By F. D. Kahn (auth.), F. D. Kahn (eds.)
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Extra resources for Investigating the Universe: Papers presented to Zdeněk Kopal on the occasion of his retirement, September 1981
Do HH objects emit intrinsically or are they just reflection nebulae? The latter viewpoint was advanced principally by the Stroms and co-workers (Strom, Strom and Grasdalen 1974; Strom, Grasdalen and Strom 1974; Strom, Strom and Kinman 1974; Vrba, Strom and Strom 1975; Strom, Strom and Grasdalen 1975). Together these papers paint a picture of enormously obscured protostars, emitting as IR objects around which the veil of dust is occasionally rent allowing a beam of radiat ion to escape and be scattered thus permitting us "by an uncharacteristic kindness on nature's part ••• to observe a very early phase of stellar evolution".
C1u U- , :. cf? u.. S _ ( 124) with the solution 1: A/t There are obviously no growing solutions for s1' The physical reason is as follows. If the disk were to move ahead of its zero-order location, it would become more massive. But the increased force due to gravity is more than compensated for by the additional momentum flux from the fountain, which occurs when the downward speed of the sheet is increased. The next problem involves the stability of the sheet, allowing for departures from a plane-parallel flow.
The X-ray temperatures are in the range 4 x 10 7 °K (Davison et al. 4 x 10 7 0K (Pravdo and Smith 1979). These figures imply a blast wave velocity of only about 2000 km s-l. 80). In this, and an earlier paper (Chevalier and Raymond 1978), a convincing theory capable of explaining the peculiarities of these SNR was proposed. According to this, a collisionless shock propagates into a neutral medium at very high velocity. Initially hydrogen atoms, essentially at rest in this medium, are collisionally excited by the hot electron gas giving rise to the Balmer spectrum.
Investigating the Universe: Papers presented to Zdeněk Kopal on the occasion of his retirement, September 1981 by F. D. Kahn (auth.), F. D. Kahn (eds.)