OB stars and the structure of the interstellar medium: Cloud formation and effects of different equations of state

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158099· OSTI ID:6757775

Bania, T M; Lyon, J G

The effects of OB stars on the physical state of the interstellar medium have been investigated using a time-dependent numerical simulation which includes explicit two-dimensional hydrodynamics and implicit, coupled radiative transfer and thermodynamics. Using the observed birthrates, OB stars are placed randomly in space and time on an 180 pc square numerical grid where they ionize and push ambient gas for the duration of their main sequence lifetimes. Though they contribute a minuscule amount of ionization, the B stars are efficient excavators of ambient matter because their initial Stroemgren radii are much smaller than the distance that the shock front around the H II region can travel in the stellar lifetime.

• Research Organization: National Astronomy and Ionosphere Center
• OSTI ID: 6757775
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 239:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
EQUATIONS
EQUATIONS OF STATE
FLUID MECHANICS
GRAVITATIONAL COLLAPSE
H2 REGIONS
HYDRODYNAMICS
INTERSTELLAR GRAINS
INTERSTELLAR SPACE
IONIZATION
MAIN SEQUENCE STARS
MASS
MATHEMATICS
MECHANICS
NUMERICAL ANALYSIS
PARTICLES
SPACE
STAR EVOLUTION
STARS
STEADY-STATE CONDITIONS
TWO-DIMENSIONAL CALCULATIONS