Difference between revisions of "Triggers:TTau"

From Gaia Science Alerts Working Group
Jump to navigationJump to search
Line 1: Line 1:
== T Tauri stars ==
+
== T Tauri stars and other young variables and transients ==
 
[[File:figure_ttau_mag.png|400px|right|thumb|T Cha - example of TTau star from the ASAS data]]
 
[[File:figure_ttau_mag.png|400px|right|thumb|T Cha - example of TTau star from the ASAS data]]
  

Revision as of 10:21, 26 July 2013

T Tauri stars and other young variables and transients

T Cha - example of TTau star from the ASAS data

T Tauri type stars are very young (<math> <10^7 </math> y), low mass (<math> <3 M^{}_\odot </math>) pre-main sequence objects Appenzeller & Mundt 1989.

Characteristics:

  • irregular and quasi-periodic variations
  • high amplitude (up to 5 mag)
  • may have a phase of quiescence (see figure)
  • absolute magnitude range: M_V=? to ? mag
  • typically do not require a trigger, but watch list of T Tauris would be useful

Below are sample optical spectra of classical T Tauri stars and two FU-ori type eruptive variables.

FRODOspec data from the Liverpool Telescope
FRODOspec data of DG Tau (red), CW Tau (blue) and HL Tau (green)