Astronomy:14 Trianguli

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Short description: Star in the constellation Triangulum
14 Trianguli
Triangulum constellation map.svg
Red circle.svg
Location of 14 Trianguli (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: +11.901[1] mas/yr
Parallax (π)7.5319 ± 0.1060[1] mas
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, BD+35°497, FK5 1070, GC 3032, HD 15656, HIP 11784, HR 736, SAO 55635[15]
Database references
SIMBADdata

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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ Roman, Nancy G. (July 1952). "The Spectra of the Bright Stars of Types F5-K5.". The Astrophysical Journal 116: 122. doi:10.1086/145598. ISSN 0004-637X. Bibcode: 1952ApJ...116..122R. 
  4. ↑ 4.0 4.1 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. doi:10.1093/mnras/133.4.475. ISSN 0035-8711. Bibcode: 1966MNRAS.133..475A. 
  5. ↑ 5.0 5.1 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. doi:10.1051/0004-6361:20041272. ISSN 0004-6361. Bibcode: 2005A&A...430..165F. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Griffin, R. F. (1994). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 117: 14 Trianguli". The Observatory 114: 167. Bibcode: 1994Obs...114..167G. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (21 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  9. ↑ 9.0 9.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ 10.0 10.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  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. doi:10.3847/0004-6256/152/6/196. Bibcode: 2016AJ....152..196M. 
  12. ↑ 12.0 12.1 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. ISSN 0004-6361. Bibcode: 1998A&A...339..858D. 
  13. ↑ 13.0 13.1 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. doi:10.1086/191527. ISSN 0067-0049. Bibcode: 1990ApJS...74.1075M. 
  14. ↑ 14.0 14.1 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. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  15. ↑ "*14 Tri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A14+Tri. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  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. doi:10.1093/mnras/204.3.841. ISSN 0035-8711. Bibcode: 1983MNRAS.204..841M. 

Further reading

  • Griffin, R.F. (August 1994). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 117: 14 Trianguli.". The Observatory 114: 167–171. Bibcode: 1994Obs...114..167G. 



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