Abstract
Nearby associations or moving groups of Post-T Tauri stars with ages between 10 and 30 Myr are excellent objects for the study of the initial spin up phase during the PMS evolution. An empirical approach is made here to infer their rotation properties and relations to X-ray emission. Three associations with distances less than 100 pc are considered. The TW HYa association (TWA) with an age of 10 Myr, the Beta Pictoris Moving Group (BPMG) with an age of 12 Myr and a combination of Horologium and Tucana associations (30 Myr). Two high and low rotation modes are considered for each association corresponding to high mass 1–2 solar mass and low mass, less than 1 solar mass respectively. Whereas the low mode practically doesn’t change during this interval of ages, the high mode changes drastically. Following this, we propose that the high mode could be used as a fine tuning gyrochronometer for associations. These mean velocity enabled us to examine the behavior of the main indicators of X-ray activity, L x and L x / L bol, with rotation and age.
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de la Reza, R., Pinzón, G. (2003). Post-T Tauri Stars Rotation in Associations. In: Lépine, J., Gregorio-Hetem, J. (eds) Open Issues in Local Star Formation. Astrophysics and Space Science Library, vol 299. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2600-5_22
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DOI: https://doi.org/10.1007/1-4020-2600-5_22
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