By Rainer Wehrse

To get a pretty sensible photo of the constitution and evolution of stars one must recognize properly the abundances of chemical components and their isotopes within the stellar surroundings and within the galactic atmosphere of the celebs. The articles gathered during this quantity supply a contemporary overview of the abundance accuracies for main-sequence stars. After a normal creation within the first half the accuracies of atomic transition chances, ionization and excitation cross-sections, and line huge- ening information are mentioned. within the moment half the categorical difficulties and effects for various stellar varieties are provided, and, eventually, an summary at the probabilities of abundance determinations for stars outdoors the Galaxy is given.

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At this point the term responsivity s is introduced which is the ratio of the detector output to the detector input. Whereas the detector input is a radiometric quantity, the detector output is usually an electrical quantity, for example current, voltage, or change in resistance. In order to optimize the responsivity of a thermopile one has to maximize the Seebeck coefficient of the two materials used for each thermocouple, the thermal resistance between the receiver and the environment, and the absorptance of the surface.

Conf. Ser. 92 (1989) 73. : Absolute radiometry, San Diego: Academic Press, 1989. : Inst. Phys. Conf. Ser. 92 (1989) 11. : Rev. Sci. Instrum. 61 (1990) 1743. : Metrologia 28 (1991) 121. : Rev. Sci. Instrum. 62 (1991) 318. : Metrologia 30 (1993) 297–303. : Laser in Forschung und Technik, Berlin: Springer-Verlag, 1996, p. 730. : Metrologia 32 (1995/96) 535–543. : Metrologia 32 (1995/96) 411–417. : Metrologia 32 (1995/96) 419–424. 96Fox 96Sap 96Wen Landolt-B¨ ornstein New Series VIII/1A1 Ref. p. 2 Beam characterization B.

1 Fundamentals of the semiclassical laser theory Homogeneous broadening 31 Inhomogeneous broadening ∆ w L,inh ∆ w L,h 1 0 wA Frequency w wR Fig. 15. Spectrum of an inhomogeneously and homogeneously broadened laser transition in steady state. Total gain factor GRV vs. frequency of the radiation field. mechanical fluctuations [00Dav]. In the case of solid-state lasers spatial hole burning will influence the spectral behavior and can produce even for homogeneous transitions multi-mode oscillation [63Tan, 66Men].

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Accuracy of Element Abundances from Stellar Atmospheres by Rainer Wehrse
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