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J/AJ/124/445            Internal velocities in Orion Nebula         (Doi+, 2002)

Internal velocities in the Orion nebula: large proper-motion features. Doi T., O'dell C.R., Hartigan P. <Astron. J., 124, 445-463 (2002)> =2002AJ....124..445D
ADC_Keywords: Stars, pre-main sequence ; Space velocities Keywords: Herbig-Haro objects - ISM: individual (Orion Nebula) - ISM: jets and outflows - stars: winds, outflows Abstract: The proper motions (tangential velocities) of Herbig-Haro (HH) objects in the Orion Nebula were measured with a ±10km/s accuracy using the Hubble Space Telescope Wide Field Planetary Camera 2 images in [S II], [N II], H, and [O III], taken 4-6yr apart. Seven HH flows in the outer region as well as seven HH objects in the inner region of the BN-KL complex were identified. The H2 finger system was confirmed to be created by an explosive event that took place approximately 1000 yr ago. We found a new HH flow toward the northwest originating from the vicinity of OMC-1S, which may be a part of the low-velocity bipolar flows centered at FIR 4. The proper motion of HH 202 was also measured with high accuracy for the first time. The proper-motion vectors of HH 202 and HH 203/204 are aligned well with their projected symmetric axis, which may indicate that they emanated from the same source. The proper-motion measurements in various emission lines provide generally the same results in the wide range of velocity from 20 to 400km/s, as expected for shocks in a steady state. Description: Our observations were made with the WFPC2 aboard the HST as part of program GO8121. The first (2000 March 30) was to the southeast (GO8121NW) of the Trapezium and the second (2000 September 13) to the northwest (GO8121SE). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 88 9 HST image data table2.dat 74 171 Tangential velocities in the Orion Nebula
See also: J/AJ/111/846 : Orion HST survey (O'Dell+ 1996) J/AJ/127/3456 : Internal velocities in the Orion Nebula (Doi+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Epoch1 First epoch designation 13- 16 F4.2 yr Dt1 ? Time interval between Epoch1 and second epoch GO8121NW (2000 March 30) 18- 49 A32 --- Filt1 Filters of the second epoch GO8121NW 52- 55 F4.2 yr Dt2 ? Time interval between Epoch1 and second epoch GO8121SE (2000 September 13) 57- 88 A32 --- Filt2 Filters of the second epoch GO8121SE
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Region Region designation 17- 24 A8 --- [OW94] Feature designation (1) 26- 31 A6 --- Source Source designation (HH NNN) 33- 39 A7 --- Filt Filter 41- 43 I3 km/s VT Tangential velocity 45- 47 I3 deg PA ? Position angle 49- 50 I2 --- Fig ? Figure number 52- 57 A6 --- Epoch2 Second epoch designation (see table 1) 58 A1 --- --- [/] 59- 67 A9 --- Epoch1 First epoch designation (see table 1) 70- 74 A5 --- Com Comments (2)
Note (1): Name as [OW94] SSs-MSSa. The complete coordinates in J2000 are 05 35 SS.s -05 2M SS. The feature is identified as SSs-MSS HH NNN. Note (2): Comments use the following symbols: S = the feature is not visible in [S II] N = the feature is not visible in [N II] H = the feature is not visible in H O = the feature is not visible in [O III] s = the tangential velocity of the feature is not measurable because of no matching images in both epochs or too much morphological change in [S II] n = the tangential velocity of the feature is not measurable because of no matching images in both epochs or too much morphological change in [N II] h = the tangential velocity of the feature is not measurable because of no matching images in both epochs or too much morphological change in H o = the tangential velocity of the feature is not measurable because of no matching images in both epochs or too much morphological change in [O III]
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 16-May-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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