36 Ophiuchi: Difference between revisions
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The primary and secondary stars are nearly identical orange [[main sequence]] dwarves of [[spectral type]] K0/K1 and the tertiary star is an orange [[main sequence]] dwarf of [[spectral type]] K5. |
The primary and secondary stars are nearly identical orange [[main sequence]] dwarves of [[spectral type]] K0/K1 and the tertiary star is an orange [[main sequence]] dwarf of [[spectral type]] K5. |
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Star C is separated from the A-B pair by 700 [[arc second]]s, compared to a minimum of 4.6 arcsec for A-B, so it has a negligible effect |
Star C is separated from the A-B pair by 700 [[arc second]]s, compared to a minimum of 4.6 arcsec for A-B, so it has a negligible effect on the movements of the A-B pair. Both A and B have active [[chromosphere]]s. |
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==See also== |
==See also== |
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* {{cite web | |
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url=http://www.ari.uni-heidelberg.de/aricns/cnspages/4c01381.htm | |
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Revision as of 23:36, 31 December 2006
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Ophiuchus |
Right ascension | AB: 17h 15m 21s C: 17h 16m 13.4s |
Declination | AB: -26° 36' 10" C: -26° 32' 46" |
Apparent magnitude (V) | 5.05/5.08/6.34 |
Characteristics | |
Spectral type | K0 Ve/K1 Ve/K5 V |
U−B color index | 0.51(AB)/1.04 |
B−V color index | 0.86(AB)/1.15 |
Variable type | ? |
Astrometry | |
Radial velocity (Rv) | +0.0/+0.5/-0.6 km/s |
Proper motion (μ) | RA: -473.69 mas/yr Dec.: -1143.93 mas/yr |
Parallax (π) | 167.51 ± 0.75 mas |
Distance | 19.47 ± 0.09 ly (5.97 ± 0.03 pc) |
Absolute magnitude (MV) | 6.17/6.20/7.46 |
Orbit | |
Companion | 36 Ophiuchi B |
Period (P) | 568.9 yr |
Semi-major axis (a) | 14.7″ |
Eccentricity (e) | 0.922 |
Inclination (i) | 99.6° |
Longitude of the node (Ω) | -83.6° |
Periastron epoch (T) | 1763.39 |
Details | |
Mass | 0.85/0.85/0.71 M☉ |
Radius | 0.81/0.81/0.72 R☉ |
Luminosity | 0.28/0.27/0.09 L☉ |
Temperature | 5125/5100/4550 K |
Metallicity | A: 50-98%Sun B: 120-250%Sun C: 46-100%Sun |
Rotation | ? |
Age | ? years |
Other designations | |
36 Ophiuchi is a triple star system 19.5 light years away from Earth. It is in constellation Ophiuchus.
The primary and secondary stars are nearly identical orange main sequence dwarves of spectral type K0/K1 and the tertiary star is an orange main sequence dwarf of spectral type K5.
Star C is separated from the A-B pair by 700 arc seconds, compared to a minimum of 4.6 arcsec for A-B, so it has a negligible effect on the movements of the A-B pair. Both A and B have active chromospheres.
See also
References
- A.W. Irwin et al, "36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities", Publications of the Astronomical Society of the Pacific, July, 1996.
- G. Cayrel de Strobel, Y. Lebreton, M.-N. Perrin, R. Cayrel, "A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi", Astronomy and Astrophysics, vol. 225, no. 2, Nov. 1989, p. 369-380.
External links
- "36 Ophiuchi". SolStation.
{{cite web}}
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suggested) (help) - "HD 156026". ARICNS.
{{cite web}}
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