Location of ζ Coronae Borealis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Borealis |
| ζ | |
| Right ascension | 15 39 22.247 |
| Declination | +36° 38′ 12.42″ |
| Apparent magnitude (V) | 5.95 |
| ζ | |
| Right ascension | 15 39 22.668 |
| Declination | +36° 38′ 08.78″ |
| Apparent magnitude (V) | 4.99 |
| Characteristics | |
| ζ | |
| Evolutionary stage | Main sequence |
| Spectral type | B9 V |
| ζ | |
| Evolutionary stage | Main sequence |
| Spectral type | B6 V + B7 V |
| Astrometry | |
| ζ | |
| Radial velocity (Rv) | −19.4 km/s |
| Proper motion (μ) | RA: −14.199±0.093 mas/yr Dec.: −3.871±0.128 mas/yr |
| Parallax (π) | 6.2190 ± 0.0685 mas |
| Distance | 524 ± 6 ly (161 ± 2 pc) |
| ζ | |
| Radial velocity (Rv) | −24.3 km/s |
| Proper motion (μ) | RA: −15.624±0.273 mas/yr Dec.: −7.310±0.342 mas/yr |
| Parallax (π) | 6.6433 ± 0.1841 mas |
| Distance | 490 ± 10 ly (151 ± 4 pc) |
| Orbit | |
| Primary | ζA |
| Companion | ζ B |
| Period (P) | 1.72357 days |
| Eccentricity (e) | 0.013 |
| Inclination (i) | 38° |
| Semi-amplitude (K1) (primary) | 109.6 km/s |
| Semi-amplitude (K2) (secondary) | 121.2 km/s |
| Orbit | |
| Primary | ζ AB |
| Companion | ζ C |
| Period (P) | 251.5 days |
| Eccentricity (e) | 0.48 |
| Semi-amplitude (K1) (primary) | 28.5 km/s |
| Details | |
| ζ A | |
| Mass | 3.19 M☉ |
| Rotational velocity (v sin i) | 15 km/s |
| ζ A | |
| Mass | 4.13 M☉ |
| Rotation | 1.7 days |
| Rotational velocity (v sin i) | 46±7 km/s |
| ζ B | |
| Mass | 3.73 M☉ |
| Rotational velocity (v sin i) | 7.5±2 km/s |
| ζ C | |
| Mass | 3.78 M☉ |
| Other designations | |
| 7 Coronae Borealis, HIP 76669, BD+37°2665, CCDM J15394+3638, WDS J15394+3638 | |
| ζ: HR 5833, HD 139891 | |
| ζ: HR 5834, HD 139892 | |
| Database references | |
| SIMBAD | ζ |
| ζ | |
| ζ | |
ζ Coronae Borealis, Latinised as Zeta Coronae Borealis, is the Bayer designation of a double star in the constellation Corona Borealis. The two components are separated by six arc-seconds and share the same Hipparcos catalogue number and Flamsteed designation. Each of the two is also a spectroscopic multiple system, with a total of five stars in the group.
Nomenclature
ζ Coronae Borealis has the Flamsteed designation 7 Coronae Borealis and the Hipparcos catalogue number HIP 76669. As a double star, the brighter component is designated A (e.g. WDS J15394+3638 A) while the fainter of the two is designated B. The brighter star is also known as ζ Coronae Borealis and the fainter as ζ Coronae Borealis.
Each of the pair has its own Bright Star Catalogue and Henry Draper Catalogue numbers: HR 5833 and 5834, and HD 139891 and 139892 for ζ and ζ respectively.
System
ζ Coronae Borealis is a single-lined spectroscopic binary, with an orbital period of about 9.5 days. The nature of the companion is unknown.
The brighter star, ζ Coronae Borealis, is a spectroscopic triple system, consisting of three massive stars. The inner pair orbit in 1.7 days, while the outer pair orbit in 251 days.
References
- ^ 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.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington: 0. Bibcode:1953GCRV..C......0W.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Gordon, K. D.; Mulliss, C. L. (1997). "Zeta$^2$ Coronae Borealis, A Spectroscopic Triple System Including an Asynchronous Close Binary". Publications of the Astronomical Society of the Pacific. 109: 221. arXiv:astro-ph/9611090. Bibcode:1997PASP..109..221G. doi:10.1086/133877. S2CID 14190128.
- ^ "Multiple Star Catalogue". Archived from the original on 2018-11-24. Retrieved 2018-11-23.
- Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
- ^ Tokovinin, A. (2008). "Comparative statistics and origin of triple and quadruple stars". Monthly Notices of the Royal Astronomical Society. 389 (2): 925–938. arXiv:0806.3263. Bibcode:2008MNRAS.389..925T. doi:10.1111/j.1365-2966.2008.13613.x. S2CID 16452670.
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