We present updated results of spectroscopic follow-up observations of a sample of 45 M dwarf candidates identified by Phan-Bao et al. (2003) based on the DENIS photometry and proper motion measurements. Forty one of these are nearby late-M dwarfs (d<30 pc) with spectral types ranging from M5.0 to M8.5 computed from the spectral indices. One contaminant is probably an F-G main sequence star redd...

The least well known structure of the Galaxy is its central region, because of the high extinction, the crowding and the confusion between disk and bulge sources along the line of sight. We show how the structure of the inner Galaxy and the dust distribution can be strongly constrained by using red clump stars as distance indicator. The results of this method applied on the deep near-infrared s...

Abstract In recent years, image defogging has become a research hotspot in the field of digital processing. Through enhancement processing, visual quality foggy images can be significantly improved, and it is also an important part subsequent To overcome limitations traditional dehazing, algorithm for with sky based on segmentation proposed. Firstly, K-means clustering feature analysis, region ...