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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29610
Title: CSI 2264: Characterizing Young Stars in NGC 2264 with Stochastically Varying Light Curves
Authors: Stauffer, John
Cody, Ann Marie
Rebull, Luisa
Hillenbrand, Lynne A.
Turner, Neal J.
Carpenter, John
Carey, Sean
Terebey, Susan
Morales-Calderón, María
Alencar, Silvia H. P.
McGinnis, Pauline
Sousa, Alana
Bouvier, Jerome
VENUTI, LAURA
Hartmann, Lee
Calvet, Nuria
MICELA, Giuseppina 
FLACCOMIO, Ettore 
Song, Inseok
Gutermuth, Rob
Barrado, David
Vrba, Frederick J.
Covey, Kevin
Herbst, William
Gillen, Edward
Medeiros Guimarães, Marcelo
Bouy, Herve
Favata, Fabio
Issue Date: 2016
Journal: THE ASTRONOMICAL JOURNAL 
Number: 151
Issue: 3
First Page: 60
Abstract: We provide CoRoT and Spitzer light curves and other supporting data for 17 classical T Tauri stars in NGC 2264 whose CoRoT light curves exemplify the “stochastic” light curve class as defined in 2014 by Cody et al. The most probable physical mechanism to explain the optical variability within this light curve class is time-dependent mass accretion onto the stellar photosphere, producing transient hot spots. Where we have appropriate spectral data, we show that the veiling variability in these stars is consistent in both amplitude and timescale with the optical light curve morphology. The veiling variability is also well-correlated with the strength of the He I 6678 Å emission line, predicted by models to arise in accretion shocks on or near the stellar photosphere. Stars with accretion burst light curve morphology also have variable mass accretion. The stochastic and accretion burst light curves can both be explained by a simple model of randomly occurring flux bursts, with the stochastic light curve class having a higher frequency of lower amplitude events. Members of the stochastic light curve class have only moderate mass accretion rates. Their Hα profiles usually have blueshifted absorption features, probably originating in a disk wind. The lack of periodic signatures in the light curves suggests that little of the variability is due to long-lived hot spots rotating into or out of our line of sight; instead, the primary driver of the observed photometric variability is likely to be instabilities in the inner disk that lead to variable mass accretion. <P />Based on data from the Spitzer and CoRoT missions, as well as the Canada-France-Hawaii Telescope (CFHT) MegaCam CCD, and the European Southern Observatory Very Large Telescope, Paranal Chile, under program 088.C-0239. The CoRoT space mission was developed and is operated by the French space agency CNES, with particpiation of ESA’s RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain. MegaCam is a joint project of CFHT and CEA/DAPNIA, which is operated by the National Research Council (NRC) of Canada, the Institute National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii.
URI: http://hdl.handle.net/20.500.12386/29610
URL: https://iopscience.iop.org/article/10.3847/0004-6256/151/3/60
ISSN: 0004-6256
DOI: 10.3847/0004-6256/151/3/60
Bibcode ADS: 2016AJ....151...60S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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