Aerodynamics part 2. Methods of aerodynamic calculations by Krasnov N.F.

By Krasnov N.F.

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Supernova explosions are most likely to occur in the immediate vicinity of star-forming regions, because the entire lifetime of a massive star can be run through during the lifetime of a typical cloud. The massive star cannot live long enough to get away from the dense cloud region before exploding! Thus supernova shock waves may play a role in stellar formation. Second, interstellar clouds collapse and fragment while storing much of their potential energy as heat. Third, collapse progresses at a rate limited by the ability of the cloud to dissipate its energy and rotational angular momentum.

One interesting development in the search for planets of II. Astronomical Perspective other stars has been the apparent discovery by van de Kamp of a distortion of the sinusoidal character of the motion of Barnard's star, an MS red dwarf that is the nearest star to the Sun except for the alpha Centauri triple-star system. We would caution, however, that these are only plausible interpretations of noisy data from a very difficult measurement. 80 X 105 AU. The problem of detection of any planetary companion arises from its faintness.

Clouds of much cooler (30 to 100 K) neutral atomic hydrogen, referred to by astronomers as HI regions, are common and make up roughly half of the mass of the ISM. ), C2H3OH H \ \ Carbon-bearing radicals and ions CH, CO, C 2 0, C 3 0, CN, CP, CS, C3S, C2, COS, C3, HCO, HCO + , HOCO+, HCNH+, C2S, SiC, SiC2, C4Si, C3N Aldehydes H2CO, CH3CHO, NH2CHO, HCCCHO 1 r gas X V L -4 / \ > j HI clouds (atomic) L A. 19 Structure of the Interstellar Medium. The temperatures and densities of the five "phases" of the ISM are shown.

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