Iota Trianguli

Iota Trianguli, Latinized from ι Trianguli, is a quadruple[2] star system in constellation of Triangulum. The pair have a combined apparent magnitude of 4.95[12] and are approximately 290 light years from Earth.

A light curve for Iota Trianguli, plotted from Hipparcos data[13]
Iota Trianguli
Location of ι Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum
A
Right ascension 02h 12m 22.2797s[1]
Declination +30° 18′ 11.053″[1]
Apparent magnitude (V) 5.32[2]
B
Right ascension 02h 12m 22.5637s[3]
Declination +30° 18′ 12.342″[3]
Apparent magnitude (V) 6.83[2]
Characteristics
A
Spectral type G0 III + G5 III[4]
B−V color index +0.856[5]
Variable type ellipsoidal + RS CVn[6]
B
Spectral type F5V + ?[2]
B−V color index +0.515[5]
Astrometry
A
Proper motion (μ) RA: −64.350[1] mas/yr
Dec.: −59.503[1] mas/yr
Parallax (π)11.3011 ± 0.1024 mas[1]
Distance289 ± 3 ly
(88.5 ± 0.8 pc)
B
Proper motion (μ) RA: −64.414[3] mas/yr
Dec.: −49.913[3] mas/yr
Parallax (π)12.7375 ± 0.5496 mas[3]
Distance260 ± 10 ly
(79 ± 3 pc)
Absolute magnitude (MV)+0.20[7]
Orbit[8]
PrimaryAa
CompanionAb
Period (P)14.73018 days
Semi-major axis (a)0.002[9]″
Eccentricity (e)0.0035
Inclination (i)55 – 58[9]°
Semi-amplitude (K1)
(primary)		54.84 km/s
Semi-amplitude (K2)
(secondary)		56.39 km/s
Orbit[10]
PrimaryBa
CompanionBb
Period (P)2.2365 days
Eccentricity (e)0
Semi-amplitude (K1)
(primary)		95.4 km/s
Semi-amplitude (K2)
(secondary)		101.0 km/s
Details
Aa
Mass2.50[9] M☉
Radius4.0[8] R☉
Luminosity61.7[8] L☉
Temperature4,932[8] K
Rotational velocity (v sin i)32.9[8] km/s
Ab
Mass2.43[9] M☉
Radius1.5[8] R☉
Luminosity10.0[8] L☉
Temperature6,486[8] K
Rotational velocity (v sin i)3.0[8] km/s
Ba
Mass1.58[9] M☉
Bb
Mass1.56[9] M☉
Other designations
TZ Tri, ι Tri, 6 Tri, BD+29°371, HD 13480, HIP 10280, HR 642, SAO 55347, WDS J02124+3018[11]
Database references
SIMBADdata

Both components of ι Trianguli are spectroscopic binaries and the brighter pair is variable. It has been given the variable star designation TZ Trianguli. The variations are due to the ellipsoidal shape of the stars as they rotate, and also it is classified as an RS Canum Venaticorum variable.[14]

Together with 10 Trianguli and 12 Trianguli, it forms part of the obsolete Triangulum Minus.

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  3. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal, 74: 916–919, Bibcode:1969AJ.....74..916H, doi:10.1086/110881.
  5. Myers, J. R.; Sande, C. B.; Miller, A. C.; Warren, W. H.; Tracewell, D. A. (2015), "VizieR Online Data Catalog: SKY2000 Master Catalog, Version 5 (Myers+ 2006)", Vizier Online Data Catalog, Bibcode:2015yCat.5145....0M.
  6. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  7. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  8. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
  9. Tokovinin, Andrei (23 February 2018), "The Updated Multiple Star Catalog", The Astrophysical Journal Supplement Series, 235 (1): 6, arXiv:1712.04750, Bibcode:2018ApJS..235....6T, doi:10.3847/1538-4365/aaa1a5, eISSN 1538-4365.
  10. Luyten, W. J. (July 1936), "A rediscussion of the orbits of seventy-seven spectroscopic binaries", Astrophysical Journal, 84: 85, Bibcode:1936ApJ....84...85L, doi:10.1086/143751.
  11. "iot Tri", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-06-30.
  12. Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R.
  13. "Light Curve", Hipparcos ESA, ESA, retrieved 13 September 2022.
  14. Hall, D. S.; et al. (1980), "6 iota Trianguli: A new variable star", Information Bulletin on Variable Stars, 1764: 1, Bibcode:1980IBVS.1764....1H.
  • Kaler, James B., "6 Trianguli", Stars, University of Illinois, retrieved 2017-07-01.
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