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Paper: Rotational Evolution of Low Mass Post-T Tauri Stars at 10-30 Myr\footnotemark
Volume: 472, New Quests in Stellar Astrophysics III: A Panchromatic View of Solar-like Stars, With and Without Planets
Page: 169
Authors: Pinzón, G.; Rodríguez, J.
Abstract: We present a complementary study to those presented by Scholz et al. (2007) of rotation and chromospheric activity for a sample of 33 young low-mass stars of the southern hemisphere with spectral types G-K belonging to the stellar associations: TWA Hya (∼10 Myr), BPMG (∼11 Myr), Upper Centaurus Lupus (UCL, ∼21 Myr), Lower Centarus Crux (LCC, ∼23 Myr), and Tucana-Horologium (THA, ∼30 Myr). Using CaII infrared triplet (IRT) chromospheric lines analysis of FEROS spectra, we detected a clear decay of the chromospheric activity with age. The rotation — activity relation shows prominent differences with those observed in main sequence stars indicating that young low-mass stars generate their magnetic fields in a different way. Theoretical predictions using a time-dependent stellar spin evolution model were also done and confirm that such kind of spin up is a consequence of the disappearance of the disks at the beginning of the post T Tauri stage.
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