Distance of Three Supernova Remnants from H<scp>i</scp>Line Observations in a Complex Region: G114.3+0.3, G116.5+1.1, and CTB 1 (G116.9+0.2)

Abstract

We present new radio continuum and H I images towards the supernova remnants (SNRs) G114.3+0.3, G116.5+1.1, and G116.9+0.2 (CTB 1) taken from the Canadian Galactic Plane Survey (CGPS). We discuss the dynamics of their H I environment and a possible relationship of these SNRs with each other. We discovered patches of H I emission surrounding G114.3+0.3 indicating a location in the Local arm at a distance of about 700 pc in contrast to previous publications which proposed a Perseus arm location. The other two SNRs have radial velocities of −17 km s −1 (G116.5+1.1) and −27 km s −1 (CTB 1) according to related H I. However, the structure of the H I and its dynamics in velocity space suggest a possible relation between them, placing both remnants at a distance of about 1.6 kpc. CTB 1 appears to be embedded in an H I feature which is moving as a whole towards us with a velocity of about 10 km s −1. Furthermore, the off-centered location of CTB 1 in a large H I bubble indicates that the so-called breakout region of the remnant is in fact due to its expansion towards the low density interior of this bubble. We believe that the progenitor star of CTB 1 was an early B or O-type star shaping its environment with a strong stellar wind in which case it exploded in a Ib or Ic event. Subject headings: supernova remnants, ISM: individual G114.3+0.3, G116.5+1.1,