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Delta Trianguli

In this article we will be addressing the topic of Delta Trianguli, which has aroused great interest in today's society due to its relevance and impact in various areas. Delta Trianguli is a topic that has generated controversy and debate, as well as aroused the interest of experts and specialists in the field. Along these lines, we will explore different aspects related to Delta Trianguli, examining its origins, evolution, implications and possible solutions. There is no doubt that Delta Trianguli represents a topic of great importance in the current context, so it is essential to deepen its understanding and analysis.

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Delta Trianguli
Location of δ Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension 02h 17m 03.23016s[1]
Declination +34° 13′ 27.2260″[1]
Apparent magnitude (V) +4.865[2]
Characteristics
Spectral type G0V + G9V to K4V[3]
U−B color index +0.02[4]
B−V color index +0.61[4]
Astrometry
Radial velocity (Rv)−5.70[5] km/s
Proper motion (μ) RA: 1151.83[1] mas/yr
Dec.: −246.89[1] mas/yr
Parallax (π)92.73±0.39 mas[1]
Distance35.2 ± 0.1 ly
(10.78 ± 0.05 pc)
Absolute magnitude (MV)4.69[2]
Orbit[6]
CompanionDelta Trianguli B
Period (P)10.02 days
Semi-major axis (a)9.80±0.06 mas
Eccentricity (e)0.020±0.005
Inclination (i)167±3°
Longitude of the node (Ω)15±9°
Details
A
Mass0.884±0.059[7] M☉
Radius0.98[8] R☉
Surface gravity (log g)4.5[9] cgs
Temperature6,215[3] K
Metallicity −0.39[2] to −0.30[9] dex
Rotational velocity (v sin i)10.00[5] km/s
Age8.5[10] to 9.0[2] Gyr
B
Mass0.785±0.044[7] M☉
Temperature4,493[3] K
Other designations
Deltoton, δ Tri, Delta Tri, 8 Trianguli, BD+33°395, GJ 92, HD 13974, HIP 10644, HR 660, SAO 55420, LHS 154, LTT 10770[11]
Database references
SIMBADdata

Delta Trianguli, also named Deltoton,[12] 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. It has an apparent magnitude of +4.87 and forms an optical (line-of-sight) triple with Gamma Trianguli and 7 Trianguli.[13]

Naming

Delta Trianguli, Latinized from δ Trianguli and abbreviated Delta Tri, is the star's Bayer designation.

Deltoton was an ancient Greek name of the constellation Triangulum, so named because the capital Greek letter delta is shaped like a triangle.[14] The IAU Working Group on Star Names approved the name Deltoton for this star on 17 June 2025 and it is now so entered in the IAU Catalog of Star Names.[12] The name was chosen for Delta Trianguli A, because of the "obvious pun" in that its Bayer designation is Delta.[15]

In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of δ Trianguli, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli and γ Trianguli. Consequently, the Chinese name for δ Trianguli itself is 天大將軍十一 (Tiān Dà Jiāng Jūn shíyī, English: the Eleventh Star of Heaven's Great General).[16]

Stellar components

Delta Trianguli A is a main sequence star with a stellar classification of G0V and a mass similar to the Sun.[13] The spectral characteristics of the smaller companion Delta Trianguli B are not well determined since the close orbit makes observations difficult,[17] with estimates of the spectral class ranging from G9V to K4V.[3] The Delta Trianguli stars orbit their center of mass with an estimated separation of 0.106 AU;[13] it is certainly less than one AU.[3] The orbital period is 10.02 days and the eccentricity of the orbit is only 0.020. The orbit is inclined about 167° to the line of sight from Earth.[6]

A 2008 search for a tertiary companion to this system using an adaptive optics system on the VLT proved unsuccessful.[18] Examination of the system in infrared light at 70 μm shows no excess emission that would otherwise indicate the presence of a disk of orbiting dust.[3]

See also

References

  1. ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. ^ 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, S2CID 11027621
  3. ^ a b c d e f Kim, Jinyoung Serena; et al. (October 2005), "Formation and Evolution of Planetary Systems: Cold Outer Disks Associated with Sun-like Stars", The Astrophysical Journal, 632 (1): 659–669, arXiv:astro-ph/0506434, Bibcode:2005ApJ...632..659K, doi:10.1086/432863, S2CID 7324203
  4. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
  5. ^ a b 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, arXiv:0706.0542, Bibcode:2007AJ....133.2524W, doi:10.1086/514336, S2CID 122854
  6. ^ a b "Sixth Catalog of Orbits of Visual Binary Stars", U.S. Naval Observatory, archived from the original on 2009-04-12, retrieved 2008-06-22
  7. ^ a b Piccotti, Luca; Docobo, José Ángel; Carini, Roberta; Tamazian, Vakhtang S; Brocato, Enzo; Andrade, Manuel; Campo, Pedro P (2020-01-03). "A study of the physical properties of SB2s with both the visual and spectroscopic orbits". Monthly Notices of the Royal Astronomical Society. 492 (2). Oxford University Press (OUP): 2709–2721. Bibcode:2020MNRAS.492.2709P. doi:10.1093/mnras/stz3616. ISSN 0035-8711.
  8. ^ 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 (2): 5211–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
  9. ^ a b 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, doi:10.1093/mnras/181.1.1
  10. ^ 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, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511
  11. ^ "del Tri -- Spectroscopic binary", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-09-16
  12. ^ a b "IAU Catalog of Star Names". Retrieved 17 June 2025.
  13. ^ a b c Kaler, James, "Delta Tri", Stars: Portraits of Stars and their Constellations, University of Illinois, retrieved 2011-09-16
  14. ^ Ridpath, Ian. "Star Tales - Triangulum". Retrieved 17 June 2025.
  15. ^ "Deltoton (Δελτωτόν)". All Skies Encyclopaedia. IAU Working Group on Star Names. Retrieved 17 June 2025.
  16. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日 Archived 2011-07-16 at the Wayback Machine
  17. ^ Raghavan, Deepak; et al. (September 2010), "A Survey of Stellar Families: Multiplicity of Solar-type Stars", The Astrophysical Journal Supplement, 190 (1): 1–42, arXiv:1007.0414, Bibcode:2010ApJS..190....1R, doi:10.1088/0067-0049/190/1/1, S2CID 368553
  18. ^ 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, S2CID 8899546
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