- Delta Trianguli
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Delta Trianguli Observation data
Epoch J2000.0 Equinox J2000.0Constellation Triangulum Right ascension 02h 17m 03.23016s[1] Declination +34° 13′ 27.2260″[1] Apparent magnitude (V) +4.865[2] Characteristics Spectral type G0V / K3V[3] U−B color index 0.02 B−V color index 0.60[4] Astrometry Radial velocity (Rv) −5.70[4] km/s Proper motion (μ) RA: 1151.83[1] mas/yr
Dec.: −246.89[1] mas/yrParallax (π) 92.73 ± 0.39[1] mas Distance 35.2 ± 0.1 ly
(10.78 ± 0.05 pc)Absolute magnitude (MV) 4.69[2] Details Mass 1.09 M☉ Radius 0.98[5] R☉ Surface gravity (log g) 4.5[6] Temperature 5,600[6] K Metallicity [Fe/H] = −0.39[2] to −0.30[6] Rotational velocity (v sin i) 10.00[4] km/s Age 8.5[7] to 9.0[2] Gyr Orbit[8] Companion Delta Trianguli B Period (P) 10.0200 days Semimajor axis (a) 9.80 ± 0.06 mas Eccentricity (e) 0.020 ± 0.005 Inclination (i) 167 ± 3° Longitude of the node (Ω) 15 ± 9° Other designations Delta Trianguli (δ Tri, δ Trianguli) is a spectroscopic binary star system approximately 35 light-years (11 pc) away in the constellation of Triangulum. The primary star is a yellow dwarf, while the secondary star is thought to be an orange dwarf. The system is one part of a moving group of stars with Zeta Herculis.
Contents
Stellar components
Delta Trianguli A is a yellow dwarf star and with a mass higher than the Sun. The spectral characteristics of the smaller companion Delta Trianguli B are not well determined since the close orbit makes observations difficult, although it may be an orange dwarf of spectral type K3V.[3] This system is part of the Zeta Herculis stellar moving group.
The Delta Trianguli stars orbit their center of mass. Star A orbits approximately 0.045 AU from the center and star B orbits approximately 0.065 AU from the center.[citation needed] They orbit each other every 10.02 days in a nearly circular orbit; the eccentricity of the orbit is only 0.020. The orbit is inclined 167° to our line of sight.[8]
A 2008 search for a tertiary companion to this system using an adaptive optics system on the VLT proved unsuccessful.[10]
See also
- Alpha Centauri
- Binary star
- V4046 Sagitarii
References
- ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c d Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, arXiv:astro-ph/0405198, Bibcode 2004A&A...418..989N, doi:10.1051/0004-6361:20035959
- ^ a b Raghavan, Deepak et al. (September 2010), "A Survey of Stellar Families: Multiplicity of Solar-type Stars", The Astrophysical Journal Supplement 190 (1): 1–42, Bibcode 2010ApJS..190....1R, doi:10.1088/0067-0049/190/1/1
- ^ a b c White, Russel J. et al. (June 2007), "High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun", The Astronomical Journal 133 (6): 2524–2536, Bibcode 2007AJ....133.2524W, doi:10.1086/514336
- ^ Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367: 5211–524, arXiv:astro-ph/0012289, Bibcode 2001A&A...367..521P, doi:10.1051/0004-6361:20000451
- ^ a b c Clegg, R. E. S. (October 1977), "Carbon and nitrogen abundances in F- and G-type stars", Monthly Notices of the Royal Astronomical Society 181: 1–30, Bibcode 1977MNRAS.181....1C
- ^ Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, Bibcode 2009A&A...501..941H, doi:10.1051/0004-6361/200811191
- ^ a b "Sixth Catalog of Orbits of Visual Binary Stars", U.S. Naval Observatory, http://ad.usno.navy.mil/wds/orb6.html, retrieved 2008-06-22
- ^ "del Tri -- Spectroscopic binary", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%401580494, retrieved 2011-09-16
- ^ Tokovinin, A. et al. (May 2006), "Tertiary companions to close spectroscopic binaries", Astronomy and Astrophysics 450 (2): 6811–693, arXiv:astro-ph/0601518, Bibcode 2006A&A...450..681T, doi:10.1051/0004-6361:20054427
External links
- "Delta Trianguli 2". SolStation. http://www.solstation.com/stars2/del-tri2.htm. Retrieved 2008-06-22.
- Kaler, James. "Delta Tri". Stars: Portraits of Stars and their Constellations. University of Illinois. http://stars.astro.illinois.edu/sow/deltatri.html. Retrieved 2011-09-16.
Common proper name Bayer Flamsteed Categories:- Bayer objects
- Flamsteed objects
- Henry Draper Catalogue objects
- HIP objects
- HR objects
- Gliese and GJ objects
- K-type main sequence stars
- Triangulum constellation
- Spectroscopic binaries
- G-type main sequence stars
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