irregular waves tagged posts

Diagnostics of the pulsations before (red), during (green) and after (blue) the seventh outburst observed on PG 1149+057. The top panel shows the K2 light curve, while the bottom panels show the FT of each subset. Signals exceeding the significance thresholds (see text) are marked with appropriate-colored dots and show differences in the excited pulsation spectra. Amplitudes are essentially all lower after outburst, but subsequently grow (see Figure 5). Significant pulsations are also visible during the brightening event (green squares), and appear at shorter periods (higher frequencies) and higher amplitudes. The top right panel shows the window function of each subset. Credit: http://arxiv.org/pdf/1507.06319.pdf