长副周期变星是一类特殊的半规则变星,大量存在于银河系和大小麦哲伦云中,约占渐近巨星分支的25%～30%。该类变星有两个光变周期,短......

Using high signal-to-noise ratio spectra of extrasolar planet-hosting stars, we obtained the atmospheric parameters, acc......

X-ray emission is an important indicator of stellar activity.In this paper,we study stellar Xray activity using the XMM-......

We present a method of 13 late-type main-sequence stars chromospheric flux observation data calculations. These Sun-like......