Collimation of stellar jets: Constraints from the observed spatial structure. I - Data analysis methods. II - Observational results

Details Collimation of stellar jets: Constraints from the observed spatial structure. I - Data analysis methods. II - Observational results Collimation of stellar jets: Constraints from the observed spatial structure. I - Data analysis methods. II - Observational results

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..733r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 733-761. Research supported by NSERC and German-Iris

Astronomy and Astrophysics

Astrophysics

31

Emission Spectra, Herbig-Haro Objects, Interstellar Matter, Pre-Main Sequence Stars, Stellar Mass Ejection, Charge Coupled Devices, Collimation, Fast Fourier Transformations, Jet Flow

Scientific paper

Deconvolution methods are listed which facilitate the extraction of spatial-structure data regarding jets from young stellar objects. Emphasis is placed on a 1D technique for determining jet widths for marginally resolved jets and on the utilization of the method for observed jets. The jet from the Herbig-Haro object 34 is studied and described in terms of its brightest region and constant jet width. The jet does not become narrow near the source which suggests that the initial opening angle be large to account for the assumed zero width at the origin. The collimation mechanism and other features suggested by the data analysis are further investigated by studying deconvolved CCD images from a sample of 15 young stellar objects. The flows are poorly collimated near their sources, although higher degrees of collimation are noted on scales of 1000-10,000 AU. The variety of morphologies observed and the importance of environmental effects in jet structure are two significant conclusions of the paper.

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