<P> 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 . T Tauri stars are pre-main - sequence stars in the process of contracting to the main sequence along the Hayashi track , a luminosity -- temperature relationship obeyed by infant stars of less than 3 solar masses ( M ) in the pre-main - sequence phase of stellar evolution . It ends when a star of 0.5 M develops a radiative zone , or when a larger star commences nuclear fusion on the main sequence . </P>
<P> 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 . T Tauri stars are pre-main - sequence stars in the process of contracting to the main sequence along the Hayashi track , a luminosity -- temperature relationship obeyed by infant stars of less than 3 solar masses ( M ) in the pre-main - sequence phase of stellar evolution . It ends when a star of 0.5 M develops a radiative zone , or when a larger star commences nuclear fusion on the main sequence . </P>
where are t-tauri stars found on the hr diagram
where are t-tauri stars found on the hr diagram
near molecular clouds
near molecular clouds