21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 15.3, Problem 15.3CYU
To determine

The origin of required energy for the fusion in a protostars.

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The place on the H–R diagram where contracting protostars first become visible is   a. the horizontal branch.   b. the instability strip.   c. the birth line.   d. the zero-age main sequence.   e. none of the above.
The theory that the collapse of a massive star’s iron core produces neutrinos was supported by   a. the size and structure of the Crab nebula.   b. laboratory measurements of the mass of the neutrino.   c. the brightening of supernovae a few days after they are first visible.   d. underground counts from solar neutrinos.   e. the detection of neutrinos from the supernova of 1987.
As a white dwarf cools, its radius will not change because   a. pressure resulting from nuclear reactions in a shell just below the surface keeps it from collapsing.   b. pressure does not depend on temperature for a white dwarf because the electrons are degenerate.   c. pressure does not depend on temperature because the white dwarf is too hot.   d. pressure does not depend on temperature because the star has exhausted all its nuclear fuels.   e. material accreting onto it from a companion maintains a constant radius.
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