Large-Scale Ejecta of Z CMa?Proper Motion Study and New Features Discovered

LIIMETS, T.; KRAUS, M.; CIDALE, L.; KARPOV, S.; MARSTON, A.

Galaxies

MDPI

Lugar: Bassel; Año: 2023 vol. 11 p. 64 - 79

Z Canis Majoris is a fascinating early-type binary with a Herbig Be primary and a FU Orionis-type secondary. Both of the stars exhibit sub-arcsecond jet-like ejecta. In addition, the primary is associated with the extended jet as well as with the large-scale outflow. In this study, we investigate further the nature of the large-scale outflow, which has not been studied since its discovery almost three and a half decades ago. We present proper motion measurements of individual features of the large-scale outflow and determine their kinematical ages. Furthermore, with our newly acquired deep images, we have discovered additional faint arc-shaped features that can be associated with the central binary.