2022MNRAS.509.2234B -
Mon. Not. R. Astron. Soc., 509, 2234-2248 (2022/January-2)
Kinematics and structure of ionized gas in the UCHII regions of W33 main.
BEILIS D., BECK S. and LACY J.
Abstract (from CDS):
High mass proto-stars create Ultra-Compact H II regions (UCHII) at the stage of evolution when most of the accretion is finished but the star is still heavily embedded in molecular material. The morphologies of UCHII regions reflect the interactions of stellar winds, stellar motions, and density structure in the molecular cloud; they are complex and it has been very difficult to interpret them. We here present data obtained with TEXES on the NASA IRTF of the [Ne II] emission line in the proto-cluster of young OB stars in W33 Main. The data cube has a spatial resolution of ∼1.4 arcsec and true velocity resolution ∼ 4 km s –1; with Aλ ∼ 0.02AV it is relatively unaffected by extinction. We have run 3D hydrodynamic and line profile simulations, using PLUTO and RADMC-3D, of the gas structures created by multiple windy stars moving relative to each other through the ambient cloud. By iterative comparison of the data cube and the simulations, we arrive at models that reproduce the different morphology and kinematic structure of each UCHII region in W33 Main. The results indicate that each sub-source probably holds multiple exciting stars, permitting an improved view of the stellar population, and finds the stellar trajectories, which may determine the dynamical development of the proto-cluster.
Abstract Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
Journal keyword(s):
methods: numerical - stars: formation - ISM: H ii regions - ISM: kinematics and dynamics
Status at CDS
:
Examining the need for a new acronym.
Simbad objects:
6
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2022MNRAS.509.2234B and select 'bookmark this link' or equivalent in the popup menu