Flare Statistics of G-type Algol Eclipsing Binaries from Kepler
Li-Ching Huang1*, Han-Yuan Chang1, Wing-Huen Ip1, Ali Luo2, Yihan Song2, Chia-lung Lin1, Wei-Jie Hou1
1Institute of Astronomy, National Central University, Chungli, Taiwan
2National Astronomical Observatory of China, Chinese Academy of Sciences, Beijing, China
* Presenter:Li-Ching Huang, email:lchuang@astro.ncu.edu.tw
Kepler space telescope have observed more than 2600 eclipsing binary systems during 4 years (2009 - 2013). According to the effective temperatures measured by Huber et al. (2014), we selected about 800 systems, which with G-type primary stars (Teff = 5000K..6000K). With the EB lightcurves, we found 60 of them are Algol type binaries with flare activities. LAMOST observed more than 50000 targets in Kepler field, including 13 Algol type EB with G-type primary star and flare activity, and got good quality optical spectra in resolution 1800. The 13 systems are usually with orbital periods shorter than 10 days.
We compare the chromosphere activity (S-index) of G-type EB systems and single G type stars. EB systems with flare activities has a S-index distribution peak at S-index = 0.4, which is higher than the peaks at S-index = 0.2 show in the S-index distributions of EBs without flare record and single stars with and without flare events.


Keywords: Eclipsing Binary, stellar flare, Kepler, LAMOST