36 Ophiuchi: Difference between revisions
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'''36 Ophiuchi''' (or '''Guniibuu''' for A) is a [[triple star]] system 19.5 [[light year]]s from [[Earth]]. It is in the constellation [[Ophiuchus]]. |
'''36 Ophiuchi''' (or '''Guniibuu''' for A) is a [[triple star]] system 19.5 [[light year]]s from [[Earth]]. It is in the constellation [[Ophiuchus]]. |
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The primary and secondary stars are nearly identical orange [[main sequence]] dwarfs of [[spectral type]] K2/K1 |
The primary and secondary stars (also known ad HD 155886) are nearly identical orange [[main sequence]] dwarfs of [[spectral type]] K2/K1. This binary is unusual because its eruptions seems to do not conform to the Waldmeier Effect - i.e. strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.<ref>{{citation|arxiv=1909.12148|year=2019|title=WALDMEIER EFFECT IN STELLAR CYCLES}}</ref> 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 its effect on the movements of the A-B pair is small. A and B have active [[chromosphere]]s. |
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 its effect on the movements of the A-B pair is small. A and B have active [[chromosphere]]s. |
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[[Category:Henry Draper Catalogue objects|155885 5886 6026]] |
[[Category:Henry Draper Catalogue objects|155885 5886 6026]] |
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[[Category:Hipparcos objects|084405 78]] |
[[Category:Hipparcos objects|084405 78]] |
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[[Category:Durchmusterung objects]] |
[[Category:Durchmusterung objects|CD-26 12026]] |
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[[Category:Bayer objects|Ophiuchi, A]] |
[[Category:Bayer objects|Ophiuchi, A]] |
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[[Category:RS Canum Venaticorum variables]] |
[[Category:RS Canum Venaticorum variables]] |
Revision as of 00:48, 21 June 2021
This article needs additional citations for verification. (January 2021) |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | A: 17h 15m 20.851s B: 17h 15m 20.978s C: 17h 16m 13.3624s[1] |
Declination | A: −26° 36′ 09.04″ B: −26° 36′ 10.18″ C: −26° 32′ 46.129″[1] |
Apparent magnitude (V) | 5.08/5.03/6.34[1] |
Characteristics | |
Spectral type | K2 V/K1 V/K5 V[1] |
U−B color index | 0.51(AB)/1.04 |
B−V color index | 0.85(AB)/1.16 |
Variable type | C: RS CVn |
Astrometry | |
Radial velocity (Rv) | −0.6/0.0/−1.6[1] km/s |
Proper motion (μ) | RA: −488.2/−473/−480.06[1] mas/yr Dec.: −1156.0/−1143/−1123.48[1] mas/yr |
Parallax (π) | 167.1 ± 1.1 mas[1] |
Distance | 19.5 ± 0.1 ly (5.98 ± 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 | |
36 Oph A/B | |
Mass | 0.85/0.85 M☉ |
Radius | 0.817 ± 0.016[2]/0.81 R☉ |
Luminosity (bolometric) | 0.33/0.36[note 1] L☉ |
Luminosity (visual, LV) | 0.28/0.30 L☉ |
Temperature | 4,843 ± 134[2]/4,985 ± 20[3] K |
Metallicity | B: –0.31 ± 0.042[3] dex |
Metallicity [Fe/H] | A: –0.20[2] dex |
Age | 0.6-1.8[4][5] Gyr |
36 Oph C | |
Mass | 0.71 M☉ |
Radius | 0.72 R☉ |
Luminosity (bolometric) | 0.20[note 1] L☉ |
Luminosity (visual, LV) | 0.09 L☉ |
Temperature | 4,550 K |
Metallicity | 46-100% Sun |
Other designations | |
36 Oph, WDS J17153-2636 | |
AB: GJ 663, CD−26°12026, GCTP 3908.00, HIP 84405 | |
A: Guniibuu, HR 6402, HD 155886, LHS 437, SAO 185198 | |
B: HR 6401, HD 155885, LHS 438, SAO 185199 | |
C: V2215 Ophiuchi, GJ 664, CD−26°12036, HD 156026, GCTP 3913.00, LHS 439, SAO 185213, HIP 84478 | |
Database references | |
SIMBAD | AB |
A | |
B | |
C | |
Exoplanet Archive | A |
B | |
C | |
ARICNS | A |
B | |
C |
36 Ophiuchi (or Guniibuu for A) is a triple star system 19.5 light years from Earth. It is in the constellation Ophiuchus.
