14 Trianguli

14 Trianguli (14 Tri), also known as HD 15656, is a spectroscopic binary[16] located in the northern constellation Triangulum. It has an apparent magnitude of 5.14,[2] making it faintly visible to the naked eye in ideal conditions. Gaia DR3 parallax measurements place the system 433 light years away,[1] and it is currently approaching the Solar System with a heliocentric radial velocity of −37 km/s.[5] At its current distance, 14 Tri's brightness is diminished by 0.21 magnitude due to interstellar dust.[17] It has an absolute magnitude of −0.46.[6]

14 Trianguli
Location of 14 Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum
Right ascension 02h 32m 06.16977s[1]
Declination +36° 08′ 50.1813″[1]
Apparent magnitude (V) 5.14±0.01[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.78[4]
B−V color index +1.47[4]
Astrometry
Radial velocity (Rv)−36.8±0.3[5] km/s
Proper motion (μ) RA: +45.066 mas/yr[1]
Dec.: +11.901 mas/yr[1]
Parallax (π)7.5319 ± 0.1060 mas[1]
Distance433 ± 6 ly
(133 ± 2 pc)
Absolute magnitude (MV)−0.46[6]
Orbit[7]
Primary14 Tri A
Companion14 Tri B
Period (P)6,257±73 d
Eccentricity (e)0.22±0.04
Periastron epoch (T)2,448,284±166 JD
Argument of periastron (ω)
(secondary)		40±11°
Semi-amplitude (K1)
(primary)		2.27±0.09 km/s
Details
Mass1.85±0.09[8] M☉
Radius40.5±2.1[9] R☉
Luminosity373±11[10] L☉
Surface gravity (log g)1.65[11] cgs
Temperature3,957[12] K
Metallicity [Fe/H]−0.16[13] dex
Rotational velocity (v sin i)2.1±1.2[14] km/s
Other designations
14 Trianguli, AG+35°233, BD+35°497, FK5 1070, GC 3032, HD 15656, HIP 11784, HR 736, SAO 55635[15]
Database references
SIMBADdata

The visible component is an evolved red giant with a stellar classification of K5 III. It has 1.85 times the mass of the Sun,[8] but it has expanded to 40.5 times its girth.[9] It radiates 373 times the luminosity of the Sun[10] from its photosphere at an effective temperature of 3,957 K,[12] giving it an orangish-red hue. 14 Tri is slightly metal-deficient with [Fe/H] = −0.16,[13] and spins modestly with a projected rotational velocity of 2.1 km/s.[14] This is a single-lined spectroscopic binary that completes an eccentric orbit within 17 years. The secondary star has not been detected visually or in the spectrum and is expected to be a low-mass red dwarf or white dwarf.[7] 14 Tri may be part of the Wolf 630 moving group.[18]

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. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Roman, Nancy G. (July 1952). "The Spectra of the Bright Stars of Types F5-K5". The Astrophysical Journal. 116: 122. Bibcode:1952ApJ...116..122R. doi:10.1086/145598. eISSN 1538-4357. ISSN 0004-637X.
  4. Argue, A. N. (1 September 1966). "UBV Photometry of 550 F, G and K Type Stars". Monthly Notices of the Royal Astronomical Society. 133 (4): 475–493. Bibcode:1966MNRAS.133..475A. doi:10.1093/mnras/133.4.475. eISSN 1365-2966. ISSN 0035-8711.
  5. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. eISSN 1432-0746. ISSN 0004-6361. S2CID 17804304.
  6. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  7. Griffin, R. F. (1994). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 117: 14 Trianguli". The Observatory. 114: 167. Bibcode:1994Obs...114..167G.
  8. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (21 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  9. Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
  10. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  11. Maas, Z. G.; Pilachowski, C. A.; Hinkle, K. (28 November 2016). "Chlorine Abundances in Cool Stars". The Astronomical Journal. 152 (6): 196. arXiv:1609.01626. Bibcode:2016AJ....152..196M. doi:10.3847/0004-6256/152/6/196. eISSN 1538-3881.
  12. di Benedetto, G. P. (November 1998). "Towards a fundamental calibration of stellar parameters of A, F, G, K dwarfs and giants". Astronomy and Astrophysics. 339: 858–871. Bibcode:1998A&A...339..858D. ISSN 0004-6361.
  13. McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". The Astrophysical Journal Supplement Series. 74: 1075. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527. eISSN 1538-4365. ISSN 0067-0049.
  14. de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolvedstars". Astronomy and Astrophysics Supplement Series. 139 (3): 433–460. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. eISSN 1286-4846. ISSN 0365-0138.
  15. "*14 Tri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved February 8, 2023.
  16. Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  17. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711.
  18. McDonald, A. R. E.; Hearnshaw, J. B. (1 October 1983). "The Wolf 630 moving group of stars". Monthly Notices of the Royal Astronomical Society. 204 (3): 841–852. Bibcode:1983MNRAS.204..841M. doi:10.1093/mnras/204.3.841. eISSN 1365-2966. ISSN 0035-8711.

Further reading
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