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| Paper: |
The Chromospheric Activity of Weak Line T Tauri Stars: Simultaneous Hα and CA II H & K Observations |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
1772 |
| Authors: |
Poncet, A.; Montes, D.; Fernandez-Figueroa, M. J.; Miranda, L. F. |
| Abstract: |
Simultaneous Hα and Ca ii H & K spectroscopic observations are reported here for 20 weak line T Tauri stars (WTTS) with photometric rotational periods well determined. In the WTTS, contrary to the classical T Tauri stars (CTTS), the emission lines are not influenced by the presence of circumstellar disks and accretion processes and the chromospheric contribution to these lines may be determined by means of the spectral subtraction technique. By using these chromospheric excess emissions we will study the flux-flux and rotation-activity relationships in order to get insights into the mechanisms which drive solar-like stellar activity in this kind of low mass pre-main sequence stars. We discuss here in more detail preliminary results for three WTTS: V773 Tau and V410 Tau which present short term chromospheric variability , and LkCa7 which shows strong emission in the Hα, higher Balmer lines (Hdelta, Hepsilon, Hzeta, Heta and Htheta) and Ca ii H & K lines. Very broad wings have been found in the subtracted Hα profile of V773 Tau and V410 Tau, which could be interpreted as arising from microflaring. |
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