THE KINEMATICS OF HH 34 FROM HST IMAGES WITH A NINE-YEAR TIME BASELINE

Journal Article · Sun Apr 01 04:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/748/2/103· OSTI ID:22016104

Raga, A C; Rodriguez-Gonzalez, A ^[1]; Noriega-Crespo, A; Carey, S J ^[2]; Lora, V ^[3]; Stapelfeldt, K R ^[4]

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1. Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Ap. 70-543, 04510 D.F. (Mexico)
2. SPITZER Science Center, California Institute of Technology, CA 91125 (United States)
3. Astronomisches Rechen-Institut Zentrum fuer Astronomie der Universitaet Heidelberg, Moenchhofstr. 12-14, 69120 Heidelberg (Germany)
4. Jet propulsion Laboratory, California Institute of Technology, MS 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)

We study archival HST [S II] 6716+30 and H{alpha} images of the HH 34 outflow, taken in 1998.71 and in 2007.83. The {approx}9 yr time baseline and the high angular resolution of these observations allow us to carry out a detailed proper-motion study. We determine the proper motions of the substructure of the HH 34S bow shock (from the [S II] and H{alpha} frames) and of the aligned knots within {approx}30'' from the outflow source (only from the [S II] frames). We find that the present-day motions of the knots along the HH 34 jet are approximately ballistic, and that these motions directly imply the formation of a major mass concentration in {approx}900 yr, at a position similar to the one of the present-day HH 34S bow shock. In other words, we find that the knots along the HH 34 jet will merge to form a more massive structure, possibly resembling HH 34S.

• OSTI ID: 22016104
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 748; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
HERBIG-HARO OBJECTS
IMAGES
INTERSTELLAR GRAINS
MASS
PROPER MOTION
SHOCK WAVES
STARS