2000A&A...356.1010W


Query : 2000A&A...356.1010W

2000A&A...356.1010W - Astronomy and Astrophysics, volume 356, 1010-1022 (2000/4-3)

The ortho:para-Htwo ratio in C- and J-type shocks.

WILGENBUS D., CABRIT S., PINEAU DES FORETS G. and FLOWER D.R.

Abstract (from CDS):

We have computed extensive grids of models of both C- and J-type planar shock waves, propagating in dark, cold molecular clouds, in order to study systematically the behaviour of the ortho:para-Htwo ratio. Careful attention was paid to both macroscopic (dynamical) and microscopic (chemical reactions and collisional population transfer in Htwo) aspects. We relate the predictions of the models to observational determinations of the ortho:para-Htwo ratio using both pure rotational lines and rovibrational lines. As an illustration, we consider ISO and ground-based Htwo observations of HH 54. Neither planar C-type nor planar J-type shocks appear able to account fully for these observations. Given the additional constraints provided by the observed ortho:para Htwo ratios, a C-type bowshock, or a C-type precursor followed by a J-type shock, remain as plausible models.

Abstract Copyright:

Journal keyword(s): Magnetohydrodynamics (MHD) - molecular processes - shock waves - ISM: individual objects: HH 54 - ISM: molecules - infrared: ISM: lines and bands

VizieR on-line data: <Available at CDS (J/A+A/356/1010): table2a.dat table2b.dat table2c.dat table2d.dat table2e.dat>

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HH 54 HH 12 55 49.5 -76 56 08           ~ 119 0
2 HH 54K HH 12 55 53.5 -76 56 22           ~ 11 0
3 HH 54E HH 12 55 53.6 -76 56 20           ~ 14 0
4 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 719 2

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2022.07.01-22:19:48

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