Delta Trianguli
Delta Trianguli, also named Deltoton for component A,[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, Script error: No such module "Lang". (Script error: No such module "Lang".), 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 Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[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
- ^ a b c d e Page Module:Citation/CS1/styles.css has no content.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.
- ^ a b c d Page Module:Citation/CS1/styles.css has no content.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
- ^ a b c d e f Page Module:Citation/CS1/styles.css has no content.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
- ^ a b Page Module:Citation/CS1/styles.css has no content.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
- ^ a b Page Module:Citation/CS1/styles.css has no content.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
- ^ a b Page Module:Citation/CS1/styles.css has no content."Sixth Catalog of Orbits of Visual Binary Stars", U.S. Naval Observatory, archived from the original on 2009-04-12, retrieved 2008-06-22
- ^ a b Page Module:Citation/CS1/styles.css has no content.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.
- ^ Page Module:Citation/CS1/styles.css has no content.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
- ^ a b Page Module:Citation/CS1/styles.css has no content.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
- ^ Page Module:Citation/CS1/styles.css has no content.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
- ^ Page Module:Citation/CS1/styles.css has no content."del Tri -- Spectroscopic binary", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-09-16
- ^ a b Page Module:Citation/CS1/styles.css has no content."IAU Catalog of Star Names". Retrieved 17 June 2025.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Kaler, James, "Delta Tri", Stars: Portraits of Stars and their Constellations, University of Illinois, retrieved 2011-09-16
- ^ Page Module:Citation/CS1/styles.css has no content.Ridpath, Ian. "Star Tales - Triangulum". Retrieved 17 June 2025.
- ^ Page Module:Citation/CS1/styles.css has no content."Deltoton (Δελτωτόν)". All Skies Encyclopaedia. IAU Working Group on Star Names. Retrieved 17 June 2025.
- ^ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日 Script error: No such module "webarchive".
- ^ Page Module:Citation/CS1/styles.css has no content.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
- ^ Page Module:Citation/CS1/styles.css has no content.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
External links
- Page Module:Citation/CS1/styles.css has no content."Delta Trianguli 2". SolStation. Archived from the original on June 16, 2002. Retrieved 2008-06-22.
