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V533 Carinae
	Location of V533 Carinae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Carina
Right ascension	11h 12m 36.01358s
Declination	−60° 19′ 03.4516″
Apparent magnitude (V)	4.59
Characteristics
Evolutionary stage	Blue supergiant
Spectral type	A5Iae:
U−B color index	+0.08
B−V color index	+0.52
Variable type	α Cyg
Astrometry
Radial velocity (Rv)	−8.40 km/s
Proper motion (μ)	RA: −5.68 mas/yr ; Dec.: 2.15 mas/yr
Parallax (π)	1.18 ± 0.83 mas
Distance	12,700 ly ; (3,900 pc)
Absolute magnitude (MV)	−7.9
Details
Mass	17 M☉
Radius	141.5 R☉
Luminosity	96,000 L☉
Temperature	8,330 K
Rotational velocity (v sin i)	34 km/s
Other designations
	V533 Carinae, y Carinae, HR 4352, HD 97534, CD−59°3611, HIP 54751, SAO 251316, GC 15415, CCDM J11126-6019
Database references
SIMBAD	data

V533 Carinae (V533 Car, y Car, y Carinae) is a A-type supergiant and a Alpha Cygni variable star with a mean apparent magnitude of +4.59 in the constellation Carina. It is located at a distance of about 13,000 light years.^[8]

Location

V533 Carinae is found near the Carina Nebula on the edge of the constellation Carina towards Crux. It is a member of Collinder 240,^[9] a sparse open cluster sometimes considered to be a portion of the richer nearby cluster NGC 3572. Together with the small clusters Hogg 10 and 11, they are all part of the Carina OB2 stellar association.^[11]

V533 Carinae is the brightest star in the region. The other bright stars in NGC 3572 are hot young stars such as HD 97166 and all the clusters in the region are only a few million years old.^[12]

V533 Carinae is classified as a double star with the companion being a magnitude 11.5 star 21.7 arc-seconds away.^[13]

Variability

A light curve for V533 Carinae, plotted from *Hipparcos* data^[14]

V533 Carinae was one of many small amplitude variable stars detected from an analysis of Hipparcos photometry. It was granted its variable star designation in 1999 as a batch of 2,675 new variables.^[15] It is classified as an Alpha Cygni type variable and its brightness varies from magnitude +4.69 to +4.75 as measured on the Hipparcos photometric scale.^[5] A period of 1.58499 days and an average visual amplitude of 0.0146 magnitudes are quoted although the variations are not strictly regular.^[2]

Properties

V533 Carinae is a bright supergiant with a luminosity around 100,000 times that of the sun. The temperature is over 8,000 K and the radius around 140 R_☉. Its equatorial rotation is more than 15 times faster than the sun's.

Prior to 1971, it was always classified with an early or mid F-type spectral type, but since then has always been given a mid or late A class.^[4]^[16]

References

^ ^a ^b ^c ^d 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 Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. S2CID 10505995.
^ Gray, R. O.; Garrison, R. F. (1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
^ ^a ^b ^c Malaroda, Stella (1973). "Classification of Some Bright F-Type Stars with Unusual Spectra". Publications of the Astronomical Society of the Pacific. 85 (505): 328. Bibcode:1973PASP...85..328M. doi:10.1086/129463.
^ ^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. Bibcode:2009yCat....102025S.
^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ Gaia Collaboration (2016). "VizieR Online Data Catalog: Gaia DR1 (Gaia Collaboration, 2016)". VizieR On-line Data Catalog: I/337. Originally Published in: Astron. Astrophys. 1337. Bibcode:2016yCat.1337....0G. doi:10.26093/cds/vizier.1337.
^ ^a ^b Lorenzo, J.; Negueruela, I.; Castro, N.; Norton, A. J.; Vilardell, F.; Herrero, A. (2014). "Astrophysical parameters of the peculiar X-ray transient IGR J11215−5952". Astronomy & Astrophysics. 562: A18. arXiv:1312.5597. Bibcode:2014A&A...562A..18L. doi:10.1051/0004-6361/201321913. S2CID 119232680.
^ ^a ^b Arellano Ferro, A.; Parrao, L. (1990). "Colour excesses and absolute magnitudes for non-Cepheid F-G supergiants from uvbybeta photometry". Astronomy and Astrophysics. 239: 205. Bibcode:1990A&A...239..205A.
^ ^a ^b ^c ^d ^e Snow, Theodore P.; Lamers, Henny J. G. L. M.; Lindholm, Douglas M.; Odell, Andrew P. (1994). "An atlas of ultraviolet P Cygni profiles". The Astrophysical Journal Supplement Series. 95: 163. Bibcode:1994ApJS...95..163S. doi:10.1086/192099.
^ Clariá, J. J. (1976). "Relation of NGC 3590, Hogg 10, and Collinder 240 to the structure of the Carina spiral feature". Astronomical Journal. 81: 155. Bibcode:1976AJ.....81..155C. doi:10.1086/111870.
^ Messina, S. (2007). "The RACE-OC project: Rotation and ACtivity Evolution in Open Clusters". Memorie della Società Astronomica Italiana. 78: 628. Bibcode:2007MmSAI..78..628M.
^ Dommanget, J.; Nys, O. (1994). "Catalogue of the Components of Double and Multiple stars (CCDM). First edition". Obs. R. Belg. 115. Bibcode:1994CoORB.115.....D.
^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659: 1. Bibcode:1999IBVS.4659....1K.
^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.