Search for resolved H-alpha nebulae around symbiotic stars and their formation mechanisms.

摘要: We present the results of Hα-BVRI CCD observations a randomly selected sample 18 southern symbiotic stars (8 D-, 7 S- and 3 yellow-type), aimed to search for spatially resolved HII circumstellar regions. Additional He2-104 (the Southern Crab) have been performed in order evaluate sensitivity adopted instrumentation. An extended region has discovered around D-type He2-147. The shape is ellipsoidal with hints bipolar structure, elongated N-S direction, dimensions 8.1× 6.0 arcsec (at 10% peak intensity), which correspond 27,000 × 20,000 AU at system distance. nebula radiates as much 75% Hα emission central unresolved stellar source