Building the Hertzsprung
... How hot? How old, and how long do they live? What is their chemical composition? How are they moving? Are they isolated or in clusters? By answering these questions, we not only learn about stars, but about the structure and evolution of galaxies they live in, and the ...
... How hot? How old, and how long do they live? What is their chemical composition? How are they moving? Are they isolated or in clusters? By answering these questions, we not only learn about stars, but about the structure and evolution of galaxies they live in, and the ...
charts_set_9
... Not enough radiating matter at large R to explain rotation curve => "dark" matter! Dark matter must be about 90% of the mass! Composition unknown. Probably mostly exotic particles that hardly interact with ordinary matter at all (except gravity). Small fraction may be brown dwarfs, dead white dwarf ...
... Not enough radiating matter at large R to explain rotation curve => "dark" matter! Dark matter must be about 90% of the mass! Composition unknown. Probably mostly exotic particles that hardly interact with ordinary matter at all (except gravity). Small fraction may be brown dwarfs, dead white dwarf ...
Lecture 10: Stellar Evolution
... The amount of time a star spends in pre-main sequence contraction before it reaches the main sequence depends on its mass. ...
... The amount of time a star spends in pre-main sequence contraction before it reaches the main sequence depends on its mass. ...
Physics 127 Descriptive Astronomy Homework #3 Key (Chapter 2
... 2-2. A cellular phone is actually a radio transmitter and receiver. You receive an incoming call in the form of a wave of frequency 880.65 MHz. What is the wavelength (in meters) of this wave? Using the equation f = c/ found in the second column of p. 38 of the text, we can solve for the wavelength ...
... 2-2. A cellular phone is actually a radio transmitter and receiver. You receive an incoming call in the form of a wave of frequency 880.65 MHz. What is the wavelength (in meters) of this wave? Using the equation f = c/ found in the second column of p. 38 of the text, we can solve for the wavelength ...
Chapters 16,17
... and the halo rotates differentially (objects further from the center take longer to complete an orbit than objects closer to the center). b. The disk rotates differentially (objects further from the center take longer to complete an orbit than objects closer to the center), and the halo rotates diff ...
... and the halo rotates differentially (objects further from the center take longer to complete an orbit than objects closer to the center). b. The disk rotates differentially (objects further from the center take longer to complete an orbit than objects closer to the center), and the halo rotates diff ...
Stellar Lives (continued). Galaxies.
... Both shells contract, driving temperatures higher. The star grows more luminous, but not for a long time (a few million years). ...
... Both shells contract, driving temperatures higher. The star grows more luminous, but not for a long time (a few million years). ...
Variability of Be stars
... ~200 Be stars are currently known among 1660 B-type stars brighter than V=6.5 mag ...
... ~200 Be stars are currently known among 1660 B-type stars brighter than V=6.5 mag ...
Dwarf novae
... In order the support a greater mass, we need more electron degeneracy pressure which requires a greater density ...
... In order the support a greater mass, we need more electron degeneracy pressure which requires a greater density ...
What do we mean by habitable zone?
... put a planet in that star’s habitable zone (which would be farther away because the star would be much more luminous than the Sun), life would be hard-pressed to evolve much even if it managed to originate. As a reminder, the earliest traces of life on Earth go back to something like 800 million ye ...
... put a planet in that star’s habitable zone (which would be farther away because the star would be much more luminous than the Sun), life would be hard-pressed to evolve much even if it managed to originate. As a reminder, the earliest traces of life on Earth go back to something like 800 million ye ...
How Common is Life in the Milky Way?
... Indicate how common you believe intelligent civilizations are in the Milky Way Galaxy: ...
... Indicate how common you believe intelligent civilizations are in the Milky Way Galaxy: ...
Lecture 9: Stellar Spectra
... We can also determine the abundances of many elements in stars by using the “atomic fingerprints” seen in spectral absorption lines. We first determine (1) the star’s temperature (spectral class) (2) the star’s surface density (luminosity class) Once these are known, we can then estimate the abundan ...
... We can also determine the abundances of many elements in stars by using the “atomic fingerprints” seen in spectral absorption lines. We first determine (1) the star’s temperature (spectral class) (2) the star’s surface density (luminosity class) Once these are known, we can then estimate the abundan ...
