Detection of Short Timescale Variability in Capella
Vinay Kashyap (SAO/CXC) , Jennifer Posson-Brown (CXC)
Capella is a bright active binary (G1 III/G8 III) whose coronal luminosity has been remarkably steady over many decades of EUV and X-ray observations, and thus has been a frequent target for calibration observations. Numerous studies have attempted to detect intensity variability on it over various timescales, and have found long term variations of . Here, we analyze 205 ks of Capella data obtained for calibration purposes with the HRC-I on Chandra. Capella registers at approx 22 ct/s in this configuration, and due to the high data quality, unambiguously we detect variability on Capella at the 2-7 0.000000e+00vel at timescales of 5-20 ks. This work was supported by NASA Contract NAS8-39073 to the Chandra X-Ray Center.