Photometric and spectroscopic study of flares on Ross 15

We conducted photometric and spectroscopic observations for Ross 15 in order to further study the flare properties of this less observed star. A total 28 B-band flares are detected 128 hours observations, leading a rate 0.22(+-0.04) hour^-1, more accurate than that provided by previous work. give energy range (10^29.5 - 10^31.5 erg) FFD Within same range, lower GJ 1243 (M4) YZ CMi (M4.5), roughly middle those three M5-type stars higher average FFDs spectral types >= M6. performed, first time 15, simultaneous high-cadence resulting detection most energetic our sample. The intensity enhancements continuum Balmer lines with significant correlations between them during flare, which is other deeply studied similar type.