Photometric and spectroscopic study of flares on Ross 15  

作　　者：Jian-Ying Bai Ali Esamdin Xing Gao Yan Yan Juan-Juan Ren 

机构地区：[1]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [4]CAS Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Research in Astronomy and Astrophysics》2021年第1期67-74,共8页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 11873081);partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS。

摘　　要：We conducted photometric and spectroscopic observations of Ross 15 in order to further study the flare properties of this less observed flare star.A total of 28 B-band flares are detected in 128 hr of photometric observations,leading to a total flare rate of 0.22-0.040.04 h-1,more accurate than that provided by previous work.We give the energy range of the B-band flare(1029.5-1031.5 erg) and the flare frequency distribution(FFD) for the star.Within the same energy range,the FFD is lower than that of GJ 1243(M4)and YZ CMi(M4.5),roughly in the middle of those of three M5-type stars and higher than the average FFDs of spectral types> M6.We performed,for the first time for Ross 15,simultaneous high-cadence spectroscopic and photometric observations,resulting in detection of the most energetic flare in our sample.The intensity enhancements of the continuum and Balmer lines with significant correlations between them are detected during the flare,which is the same as those of other deeply studied flare stars with similar spectral type.

关 键 词：stars:flare stars:activity stars:late-type 

分 类 号：P182.52[天文地球—天文学]