Astronomy:WR 86

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Short description: Visual binary star system
WR 86
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A light curve for V1035 Scorpii, plotted from TESS data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Scorpius[2]
Right ascension  17h 18m 23.06137s[3]
Declination −34° 24′ 30.6308″[3]
Apparent magnitude (V) 9.27[4]
Characteristics
Evolutionary stage Wolf-Rayet star[5]
Spectral type WC7 + B0III[5]
Apparent magnitude (J) 7.436[6]
Apparent magnitude (K) 6.666[7]
U−B color index −0.07[8]
B−V color index +0.63[8]
Variable type β Cep[4]
Astrometry
Proper motion (μ) RA: −0.92[3] mas/yr
Dec.: −4.80[3] mas/yr
Parallax (π)1.84 ± 1.62[3] mas
Distance2,100±800[5] pc
Absolute magnitude (MV)−4.3 + −4.3[5]
Details
WR
Radius10[9] R☉
Luminosity200,000[5][9] L☉
Temperature56,000[9] K
B
Mass19 M☉
Radius~8.5 (SBL) R☉
Luminosity63,000[5] L☉
Temperature31,405[5] K
Age4.0[5] Myr
Other designations
V1035 Scorpii, CD−34°11622, HD 156327, HIP 84655, 2MASS J17182306-3424306, WDS J17184-3425
Database references
SIMBADdata

WR 86 is a visual binary in the constellation Scorpius consisting of a Wolf-Rayet star and a β Cephei variable. It lies 2° west of NGC 6357 on the edge of the Great Rift in the Milky Way in the tail of the Scorpion.

WR 86 is a binary with two components of equal visual brightness 0.3" apart.[10] One has the emission-line spectrum of a WC7 Wolf-Rayet star, while the other is a B0 giant. Peter Monderen et al. discovered that the star is a variable star, in April 1986.[11] It was given its variable star designation, V1035 Scorpii, in 1997.[12] The blue giant varies slightly in brightness every 3.5 hours. The WR star may also be slightly variable.[5]

The pulsations of the B-type giant are characteristic of a β Cephei variable. Analysis of its pulsations and comparison to the expected properties of a WC7 star suggest that both stars could have evolved without mass exchange. The WR and B stars would have had initial masses of 40 M☉ and 20 M☉ respectively four million years ago.[5]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  4. ↑ 4.0 4.1 Samus, N. N. 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. 
  5. ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 Paardekooper, S. J.; Veen, P. M.; Van Genderen, A. M.; Van Der Hucht, K. A. (2002). "On the variability of the visual binary WR86. WC7 with a β-Cephei companion". Astronomy and Astrophysics 384 (3): 1012. doi:10.1051/0004-6361:20020085. Bibcode: 2002A&A...384.1012P. 
  6. ↑ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246. 
  7. ↑ Van Der Hucht, K. A. (2006). "New Galactic Wolf-Rayet stars, and candidates. An annex to the VIIth Catalogue of Galactic Wolf-Rayet Stars". Astronomy and Astrophysics 458 (2): 453–459. doi:10.1051/0004-6361:20065819. Bibcode: 2006A&A...458..453V. 
  8. ↑ 8.0 8.1 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. Bibcode: 2002yCat.2237....0D. 
  9. ↑ 9.0 9.1 9.2 Sander, A.; Hamann, W.-R.; Todt, H. (2012). "The Galactic WC stars. Stellar parameters from spectral analyses indicate a new evolutionary sequence". Astronomy & Astrophysics 540: A144. doi:10.1051/0004-6361/201117830. Bibcode: 2012A&A...540A.144S. 
  10. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 
  11. ↑ Monderen, P.; De Loore, C. W. H.; van der Hucht, K. A.; van Genderen, A. M. (April 1988). "Short-timescale light variations of the Wolf-Rayet stars WR 46 and WR86". Astronomy and Astrophysics 195: 179-182. Bibcode: 1988A&A...195..179M. https://articles.adsabs.harvard.edu/pdf/1988A%26A...195..179M. Retrieved 16 September 2025. 
  12. ↑ Kazarovets, E. V.; Samus, N. N. (April 1997). "The 73rd Name-List of Variable Stars". Information Bulletin on Variable Stars 4471. Bibcode: 1997IBVS.4471....1K. https://ibvs.konkoly.hu/pub/ibvs/4401/4471.pdf. Retrieved 16 September 2025. 



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