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Using simultaneous optical and infrared light curves of disc-bearing youngstars in NGC 2264, we perform the first multi-wavelength structure functionstudy of YSOs. We find that dippers have larger variability amplitudes thanbursters and symmetric variables at all timescales longer than a few hours. Byanalysing optical-infrared colour time-series, we also find that thevariability in the bursters is systematically less chromatic at all timescalesthan the other variability types. We propose a model of YSO variability inwhich symmetric, bursting, and dipping behaviour is observed in systems viewedat low, intermediate, and high inclinations, respectively. We argue that therelatively short thermal timescale for the disc can explain the fact that theinfrared light curves for bursters are more symmetric than their opticalcounterparts.

monthly notices of the royal astronomical society

Towards an understanding of YSO variability: A multi-wavelength analysis  of bursting, dipping, and symmetrically varying light curves of disc-bearing  YSOs