The chandrasekhar limit - Study guides, Class notes & Summaries

White dwarfs: properties - Remaining cores of dead, low mass stars Electron degeneracy pressure supports them against gravity Slowly fade with time Sirius and its hot WD companion White dwarfs with same mass as Sun are about same size as Earth; slowly cooling Typical density 10^6 gram / cubic cm Higher mass white dwarfs are smaller Cannot be more massive than 1.4MSun, the Chandrasekhar limit WDs in binaries: nova, supernova Type I - Mass falls toward white dwarf from binary companion ...

about 91% (by number) of the atoms in the sun are the element - ️️hydrogen Age of the Universe - ️️13.7 billion years all the energy of the sun is generated in the - ️️core alpha particle - ️️A cluster of 2 protons and 2 neutrons emitted from a nucleus in one type of radioactivity an astronomer discovers a new star and wants to measure its temperate. she could do this by: - ️️take a spectrum of the star and determine the spectral type Astronomers did star counts in all d...

he 'size' of a black hole is given by the Schwarzchild radius. For the earth this is about 1 cm. This means that: - if the earth were somehow to be shrunk to this size, gravity would win and there would be an inevitable collapse to a 'singularity' at the center In addition to supernovae formed from the collapse of massive stars as they run out of fuel, supernovae of another kind are produced when: - a white dwarf near the 'Chandrasekhar limit' has extra matter dumped onto it from a co...

Synchrotron radiation is produced by - high-velocity electrons moving through a magnetic field A Type la supernova is believed to occur - when a white dwarf exceeds the Chandrasekhar limit The material that accretes onto a neutron star or black hole is expected to emit x-rays because - the material will become hot enough that it will radiate most strongly at x-ray wavelengths. A planetary nebula - produces an emission spectrum. The main sequence has a lower limit because - there is a...

PHSC 102 Final Bushnell MSU 2024 Exam Questions with Correct Answers What triggers might have made part of an interstellar cloud begin to contract? supernova density waves shockwave (all of the above) Which event marks the birth of a star? fusion of hydrogen atoms into helium atoms True or False? Stars form from a collapsing cloud that fragments into smaller and smaller pieces. True Which is characteristic of globular star clusters? tightly bound Most stars, probably all stars, ...

ASTR 1010 Final Vanderbilt; Questions And Answers radioactive decay - answer -the process by which radioactive isotope breaks down into a stable isotope of same/another element; each half-life leaves half of existing population of radioactive isotope star cluster + special properties - answer -gravitationally bound stars formed from the same gas cloud; all about same dstnc from Earth, all about same age; open clusters have countable stars, globular clusters have too many to count (st...

Astronomy Unit 7 Exam - Questions & Answers Accretion is a gradual growth of a body by the accumulation of other, smaller bodies. White dwarf is a star with sufficiently high surface temperature that it glows white. Chandrasekhar limit is the maximum possible mass of a white dwarf. Process of Science: Stars Leaving the Main Sequence Part A: A star is in hydrostatic equilibrium when the outward push of pressure due to core burning is exactly in balance with the inward pull of gravity. When the h...

ECS 1501 ASSIGNMENT 6 QUESTIONS AND 100% CORRECT ANSWERS You would expect millisecond pulsars to be a) most common in open clusters. b) collapsing rapidly. c) part of a binary system. d) rotating slowly. e) isolated in space. - CORRECT ANSWER==c) part of a binary system. An observer on a planet sees a spaceship approaching at 0.5c (where c is the speed of light). A beam of light projected by the ship would be measured by this observer to travel at a) 2.5c. b) c. c) 1.5c. d) 0...

ECS1501 ASSIGNMENT 6 QUESTIONS AND EXPECTED ANSWERS You would expect millisecond pulsars to be a) most common in open clusters. b) collapsing rapidly. c) part of a binary system. d) rotating slowly. e) isolated in space. - CORRECT ANSWER==c) part of a binary system. An observer on a planet sees a spaceship approaching at 0.5c (where c is the speed of light). A beam of light projected by the ship would be measured by this observer to travel at a) 2.5c. b) c. c) 1.5c. d) 0.2...

Part I: Multiple Choice Questions (135 points total). There are 45 multiple choice questions worth 3 points each. Choose the best answer and record it on the scan sheet. 1. If the average density of the Universe were greater than the critical density, the Universe would A. continue to contract forever. B. eventually stop contracting and begin expansion. C. eventually stop expanding and begin contraction. D. continue to expand forever. 2. A Type I supernova occurs when A. a low ...