QZ Carinae

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[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 (Rv)−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]
Distance2,300[4] pc
Orbit[4]
PrimaryA
CompanionB
Period (P)~25.4 yr
Semi-major axis (a)~35 AU
Eccentricity (e)0.0
Inclination (i)60°
Orbit[4]
PrimaryA1
CompanionA2
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]
PrimaryB1
CompanionB2
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
Mass69.8[6] M☉
Radius22.1[7] R☉
Luminosity400,000[7] L☉
Surface gravity (log g)3.2[7] cgs
Temperature29,564[6] K
A2
Mass8.85[6] M☉
Radius3.0[7] R☉
Luminosity1,260[7] L☉
Surface gravity (log g)4.3[7] cgs
Temperature23,446[6] K
B1
Mass25.5[6] M☉
Radius13.7[7] R☉
Luminosity200,000[7][4] L☉
Surface gravity (log g)3.6[7] cgs
Temperature29,687[6] K
B2
Mass33.2[6] M☉
Radius7.53[7] R☉
Luminosity50,100[7] L☉
Surface gravity (log g)3.92[7] cgs
Temperature32,979[6] K
Other designations
QZ Car, HD 93206, HIP 52526, CD−59 3287, GC 14784, SAO 238414, GSC 08626-02523
Database references
SIMBADdata

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.

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  2. ^ 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.
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  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.
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  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.