AST 207 7 Homew
... gure 1 Hertzsprrung-Russell ddiagram of the sstar cluster M115. B-V is a meeasure of color.. The vertical sscale on the lefft is apparent m magnitude, and the scaale on the rightt is absolute maagnitude. ...
... gure 1 Hertzsprrung-Russell ddiagram of the sstar cluster M115. B-V is a meeasure of color.. The vertical sscale on the lefft is apparent m magnitude, and the scaale on the rightt is absolute maagnitude. ...
v1 - ESO
... populations, suggest that they are predominantly very old systems. However, the main theory of galaxy formation predicts that they assembled their mass relatively recently, and should therefore be dynamically young. It is important to accurately quantify this apparent contradiction. The only way to ...
... populations, suggest that they are predominantly very old systems. However, the main theory of galaxy formation predicts that they assembled their mass relatively recently, and should therefore be dynamically young. It is important to accurately quantify this apparent contradiction. The only way to ...
Stars: Their Life and Afterlife
... Superbubbles are large cavities of hot, low-density plasma that are created by the collective effects of a large number of massive stars. We saw earlier in the lecture series that stars tend to form in clusters as a giant molecular cloud contracts. This means that they not only tend to form close to ...
... Superbubbles are large cavities of hot, low-density plasma that are created by the collective effects of a large number of massive stars. We saw earlier in the lecture series that stars tend to form in clusters as a giant molecular cloud contracts. This means that they not only tend to form close to ...
Age Estimates of Globular Clusters in the Milky Way
... ing the distance to a globular (33) showing the location of the principal stellar evolutionary sequences. RR Lyrae stars in the field and cluster. The dynamical distance This diagram plots the visible luminosity of the star (measured in magni- those in globular clusters. Howestimate compares the rel ...
... ing the distance to a globular (33) showing the location of the principal stellar evolutionary sequences. RR Lyrae stars in the field and cluster. The dynamical distance This diagram plots the visible luminosity of the star (measured in magni- those in globular clusters. Howestimate compares the rel ...
γ The Potential for Intensity Interferometry with –
... Intensity interferometry exploits a quantum optical effect in order to measure objects with extremely small angular scales. The first experiment to use this technique was the Narrabri intensity interferometer, which was successfully used in the 1970s to measure 32 stellar diameters at optical wavele ...
... Intensity interferometry exploits a quantum optical effect in order to measure objects with extremely small angular scales. The first experiment to use this technique was the Narrabri intensity interferometer, which was successfully used in the 1970s to measure 32 stellar diameters at optical wavele ...
Parallax and Its role In the helIocentrIc/GeocentrIc debate
... Your finger is like a nearby star, and the far wall is like the distant stars in the background. Your two eyes are like a telescope on Earth that is in two different positions as the Earth moves around the Sun. For example, in April a nearby star appears in one location (like looking through one eye ...
... Your finger is like a nearby star, and the far wall is like the distant stars in the background. Your two eyes are like a telescope on Earth that is in two different positions as the Earth moves around the Sun. For example, in April a nearby star appears in one location (like looking through one eye ...
Explores Angular Size - Chandra X
... how big something is in kilometers, instead of how big it appears to be in angular measure. To get this information, all we need to know is how far away the object is from us. The moon is 324,000 kilometers away, and Venus is about 40 million kilometers away from Earth at its closest distance. The f ...
... how big something is in kilometers, instead of how big it appears to be in angular measure. To get this information, all we need to know is how far away the object is from us. The moon is 324,000 kilometers away, and Venus is about 40 million kilometers away from Earth at its closest distance. The f ...
Why Aren`t All Galaxies Barred?
... very thin disks, indicating small velocities perpendicular to the plane, wh ich suggests little random motion in the other directions too. Thus, although the ca se is far from watertight, it seems unlikely that random motion in galaxies is sufficient to prevent the formation of a bar. We are also ab ...
... very thin disks, indicating small velocities perpendicular to the plane, wh ich suggests little random motion in the other directions too. Thus, although the ca se is far from watertight, it seems unlikely that random motion in galaxies is sufficient to prevent the formation of a bar. We are also ab ...
Lecture - Ann Arbor Earth Science
... spectrum of a star that is moving away from the Earth. Notice how the entire pattern of black lines has been shifted toward the red end of the spectrum. If the bottom band had been a star that is moving toward the Earth, then the pattern of black lines would have been shifted toward the blue end of ...
... spectrum of a star that is moving away from the Earth. Notice how the entire pattern of black lines has been shifted toward the red end of the spectrum. If the bottom band had been a star that is moving toward the Earth, then the pattern of black lines would have been shifted toward the blue end of ...
Chapter 8 powerpoint presentation
... The name of this method is a bit deceiving as it incorrectly implies some measure of stellar parallax. Actually, what happens is we obtain a spectrum for a star of unknown distance. We use the spectrum to determine the spectral type, which locates it on the x-axis of the H-R diagram. Now draw a line ...
