T Tauri Stars
An infrared image of the prototype T Tauri star - T Tauri itself. Wisps of dust and gas from the nebula which formed the star can also be seen.
Credit: Atlas Image courtesy of 2MASS/UMass/IPAC-Caltech/NASA/NSF ...
T Tauri stars (TTS) are a class of variable stars named after their prototype - T Tauri. They are found near molecular clouds and identified by their optical variability and strong chromospheric lines.
[edit] Characteristics ...
T Tauri Stars
Late type irregular variables associated with bright or dark nebulosity. The spectrum exhibits emission in both CaII and H lines.
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T Tauri Stars
T Tauri stars are young, irregular, variable stars. They are protostars of 3 solar masses or less, still collapsing and undergoing mass-loss.
T Tauri Stars: Young stars surrounded by gas and dust, believed to be contracting to main sequence stars.
Thermal emission: Radiation emitted due to an object's temperature (e.g., blackbody radiation) or by an ionized gas.
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T TAURI STARS
Cool, young, irregularly variable stars, often associated with gaseous nebulae such as the Orion nebula (M42). The stars have formed relatively recently from within the nebulae and are evolving towards the zero age main sequence.
T Tauri stars are in the short phase of evolution between protostellar collapse and the main sequence. The star shines due to left-over heat from the conversion of gravitational potential energy to heat.
Studies of T Tauri stars, young, pre-fusing solar mass stars believed to be similar to the Sun at this point in its evolution, show that they are often accompanied by discs of pre-planetary matter.
The nearest T Tauri stars are in the Taurus and r Ophiuchus molecular clouds, both ~400 light years away. Indications of stellar winds and jets show that at least some T Tauri stars are interacting with their environments.
T Tauri stars are a kind of variable star whose brightness varies irregularly. Their spectrum has broad and very intense emission lines, probably indicative of violent surface activity.
9. What are T Tauri stars? (Hint)
10. Because stars live much longer than we do, how do astronomers test the accuracy of theories of star formation? (Hint) ...
Astronomers have also found disks of material around a class of very young stars called T Tauri stars (named after the prototype star in the constellation of Taurus). Disks of material seem to be a common attribute of young stars.
T Tauri stars, also known as nebular variables because they are young objects still embedded in nebulosity, are the least violent of these explosive stars. Novas and supernovas are much more dramatic.
Some time lapse images of T Tauri stars. These are images obtained from the Hubble Space Telescope showing the mass ejections due to strong winds from young stars (really still protostars).
Accretion disks have been observed, or theorized to exist, in association with protostars, T Tauri stars, and other very young stars, Vega-type stars, and many interacting binary systems, including U Geminorum stars, novae, symbiotic stars, ...
They are primarily S stars and carbon stars, although Li is also found in T Tauri stars, and is sometimes observed in normal late-type giants. Interstellar Li / H 2 x 10-10.
The constellation contains a number of molecular clouds (called the "Chamaeleon dark clouds") that are forming low-mass T Tauri stars.
A grouping of several T Tauri stars, presumably formed out of the same cloud of interstellar dust and gas.
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The sum total of processes by which humans modify the materials of nature to better satisfy their needs and wants.
The T Tauri stars are known for a variety of reasons to be extremely young.
Studies of T Tauri stars show that they are often accompanied by discs of pre-planetary matter with masses of 0.0010.1 solar masses, with the vast majority of the mass of the nebula in the star itself. The planets formed by accretion from this disk.
T association: A large, loosely bound group of T Tauri stars.
T dwarf: A very-low-mass star at the bottom end of the main sequence with a cool surface and a low luminosity.
T Tauri stars are surrounded by a huge cloud and they are very young, with low surface temperature. They emit most of their light in the infrared region and they appear red.
The brightness and color of a star depends on the its surface temperature, and the star's temperature, at this point in its life, depends on its mass. (T Tauri stars, for example, are in the early stages of life.) ...
 See also: T Tauri Star, Star, Mass, Nebula, Temperature
  
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