WR 86

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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☉
Radius~8.5 (SBL) R☉
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 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.[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. ^ a b c d e 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.
  2. ^ a b 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. ^ a b c d e f g h i 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, 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.
  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): 453–459. arXiv:astro-ph/0609008. Bibcode:2006A&A...458..453V. doi:10.1051/0004-6361:20065819. S2CID 119104786.
  6. ^ a b 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. ^ a b c 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.
  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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