Advances in Numerical Simulations of Gaseous Nebulae
نویسندگان
چکیده
منابع مشابه
Evolution of Gaseous Nebulae.
55Swain, F. M., A Blumentals, and N. Prokopovich, "Bituminous and other organic substances in Pre-Cambrian of Minnesota," Am. Assoc. Petrol. Geol. Bull., 42, 173-189 (1958). M Timofeev, B. V., "Spores and phytoplankton from Proterozoic and early Paleozoic of Eurasia," in Proc. 21st Int. Geol. Congr., Copenhagen, Rept. Soviet Geologists, Problem 9, 177-188 (1960) (in Russian; English abstract, p...
متن کاملTime dependent ionization calculations of gaseous nebulae
We developed a new computer code which is able to treat the time dependent photoand collisional ionization of gaseous nebulae together with the consistent energy balance for arbitrary numbers of elements, ions and line transitions. The intention of this paper is to describe the basic numerical methods and a few test calculations as being parts of full spherically symmetric radiation-gasdynamic ...
متن کاملNew advances in numerical simulations of θ-vacuum systems
Quantum Field Theory with topological terms is a special case of complex Euclidean actions: the action is naturally divided in a real part and a pure imaginary one, the latter in the form of i times θ times an integer that depends on the gauge configuration. The same structure is shared by spin systems coupled to imaginary magnetic field: they do not describe physical systems but are neverthele...
متن کاملAn empirical calibration of sulphur abundance in ionised gaseous nebulae
We have derived an empirical calibration of the abundance of S/H as a function of the S23 parameter, defined using the bright sulphur lines of [SII] and [SIII]. Contrary to what is the case for the widely used O23 parameter, the calibration remains single valued up to the abundance values observed in the disk HII regions. The calibration is based on a large sample of nebulae for which direct de...
متن کاملIonization Structure and Spectra of Iron in Gaseous Nebulae
The emission spectra and the ionization structure of the low ionization stages of iron, Fe I–IV, in gaseous nebulae are studied. This work includes: (i) new atomic data: photoionization cross sections, total e-ion recombination rates, excitation collision strengths, and transition probabilities calculated under the Iron Project by the Ohio State atomic-astrophysics group; (ii) detailed study of...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1993
ISSN: 0074-1809
DOI: 10.1017/s0074180900170299