naa a22 4500 51073250X CHVBK 20180411082958.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1134/S1063772913070056 doi (NATIONALLICENCE)springer-10.1134/S1063772913070056 Infrared emission and the destruction of dust in HII regions [Elektronische Daten] [Ya. Pavlyuchenkov, M. Kirsanova, D. Wiebe] The generation of infrared (IR) radiation and the observed IR-intensity distribution at wavelengths of 8, 24, and 100 µm in the ionized hydrogen region around a young, massive star is investigated. The evolution of the HII region is treated using a self-consistent chemical-dynamical model in which three dust populations are included—large silicate grains, small graphite grains, and polycyclic, aromatic hydrocarbons (PAHs). A radiative transfer model taking into account stochastic heating of small grains and macromolecules is used to model the IR spectral energy distribution. The computational results are compared with Spitzer and Herschel observations of the RCW 120 nebula. The contributions of collisions with gas particles and the radiation field of the star to stochastic heating of small grains are investigated. It is shown that a model with a homogeneous PAH content cannot reproduce the ring-like IR-intensity distribution at 8 µm. A model in which PAHs are destroyed by ultraviolet radiation of the star, generating region HII, provides a means to explain this intensity distribution. This model is in agreement with observations for realistic characteristic destruction times for the PAHs. Pleiades Publishing, Ltd., 2013 Pavlyuchenkov Ya Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia aut Kirsanova M. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia aut Wiebe D. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia aut Astronomy Reports Springer US; http://www.springer-ny.com 57/8(2013-08-01), 573-585 1063-7729 57:8<573 2013 57 11444 https://doi.org/10.1134/S1063772913070056 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913070056 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pavlyuchenkov Ya Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 700 1- Kirsanova M. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 700 1- Wiebe D. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 773 0- Astronomy Reports Springer US; http://www.springer-ny.com 57/8(2013-08-01), 573-585 1063-7729 57:8<573 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer