Chapter 27 Stars and Galaxies
... 6000 can be seen with the unaided eye Over a trillion stars can be seen with the Hubble Space Telescope Apparent Magnitude: brightness as it appears from Earth Absolute Magnitude: brightness as it appears 32.6 ly away ...
... 6000 can be seen with the unaided eye Over a trillion stars can be seen with the Hubble Space Telescope Apparent Magnitude: brightness as it appears from Earth Absolute Magnitude: brightness as it appears 32.6 ly away ...
Lecture 7 Stars and Galaxies and Nebula, (Oh My!) Feb 18 2003
... Outer layers of gas are blown off from the core of a star. The core often goes on to become a white dwarf. The eject gas is illuminated by the remaining star. This is the fate of most stars, including our own Sun. ...
... Outer layers of gas are blown off from the core of a star. The core often goes on to become a white dwarf. The eject gas is illuminated by the remaining star. This is the fate of most stars, including our own Sun. ...
here - Atomki
... The Virial Theorem The Virial theorem can be obtain by multiplying the hydrostatic equil. Eqn. (2) by the volume (V=4/3 πr3) and integrate over the total mass, M: ∫V dP/dm = - 1/3 ∫(Gm/r) dm = 1/3 Egrav The left hand-side term is related to the internal energy, E int. After some algebra, one obtain ...
... The Virial Theorem The Virial theorem can be obtain by multiplying the hydrostatic equil. Eqn. (2) by the volume (V=4/3 πr3) and integrate over the total mass, M: ∫V dP/dm = - 1/3 ∫(Gm/r) dm = 1/3 Egrav The left hand-side term is related to the internal energy, E int. After some algebra, one obtain ...
Hertzsprung-Russell Diagram
... A star has a high luminosity (100 solar luminosities) and a surface temperature of 3500 K. What type of star is it? ...
... A star has a high luminosity (100 solar luminosities) and a surface temperature of 3500 K. What type of star is it? ...
Astr 40 Final Exam Review ()
... 47. A black hole is best defined as any object which is smaller than its event horizon. 48. Isolated black holes slowly evaporate because they slowly leak mass via virtual particles that form near the event horizon. 49. When compared to visual, spectroscopic, or eclipsing binaries, optical doubles a ...
... 47. A black hole is best defined as any object which is smaller than its event horizon. 48. Isolated black holes slowly evaporate because they slowly leak mass via virtual particles that form near the event horizon. 49. When compared to visual, spectroscopic, or eclipsing binaries, optical doubles a ...
What We Know About Stars So Far
... scale of brightness to classify stars. The star’s brightness was dependent on how close it is to the Earth. The closer a star is to the Earth, the brighter it would ...
... scale of brightness to classify stars. The star’s brightness was dependent on how close it is to the Earth. The closer a star is to the Earth, the brighter it would ...
Futuro da Ci^encia no IAG
... observed but should be detected in 2 ways: -High mass stars explode as supernovae and produce a GRBs (z ~ 15 ?) GRB at z~8.2 = pop. III? -First generations of low mass stars should be still evolving, identified by a very low metallicity (or no metals) (z ~ 5 to 15) ...
... observed but should be detected in 2 ways: -High mass stars explode as supernovae and produce a GRBs (z ~ 15 ?) GRB at z~8.2 = pop. III? -First generations of low mass stars should be still evolving, identified by a very low metallicity (or no metals) (z ~ 5 to 15) ...
Last Year`s Exam, Section B
... hence each question should take ~12 minutes to answer do not let yourself get bogged down, but do not write 2 sentences for 5 marks! ...
... hence each question should take ~12 minutes to answer do not let yourself get bogged down, but do not write 2 sentences for 5 marks! ...
The Life Cycle of a star
... • A supernova can light up the sky for weeks. • The temperature in one can reach 1,000,000,000 °C. • The supernova then either becomes a neutron star or a black hole. ...
... • A supernova can light up the sky for weeks. • The temperature in one can reach 1,000,000,000 °C. • The supernova then either becomes a neutron star or a black hole. ...
Astronomical terms and constants
... where σ = 5.67 × 10−5 erg s−1 cm−2 deg−4 is the Stefan-Boltzman constant. The flux of energy is measured in [erg s−1 cm−2 ], A star with a radius R and luminosity L has an “effective” temperature Teff defined with the relation: L = 4πR2 σT4eff . The sun has Teff,⊙ = 5.8 × 103 K . The coolest hydroge ...
... where σ = 5.67 × 10−5 erg s−1 cm−2 deg−4 is the Stefan-Boltzman constant. The flux of energy is measured in [erg s−1 cm−2 ], A star with a radius R and luminosity L has an “effective” temperature Teff defined with the relation: L = 4πR2 σT4eff . The sun has Teff,⊙ = 5.8 × 103 K . The coolest hydroge ...
Integrative Studies 410 Our Place in the Universe
... • Commitment: Do this over several, not necessarily consecutive days, at exactly the same time. • Weather: Need to see the shadow for a minute, so can do on partly cloudy, possibly hazy but not overcast days. ...
... • Commitment: Do this over several, not necessarily consecutive days, at exactly the same time. • Weather: Need to see the shadow for a minute, so can do on partly cloudy, possibly hazy but not overcast days. ...
Astronomy Campus Assessment
... Scientists measure the movement of distant galaxies to learn more about the origin of the universe. You researched scientific data that showed that light from a distant galaxy is red-shifted. How would you evaluate the data? A. It indicates that the expansion of the universe has stopped, and so it d ...
... Scientists measure the movement of distant galaxies to learn more about the origin of the universe. You researched scientific data that showed that light from a distant galaxy is red-shifted. How would you evaluate the data? A. It indicates that the expansion of the universe has stopped, and so it d ...
neutron star - Livonia Public Schools
... Types of Galaxies Irregular Galaxies • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young s ...
... Types of Galaxies Irregular Galaxies • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young s ...
The life of Stars
... • Eclipsing binaries (stars do not change physically, only their relative position changes) • Nova (two stars “collaborating” to produce “star eruption”) • Cepheids (stars do change physically) • RR Lyrae Stars (stars do change physically) • Mira Stars (stars do change physically) ...
... • Eclipsing binaries (stars do not change physically, only their relative position changes) • Nova (two stars “collaborating” to produce “star eruption”) • Cepheids (stars do change physically) • RR Lyrae Stars (stars do change physically) • Mira Stars (stars do change physically) ...
Slide 1
... Before October 6, 1923, astronomers thought the Andromeda Nebula and similar objects were bright pockets of matter inside the Milky Way. On that day astronomer Edwin Hubble noticed, looking at the photograps, a particular type of star inside the Andromeda Nebula. Hubble realized that the star (Ceph ...
... Before October 6, 1923, astronomers thought the Andromeda Nebula and similar objects were bright pockets of matter inside the Milky Way. On that day astronomer Edwin Hubble noticed, looking at the photograps, a particular type of star inside the Andromeda Nebula. Hubble realized that the star (Ceph ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.