  We present multiple epochs of near-IR spectroscopy for a sample of 25 young
stars, including T Tauri, Herbig Ae/Be, and FU Ori objects. Using the FSPEC
instrument on the Bok 90-inch telescope, we obtained K-band spectra of the
BrGamma transition of hydrogen, with a resolution of ~3500. Epochs were taken
over a span of >1 year, sampling time-spacings of roughly one day, one month,
and one year. The majority of our targets show BrGamma emission, and in some
cases these are the first published detections. Time-variability is seen in
approximately half of the targets showing BrGamma emission. We compare the
observed variability with expectations for rotationally-modulated accretion
onto the central stars and time-variable continuum emission or extinction from
matter in the inner disk. Our observations are not entirely consistent with
models of rotationally-modulated magnetospheric accretion. Further monitoring,
over a larger number of epochs, will facilitate more quantitative constraints
on variability timescales and amplitudes, and a more conclusive comparison with
theoretical models.
