Brown et al. 2008 Studying Resolved Stellar
... Being the oldest known stellar aggregates, accurately age-dating globular clusters can potentially answer two additional intriguing questions: a) did they form before or after cosmic re-ionization, and in case what part did they play in it? And, b) otherwise, did they form at the time of the formati ...
... Being the oldest known stellar aggregates, accurately age-dating globular clusters can potentially answer two additional intriguing questions: a) did they form before or after cosmic re-ionization, and in case what part did they play in it? And, b) otherwise, did they form at the time of the formati ...
The Death of Stars - Mounds Park Academy Blogs
... • Pictures taken of this nebula over the years prove that the cloud is still expanding. ...
... • Pictures taken of this nebula over the years prove that the cloud is still expanding. ...
Lesson 120125 - WordPress.com
... are elliptical 2. Each orbit sweeps equal areas in equal times 3. The square of the orbital period is proportional to the cube of the mean distance from the Sun ...
... are elliptical 2. Each orbit sweeps equal areas in equal times 3. The square of the orbital period is proportional to the cube of the mean distance from the Sun ...
Stars - Academic Computer Center
... mass. • More massive stars are more luminous, they release energy at a higher rate and are located towards the upper left of the Main Sequence. (They also consume Hydrogen ...
... mass. • More massive stars are more luminous, they release energy at a higher rate and are located towards the upper left of the Main Sequence. (They also consume Hydrogen ...
Lecture 24
... occurring MASER emission Radio telescopes can measure position & velocity of MASERs to great accuracy. Velocity changes with radius precisely as expected if all mass is concentrated at center! 30 million solar mass black hole ...
... occurring MASER emission Radio telescopes can measure position & velocity of MASERs to great accuracy. Velocity changes with radius precisely as expected if all mass is concentrated at center! 30 million solar mass black hole ...
Evolved Stellar Populations
... stars allows to estimate variations in meanage and metallicity across stellar populations. Modest but complete samples produce ...
... stars allows to estimate variations in meanage and metallicity across stellar populations. Modest but complete samples produce ...
The influence of chemical composition on the pulsation properties of
... three parameters [the third being (B-V)]...” The PLC applies individually to each star No need for statistically significant samples to adequately populate the instability strip as in the case of the PL PLCs tend to be less sensitive to extinction than PLs: the color coefficients happend to tend to ...
... three parameters [the third being (B-V)]...” The PLC applies individually to each star No need for statistically significant samples to adequately populate the instability strip as in the case of the PL PLCs tend to be less sensitive to extinction than PLs: the color coefficients happend to tend to ...
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... • The bulge: the original, self-enriched stellar population that formed at the bottom of the galaxy’s potential well • The bar: formed from the disk material due to a dynamical instability, that funnels out the gas, and ceases the star formation • The stellar halo: debris from the tidal disruptio ...
... • The bulge: the original, self-enriched stellar population that formed at the bottom of the galaxy’s potential well • The bar: formed from the disk material due to a dynamical instability, that funnels out the gas, and ceases the star formation • The stellar halo: debris from the tidal disruptio ...
Dark matter in the Galactic Halo Rotation curve (i.e. the orbital
... there is too much dark matter for it all to be baryons, must be largely non-baryonic. On galaxy scales no such simple argument exists. Individual types of dark matter can be constrained using various indirect arguments, but only direct probe is via gravitational lensing. ...
... there is too much dark matter for it all to be baryons, must be largely non-baryonic. On galaxy scales no such simple argument exists. Individual types of dark matter can be constrained using various indirect arguments, but only direct probe is via gravitational lensing. ...
Sirius Astronomer - Orange County Astronomers
... Proxima Centauri, the nearest star to our Sun, is predicted to cross in front of 2 distant stars, one in October 2014 and the other in February 2016. Gravitational micro lensing of the background stars will allow the mass of Proxima to be calculated. It should also be possible to determine if any pl ...
... Proxima Centauri, the nearest star to our Sun, is predicted to cross in front of 2 distant stars, one in October 2014 and the other in February 2016. Gravitational micro lensing of the background stars will allow the mass of Proxima to be calculated. It should also be possible to determine if any pl ...
Lecture 20, PPT version
... • if universe has been expanding at constant rate for all time, then all galaxies would have been on top of each other at time equal to 1/H0 Distance between any two galaxy clusters at the present day: distance = speed x time (the standard formula) speed = H0 x distance (Hubble’s Law, specifically) ...
