Abstract Details
| Name: Jeewan Chandra Pandey Affiliation: ARIES Conference ID: ASI2015_392 Title : X-ray flares on two active stars pi1 UMa and 47 Cas Authors and Co-Authors : Subhajeet Karmakar Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : We investigate the properties of quiescent and flaring coronae of active stars $\pi^1$ UMa and 47 Cas using XMM-Newton observation. For both system the quiescent state coronae consist two temperatures, which are less than 10 MK. The quiescent state X-ray luminosity of $Ppi^1$ UMa and 47 Cas are found to be $7.4\times10^{28}$ and 3.54 \times 10^{30} erg s$^{-1}$ ~in 0.3-10.0 energy band, respectively. In case of $\pi^1$ UMa, two flares with X-ray luminosities of $1.2\times 10^{29}$ and $1.1\times 10^{29}$ erg/s were detected during the observation, where temperature corresponding to hot component were increased to 11.3 and 9.6 MK, respectively. However, the time-resolved X-ray spectroscopy of a flare from 47 Cas showed a variable nature of temperature, emission measure and abundances. The maximum temperature during this flare was found to be 72.8 MK. The loop lengths were estimated of the order of $10^{10}$ cm for all flares. Using high resolution X-ray spectra, densities during flares were found to be of the order of $10^{10}$ cm$^{-3}$. |