The primary and secondary stars (also known ad HD 155886) are nearly identical orange main sequence dwarfs of spectral type K2/K1. This binary is unusual because its eruptions seems to do not conform to the Waldmeier Effect - i.e. strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.[6] 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 its effect on the movements of the A-B pair is small. A and B have active chromospheres.
Nomenclature
In the Kamilaroi and Euahlayi Aboriginal peoples in modern-day New South Wales, Australia, the star A is called Guniibuu that represents the robin red-breast bird (Petroica boodang). In 2016, the IAU organized a Working Group on Star Names (WGSN)[7] to catalog and standardize proper names for stars. The WGSN approved the name Guniibuu for the star A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.[8]
Hunt for substellar objects
The McDonald Observatory team has set limits to the presence of one or more planets[4] 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 beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.[9]
The star C (or namely HD 156026) is among five nearby paradigms as K-type stars of a type in a 'sweet spot’ between Sun-analog stars and M stars for the likelihood of evolved life, per analysis of Giada Arney from NASA's Goddard Space Flight Center.[10]
See also
Notes
- ^ a b From L=4πR2σTeff4, where L is the luminosity, R is the radius, Teff is the effective surface temperature and σ is the Stefan–Boltzmann constant.
References
- ^ a b c d e f g h "SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2013-08-23.
- ^ a b c Demory, B.-O.; et al. (October 2009), "Mass-radius relation of low and very low-mass stars revisited with the VLTI", Astronomy and Astrophysics, 505 (1): 205–215, arXiv:0906.0602, Bibcode:2009A&A...505..205D, doi:10.1051/0004-6361/200911976
- ^ a b Taylor, B. J. (December 2005), "Statistical Cataloging of Archival Data for Luminosity Class IV-V Stars. III. The Epoch 2004 [Fe/H] and Temperature Catalogs", The Astrophysical Journal Supplement Series, 161 (2): 444–455, Bibcode:2005ApJS..161..444T, doi:10.1086/496885.Vizier catalog entry
- ^ a b Wittenmeyer et al. (2006).
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal, 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785
- ^ WALDMEIER EFFECT IN STELLAR CYCLES, 2019, arXiv:1909.12148
- ^ "IAU Working Group on Star Names (WGSN)". Retrieved 17 September 2018.
- ^ "IAU Catalog of Star Names". International Astronomical Union. Retrieved 2018-09-17.
- ^ Irwin et al. (1996).
- ^
Bill Steigerwald (2019-03-07). ""Goldilocks" Stars May Be "Just Right" for Finding Habitable Worlds". NASA. Retrieved 2020-05-12.
'I find that certain nearby K stars like 61 Cyg A/B, Epsilon Indi, Groombridge 1618, and HD 156026 may be particularly good targets for future biosignature searches,' said Arney.
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, Bibcode:1996PASP..108..580I, doi:10.1086/133768
- 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, Bibcode:1989A&A...225..369C
- 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, arXiv:astro-ph/0604171, Bibcode:2006AJ....132..177W, doi:10.1086/504942
- Barnes, Sydney A. (2007), "Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors", The Astrophysical Journal, 669 (2): 1167–1189, arXiv:0704.3068, Bibcode:2007ApJ...669.1167B, doi:10.1086/519295
External links
- "36 Ophiuchi". SolStation. Retrieved 3 November 2005.
- https://arxiv.org/abs/astro-ph/0604171