... • if universe has been expanding at constant rate for all time, then all galaxies would have been on top of each other at time equal to 1/H0 Distance between any two galaxy clusters at the present day: distance = speed x time (the standard formula) speed = H0 x distance (Hubble’s Law, specifically) ...
JeopardyCh21StarsGalaxiesUniverse
... Capture the Chapter for 200 Which of the following is not a part of the electromagnetic spectrum? radio waves, sound waves, x-rays ...
... Capture the Chapter for 200 Which of the following is not a part of the electromagnetic spectrum? radio waves, sound waves, x-rays ...
Chapter 21 Jeopardy
... Capture the Chapter for 200 Which of the following is not a part of the electromagnetic spectrum? radio waves, sound waves, x-rays ...
... Capture the Chapter for 200 Which of the following is not a part of the electromagnetic spectrum? radio waves, sound waves, x-rays ...
Homework 6
... The first choice, the white dwarf, is much to small to be visible in a nearby galaxy, let alone a distant galaxy. The second, the Cepheid variable, is a standard candle, but only works for nearby galaxies. White dwarf supernovas are extremely bright and their luminosity is almost always the same (it ...
... The first choice, the white dwarf, is much to small to be visible in a nearby galaxy, let alone a distant galaxy. The second, the Cepheid variable, is a standard candle, but only works for nearby galaxies. White dwarf supernovas are extremely bright and their luminosity is almost always the same (it ...
Gravity - SFA Physics and Astronomy
... The force of gravity cannot be made zero. Mass causes gravity •Only one kind of mass •Contrast with the electric force G is small •6.67 X 10-11 N m2/kg2 ...
... The force of gravity cannot be made zero. Mass causes gravity •Only one kind of mass •Contrast with the electric force G is small •6.67 X 10-11 N m2/kg2 ...
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: ...
Galaxies - senwiki
... that nothing, not even light, can escape. -Why? Black holes have extremely strong gravitational pulls. They can pull in stars and accumulate the mass of the stars. -Where are black holes located? Astronomers believe that each galaxy contains at least one supermassive black hole at its centre. ...
... that nothing, not even light, can escape. -Why? Black holes have extremely strong gravitational pulls. They can pull in stars and accumulate the mass of the stars. -Where are black holes located? Astronomers believe that each galaxy contains at least one supermassive black hole at its centre. ...
What is a Hertzsprung
... • Any star that varies significantly in brightness with time is called a variable star • Some stars vary in brightness because they cannot achieve proper balance between power welling up from the core and power radiated from the surface • Such a star alternately expands and contracts, varying in bri ...
... • Any star that varies significantly in brightness with time is called a variable star • Some stars vary in brightness because they cannot achieve proper balance between power welling up from the core and power radiated from the surface • Such a star alternately expands and contracts, varying in bri ...
`Daniel` – The Colonization of Tiamat
... Intervention Theory by the late Lloyd Pye,3 speculating that our world has not only been visited by other species and civilizations, but it was actually commonplace—and they appear to have lacked Star Trek’s “prime directive” of non-interference—they got their fingers in everything. The primary obje ...
... Intervention Theory by the late Lloyd Pye,3 speculating that our world has not only been visited by other species and civilizations, but it was actually commonplace—and they appear to have lacked Star Trek’s “prime directive” of non-interference—they got their fingers in everything. The primary obje ...
Introduction to Astronomy and the Celestial Sphere
... appears as a dome over our heads. Stars seem embedded like tiny jewels Ancient astronomers believed that all of the stars were the same distance from the earth (but, of course, they aren’t). Useful model of what we see from Earth. At any one time, we can see only ½ of the celestial sphere (Where is ...
... appears as a dome over our heads. Stars seem embedded like tiny jewels Ancient astronomers believed that all of the stars were the same distance from the earth (but, of course, they aren’t). Useful model of what we see from Earth. At any one time, we can see only ½ of the celestial sphere (Where is ...
Multiple Choice, continued Stars, Galaxies, and the Universe
... Today, we know that Copernicus was right: the stars are very far from Earth. In fact, stars are so distant that a new unit of length—the light-year—was created to measure their distance. A light-year is a unit of length equal to the distance that light travels through space in 1 year. Because the sp ...
... Today, we know that Copernicus was right: the stars are very far from Earth. In fact, stars are so distant that a new unit of length—the light-year—was created to measure their distance. A light-year is a unit of length equal to the distance that light travels through space in 1 year. Because the sp ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.