111 Tauri

Wide binary star system in the constellation Taurus Taurus constellation map.svg center 280 right Red circle.svg 10 111 Tauri 180 508 Location of 111 Tauri (circled) Taurus J2000 A 05 24 25.46328 +17 23 00.7264 5.0 B 05 23 38.37950 +17 19 26.8209 7.9 A main sequence F8 V 0.544 −0.05 BY Dra B main sequence K5 V A +37.8 +250.585 −7.156 68.5908 0.1040 3.49 0.06 B 38.03 0.12 +250.984 −5.707 68.7662 0.0246 +7.2 111 Tau A 1.08 1.67 0.06 1.845 6,015 −0.14 3.503 0.006 days 16.0 4.24 20 - 50 111 Tau B 0.72 0.70 0.20 4,757 −0.01 9.6 days 4.3 4.43 445 111 Tau 111 Tau A Gl 202, HR 1780, BD+17°920, HD 35296, SAO 94526, HIP 25278, V1119 Tau 111 Tau B Gl 201, BD+17°917, HD 35171, SAO 94513, HIP 25220 111+Tau A 111+Tau+B B thumb|left|A light curve for V1119 Tauri, plotted from TESS data 111 Tauri is a wide binary star system in the constellation Taurus. It is located at a distance of 48 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. 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 5.0 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. This star shows an unusually high content of lithium, which remains unexplained. Age estimates for this star range from 3.6 to 3.76 billion years. however the most recent age determination indicates a very young star with an age of 20 to 50 million years. It is a prominent X-ray source. This star is rotating relatively rapidly, completing a rotation along the equator every 3.5 days as compared to 25 days for the Sun. It is also undergoing differential rotation in which the rotation velocity varies by latitude. In 1996, Kazimierz Stępień and Edward H. Geyer announced that 111 Tauri is a variable star. It is a BY Draconis variable, and was given the variable star designation V1119 Tauri, in 1997. 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. The space velocity components of this star are [U, V, W] = [−36.94, −14.63, 7.63] km/s. It is a member of the Hyades stellar kinematic group of co-moving stars. References 3400292798990117888 3394298532176344960 2010MNRAS.403.1949K UBV(RI)C JHK observations of Hipparcos-selected nearby stars Koen C. Kilkenny D. Van Wyk F. Marang F. 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Robrade J. González-Pérez J. N. Schneider C. Mittag M. Schmitt J. H. M. M. Astronomy and Astrophysics 2022 661 A24 10.1051/0004-6361/202141020 free 2106.14546 2021A&A...650A..39G A SOPHIE RV search for giant planets around young nearby stars (YNS). A combination with the HARPS YNS survey Grandjean A. Lagrange A. -M. Meunier N. Rubini P. Desidera S. Galland F. Borgniet S. Zicher N. Messina S. Chauvin G. Sterzik M. Pantoja B. Astronomy and Astrophysics 2021 650 10.1051/0004-6361/202039672 free 2106.10754 Category:Taurus (constellation) Category:Binary stars Tauri, 111 Category:BY Draconis variables Tauri, 111 0202 1780 Category:Durchmusterung objects 025278 035296 Tauri, V1119 Category:Hyades Stream Category:F8V stars Category:K5V stars