111 Tauri

111 Tauri

A light curve for V1119 Tauri, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 24m 25.46328s[2]
Declination +17° 23′ 00.7264″[2]
Apparent magnitude (V) 5.0[3]
Characteristics
A
Spectral type F8 V[4]
U−B color index −0.05[5]
B−V color index 0.544[6]
Variable type BY Dra[5]
B
Spectral type K5 V[4]
Astrometry
A
Radial velocity (Rv)+37.8[7] km/s
Proper motion (μ) RA: +250.585[2] mas/yr
Dec.: −7.156[2] mas/yr
Parallax (π)68.5908 ± 0.1040 mas[2]
Distance47.55 ± 0.07 ly
(14.58 ± 0.02 pc)
Absolute magnitude (MV)3.49 ± 0.06[3]
Details
111 Tau A
Mass1.08[3] M☉
Radius1.67 ± 0.06[3] R☉
Luminosity1.845[8] L☉
Surface gravity (log g)4.24[9] cgs
Temperature6,015[9] K
Metallicity [Fe/H]−0.14[9] dex
Rotation3.503±0.006 d[10]
Rotational velocity (v sin i)16.0[11] km/s
Age20–50[12] Myr
Other designations
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
Database references
SIMBADA
B

111 Tauri is a wide binary star[4] 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.[4] 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.[9][13] This star shows an unusually high content of lithium, which remains unexplained.[13] Age estimates for this star range from 3.6 to 3.76 billion years.[7][14] however the most recent age determination indicates a very young star with an age of 20 to 50 million years.[12] It is a prominent X-ray source.[13]

This star is rotating relatively rapidly, completing a rotation along the equator every 3.5 days[10] as compared to 25 days for the Sun. It is also undergoing differential rotation in which the rotation velocity varies by latitude.[15] 111 Tauri is a BY Draconis variable, and has been given the variable star designation V1119 Tauri.[16]

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.[14] The space velocity components of this star are [U, V, W] = [−36.94, −14.63, 7.63] km/s.[17] It is a member of the Hyades stellar kinematic group of co-moving stars.[13]

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  2. ^ a b c d e Cite error: The named reference dr3 was invoked but never defined (see the help page).
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  4. ^ a b c d Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
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  7. ^ a b Cite error: The named reference aaa501_3_941 was invoked but never defined (see the help page).
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  9. ^ a b c d Cite error: The named reference aaas141 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Hempelmann2016 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa493_3_1099 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Waite2015 was invoked but never defined (see the help page).
  13. ^ a b c d Cite error: The named reference apj687_1_566 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference apj674_2_1086 was invoked but never defined (see the help page).
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  16. ^ Cite error: The named reference IVSI was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference mnras328_1_45 was invoked but never defined (see the help page).