The lithium-rotation correlation for WTTS in Taurus–Auriga |
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| Institution: | 1. EM Strasbourg Business School, University of Strasbourg, France;1. Department of Psychiatry and Human Behavior, Warren Alpert Medical School, Brown University, Box G-BH, Providence, RI 02912, USA;2. Department of Health Services, Policy, and Practice, Brown University School of Public Health, 121 South Main Street, Providence, RI 02903, USA;3. Butler Hospital, 700 Butler Drive, Providence, RI 02906, USA;4. Department of Psychiatry, Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medicine, 3811 O''Hara St., Pittsburgh, PA 15213, USA;5. Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California at Los Angeles, 760 Westwood Plaza, Mail Code 175919, Los Angeles, CA 90095, USA;6. Department of Psychiatry, Sunnybrook Health Sciences Centre, University of Toronto Faculty of Medicine, 2075 Bayview Ave., FG-53, Toronto, ON M4N-3M5, Canada;7. Bradley Hospital, 1011 Veterans Memorial Parkway, East Providence, RI 02915, USA;8. Department of Psychiatry, Nationwide Children''s Hospital and The Ohio State College of Medicine, 1670 Upham Dr., Columbus, OH 43210, USA;9. Beth Israel Deaconess Medical Center, Boston, MA 02115, USA;1. Hot Springs Research Institute of Kanagawa Prefecture, Odawara, Kanagawa, Japan;2. Department of Geosciences, Osaka City University, Osaka, Japan;3. Paleo Lab. Co. Ltd., Izunokuni, Shizuoka, Japan;4. Kanagawa Prefectural Museum of Natural History, Odawara, Kanagawa, Japan;5. Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan;6. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan;7. PANGEA Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia;8. CNRS, Laboratoire Chrono-Environnement Université de Bourgogne-Franche-Comté, Besançon, France |
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| Abstract: | Surface lithium abundance and rotation velocity can serve as powerful and mutually complementary diagnostics of interior structure of stars. So far, the processes responsible for the lithium depletion during pre-main sequence evolution are still poorly understood. We investigate whether a correlation exists between equivalent widths of Li (EW(Li)) and rotation period (Prot) for weak-line T Tauri stars (WTTSs). We find that rapidly rotating stars have lower EW(Li) and the fast burning of Li begins at the phase when star’s Prot evolves towards 3 days among 0.9M⊙ to 1.4M⊙ WTTSs in Taurus–Auriga. Our results support the conclusion by Piau and Turch-Chiéze about a model for lithium depletion with age of the star and by Bouvier et al. in relation to rotation evolution. The turn over of the curve for the correlation between EW(Li) and Prot is at the phase of zero-age main sequence (ZAMS). The EW(Li) decreases with decreasing Prot before the star reaches the ZAMS, while it decreases with increasing Prot (decreasing rotation velocity) for young low-mass main sequence stars. This result could be explained as an age effect of Li depletion and the rapid rotation does not inhibit Li destruction among low-mass PMS stars. |
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