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PHYS 1010 Study Guide - Final Guide: Drake Equation, Cygnus X-1, Distant Star

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brownhound447
11 Apr 2015
School
University of Windsor
Department
Physics
Course
PHYS 1010
Professor
Mark Lubrick

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Document Summary

1. in our location in the milky way, the galactic disk is only about ________ ly thick. An f giant with a period of 14 hours. 3. the radio source _______ is located in a place consistent with the center of our galaxy. The bright blue stars that dominate the sky are population i stars. 8. from the sun, the distance to the galactic center is about. Population ii giants like orange arcturus: galactic disks appear blue because. A k giant with a period of 14 days: a method for identifying a black hole is to look for its effects on a nearby companion, most of the mass of our galaxylies. The mass of the visible star is greater than that of the x-ray source. 15. between us and the galactic center, the milk way has a mass of. In the disc and about one-half a galactic radius from eh center. 17. the rr lyrae stars all have periods of.

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Related Questions

Studies of the relationship of the Sun to our galaxy—the Milky Way—have revealed that the Sun is located near the outer edge of the galactic disc, about 30000 lightyears () from the center. The Sun has an orbital speed of approximately 250 km/s around the galactic center.

(a) What is the period of the Sun’s galactic motion?

(b) What is the order of magnitude of the mass of the Milky Way galaxy?

(c) Suppose the galaxy is made mostly of stars of which the Sun is typical. What is the order of magnitude of the number of Starts in the Milky Way?

An extrasolar planet can be detected by observing the wobbleit produces on the star around which it revolves. Suppose anextrasolar planet of mass mb revolves around its star of mass ma .If no external force acts on this simple two-object system, thenits CM is stationary. Assume ma and mb are in circular orbits withradii ra and rb about the system's CM.
(a) Show that ra =(mb/ma)rb
(b) Now consider a Sun-like star and a single planet with thesame characteristics as Jupiter. That is, mb = (1.0 x 10-3)ma andthe planet has an orbital radius of 8.0 x 1011 meters. Determinethe radius ra of the star's orbit about the system's CM.
(c) When viewed from Earth, the distant system appears towobble over a distance of 2ra . If astronomers are able to detectangular displacements ? of about 1 milliarcsec (1 arcsec = 1/3600of a degree), from what distance d (in light years) canthe star's wobble be detected (1 ly = 9.46 x 1015 m)?
(d) That star nearest to our Sun is about 4 ly away. Assumingstars are uniformly distributed throughout our region of the MilkyWay Galaxy, about how many stars can this technique be applied toin the search for extrasolar planetary systems?

Astronomers have observed a small, massive object at the centerof our Milky Way galaxy. A ring of material orbits this massiveobject; the ring has a diameter of about 15 light years and anorbital speed of about 200 km/s.
A) Determine the mass of the massive object at the center of theMilky Way galaxy.
Take the distance of one light year to be 9.461×1015m. Iwas able to get this it is 4.26×1037kg.
B) Express your answer in solar masses instead of kilograms, whereone solar mass is equal to the mass of the sun, which is1.99×1030. I got this to it is 2.14×107 solarmasses
C)Observations of stars, as well as theories of the structure ofstars, suggest that it is impossible for a single star to have amass of more than about 50 solar masses. Can this massive object bea single, ordinary star? I got this it is no.
D) Many astronomers believe that the massive object at the centerof the Milky Way galaxy is a black hole. If so, what is itsSchwarzschild radius? Express your answer in meters.
E)Would a black hole of this size fit inside the earth's orbitaround the sun? The mean distance from the sun to the earth is1.5×1011m.
Please solve part D and E. For part D please show equations andsolve all the way through. I worked it twice and I am getting myanswer wrong. I am afraid I am making a silly mistake.