WR 86

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
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension  17h 18m 23.06137s[1]
Declination 34° 24 30.6308[1]
Apparent magnitude (V) 9.27[2]
Characteristics
Evolutionary stage Wolf-Rayet star
Spectral type WC7 + B0III[3]
Apparent magnitude (J) 7.436[4]
Apparent magnitude (K) 6.666[5]
U−B color index 0.07[6]
B−V color index +0.63[6]
Variable type β Cep[2]
Astrometry
Proper motion (μ) RA: 0.92[1] mas/yr
Dec.: 4.80[1] mas/yr
Parallax (π)1.84 ± 1.62[1] mas
Distance2,100 ± 800[3] pc
Absolute magnitude (MV)4.3 + 4.3[3]
Details
WR
Radius10[7] R
Luminosity200,000[3][7] L
Temperature56,000[7] K
B
Mass19 M
Luminosity63,000[3] L
Temperature31,405[3] K
Age4.0[3] 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 binary with two components of equal visual brightness 0.3" apart.[8] One has the emission-line spectrum of a WC7 Wolf-Rayet star, while the other is a B0 giant. The blue giant varies slightly in brightness every 3.5 hours. The WR star may also be slightly variable.[3]

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.[3]

References

  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  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.
  3. 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.
  4. Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally Published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C.
  5. 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. arXiv:astro-ph/0609008. Bibcode:2006A&A...458..453V. doi:10.1051/0004-6361:20065819.
  6. 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.
  7. 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.
  8. 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.
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