Optical evidence for a poorly-collimated wind from Cepheus A

Details Optical evidence for a poorly-collimated wind from Cepheus A Optical evidence for a poorly-collimated wind from Cepheus A

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..206c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 1, p. 206-213

Astronomy and Astrophysics

Astrophysics

23

Gas Jets, Herbig-Haro Objects, Molecular Flow, Optical Flow (Image Analysis), Pre-Main Sequence Stars, Stellar Winds, Astronomical Spectroscopy, Collimation, Emission Spectra, Molecular Clouds

Scientific paper

The relationship between optical outflows, as represented by Herbig-Haro (HH) objects and HH-like jets, and their associated molecular outflows is not well known. While molecular outflows are in many instances poorly collimated, this may not be true of HH outflows and it is certainly not the case with jets. Here we examine, through direct imaging and spectroscopy, the optical flow in the region east of Cepheus A, a well known molecular outflow source. Our images reveal several previously unseen HH objects in this region linked together by a virtual ellipse of HH eimssion. The major axis of this 'ellipse' points directly at what is thought to be the driving source of activity in this area and it is argued that the optical, shocked molecular hydrogen, and radio emission all derive from a poorly collimated wind from Cep A. As with the optical outflow to the west of Cep A, the bow shaped emission, seen in the case of the two brightest HH objects, suggests a clumpy wind at least near the interface between the wind and the ambient material. The idea that there is more than one major outflow direction in the Cep A region is examined. We find that the evidence presented here and at various other wavelenghts supports a simple east-west orientation.

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