1935-01-19 — Page 7

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(Continued from Page 0.)· occurs with great suddenness and rapidity. With a few exceptions it has been found to occupy less than three days, and 'during this short space of time the star's Bight may be augmented anything up to 100,000-fold. But on reaching its maximum this brightness begins almost immediately to fall.

The fading Ja, however, al much slower rate than the rise, and ls apt to be very irregular. Several years generally clapse be fore the star returns to its original faint condition.

An examination of the spectra of various nova has shown that rapid and remarkable changes are cou. stantly taking place during the out- burst, especially in its early stages, and this is why the astronomers are so keen to lose no time in obtaining spectroscopic photo- graphs, and are prepared to put aside most of their other work in order to do so,

The star discovered by Mr. Prentice has aince been found on a photograph taken nearly thirty years ago. It appears on the plate na.a very minute object, with no peculiarities to distinguish it from its millions of faint neighbours.

Many other nove have been identified in this way after their outbursts, and information is thus obtained as to the amount by which the light has Increased. In the present case it is over 100,000 times, and the star is likely to re- mala visible to the naked eye for several days, and with binoculars for some weeks.

When a nova is on the rise it is always pure white in colour. A few days after its maximum, how- ever, it begins to display a strongly. reddish tint. Within a few weeks this redness dies out, and the star, now growing faint, often appears alightly greenlah in colour. Final- ly, when approaching its original lustre, it becomes white again, and sa remains.

WHAT IS HAPPENING

The two-fold question naturally- arinca: (1) What is happening to produce such remarkable effects; and (2) what caused it to happen?

The first part of the question was answered many years ago by the late Professor Bickerton,

who pointed out that the sudden rise in brightness, coupled with the charnc- ter of the spectrum, indicated a vio lent explosion which projected con- centric shells of hydrogen and other gases in all directions from the centre of disturbance. This view is now generally adopted by astronomers, but the same cannot be anid of Bickerton's answer to the second part of the question.

He supposed that the explosion took place in a new body, formed by the grazing impact of two pre- viously existing and possibly

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"dead" stars. It is now consider- ed, however, that in view of the probable number and distribution of the stars in space auch an event would bo of exceedingly rore occurrence; whereas if we include the comparatively large number of fainter nova recently revealed by serious physical objections to this tain, but the occurrence has boon be quite suficient to cause the ex- photography the phonomenon Is Idea, and it svoma, on the whole, put down to the development plosion observed. much too commos to admit of such most probable that a nova re of an unstable condition in the'

UNPLEASANT DOUBT an explanation.

presents a purely spontaneous ex- Interior of a relatively old and com- plosion occurring in a atar with-pact star. From this cause à rapid It is thought that this may Other astronomers have suggest-out the intervention of any outside collapse of Its substance towards possibly happen to every star at a ed that the passage of a star body.

its contre might occur at any mo- jcertain atage of its career, and this through a nebula might account for Why a star should explode sud-ment, and the sudden increase of naturally leads, us to wonder the observed facts; but there are denly. In this way is not quite cer- pressure resulting from this would (Continued on Page 10.)

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