67 Ophiuchi (67 Oph) is a class B5 Ib[3] (blue supergiant) star in the constellation Ophiuchus. Its apparent magnitude is 3.93[2] and it is approximately 2,000 light years away based on spectroscopy.[5] It is considered to be a member of the open cluster Collinder 359 (Melotte 186).
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 18h 00m 38.71619s[1] |
| Declination | 2° 55′ 53.6324″[1] |
| Apparent magnitude (V) | 3.93[2] |
| Characteristics | |
| Spectral type | B5Ib[3] |
| U−B color index | -0.62[2] |
| B−V color index | +0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | −5.20[4] km/s |
| Proper motion (μ) | RA: +1.15[1] mas/yr Dec.: -9.35[1] mas/yr |
| Parallax (π) | 2.65 ± 0.54 mas[1] |
| Distance | 2020±200 ly (620±60 pc)[5] |
| Absolute magnitude (MV) | −3.5[6] |
| Details | |
| Mass | 12.6±0.4[5] M☉ |
| Radius | 31±4[5] R☉ |
| Luminosity | 39,800+9,200 −7,500[5] L☉ |
| Surface gravity (log g) | 3.03[7] cgs |
| Temperature | 14,700±300[5] K |
| Metallicity [Fe/H] | -0.01[7] dex |
| Rotational velocity (v sin i) | 40[8] km/s |
| Age | 16.6+1.6 −1.5[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
67 Oph has four companions. The closest is a magnitude 13.7 B1 main sequence star at 8.29", designated B. Component C (BD+02°3459) is the brightest close companion, a magnitude 8.1 B2 main sequence star at 54.32". Component D is a magnitude 12.5 star 8.37" from component C. Component E is a magnitude 10.9 star 46.53" from 67 Oph A.[9]
This star was once considered part of the obsolete constellation Taurus Poniatovii, but after the International Astronomical Union officially recognized constellations, it was placed in Ophiuchus.[10]
References
edit- ^ 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. Vizier catalog entry
- ^ a b c d 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.
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ a b c d e f g Weßmayer, D.; Przybilla, N.; Butler, K. (2022-12-01). "Quantitative spectroscopy of B-type supergiants". Astronomy & Astrophysics. 668: A92. arXiv:2208.02692. Bibcode:2022A&A...668A..92W. doi:10.1051/0004-6361/202243973. ISSN 0004-6361.
- ^ 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. S2CID 119257644. Vizier catalog entry
- ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID 53480665.
- ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
- ^ 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. Vizier catalog entry
- ^ Ian Ridpath. "Taurus Poniatovii". Star Tales. Retrieved 2023-11-01.
Further reading
edit- Underhill, A. B. (1960). "Some spectroscopic observations of the supergiants 67 Ophiuchi, 55 Cygni and χ2 Orionis". Publ. Dominion Astrophys. Obs. 11: 353–361. Bibcode:1960PDAO...11..353U.
- Lodieu, N. (2005). "A study of the young open cluster Collinder 359". Astronomische Nachrichten. 326 (10): 1001–1006. Bibcode:2005AN....326.1001L. doi:10.1002/asna.200510436.