We investigate the spectral evolution of white dwarfs by considering the effects of hydrogen mass in the atmosphere and convective overshooting above the convec
The multi-frequency light curves of BL Lacertae during 1997.5 – 1999.5 have been modeled by four outbursts,each having a 3-stage evolution in the (S m,νm) pla
CCD photometric observations of the short-period eclipsing binary DZ Lyn were obtained during seven nights in March-April 2008 in the B, V , R c and Ic bands; t
According to recent observational and theoretical progresses,the DUrca process (direct Urca process) may be excluded from the category of neutron star cooling m
We present a new method for determining the age and relative contribution of different stellar populations in galaxies based on the genetic algorithm.We apply t