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Activities in M dwarfs show spectroscopic variability over various timescales ranging from a few seconds to several hours. The time scales of suchvariability can be related to internal dynamics of M dwarfs like magneticactivity, energetic flaring events, their rotation periods, etc. The timevariability in the strengths of prominent emission lines (particularlyH{\alpha} ) is mostly taken as a proxy of such dynamic behavior. In this study,we have performed the spectroscopic monitoring of 83 M dwarfs (M0-M6.5) tostudy the variations in H{\alpha} and H\b{eta} emissions on short-time scales.Low-resolution (resolution around 5.7 angstroms) spectral time series of 3-5minutes cadence over 0.7-2.3 hours were obtained with MFOSC-P instrument on PRL1.2m Mt. Abu telescope, covering H\b{eta} and H{\alpha} wavelengths. Coupledwith the data available in the literature and archival photometric data fromTESS and Kepler/K2 archives, various variability parameters are explored forany plausible systematics with respect to their spectral types, and rotationperiods. Though about 64% of our sample shows statistically significantvariability, it is not uniform across the spectral type and rotation period.H{\alpha} activity strength (LH{\alpha}/Lbol) is also derived and explored forsuch distributions.

Exploring the short-term variability of H{\alpha} and H\b{eta} emissions in a sample of M Dwarfs