Further ultraviolet observations of interstellar gas associated with the supernova remnant S 147.

Abstract

The IUE satellite was used to obtain high-resolution ultraviolet observations of the star HD 37318 (B0.5Ve) which lies behind the supernova remnant S 147. High-velocity interstellar absorption lines (>V_LSR< ≅ + 80 km s^-1) were detected which originate in gas associated with the remnant. These lines have been analysed to estimate chemical and physical conditions in the section of S 147 sampled by the present observations. Relatively high electron densities are indicated in the high-veloicity gas toward HD 37318, suggesting a shocked interstellar cloud in the line-of-sight. The supernova remnant is evidently expanding into an inhomogeneous interstellar medium. Low-velocity interstellar CO absorption bands were detected in the ultraviolet spectrum of HD 37318. This indicates that the molecular gas is situated in the vicinity of the remnant.