ABSTRACT We present the results of a study aiming at retrieving fundamental parameters M dwarfs from spectra secured with SPIRou, near-infrared high-resolution spectropolarimeter installed Canada–France–Hawaii Telescope (CFHT), in framework SPIRou Legacy Survey (SLS). Our relies on comparing observed two grids synthetic spectra, respectively, computed PHOENIX and MARCS model atmospheres, ultima...

Aiming to delineate the physical framework of blazars, we present an effective method estimate four important parameters based on idea proposed by \citet{BK95}, including upper limit central black hole mass $M$, Doppler factor $\delta$, distance along axis site $\gamma$-ray production $d$ (which then can be transformed into location $\gamma$-ray-emitting region $R_{\gamma}$) and propagation ang...