2012MNRAS.419.3608C. doi:10.1111/j.1365-2966.2011.20010.x.
  6. Pedreros, Mario (November 1987). "Photometric study of the Southern open clusters NGC 5316 and NGC 6214". The Astronomical Journal. 94: 1237. Bibcode:1987AJ.....94.1237P. doi:10.1086/114559.
  7. Drazdauskas, Arnas; Tautvaišienė, Gražina; Smiljanic, Rodolfo; Bagdonas, Vilius; Chorniy, Yuriy (11 October 2016). "Chemical composition of evolved stars in the young open clusters NGC 4609 and NGC 5316". Monthly Notices of the Royal Astronomical Society. 462 (1): 794–803. arXiv:1608.08375. Bibcode:2016MNRAS.462..794D. doi:10.1093/mnras/stw1701.
  • Media related to NGC 5316 at Wikimedia Commons


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