HD 87643

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HD 87643
Digitized Sky Survey Image of the double star HD 87643.jpg
HD 87643 is embedded in the faint nebulosity at the centre of this image. The red arc is NGC 3199, a Wolf–Rayet nebula around WR 18.
Observation data
Epoch J2000       Equinox J2000
Constellation Carina
Right ascension 10h 04m 30.2840s [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−B color index −0.54 [2]
B−V color 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 ± 0.1227  mas [1]
Distance approx. 5,000  ly
(approx. 1,600  pc)
Absolute magnitude  (MV)−4.1 [5]
Details
Mass 25 [6]   M☉
Luminosity 41,000 [7]   L☉
Temperature 17,000 [7]   K
Other designations
V640 Carinae, CD −58°3005, HD 87643, SAO 237672, RAFGL 4767, 2MASS J10043028-5839521, AAVSO 1001-58
Database references
SIMBAD data
Reflection nebula around HD 87643 ESO- Reflection Nebula around HD 87643-phot-28a-09-fullres.jpg
Reflection nebula around HD 87643

HD 87643 is a B[e] class binary star embedded in a reflection 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 2.5-3 AU [6] and an extended reflection nebula. and is important for astronomers in their study of stellar formation. [8]

A visual band light curve for V640 Carinae, plotted from AAVSO data V640CarLightCurve.png
A visual band light curve for 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. In 1996, Carol Anne Grady et al. announced that the star is a variable star. [9] It was given its variable star designation, V640 Carinae, in 2008. [10] The General Catalogue of Variable Stars classifies it as an Orion variable, a pre-main sequence star, but other authors consider it to be a supergiant B[e] star. It has been confirmed to be a binary star system with the two stars separated by about 52 AU, but the nature of the companion is unknown. [8]

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References

  1. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data 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 source at VizieR.
  2. 1 2 3 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 .
  3. 1 2 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.
  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.
  6. 1 2 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.
  7. 1 2 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.
  8. 1 2 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.
  9. ↑ 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 . Retrieved 12 January 2025.
  10. ↑ Kazarovets, E. V.; Samus, N. N; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (November 2008). "The 79th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 5863: 1–16. Bibcode:2008IBVS.5863....1K . Retrieved 12 January 2025.
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