The Optical Proper Motions of HH 7-11 and Cepheus E

摘要: A key ingredient in understanding the dynamics of stellar outflows is their proper motion. We have used optical images [S II] emission at 6717/6731 and red Digitized Palomar Observatory Sky Survey (DSS) plates to determine motion HH 7–11 system knot Cep E (HH 377). The DSS plate measurements span nearly 37 years for both 377 a wide field view, which allows an accurate determination motions despite relatively low angular resolution. images, with higher resolution, cover shorter period, 7 4 years, respectively, been complement measurements. From we found that has 0031 ± 0003 yr-1 P.A. = 206°; i.e., it moving away from IRAS 230111+63, distance 730 pc corresponds tangential velocity 107 14 km s-1. values obtained are consistent these Similarly, range 0015 0009 9) 0044 0007 11), flow SVS 13 mean ~ 136°. At 330 pc, correspond velocities ~25–70 s-1, comparable original by Herbig & Jones (1983). CCD again motions, although detail there some differences, particularly 10.