WR 86

WR 86

A light curve for V1035 Scorpii, plotted from TESS data
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 17h 18m 23.06137s
Declination −34° 24′ 30.6308″
Apparent magnitude (V) 9.27
Characteristics
Evolutionary stage Wolf-Rayet star
Spectral type WC7 + B0III
Apparent magnitude (J) 7.436
Apparent magnitude (K) 6.666
U−B color index −0.07
B−V color index +0.63
Variable type β Cep
Astrometry
Proper motion (μ) RA: −0.92 mas/yr
Dec.: −4.80 mas/yr
Parallax (π)1.84±1.62 mas
Distance2,100±800 pc
Absolute magnitude (MV)−4.3 + −4.3
Details
WR
Mass~12 M☉
Radius10 R☉
Luminosity200,000 L☉
Temperature56,000 K
B
Mass19 M☉
Luminosity63,000 L☉
Temperature31,405 K
Age4.0 Myr
Other designations
V1035 Scorpii, CD−34°11622, HD 156327, HIP 84655, WDS J17184-3425, 2MASS J17182306−3424306
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. 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. It was given its variable star designation, V1035 Scorpii, in 1997. The blue giant varies slightly in brightness every 3.5 hours. The WR star may also be slightly variable.

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.

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. 1 2 3 4 5 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.
  4. 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.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 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. Bibcode:2002A&A...384.1012P. doi:10.1051/0004-6361:20020085.
  6. ↑ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (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.
  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. arXiv:astro-ph/0609008. Bibcode:2006A&A...458..453V. doi:10.1051/0004-6361:20065819. S2CID 119104786.
  8. 1 2 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. 1 2 3 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. arXiv:1201.6354. Bibcode:2012A&A...540A.144S. doi:10.1051/0004-6361/201117830. S2CID 119182468.
  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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
  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. Retrieved 16 September 2025.
  12. ↑ Kazarovets, E. V.; Samus, N. N. (April 1997). "The 73rd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4471. Bibcode:1997IBVS.4471....1K. Retrieved 16 September 2025.