Do stars of all masses acquire most of their mass via gravitational collapse of a single dense core?
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- Do stars of all masses acquire most of their mass via gravitational collapse of a single dense core?
- How are the properties of a star or binary determined by the properties of the medium from which it forms?
- How does the gas that goes into a protostar lose its magnetic flux and
angular momentum ? - How do massive stars form in the face of intense radiation pressure?
- What are the properties of the protostellar disks, jets, and outflows associated with young stellar objects (YSOs), and what governs their dynamical evolution?
- The macrophysics of star formation deals with the formation of systems of stars, ranging from clusters to galaxies.
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- Describe how energy generated in the core of a 1-solar-mass star gets to the star's surface.A red giant that was originally a 9.5MSun main-sequence star loses a solar mass in 100,000 years via a superwind. What is this mass loss rate in units of solar masses per year? (the answer is not 0.000095 solar masses per year). Additionally, at this mass loss rate, what will the red giant's mass be after 0.5 million years? (Enter your answer as a multiple of MSun.)Cluster Sizes. An open cluster is a collection of 10 to 1000 stars in a region about 25 pc in diameter. About how far apart are the stars in an open cluster in units of pc? (Hints: What share of the cluster's volume belongs to a single 4 Tr. Use the cited value for the maximum number of stars in your calculation.) star? The volume of a sphere is pc.
- A supernova’s energy is often compared to the total energy output of the Sun over its lifetime. Using the Sun’s current luminosity, calculate the total solar energy output, assuming a 1010 year main-sequence lifetime. Using Einstein’s formula E=mc2 calculate the equivalent amount of mass, expressed in Earth masses. [Hint: The total energy output of the Sun over its lifetime is given by its current luminosity times the number of seconds in a year times its ten billion-year lifetime; ; mass of earth = 6×1024kg; c = 3×108m/s. Your answer should be 200-300 Earth masses.]How often can a star go supernova? Group of answer choices Many times, depending on the size of its companion star. Twice, the first time when it runs out hydrogen, and the second time when it runs out of iron. Once, early in its evolution. Once, late in its evolution. At various times, depending on the composition of the star.What is the escape velocity (in km/s) from the surface of a 1.1 M neutron star? From a 3.0 M neutron star?
- How many years? Thank you!What are the main products of the fusion reactions that take place in low mass main sequence stars?The evolutionary track of a medium mass star is shown below. Which cut-away core diagram correctly illustrates the source of fusion energy when the star is at the indicated position? (A) H>He (B) He>C (C) (D) H>He H>He He>C Не Temperature А. (А) В. (В) C. (C) D.(D) Luminosity -