Self-consistent grain depletions and abundances I: The Orion Nebula as a test case

Abstract

Atomic species in the interstellar medium (ISM) transition out of their gas phase mainly by depletion onto dust. In this study, we examine if there is any change to the spectral line ratio predictions from a photoionization model of the Orion H II region when the degree of dust depletions is altered according to the most recently published model. We use equations and parameters published by previous works, in order to streamline the calculation of depleted abundances within CLOUDY. Our aim is for CLOUDY users to be able to vary the level of depletion using a single parameter in the input file. This makes it possible to explore predictions for a large range of depletions more efficiently. Finally, we discuss the results obtained for a model of the Orion Nebula when the degree of depletions are manipulated in this way. We found that the intensity of line ratios are significantly affected by depletions onto dust grains. Further, we found that adjusting dust abundances along with depletion affects the structure and the overall temperature of the H${}^{+}$ layer across the H II region.

8 pages, 5 figures

References in corpus (4)

• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• Ionization correction factors and dust depletion patterns in giant HII regions
• On the radial abundance gradients of nitrogen and oxygen in the inner Galactic disc
• Constraining the star formation histories of GRB Host Galaxies from their observed abundance patterns

Cited by in corpus (3)

• Self-Consistent Grain Depletions and Abundances II: Effects on strong-line diagnostics of extragalactic H II regions
• Cloudy-Maraston: Integrating nebular continuum and line emission with the Maraston stellar population synthesis models
• Emission Line Diagnostics for IMBHs in Dwarf Galaxies: Accounting for BH Seeding and ULX Excitation