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• W3099128873 endingPage "A47" @default.
• W3099128873 startingPage "A47" @default.
• W3099128873 abstract "Our goal is to relate the photometric and spectroscopic variability of classical T Tauri stars, of the star-forming cluster NGC 2264, to the physical processes acting in the stellar and circumstellar environment, within a few stellar radii from the star. NGC 2264 was the target of a multiwavelength observational campaign with CoRoT, MOST, Spitzer, and Chandra satellites and observations from the ground. We classified the CoRoT light curves of accreting systems according to their morphology and compared our classification to several accretion diagnostics and disk parameters. The morphology of the CoRoT light curve reflects the evolution of the accretion process and of the inner disk region. Accretion burst stars present high mass-accretion rates and optically thick inner disks. AA Tau-like systems, whose light curves are dominated by circumstellar dust obscuration, show intermediate mass-accretion rates and are located in the transition of thick to anemic disks. Classical T Tauri stars with spot-like light curves correspond mostly to systems with a low mass-accretion rate and low mid-IR excess. About 30% of the classical T Tauri stars observed in the 2008 and 2011 CoRoT runs changed their light-curve morphology. Transitions from AA Tau-like and spot-like to aperiodic light curves and vice versa were common. The analysis of the $Halpha$ emission line variability of 58 accreting stars showed that 8 presented a periodicity that in a few cases was coincident with the photometric period. The blue and red wings of the $Halpha$ line profiles often do not correlate with each other, indicating that they are strongly influenced by different physical processes. Accreting stars have a dynamic stellar and circumstellar environment that can be explained by magnetospheric accretion and outflow models, including variations from stable to unstable accretion regimes on timescales of a few years" @default.
• W3099128873 created "2020-11-23" @default.
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• W3099128873 date "2016-01-25" @default.
• W3099128873 modified "2023-10-17" @default.
• W3099128873 title "CSI 2264: Accretion process in classical T Tauri stars in the young cluster NGC 2264" @default.
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• W3099128873 doi "https://doi.org/10.1051/0004-6361/201526599" @default.
• W3099128873 hasPublicationYear "2016" @default.
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