The system is described as having "one of the most extreme infrared excesses for this object class". It harbours a large amount of both hot and cold dust, and is surrounded by a debris disk with radius 2.5-3AU[7] and an extended reflection nebula. and is important forastronomers in their study ofstellar formation.[9]
All the properties of HD 87643 are highly uncertain. Its distance has been estimated anywhere from one to six kpc. In 1996, Carol Anne Gradyet al. announced that the star is avariable star.[10] It was given itsvariable star designation, V640 Carinae, in 2008.[11] TheGeneral Catalogue of Variable Stars classifies it as anOrion variable, a pre-main sequence star, but other authors consider it to be a supergiant B[e] star. It has been confirmed to be abinary star system with the two stars separated by about 52 AU, but the nature of the companion is unknown.[9]
^abSamus, 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.
^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.
^Surdej, A.; Surdej, J.; Swings, J. P.; Wamsteker, W. (1981). "The Reflection Nebula Surrounding HD87643".Astronomy and Astrophysics.93: 285.Bibcode:1981A&A....93..285S.
^abMenu, J.; Van Boekel, R.; Henning, Th.; Leinert, Ch.; Waelkens, C.; Waters, L. B. F. M. (2015). "The structure of disks around intermediate-mass young stars from mid-infrared interferometry. Evidence for a population of group II disks with gaps".Astronomy & Astrophysics.581: A107.arXiv:1506.03274.Bibcode:2015A&A...581A.107M.doi:10.1051/0004-6361/201525654.S2CID55383954.
^abMillour, F.; Chesneau, O.; Borges Fernandes, M.; Meilland, A.; Mars, G.; Benoist, C.; Thiébaut, E.; Stee, P.; Hofmann, K.-H.; Baron, F.; Young, J.; Bendjoya, P.; Carciofi, A.; Domiciano De Souza, A.; Driebe, T.; Jankov, S.; Kervella, P.; Petrov, R. G.; Robbe-Dubois, S.; Vakili, F.; Waters, L. B. F. M.; Weigelt, G. (2009). "A binary engine fuelling HD 87643's complex circumstellar environment. Determined using AMBER/VLTI imaging".Astronomy and Astrophysics.507 (1):317–326.arXiv:0908.0227.Bibcode:2009A&A...507..317M.doi:10.1051/0004-6361/200811592.S2CID16463437.
^Grady, C. A.; Perez, M. R.; Talavera, A.; Bjorkman, K. S.; de Winter, D.; Thé, P. S.; Molster, F. J.; van den Ancker, M. E.; Sitko, M. L.; Morrison, N. D.; Beaver, M. L.; McCollum, B.; Castelaz, M. W. (November 1996). "The β Pictoris phenomenon among Herbig Ae/Be stars. UV and optical high dispersion spectra".Astronomy and Astrophysics Supplement.120:57–177.Bibcode:1996A&AS..120..157G.doi:10.1051/aas:1996282.
