HD 87643

HD 87643
	; HD 87643 is embedded in the faint nebulosity at the centre of this image. The red arc is NGC 3199, aWolf–Rayet nebulaaround WR 18.
Observation data; EpochJ2000EquinoxJ2000
Constellation	Carina
Right ascension	10h04m30.2840s
Declination	−58° 39′ 52.091″
Apparent magnitude(V)	8.87(7.4 - 9.8)
Characteristics
Spectral type	B3 I[e]
U−Bcolor index	−0.54
B−Vcolor index	+0.69
Variable type	INA
Astrometry
Proper motion(μ)	RA:−7.557mas/yr; Dec.:+5.438mas/yr
Parallax(π)	0.6293 ± 0.1227mas
Distance	approx. 5,000ly; (approx. 1,600pc)
Absolute magnitude(MV)	−4.1
Details
Mass	25M☉
Luminosity	41,000L☉
Temperature	17,000K
Other designations
	V640Carinae,CD−58°3005,HD87643,SAO237672,RAFGL4767,2MASSJ10043028-5839521,AAVSO1001-58
Database references
SIMBAD	data

HD 87643is aB[e]classbinary starembedded in areflection nebula.

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^[6]and an extended reflection nebula. and is important forastronomersin their study ofstellar formation.^[8]

Avisual band light curvefor V640 Carinae, plotted from AAVSO data

All the properties of HD 87643 are highly uncertain. Its distance has been estimated anywhere from one to six kpc. TheGeneral Catalogue of Variable Starsclassifies 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 starsystem with the two stars separated by about 52 AU, but the nature of the companion is unknown.^[8]

References

^^a ^b ^c ^d ^eVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData Release 3. Summary of the content and survey properties ".Astronomy and Astrophysics.674:A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this sourceatVizieR.
^^a ^b ^cMcGregor, P. J.; Hyland, A. R.; Hillier, D. J. (1988)."Atomic and molecular line emission from early-type high-luminosity stars".Astrophysical Journal.324:1071.Bibcode:1988ApJ...324.1071M.doi:10.1086/165964.
^^a ^bSamus, 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.
^^a ^bAltvater, Michael A.; Wu, Shuang; Zhang, Zhenyuan; Zhu, Tianhui; Li, Guohong; Watanabe, Kenji; Taniguchi, Takashi; Andrei, Eva Y. (2019). "Electrostatic imaging of encapsulated graphene".2D Materials.6(4): 045034.arXiv:1911.04114.Bibcode:2019TDM.....6d5034A.doi:10.1088/2053-1583/ab254e.S2CID 189991060.
^^a ^bMenu, 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.S2CID 55383954.
^^a ^bMillour, 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.S2CID 16463437.

External links

The field around HD 87643

[dr3-1] Vallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData Release 3. Summary of the content and survey properties ".Astronomy and Astrophysics.674:A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this sourceatVizieR.

[mcgregor-2] McGregor, P. J.; Hyland, A. R.; Hillier, D. J. (1988)."Atomic and molecular line emission from early-type high-luminosity stars".Astrophysical Journal.324:1071.Bibcode:1988ApJ...324.1071M.doi:10.1086/165964.

[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.Bibcode:2009yCat....102025S.

[4] 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-5] 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.

[Laws2019-6] Altvater, Michael A.; Wu, Shuang; Zhang, Zhenyuan; Zhu, Tianhui; Li, Guohong; Watanabe, Kenji; Taniguchi, Takashi; Andrei, Eva Y. (2019). "Electrostatic imaging of encapsulated graphene".2D Materials.6(4): 045034.arXiv:1911.04114.Bibcode:2019TDM.....6d5034A.doi:10.1088/2053-1583/ab254e.S2CID 189991060.

[menu-7] Menu, 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.S2CID 55383954.

[millour-8] Millour, 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.S2CID 16463437.

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Observation data EpochJ2000EquinoxJ2000
HD 87643 is embedded in the faint nebulosity at the centre of this image. The red arc is NGC 3199, aWolf–Rayet nebulaaround WR 18.
Constellation	Carina
Right ascension	10^h04^m30.2840^s^[1]
Declination	−58° 39′ 52.091″^[1]
Apparent magnitude(V)	8.87^[2](7.4 - 9.8^[3])
Characteristics
Spectral type	B3 I[e]^[4]
U−Bcolor index	−0.54^[2]
B−Vcolor index	+0.69^[2]
Variable type	INA^[3]
Astrometry

Proper motion(μ)	RA:−7.557^[1]mas/yr Dec.:+5.438^[1]mas/yr
Parallax(π)	0.6293 ± 0.1227mas^[1]
Distance	approx. 5,000ly (approx. 1,600pc)
Absolute magnitude(M_V)	−4.1^[5]

Details

Mass	25^[6]`M`_☉
Luminosity	41,000^[7]`L`_☉
Temperature	17,000^[7]K

Other designations
V640Carinae,CD−58°3005,HD87643,SAO237672,RAFGL4767,2MASSJ10043028-5839521,AAVSO1001-58
Database references
SIMBAD	data