• 2 Pages Solutions01
    Solutions01

    School: Georgia Tech

    HOMEWORK 1 Astronomy & Astrophysics Chapter 8 11a. How much more energy is emitted by a star at 20,000 K than one at 5,000 K? (Assume the sizes are similar.) E = 4 R2 T4 E1 / E2 = (T1 / T2)4 = (20,000 / 5,000)4 = (4)4 = 256 X 11b. What is the predominate

  • 4 Pages Solutions02
    Solutions02

    School: Georgia Tech

    HOMEWORK 2 Astronomy & Astrophysics Chapter 8 7. By applying the Boltzmann equation to the neutral hydrogen atom (neglect ionization), write the equation for the population of the nth energy level relative to that of the ground state at temperature T. Now

  • 2 Pages Syllabus07
    Syllabus07

    School: Georgia Tech

    STELLAR ASTROPHYSICS Physics 3021 Fall 2007 Time: Instructor: Office: Email: Web Page: Text: 2 MWF J. R. Sowell W102 Physics Building jim.sowell@physics.gatech.edu http:/capella.physics.gatech.edu Introductory Astronomy & Astrophysics (4th ed), by Z

  • 2 Pages Syllabus08
    Syllabus08

    School: Georgia Tech

    STELLAR ASTROPHYSICS Physics 3021 Fall 2008 Time: Instructor: Office: Email: Web Page: Text: 2 MWF J. R. Sowell W102 Physics Building jim.sowell@physics.gatech.edu http:/www.astronomy.gatech.edu Introductory Astronomy & Astrophysics (4th ed), by Zei

  • 2 Pages Homework06
    Homework06

    School: Georgia Tech

    HOMEWORK 6 Astronomy & Astrophysics Chapter 11 Due Monday, September 22, 2008 1. Astronomers living on Mars would define their astronomical unit in terms of the orbit of Mars. If they defined parsec in the same manner as we do, how many Martian as

  • 1 Page Homework04
    Homework04

    School: Georgia Tech

    HOMEWORK 4 Astronomy & Astrophysics Chapter 8 Due Monday, September 8, 2008 The two solar absorption lines given in the table below are produced when an electron makes an upward transition from the ground state orbital of the neutral Na I atom. ()

  • 2 Pages Star_Model_Description08
    Star_Model_Description08

    School: Georgia Tech

    STELLAR MODEL PROJECT Physics 3021 Fall 2008 Due Monday, November 24 at 2:00pm This project is to make a theoretical stellar model for a given stellar mass with the computer code STATSTAR. You are to calculate a homogenous, main-sequence model havin

  • 1 Page Homework09
    Homework09

    School: Georgia Tech

    HOMEWORK SET 9 Astronomy & Astrophysics Chapter 10 Due Monday, October 6, 2008 2. Compute the thermal Doppler width of the hydrogen line (H) at 486.1 nm formed in the Suns photosphere (T = 5800 K). 7. How would you unambiguously assign a sunspot

  • 0 Pages Solutions03
    Solutions03

    School: Georgia Tech

  • 1 Page Solutions04
    Solutions04

    School: Georgia Tech

    HOMEWORK 4 Astronomy & Astrophysics Chapter 8 The two solar absorption lines given in the table below are produced when an electron makes an upward transition from the ground state orbital of the neutral Na I atom. () 3302.98 5895.94 W () 0.067 0.560 f 0.

  • 1 Page Schedule08
    Schedule08

    School: Georgia Tech

    STELLAR ASTROPHYSICS Physics 3021 - Fall 2008 Day M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F M W F Date Aug Aug Aug Aug Aug Aug Sep Sep Sep Sep Sep Sep Sep Sep Sep Sep Sep Sep Sep Oct Oct Oct Oct Oct Oct

  • 4 Pages Solutions11
    Solutions11

    School: Georgia Tech

    HOMEWORK 11 Astronomy & Astrophysics Due Monday, November 3, 2008 1. Verify that gravitational contraction will only power the Sun for about 10 million years. (Assume a constant luminosity.) E = (-3/10) G M2 / R E = (-0.3) (6.673 x 10 dyne cm /g ) (1

  • 35 Pages Pulsars
    Pulsars

    School: Georgia Tech

    Pulsars and Neutron Stars History The neutron was discovered in 1932. In 1933 a prediction (largely ignored) was that supernovae could form neutron stars. First one was discovered 1967 by Jocelyn Bell; period was 1.3373 seconds. Three more pulsars w

  • 35 Pages Fusion_higher
    Fusion_higher

    School: Georgia Tech

    Higher-Mass Nuclear Fusion Binding Energy Binding Energy is the energy released due to an accompanying loss in mass when nucleons are combined into atomic nuclei (i.e., fusion). Helium Burning The heart of the reaction by which 3 4He 12C + is the

  • 66 Pages Milky_Way
    Milky_Way

    School: Georgia Tech

    The Milky Way The Milky Way The Milky Way is a continuous band of diffuse light. The band is thicker and brighter in one part of the sky and 180o away it is thinner and fainter. The band is tilted about 60o with respect to the Celestial Equator. Tel

  • 31 Pages Red_Giants
    Red_Giants

    School: Georgia Tech

    Red Giants Binding Energy Binding Energy is the energy released due to an accompanying loss in mass when nucleons are combined into atomic nuclei (i.e., fusion). Helium Burning The main line of nucleosynthesis during He burning is found to consist

  • 28 Pages The_Sun
    The_Sun

    School: Georgia Tech

    The Sun Basic Solar Data 100 times larger than the Earth One million times as massive as Earth Surface Temperature ~10,500 F (5,800 K) Rotates once per month Is half a degree in size on the sky Basic Solar Data Solar Atmosphere Photosphere (Light

  • 17 Pages Brown_Dwarfs
    Brown_Dwarfs

    School: Georgia Tech

    Brown Dwarfs Very-Low-Mass Stars What is the smallest amount of material that can form a star? Calculations suggest it is 7 times the mass of Jupiter. Brown dwarfs might be 7 - 100 times the mass of Jupiter. Stars powered by fusion are 100 - 50000 t

  • 23 Pages Post-AGB_Stars
    Post-AGB_Stars

    School: Georgia Tech

    Evolution Beyond the Red Giants Pressure vs Gravity The evolution of a star is shaped by the balance of pressure and gravity. When these two forces are in balance, a star is stable. As a star consumes its supply of hydrogen and evolves away from the

  • 1 Page Homework05
    Homework05

    School: Georgia Tech

    HOMEWORK 5 Astronomy & Astrophysics Chapter 9 Due Wednesday, September 10, 2008 1. Compare the resolution and the light-gathering power of the human eye with those of a a) 10-cm telescope b) 4-m telescope The maximum possible antenna separation of t

  • 58 Pages Fusion2
    Fusion2

    School: Georgia Tech

    Nuclear Fusion Nuclear Physics Key Words: element, isotope, nucleon Number of nucleons = A = Z + N where Z is the number of protons N is the number of neutrons 1 u = 1/12 C12 1 u = 1.660540 x 10-24 g = 931.5 MeV/c2 Particle Masses Particle Proton N

  • 36 Pages Line_Broadening
    Line_Broadening

    School: Georgia Tech

    Spectral Line Shapes Spectral Line Shapes The shape of an spectral line contains a wealth of information about the environment in which it was formed. The figure shows a graph of the radiant flux, F, as a function of wavelength for a typical absorpt

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