Titlebook: On the Formation of the Most Massive Stars in the Galaxy; Roberto J. Galván-Madrid Book 2012 Springer Science+Business Media New York 2012

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Roberto Galván-Madridn of demographic knowledge and the formulation of state population policy from the mid-nineteenth century to the outbreak of the Second World War. Despite the central importance of official statistics for both demographic analysis and population policy, relatively little research has been undertaken

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Introduction to the Scientific Problem,-matter content at present – 23% and 72% respectively [192] – the former only interacts gravitationally and its effects are negligible on scales relevant to the interior of galaxies, while very little is known about the latter. On the other hand, the much smaller share of “normal” atoms in the Unive

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Time Variability of HII Regions: A Signature of Accretion?,y formed massive star is changing in size. In this chapter we present a study of archival VLA observations of the hypercompact H II region G24.78 + 0.08 A1. We found a decrease of ∼ 45% in its 6-cm flux over a 5 year period. Such a decrease indicates a contraction of ∼ 25% in the ionized radius and

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