36 Ophiuchi: Difference between revisions
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==References== |
==References== |
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* 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. |
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==Further reading== |
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*{{Citation |last=Irwin |first=Alan W. |last2=Yang |first2=Stephenson L. S. |last3=Walker |first3=Gordon A. H. |lastauthoramp=yes |year=1996 |title=36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities |journal=Publications of the Astronomical Society of the Pacific |volume=108 |issue= |pages=580 |doi=10.1086/133768 |issn= }} |
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* R.A. Wittenmeyer ''et al.'', "Detection Limits from the McDonald Observatory Planet Search Program", ''The Astronomical Journal'', Volume 132, Issue 1, pp. 177-188, July, 2006. |
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| ⚫ | *{{Citation |last=Cayrel de Strobel |first=G. |last2=Lebreton |first2=Y. |last3=Perrin |first3=M.-N. |last4=Cayrel |first4=R. |lastauthoramp=yes |year=1989 |title=A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi |journal=Astronomy and Astrophysics |volume=225 |issue=2 |pages=369–380 |url= |issn= }} |
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*{{Citation |last=Wittenmeyer |first=R. A. |last2=Endl |first2=Michael |last3=Cochran |first3=William D. |last4=Hatzes |first4=Artie P. |last5=Walker |first5=G. A. H. |last6=Yang |first6=S. L. S. |last7=Paulson |first7=Diane B. |lastauthoramp=yes |year=2006 |title=Detection Limits from the McDonald Observatory Planet Search Program |journal=Astronomical Journal |volume=132 |issue=1 |pages=177–188 |doi=10.1086/504942 |issn= }} |
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==External links== |
==External links== |
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Revision as of 00:06, 30 September 2009
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | A: 17h 15m 20.851s B: 17h 15m 20.978s C: 17h 16m 13.3626s[1] |
| Declination | A: −26° 36′ 09.04″ B: −26° 36′ 10.18″ C: −26° 32′ 46.128″[1] |
| Apparent magnitude (V) | 5.29/5.33/6.34[1] |
| Characteristics | |
| Spectral type | K0 V/K1 V/K5 V[1] |
| U−B color index | 0.51(AB)/1.04 |
| B−V color index | 0.86(AB)/1.15 |
| Variable type | C: RS CV |
| Astrometry | |
| Radial velocity (Rv) | -0.6/0.0/-1.6[1] km/s |
| Proper motion (μ) | RA: -488.2/-473/-479.72[1] mas/yr Dec.: -1156.0/-1143/-1123.37[1] mas/yr |
| Parallax (π) | 167.56 ± 1.06 mas[1] |
| Distance | 19.5 ± 0.1 ly (5.97 ± 0.04 pc) |
| 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 | 0.6×109 [2] 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.
Hunt for substellar objects
McDonald Observatory team has set limits to the presence of one or more planets [2] around 36 Ophiuchi A with masses between 0.13 and 5.4 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units, although the outermost stable orbits around either 36 Ophiuchi A or 36 Ophiuchi B are possible not beyond 1.5 Astronomical Units [3].
See also
References
- ^ a b c d e f g h "SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2007-06-19.
- ^ a b Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors Cite error: The named reference "search" was defined multiple times with different content (see the help page).
- ^ 36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities
Further reading
- Irwin, Alan W.; Yang, Stephenson L. S.; Walker, Gordon A. H. (1996), "36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities", Publications of the Astronomical Society of the Pacific, 108: 580, doi:10.1086/133768
{{citation}}: Unknown parameter|lastauthoramp=ignored (|name-list-style=suggested) (help) - Cayrel de Strobel, G.; Lebreton, Y.; Perrin, M.-N.; Cayrel, R. (1989), "A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi", Astronomy and Astrophysics, 225 (2): 369–380
{{citation}}: Unknown parameter|lastauthoramp=ignored (|name-list-style=suggested) (help) - Wittenmeyer, R. A.; Endl, Michael; Cochran, William D.; Hatzes, Artie P.; Walker, G. A. H.; Yang, S. L. S.; Paulson, Diane B. (2006), "Detection Limits from the McDonald Observatory Planet Search Program", Astronomical Journal, 132 (1): 177–188, doi:10.1086/504942
{{citation}}: Unknown parameter|lastauthoramp=ignored (|name-list-style=suggested) (help) - Barnes, Sydney A. (2007), "Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors", The Astrophysical Journal, 669 (2): 1167–1189, doi:10.1086/519295
{{citation}}: Cite has empty unknown parameter:|lastauthoramp=(help)
External links
- "36 Ophiuchi". SolStation. Retrieved 3 November 2005.
{{cite web}}: Unknown parameter|dateformat=ignored (help) - http://arxiv.org/abs/astro-ph/0604171
