Astronomy:WR 86
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 18m 23.06137s[2] |
| Declination | −34° 24′ 30.6308″[2] |
| Apparent magnitude (V) | 9.27[3] |
| Characteristics | |
| Evolutionary stage | Wolf-Rayet star |
| Spectral type | WC7 + B0III[4] |
| Apparent magnitude (J) | 7.436[5] |
| Apparent magnitude (K) | 6.666[6] |
| U−B color index | −0.07[7] |
| B−V color index | +0.63[7] |
| Variable type | β Cep[3] |
| Astrometry | |
| Proper motion (μ) | RA: −0.92[2] mas/yr Dec.: −4.80[2] mas/yr |
| Parallax (π) | 1.84 ± 1.62[2] mas |
| Distance | 2,100 ± 800[4] pc |
| Absolute magnitude (MV) | −4.3 + −4.3[4] |
| Details | |
| WR | |
| Radius | 10[8] R☉ |
| Luminosity | 200,000[4][8] L☉ |
| Temperature | 56,000[8] K |
| B | |
| Mass | 19 M☉ |
| Radius | ~8.5 (SBL) R☉ |
| Luminosity | 63,000[4] L☉ |
| Temperature | 31,405[4] K |
| Age | 4.0[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[9] 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.[4]
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.[4]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 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.
- ↑ 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.
- ↑ 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.
- ↑ 7.0 7.1 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.
- ↑ 8.0 8.1 8.2 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.
- ↑ 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.
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