2001A&A...371.1118L


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.30CET03:30:29

2001A&A...371.1118L - Astronomy and Astrophysics, volume 371, 1118-1122 (2001/6-1)

The structure and kinematics of the HH 444 photoionized jet in the σ Orionis region.

LOPEZ-MARTIN L., RAGA A.C., LOPEZ J.A. and MEABURN J.

Abstract (from CDS):

HH 444 is a stellar jet which is immersed in the H II region photoionized by σ Orionis. Spatially resolved, high spectral resolution observations of the Hα and [N II] λλ6548, 6584 lines have been obtained for this object. These observations reveal for the first time the detailed velocity structure of the stellar jet and its associated bow-shock. The line profiles are modeled with gasdynamic numerical simulations, using a 3D code that also includes the transfer of the ionizing radiation from an external source (i.e., σ Orionis for the case of HH 444). In order to reproduce the observed characteristics of the line profiles, we find that an axially peaked initial velocity profile for the jet and a non-zero initial opening angle for the flow with a time-variable ejection velocity is required. With these three ingredients we can reproduce the observed ``acceleration'' of the material along the jet beam, the rapid Hα intensity drop for increasing distances from the source, and the knotty structure of the jet, respectively.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - hydrodynamics - shock waves - ISM: individual: HH 444

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 42 HII 05 35 17.3 -05 23 28           ~ 3752 0
2 NAME Ori A MoC 05 38 -07.1           ~ 2698 0
3 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 746 0
4 Haro 5-27 Or* 05 39 39.8261219095 -02 31 21.866213622 14.589   14.30 13.92 13.073 K5.5 59 0
5 V* V603 Ori Or* 05 39 39.8290440126 -02 33 16.042554188 19.253   16.70   13.91 ~ 28 0

    Equat.    Gal    SGal    Ecl

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2020.10.30-03:30:29

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