Ch21 - Assignment Chapter 21 Class Astronomy I Date...

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Assignment: Chapter 21 Class: Astronomy I Date: November 7 th , 2007 Review Questions 1. A neutron star is an incredibly dense sphere composed primarily of neutrons. A drawing in an eleventh-century structure in New Mexico suggested this existence of such star. 2. Degenerate neutron pressure could support a stellar corpse-perhaps one even more massive than a white dwarf, because degenerate neutron pressure can be much stronger than degenerate electron pressure. So, while a white dwarf collapses if its mass is above the Chandrasekhar limit, a neutron star might not. 3. Pulsars were discovered when Jocelyn Bell noticed that the antennas had detected regular pulses of radio noise from particular location in the sky. 4. Astronomers ruled out that pulsars were rapidly rotating white dwarf stars because a white dwarf that rotated on its axis in just 1 second would be on the verge of flying apart. 5. Since neutron stars are very small, they should also rotate rapidly. The small size of neutron stars also implies that they have intense magnetic fields. 6. The periods were extremely regular, ranging from about 0.25 second for the fastest to about 1.5 seconds for the slowest. The possibility had to be discarded within a few months after several more of these pulsating radio sources. 7. Neutron stars are very small, they should rotate rapidly. And their small sizes also imply that they have intense magnetic fields. 8.
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This note was uploaded on 08/25/2008 for the course ASTRON 1 taught by Professor Jsepikas during the Winter '07 term at Pasadena City College.

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Ch21 - Assignment Chapter 21 Class Astronomy I Date...

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