THE STORY OF T TAURI.

If it acquires no more material, it will end up an A-type main-sequence star resembling brilliant Sirius A. In contrast, T Tauri South b is a smaller star, on track to become the most common stellar type in the galaxy: a humble red dwarf. The high luminosity suggests the star is more massive than most other T Tauri stars, and in the past astronomers have estimated a mass about twice that of the Sun. PROTOSTAR VS. PRE-MAIN-SEQUENCE STAR Most T Tauri stars are young pre-mainsequence stars that were born within the last several million years and are less than 2.5 times as massive as the Sun. Because they are larger than the main-sequence stars they will later become, T Tauri stars appear more luminous, lying above the main sequence on the Hertzsprung-Russell diagram. [Extracted from the article]
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