111 Tauri
Encyclopedia
111 Tauri is a single star in the constellation Taurus
. It is located at a distance of about 47 light years from the Sun
. This is a main sequence star with a stellar classification
of F8V. It 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 this 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. It is a prominent X-ray source.
This star is rotating relatively rapidly, completing a rotation along the equator every 4.1 days as compared to 25 days for the Sun. It is also undergoing differential rotation in which the rotation velocity varies by latitude.
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 shares a common proper motion
with HD 25220, an active star
with stellar classification K4V. Both stars are members of the Hyades
stellar kinematic group
of co-moving stars.
Taurus (constellation)
Taurus is one of the constellations of the zodiac. Its name is a Latin word meaning 'bull', and its astrological symbol is a stylized bull's head:...
. It is located at a distance of about 47 light years from the Sun
Sun
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...
. This is a main sequence star with a stellar classification
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
of F8V. It 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
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of 5.1 indicates it is a faint star that can be viewed by the naked eye under good, dark-sky
Dark-sky movement
The dark-sky movement is a campaign by people who want to reduce light pollution so people can see the stars, to reduce the effects of unnatural lighting on the environment, and to cut down on energy usage....
conditions.
The metallicity of this 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. It is a prominent X-ray source.
This star is rotating relatively rapidly, completing a rotation along the equator every 4.1 days as compared to 25 days for the Sun. It is also undergoing differential rotation in which the rotation velocity varies by latitude.
This star was examined for an excess of infrared emission that could indicate it has a circumstellar debris disk
Debris disk
A debris disk is a circumstellar disk of dust and debris in orbit around a star. Sometimes these disks contain prominent rings, as seen in the image of Fomalhaut on the right. Debris disks have been found around both evolved and young stars, as well as at least one debris disk in orbit around a...
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 shares a common proper motion
Proper motion
The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system. It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree. This contrasts with radial velocity, which is the time rate of change in...
with HD 25220, an active star
Stellar magnetic field
A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star. This motion is created through convection, which is a form of energy transport involving the physical movement of material. A localized magnetic field exerts a force on the plasma, effectively...
with stellar classification K4V. Both stars are members of the Hyades
Hyades (star cluster)
The Hyades is the nearest open cluster to the Solar System and one of the best-studied of all star clusters. The Hipparcos satellite, the Hubble Space Telescope, and infrared color-magnitude diagram fitting have been used to establish a distance to the cluster's center of ~153 ly...
stellar kinematic group
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects...
of co-moving stars.