Sec 29.3 - Highland High School
... nuclear reactions because it is supported by the resistance of electrons being squeezed together. This pressure counteracts gravity and can support the core as long as the mass of the remaining core is less than about 1.4 times the mass of the Sun. ...
... nuclear reactions because it is supported by the resistance of electrons being squeezed together. This pressure counteracts gravity and can support the core as long as the mass of the remaining core is less than about 1.4 times the mass of the Sun. ...
Studies of young stellar objects (25+5)
... weak with time. • With the possibility of recombination line “stacking” we may be able to detect radial ...
... weak with time. • With the possibility of recombination line “stacking” we may be able to detect radial ...
sc_examII_fall_2002 - University of Maryland
... 8. Interstellar dust lying between a star and an observer on Earth will cause the star to appear A. dimmer and redder. B. dimmer and bluer. C. brighter and redder. D. brighter and bluer. E. unaffected due to the wavelength of visible light. 9. Titan, moon of Saturn, is of interest and will be visite ...
... 8. Interstellar dust lying between a star and an observer on Earth will cause the star to appear A. dimmer and redder. B. dimmer and bluer. C. brighter and redder. D. brighter and bluer. E. unaffected due to the wavelength of visible light. 9. Titan, moon of Saturn, is of interest and will be visite ...
Sample Final - IUPUI Physics
... • D) all of the above 31) Quasars are typically found? • A) on the other side of the observable universe (< 4 billion light years) • B) in the cores of the nearest galaxies to us (less than 100 million light years) • C) in the cores of nearby galaxy clusters (200 million to 2 billion light years) • ...
... • D) all of the above 31) Quasars are typically found? • A) on the other side of the observable universe (< 4 billion light years) • B) in the cores of the nearest galaxies to us (less than 100 million light years) • C) in the cores of nearby galaxy clusters (200 million to 2 billion light years) • ...
AST 105: Introduction to the Solar System HOMEWORK # 3
... photon of red light contain more or less energy than a photon of blue light? Red light has a longer wavelength, a smaller frequency, and thus a photon energy which is smaller than blue light. 4. In the movie Contact, Jodi Foster is shown listening on headphones to signals from space. Why is this fan ...
... photon of red light contain more or less energy than a photon of blue light? Red light has a longer wavelength, a smaller frequency, and thus a photon energy which is smaller than blue light. 4. In the movie Contact, Jodi Foster is shown listening on headphones to signals from space. Why is this fan ...
Closed books and notes, 1 hour. Please PRINT
... Simple estimates show that the energy would run out after only a few thousand years The time scale for contraction is about 25 million years - much less than the age of the Earth Rocks on Earth have been dated as billions of years old Contraction of a star does not yield any energy The Sun’s size is ...
... Simple estimates show that the energy would run out after only a few thousand years The time scale for contraction is about 25 million years - much less than the age of the Earth Rocks on Earth have been dated as billions of years old Contraction of a star does not yield any energy The Sun’s size is ...
A105 Stars and Galaxies
... Far more efficient engines are needed Energy requirements are enormous Ordinary interstellar particles become like cosmic rays Social complications of time dilation ...
... Far more efficient engines are needed Energy requirements are enormous Ordinary interstellar particles become like cosmic rays Social complications of time dilation ...
jan0605
... 7. Continued accretion of small satellite galaxies as Milky Way builds its outer halo Total mass ~ few x 1011 solar masses: <1% halo+bulge; 10% disk; ~90% dark matter ...
... 7. Continued accretion of small satellite galaxies as Milky Way builds its outer halo Total mass ~ few x 1011 solar masses: <1% halo+bulge; 10% disk; ~90% dark matter ...
blue_giant
... Most blue giants are found in O-B associations, large collections of loosely bound young stars. Since they are so hot (but not that dense), their life expectancy is very short (in the order of tens or hundreds of million years), and theories predict that most of them will end their lives as supern ...
... Most blue giants are found in O-B associations, large collections of loosely bound young stars. Since they are so hot (but not that dense), their life expectancy is very short (in the order of tens or hundreds of million years), and theories predict that most of them will end their lives as supern ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.