OB stars and the structure of the interstellar medium - Cloud formation and effects of different equations of state
1980; IOP Publishing; Volume: 239; Linguagem: Inglês
10.1086/158099
ISSN1538-4357
Autores Tópico(s)Astro and Planetary Science
Resumoview Abstract Citations (55) References (62) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS OB stars and the structure of the interstellar medium - Cloud formation and effects of different equations of state Bania, T. M. ; Lyon, J. G. Abstract The effects of OB stars on the physical state of the interstellar medium (ISM) are studied using a time-dependent numerical simulation which includes explicit two-dimensional hydrodynamics and implicit, coupled radiative transfer and thermodynamics. It is shown that in 10 million years the superposition of the radially expanding H II region shock fronts about OB stars produces a clumped distribution of neutral clouds from an initially homogeneous, isothermal medium. The properties of the observed clouds are best reproduced by an ISM with a hydrogen ionization rate of 10 to the -17th/s and with additional heating supplied by photoelectrons ejected from grain surfaces. Depending on the steady-state equation of state, between 0.1 and 0.7 of the total ISM mass is compacted into clouds which ought to collapse gravitationally. Publication: The Astrophysical Journal Pub Date: July 1980 DOI: 10.1086/158099 Bibcode: 1980ApJ...239..173B Keywords: B Stars; Early Stars; Interstellar Gas; O Stars; Stellar Evolution; Stellar Structure; Equations Of State; Gravitational Collapse; H Ii Regions; Magnetohydrodynamics; Radiative Transfer; Statistical Analysis; Stellar Models; Stellar Temperature; Astrophysics full text sources ADS |
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