Collinder 228

Collinder 228 is an open cluster within the southern part of the Carina Nebula NGC 3372, about 25' south of η Carinae.[2] It is probably composed of stars which recently formed from the material in the nebula. QZ Carinae is the brightest member of Collinder 228 with an apparent magnitude between 6.16 and 6.49.[3]

Prominent stars
Star name FMF number Effective temperature Absolute magnitude Bolometric magnitude Mass (M☉) Spectral type Ref.
WR 24 (HD 93131) 3 50100 -7.34 -11.4 114 WN6ha-w [4]
QZ Car (HD 93206) 33 30400+20000+34000+32900 -9.2 + 3 + 8.5 + 7 -10.6 27.1+6.5+25.4+17.1 O9.7I+B2V+O8III+O9V [5][6][7]
HD 93632 92 45400 -6.1 -10.2 76 O5III(f) [6]
V661 Car (HD 93130) 1 39900 -6.3 -10.1 68 O7II(f) [6]
HD 305525 98 43600 -5.7 -9.8 58 O6V [6]
97 46100 -4.8 -9 47 O5V [6]
HD 93146 42400 -5.1 -9.1 44 O6.5V((f)) [6]
HD 305524 7 41000 -5.2 -9.1 42 O7V((f)) [6]
HD 93222 6 37200 -5.7 -9.3 42 O8III((f)) [6]
HD 305523 32 35700 -5.6 -9.1 38 O8.5III [6]
HD 305532 38 43600 -4.4 -8.5 38 O6V((f)) [6]
HD 305438 24 38500 -4.6 -8.4 32 O8V [6]
HD 93028 27 35700 -4.9 -8.4 30 O8.5III [6]
HD 305518 22 34700 -5 -8.3 29 O9.5V [6]
HD 93027 14 36000 -4.8 -8.3 29 O9V [6]
39 37200 -4.6 -8.2 29 O8.5V((f)) [6]
HD 305539 94 37200 -4.4 -8.1 28 O8.5V [6]
67 36000 -4.7 -8.2 28 O9V [6]
HD 93576 93 36000 -4.7 -8.2 28 O9V [6]
21 37200 -4.2 -7.8 27 O8.5V [6]
HD 305536 5 34700 -4.7 -8.1 26 O9.5V [6]
66 34700 -3.9 -7.3 22 O9.5V [6]
12 20900 -6.1 -8 20 B2.5Ia: [6]
Collinder 228
Observation data (J2000 epoch)
ConstellationCarina
Right ascension10h 44m 00.0s[1]
Declination−60° 05′ 12″[1]
Distance10,000 ly
Apparent magnitude (V)4.4[1]
Apparent dimensions (V)14
Physical characteristics
Other designationsOCl 828.0, MWSC 1845, C 1041-597, KPR2004b 262[1]

References
  1. "Collinder 228". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-29.
  2. Feinstein, A. (1995). "Open Clusters in the Carina Nebula". Revista Mexicana de Astronomía y Astrofísica, Serie de Conferencias. 2: 57. Bibcode:1995RMxAC...2...57F.
  3. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: 02025. Bibcode:2009yCat....102025S.
  4. Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J.; Oskinova, L. M. (2019). "The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters". Astronomy & Astrophysics. A57: 625. arXiv:1904.04687. doi:10.1051/0004-6361/201834850. S2CID 104292503.
  5. Rainot, A.; Reggiani, M.; Sana, H.; Bodensteiner, J.; Gomez-Gonzalez, C. A.; Absil, O.; Christiaens, V.; Delorme, P.; Almeida, L. A.; Caballero-Nieves, S.; De Ridder, J.; Kratter, K.; Lacour, S.; Le Bouquin, J. -B.; Pueyo, L.; Zinnecker, H. (2020). "Carina High-contrast Imaging Project for massive Stars (CHIPS). I. Methodology and proof of concept on QZ Car (≡ HD 93206)". Astronomy and Astrophysics. 640: A15. arXiv:2006.01914. Bibcode:2020A&A...640A..15R. doi:10.1051/0004-6361/201936448. S2CID 219260368.
  6. Massey, P.; Degioia-Eastwood, K.; Waterhouse, E. (2001). "The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turnoffs. II. Results from 12 Galactic Clusters and OB Associations". The Astronomical Journal. 121 (2): 1050–1070. arXiv:astro-ph/0010654. Bibcode:2001AJ....121.1050M. doi:10.1086/318769.
  7. Parkin, E. R.; Broos, P. S.; Townsley, L. K.; Pittard, J. M.; et al. (2011). "X-ray emission from the double-binary OB-star system QZ Car (HD 93206)". The Astrophysical Journal Supplement. 194 (1): article id. 8, 11 pp. arXiv:1103.0794. Bibcode:2011ApJS..194....8P. doi:10.1088/0067-0049/194/1/8. S2CID 119292907.

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