Dust content in compact HII regions (NGC 7538-IRS1, IRS2, and IRS3)
نویسندگان
چکیده
منابع مشابه
Hydrodynamics of Cometary Compact Hii Regions
We present numerical radiation-hydrodynamic simulations of cometary H II regions for a number of champagne flow and bowshock models. For the champagne flow models we study smooth density distributions with both steep and shallow gradients. We also consider cases where the ionizing star has a strong stellar wind, and cases in which the star additionally has a proper motion within the ambient den...
متن کاملHydrodynamics of Cometary Compact HII Regions
We present numerical radiation-hydrodynamic simulations of cometary H II regions for a number of champagne flow and bowshock models. For the champagne flow models we study smooth density distributions with both steep and shallow gradients. We also consider cases where the ionizing star has a strong stellar wind, and cases in which the star additionally has a proper motion within the ambient den...
متن کاملHydrodynamics of Cometary Compact Hii Regions
We present numerical radiation-hydrodynamic simulations of cometary H II regions for a number of champagne flow and bowshock models. For the champagne flow models we study smooth density distributions with both steep and shallow gradients. We also consider cases where the ionizing star has a strong stellar wind, and cases in which the star additionally has a proper motion within the ambient den...
متن کاملHelium and Hydrogen Line Ratios and The Stellar Content of Compact HII Regions
We present observations and models of the behaviour of the HI and HeI lines between 1.6 and 2.2μm in a small sample of compact HII regions. As in our previous papers on planetary nebulae, we find that the ‘pure’ 1.7007μm 4D–3P and 2.16475μm 7G–4F HeI recombination lines behave approximately as expected as the effective temperature of the central exciting star(s) increases. However, the 2.058μm ...
متن کاملMPIfR Molecular jet simulation with a large precession angle and its application to emission from NGC 7538 IRS1
Recent high resolution bispectrum speckle interferometric observations in the near-infrared have revealed that the area surrounding NGC 7538 IRS1 is associated with a fan-like region that contains several stars and regions of diffuse emission. An interpretation of the speckle, CO, radio continuum, and methanol maser data, which shows the current position angle of the protostar’s accretion disk ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200400116