111 Tauri

From the Science Archives, the open-project database of science information
Jump to navigation Jump to search
111 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 24m 25.46380s[1]
Declination +17° 23′ 00.7166″[1]
Apparent magnitude (V) 5.1149[1]
Spectral type F8 V + K5 V[2]
U−B color index −0.05[3]
B−V color index 0.544[1]
Variable type BY Dra[3]
Radial velocity (Rv)+37.8[4] km/s
Proper motion (μ) RA: +251.05[1] mas/yr
Dec.: −7.99[1] mas/yr
Parallax (π)69.51 ± 0.38[1] mas
Distance46.9 ± 0.3 ly
(14.39 ± 0.08 pc)
Absolute magnitude (MV)3.49 ± 0.06[5]
111 Tau A
Mass1.08[5] M
Radius1.67 ± 0.06[5] R
Diameter1.67 ± 0.06[5] D
Luminosity1.845[6] L
Surface gravity (log g)4.24[7] cgs
Temperature6,015[7] K
Metallicity [Fe/H]−0.14[7] dex
Rotation3.503±0.006 d[8]
Rotational velocity (v sin i)16.0[9] km/s
Age20–50[10] Myr
Other designations
111 Tau, Gl 202, HR 1780, BD+17° 920, HD 35296, LTT 11642, SAO 94526, HIP 25278.[3]
Database references

111 Tauri is a wide binary star[2] system in the constellation Taurus. It is located at a distance of about 47 light years from the Sun. Primary component A is a main sequence star with a stellar classification of F8V. The secondary component B (Gliese 201) is a K-type main sequence star.[2] The primary is larger and more luminous than the Sun, with about 130% of the Sun's radius and 185% of the Sun's luminosity. The apparent magnitude of 5.1 indicates it is a faint star that can be viewed by the naked eye under good, dark-sky conditions.

The metallicity of the primary star, which measures the proportion of elements other than hydrogen and helium, is similar to the Sun. Estimates of [Fe/H], which is the logarithm of the ratio of iron to hydrogen as compared to the Sun, range from a low of −0.14 to a high of 0.05.[7][11] This star shows an unusually high content of Lithium, which remains unexplained.[11] Age estimates for this star range from 3.6 to 3.76 billion years.[4][12] however the most recent age determination indicates a very young star with an age of 20 to 50 million years.[10] It is a prominent X-ray source.[11]

This star is rotating relatively rapidly, completing a rotation along the equator every 3.5 days[8] as compared to 25 days for the Sun. It is also undergoing differential rotation in which the rotation velocity varies by latitude.[13]

This star was examined for an excess of infrared emission that could indicate it has a circumstellar debris disk of dust, but no significant excess was observed.[12] The space velocity components of this star are [U, V, W] = [−36.94, −14.63, 7.63] km/s.[14] It shares a common proper motion with HIP 25220, an active star with stellar classification K4V. Both stars are members of the Hyades stellar kinematic group of co-moving stars.[11]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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.
  2. 2.0 2.1 2.2 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.
  3. 3.0 3.1 3.2 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  4. 4.0 4.1 Holmberg, J.; Nordstrom, 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.
  5. 5.0 5.1 5.2 Fuhrmann, Klaus (February 2008), "Nearby stars of the Galactic disc and halo - IV", Monthly Notices of the Royal Astronomical Society 384 (1): 173–224, Bibcode 2008MNRAS.384..173F, doi:10.1111/j.1365-2966.2007.12671.x
  6. Takeda, Yoichi (April 2007). "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database". Publications of the Astronomical Society of Japan 59 (2): 335–356. Bibcode 2007PASJ...59..335T. doi:10.1093/pasj/59.2.335.
  7. 7.0 7.1 7.2 7.3 Chen, Y. Q.; Nissen, P. E.; Zhao, G.; Zhang, H. W.; Benoni, T. (February 2000). "Chemical composition of 90 F and G disk dwarfs". Astronomy and Astrophysics Supplement 141: 491–506. arXiv:astro-ph/9912342. Bibcode 2000A&AS..141..491C. doi:10.1051/aas:2000124.
  8. 8.0 8.1 Hempelmann, A. et al. (2016). "Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability". Astronomy and Astrophysics 586: A14. Bibcode 2016A&A...586A..14H. doi:10.1051/0004-6361/201526972. https://www.aanda.org/articles/aa/full_html/2016/02/aa26972-15/aa26972-15.html.
  9. Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009). "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo". Astronomy and Astrophysics 493 (3): 1099–1107. Bibcode 2009A&A...493.1099S. doi:10.1051/0004-6361:200810377. http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2.
  10. 10.0 10.1 Waite, I. A. et al. (2015). "Magnetic fields on young, moderately rotating Sun-like stars – I. HD 35296 and HD 29615". Monthly Notices of the Royal Astronomical Society 449: 8–24. arXiv:1502.05788. Bibcode 2015MNRAS.449....8W. doi:10.1093/mnras/stv006. https://academic.oup.com/mnras/article/449/1/8/1295578.
  11. 11.0 11.1 11.2 11.3 Makarov, V. V.; Zacharias, N.; Hennessy, G. S. (November 2008). "Common Proper Motion Companions to Nearby Stars: Ages and Evolution". The Astrophysical Journal 687 (1): 566–578. arXiv:0808.3414. Bibcode 2008ApJ...687..566M. doi:10.1086/591638.
  12. 12.0 12.1 Trilling, D. E. (February 2008). "Debris Disks around Sun-like Stars". The Astrophysical Journal 674 (2): 1086–1105. arXiv:0710.5498. Bibcode 2008ApJ...674.1086T. doi:10.1086/525514.
  13. Reiners, A. (January 2006). "Rotation- and temperature-dependence of stellar latitudinal differential rotation". Astronomy and Astrophysics 446 (1): 267–277. arXiv:astro-ph/0509399. Bibcode 2006A&A...446..267R. doi:10.1051/0004-6361:20053911.
  14. Montes, D. (November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society 328 (1): 45–63. arXiv:astro-ph/0106537. Bibcode 2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x.

Add your comment
The Science Archives welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

As a reminder, article comments are only for discussions on how to improve the article. Please direct other comments to a user's talk page. Please be formal and do not use excessive uppercase. Please be advised you may receive an automatic block if you break the article comments policy. For information regarding what is acceptable/not acceptable in article comments, please message Icons-flag-ru.png Joey (talk), Natalia (talk), Icons-flag-fr.png ynoss (talk), or Icons-flag-ca.png Daniel (older account/talk).