A detailed optical study of HH 32 and the highly collimated outflow from the T Tauri star AS 353A

Details A detailed optical study of HH 32 and the highly collimated outflow from the T Tauri star AS 353A A detailed optical study of HH 32 and the highly collimated outflow from the T Tauri star AS 353A

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1357h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, June 1986, p. 1357-1371.

Astronomy and Astrophysics

Astronomy

46

Collimation, Flow Geometry, Jet Flow, Stellar Spectra, T Tauri Stars, Visible Spectrum, Charge Coupled Devices, Emission Spectra, H Alpha Line, Line Spectra, Spectral Resolution, Stellar Models, Stellar Spectrophotometry

Scientific paper

The highly collimated bipolar flow from the T Tauri star AS 353A was studied using high-resolution echelle spectroscopy, medium-resolution long-slit spectroscopy, and emission-line CCD imagery. A linear H-alpha emission jet was found in the redshifted side of the flow between AS 353A and HH 32A. The spectra of HH 32A, B, C, and D all show very broad linewidths, and in many cases prominent double-peaked profiles. The high-velocity emission occurs 1.5 arcsec closer to the star than the low-velocity emission for HH 32C, and a similar displacement of 0.2-0.4 arcsec is found for HH 32A. For each HH object the number density appears to be nearly the same as a function of radial velocity, implying that the two velocity components do not arise from different sides of a single shock. The forbidden O III 5007 A line profile of HH 32A differs markedly from the lower-excitation lines in HH 32A, and exhibits only a single broad peak whose width equals that seen in the lower-excitation lines.

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