QZ Carinae

QZ Carinae
	QZ Carinae QZ Carinae (circled) in the Carina Nebula; Credit: ESO
Observation data; Epoch J2000 Equinox J2000
Constellation	Carina
Right ascension	10h 44m 22.91114s
Declination	−59° 59′ 35.9550″
Apparent magnitude (V)	6.24 (6.16 - 6.49)
Characteristics
Evolutionary stage	Blue supergiant (A1); Main sequence (A2 and B2); Blue giant (B1)
Spectral type	A1: O9.7I; A2: B2V; B1: O8III; B2: O9V
U−B color index	−0.84
B−V color index	+0.13
Variable type	β Lyr
Astrometry
Radial velocity (Rv)	−2.80 km/s
Proper motion (μ)	RA: −6.63 mas/yr ; Dec.: 2.48 mas/yr
Parallax (π)	1.67 ± 0.40 mas
Distance	2,300 pc
Orbit
Primary	A
Companion	B
Period (P)	~25.4 yr
Semi-major axis (a)	~35 AU
Eccentricity (e)	0.0
Inclination (i)	60°
Orbit
Primary	A1
Companion	A2
Period (P)	20.72 days
Semi-major axis (a)	116 R☉
Eccentricity (e)	0.34
Inclination (i)	60°
Argument of periastron (ω); (secondary)	141°
Orbit
Primary	B1
Companion	B2
Period (P)	5.999 days
Semi-major axis (a)	49 R☉
Eccentricity (e)	0.1
Inclination (i)	86°
Argument of periastron (ω); (secondary)	~20°
Details
A1
Mass	69.8 M☉
Radius	22.1 R☉
Luminosity	400,000 L☉
Surface gravity (log g)	3.2 cgs
Temperature	29,564 K
A2
Mass	8.85 M☉
Radius	3.0 R☉
Luminosity	1,260 L☉
Surface gravity (log g)	4.3 cgs
Temperature	23,446 K
B1
Mass	25.5 M☉
Radius	13.7 R☉
Luminosity	200,000 L☉
Surface gravity (log g)	3.6 cgs
Temperature	29,687 K
B2
Mass	33.2 M☉
Radius	7.53 R☉
Luminosity	50,100 L☉
Surface gravity (log g)	3.92 cgs
Temperature	32,979 K
Other designations
	QZ Car, HD 93206, HIP 52526, CD−59 3287, GC 14784, SAO 238414, GSC 08626-02523
Database references
SIMBAD	data

QZ Carinae (HD 93206) is a multiple star system in the constellation Carina. It is the brightest member of the loose open cluster Collinder 228 and one of the brightest stars in the Carina Nebula. The apparent magnitude is variable from +6.16 to +6.49 with a period of 6 days.

^ ^a ^b ^c ^d ^e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
^ ^a ^b ^c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
^ ^a ^b 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.
^ ^a ^b ^c ^d ^e ^f 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.
^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. ISSN 0004-6361. S2CID 119387088.
^ ^a ^b ^c ^d ^e ^f ^g ^h Brož, M.; Harmanec, P.; Zasche, P.; Catalan-Hurtado, R.; Barlow, B. N.; Frondorf, W.; Wolf, M.; Drechsel, H.; Chini, R.; Nasseri, A.; Labadie-Bartz, J.; Christie, G. W.; Walker, W. S. G.; Blackford, M.; Blane, D.; Henden, A. A.; Bohlsen, T.; Božić, H.; Jonák, J. (2022). "Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinæ. II. N-body model". Astronomy & Astrophysics. 666: A24. arXiv:2206.12160. Bibcode:2022A&A...666A..24B. doi:10.1051/0004-6361/202243596. S2CID 250048618.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l 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.

[hipparcos-1] Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.

[ducati-2] Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.

[gcvs-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.

[parkin-4] ^ ^a ^b ^c ^d ^e ^f 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.

[PourbaixTokovinin2004-5] Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. ISSN 0004-6361. S2CID 119387088.

[Broz-6] ^ ^a ^b ^c ^d ^e ^f ^g ^h Brož, M.; Harmanec, P.; Zasche, P.; Catalan-Hurtado, R.; Barlow, B. N.; Frondorf, W.; Wolf, M.; Drechsel, H.; Chini, R.; Nasseri, A.; Labadie-Bartz, J.; Christie, G. W.; Walker, W. S. G.; Blackford, M.; Blane, D.; Henden, A. A.; Bohlsen, T.; Božić, H.; Jonák, J. (2022). "Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinæ. II. N-body model". Astronomy & Astrophysics. 666: A24. arXiv:2206.12160. Bibcode:2022A&A...666A..24B. doi:10.1051/0004-6361/202243596. S2CID 250048618.

[rainot-7] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l 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.

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Observation data Epoch J2000 Equinox J2000
QZ Carinae QZ Carinae (circled) in the Carina Nebula Credit: ESO
Constellation	Carina
Right ascension	10^h 44^m 22.91114^s^[1]
Declination	−59° 59′ 35.9550″^[1]
Apparent magnitude (V)	6.24^[2] (6.16 - 6.49^[3])
Characteristics
Evolutionary stage	Blue supergiant (A1) Main sequence (A2 and B2) Blue giant (B1)
Spectral type	A1: O9.7I A2: B2V B1: O8III B2: O9V^[4]
U−B color index	−0.84^[2]
B−V color index	+0.13^[2]
Variable type	β Lyr^[3]
Astrometry

Radial velocity (R_v)	−2.80^[5] km/s
Proper motion (μ)	RA: −6.63^[1] mas/yr Dec.: 2.48^[1] mas/yr
Parallax (π)	1.67 ± 0.40 mas^[1]
Distance	2,300^[4] pc

Orbit^[4]
Primary	A
Companion	B
Period (P)	~25.4 yr
Semi-major axis (a)	~35 AU
Eccentricity (e)	0.0
Inclination (i)	60°
Orbit^[4]
Primary	A1
Companion	A2
Period (P)	20.72 days
Semi-major axis (a)	116 `R`_☉
Eccentricity (e)	0.34
Inclination (i)	60°
Argument of periastron (ω) (secondary)	141°
Orbit^[4]
Primary	B1
Companion	B2
Period (P)	5.999 days
Semi-major axis (a)	49 `R`_☉
Eccentricity (e)	0.1
Inclination (i)	86°
Argument of periastron (ω) (secondary)	~20°
Details
A1
Mass	69.8^[6] `M`_☉
Radius	22.1^[7] `R`_☉
Luminosity	400,000^[7] `L`_☉
Surface gravity (log g)	3.2^[7] cgs
Temperature	29,564^[6] K
A2
Mass	8.85^[6] `M`_☉
Radius	3.0^[7] `R`_☉
Luminosity	1,260^[7] `L`_☉
Surface gravity (log g)	4.3^[7] cgs
Temperature	23,446^[6] K

B1
Mass	25.5^[6] `M`_☉
Radius	13.7^[7] `R`_☉
Luminosity	200,000^[7]^[4] `L`_☉
Surface gravity (log g)	3.6^[7] cgs
Temperature	29,687^[6] K
B2
Mass	33.2^[6] `M`_☉
Radius	7.53^[7] `R`_☉
Luminosity	50,100^[7] `L`_☉
Surface gravity (log g)	3.92^[7] cgs
Temperature	32,979^[6] K
Other designations
QZ Car, HD 93206, HIP 52526, CD−59 3287, GC 14784, SAO 238414, GSC 08626-02523
Database references
SIMBAD	data

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QZ Carinae

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