MIXED EARLY AND LATE-TYPE PROPERTIES IN THE BAR OF NGC-6221 - EVIDENCE FOR EVOLUTION ALONG THE HUBBLE SEQUENCE

Rotation curves and velocity dispersion profiles are presented for bot h the stellar and gaseous components along five different position ang les (PA = 5 degrees, 50 degrees, 95 degrees, 125 degrees, and 155 degr ees) of the nearby barred spiral NGC 6221. The observed kinematics ext ends out to about 80 '' from the nucleus. Narrow and broad-band imagin g is also presented. The radial profiles of the fluxes ratio [N II] (l ambda 6583.4 Angstrom)/H alpha reveal the presence of a ring-like stru cture of ionized gas, with a radius of about 9 '' and a deprojected ci rcular velocity of about 280 km s(-1). The analysis of the dynamics of the bar indicates this ring is related to the presence of an inner Li ndblad resonance (ILR) at 1.3 kpc. NGC 6221 is found to exhibit interm ediate properties between those of the early-type barred galaxies: the presence of a gaseous ring at an ILR, the bar edge located between th e ILR's and the corotation radius beyond the steep rising portion of t he rotation curve, the dust-lane pattern, and those of the late-type g alaxies: an almost exponential surface brightness profile, the presenc e of H alpha regions along all the bar, the spiral-arm pattern. It, is consistent with scenarios of bar-induced evolution from later to earl ier-type galaxies(1).