DEEP H-ALPHA SURVEY OF THE MILKY-WAY .3. THE L=338-DEGREES AREA

The Galactic plane has been observed between I = 337 degrees and l = 3 42 degrees in the frame of an H alpha Survey of the Southern Milky Way . This area is known to be rich in radio sources but poor in H alpha e mission. The analysis of high resolution profiles of the Her emission observed in this direction nevertheless enabled to distinguish 6 diffe rent velocity components: 2 faint layers of diffuse ionized hydrogen a t 0 and -12 km s(-1) (V-LSR), 2 brighter layers at -28 and -39 km s(-1 ) including individual HII regions, a faint patch at -50 km s(-1) and two isolated bright HII regions at -61 km s(-1). Combining these H alp ha observations with stellar and radio data we conclude about the most probable distances for the different components.