Combining literature results with our observations, we find that the reliability of traditional Hα-based criteria to test for accretion is high but imperfect, particularly for low-mass TTS. Among accretors, we find no example of flickering accretion, leading to an upper limit of 2.2% on the duty cycle of accretion gaps assuming that all accreting TTS experience such events. We found no convincing example of passive disks only transition disk and debris disk systems in our sample are non-accreting. We used medium-resolution optical spectroscopy to assess the objects' accretion status and to measure the Hα line. Our goal was to monitor objects that possess a disk but have a weak Hα line, a common accretion tracer for young stars, to determine whether they host a passive circumstellar disk. more We conducted a 12-month monitoring campaign of 33 T Tauri stars (TTS) in Taurus. We conducted a 12-month monitoring campaign of 33 T Tauri stars (TTS) in Taurus.
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