Collinder 228

Collinder 228
Observation data (J2000 epoch)
Right ascension	10^h 44^m 00.0^s[1]
Declination	−60° 05′ 12″[1]
Distance	10,000 ly
Apparent magnitude (V)	4.4[1]
Apparent dimensions (V)	14
Physical characteristics
Other designations	OCl 828.0, MWSC 1845, C 1041-597, KPR2004b 262[1]
Associations
Constellation	Carina

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 6.16–6.49 .[3]

Prominent stars in Collinder 228

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)	[7]
V661 Car (HD 93130)	1	39900	−6.3	−10.1	68	O7II(f)	[7]
HD 305525	98	43600	−5.7	−9.8	58	O6V	[7]
	97	46100	−4.8	−9	47	O5V	[7]
HD 93146		42400	−5.1	−9.1	44	O6.5V((f))	[7]
HD 305524	7	41000	−5.2	−9.1	42	O7V((f))	[7]
HD 93222	6	37200	−5.7	−9.3	42	O8III((f))	[7]
HD 305523	32	35700	−5.6	−9.1	38	O8.5III	[7]
HD 305532	38	43600	−4.4	−8.5	38	O6V((f))	[7]
HD 305438	24	38500	−4.6	−8.4	32	O8V	[7]
HD 93028	27	35700	−4.9	−8.4	30	O8.5III	[7]
HD 305518	22	34700	−5	−8.3	29	O9.5V	[7]
HD 93027	14	36000	−4.8	−8.3	29	O9V	[7]
	39	37200	−4.6	−8.2	29	O8.5V((f))	[7]
HD 305539	94	37200	−4.4	−8.1	28	O8.5V	[7]
	67	36000	−4.7	−8.2	28	O9V	[7]
HD 93576	93	36000	−4.7	−8.2	28	O9V	[7]
	21	37200	−4.2	−7.8	27	O8.5V	[7]
HD 305536	5	34700	−4.7	−8.1	26	O9.5V	[7]
	66	34700	−3.9	−7.3	22	O9.5V	[7]
	12	20900	−6.1	−8	20	B2.5Ia:	[7]

See also

• List of most massive stars

References

1. "Collinder 228". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 December 2020.
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). General Catalogue of Variable Stars (Samus+ 2007–2013) (Report). VizieR On-line Data Catalog. Vol. 1. p. 02025. Bibcode:2009yCat....102025S. doi:10.1134/S1063772917010085. B/GCVS. Originally published in Astronomy Reports (January 2017) DOI 10.1134/S1063772917010085
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. Bibcode:2019A&A...625A..57H. doi:10.1051/0004-6361/201834850. S2CID 104292503.
5. Rainot, A.; Reggiani, M.; Sana, H.; Bodensteiner, J.; Gomez-Gonzalez, C.A.; Absil, O.; et al. (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. Parkin, E.R.; Broos, P.S.; Townsley, L.K.; Pittard, J.M.; Moffat, A.F.J.; Nazé, Y.; et al. (2011). "X-ray emission from the double-binary OB-star system QZ Car (HD 93206)". The Astrophysical Journal Supplement. 194 (1). article 8. arXiv:1103.0794. Bibcode:2011ApJS..194....8P. doi:10.1088/0067-0049/194/1/8. S2CID 119292907.
7. Massey, P.; de Gioia-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. S2CID 53345173.