MWC 603, a High-Velocity Symbiotic Star.

The star MWC 603 is a faint symbiotic star, M3ep + 0, at relatively high galactic latitude, and possibly a member of population II. Its light is slightly variable, at least in the ultraviolet. The absorption lines of the M3 star have essentially the same velocity as the emission lines, both permitted and forbidden. The excitation is not so high as in AX Per, but lines of He ii, C iii, N iii, 0 iii and [0 iii], [Ne iii], [Fe v], and possibly [Fe vi] and [Ne iv] are present. The stability of this star contrasts with the large velocity and light-variations found in most symbiotic objects. There is a good correlation between the diffuseness of emission lines and level of excitation.