... The name of this method is a bit deceiving as it incorrectly implies some measure of stellar parallax. Actually, what happens is we obtain a spectrum for a star of unknown distance. We use the spectrum to determine the spectral type, which locates it on the x-axis of the H-R diagram. Now draw a line ...
Letter to the Editor ASTRONOMY ASTROPHYSICS
... Toomre and Toomre (1972) and more recently Barnes (1988), have shown that the gigantic streamers of the type seen in the Antennae are likely to be provoked by gravity during a direct encounter of similarly massive disk galaxies. The remarkable slender tails would have been caused during a previous e ...
... Toomre and Toomre (1972) and more recently Barnes (1988), have shown that the gigantic streamers of the type seen in the Antennae are likely to be provoked by gravity during a direct encounter of similarly massive disk galaxies. The remarkable slender tails would have been caused during a previous e ...
Luminosity
... masses of the stars and the sizes of the orbits. Why is this so valuable to know? 1. We can predict how long an orbit will take 2. This is the main way we determine the masses of stars 3. This lets us know if two stars that look close together in the sky really are in orbit ...
... masses of the stars and the sizes of the orbits. Why is this so valuable to know? 1. We can predict how long an orbit will take 2. This is the main way we determine the masses of stars 3. This lets us know if two stars that look close together in the sky really are in orbit ...
Unit 8 Astronomy
... star can outshine all of the other stars in the galaxy in total for several days and may leave behind only a crushed core. ...
... star can outshine all of the other stars in the galaxy in total for several days and may leave behind only a crushed core. ...
NGC 5746 :: NGC 5746 Handout - Chandra X
... collapse to form spinning disks of stars and gas. The Chandra data and computer simulations show that the likely origin of NGC 5746's hot halo is the gradual inflow of intergalactic matter left over from the formation of the galaxy. Hot gas flowing outward has been observed in galaxies with vigorous ...
... collapse to form spinning disks of stars and gas. The Chandra data and computer simulations show that the likely origin of NGC 5746's hot halo is the gradual inflow of intergalactic matter left over from the formation of the galaxy. Hot gas flowing outward has been observed in galaxies with vigorous ...
The student will understand the hierarchical relationships of objects
... Recognize that there are enormous distances between objects in space. Explain how the speed of light is used to measure distance in space. Explain how astronomical bodies close to Earth are measured in AU units (distance between the Sun and Earth). Recognize that the universe contains many billions ...
... Recognize that there are enormous distances between objects in space. Explain how the speed of light is used to measure distance in space. Explain how astronomical bodies close to Earth are measured in AU units (distance between the Sun and Earth). Recognize that the universe contains many billions ...
Astronomy - Career Account Web Pages
... The most distant objects in the universe appear extremely red because their light is stretched to longer, redder wavelengths by the expansion of the universe. This object is at an extremely faint magnitude of 29, which is 500 million times fainter that the faintest stars seen by the human eye. The d ...
... The most distant objects in the universe appear extremely red because their light is stretched to longer, redder wavelengths by the expansion of the universe. This object is at an extremely faint magnitude of 29, which is 500 million times fainter that the faintest stars seen by the human eye. The d ...
Lecture 11 - University of Washington
... • Why there is an age spread of ∼ 3 Gyr among globular clusters (GCs)? We would expect < 1 Gyr spread (free-fall time). Some important questions that are left without robust answers: • Why GCs become more metal-poor with the distance from the center? • Detailed calculations of chemical enrichment pr ...
... • Why there is an age spread of ∼ 3 Gyr among globular clusters (GCs)? We would expect < 1 Gyr spread (free-fall time). Some important questions that are left without robust answers: • Why GCs become more metal-poor with the distance from the center? • Detailed calculations of chemical enrichment pr ...
Chapter 5 Galaxies and Star Systems
... Galaxy. One orbit of the solar system takes about 225 to 250 million years at a speed of half a million miles per hour. The solar system has orbited 20 to 25 times since it formed 4.6 billion years ago. The center of our galaxy is located about 28,000 light-years away, beyond the constellation Sagi ...
... Galaxy. One orbit of the solar system takes about 225 to 250 million years at a speed of half a million miles per hour. The solar system has orbited 20 to 25 times since it formed 4.6 billion years ago. The center of our galaxy is located about 28,000 light-years away, beyond the constellation Sagi ...
Astronomy 10 - UC Berkeley Astronomy w
... When the helium core is first formed, the core is not hot enough fuse the helium into heavier elements. Only once the red giant phase occurs, and the core contracts and heats up to a temperature of around 108 K is the core hot enough to start burning helium. (11) page 321, question 6 When a star she ...
... When the helium core is first formed, the core is not hot enough fuse the helium into heavier elements. Only once the red giant phase occurs, and the core contracts and heats up to a temperature of around 108 K is the core hot enough to start burning helium. (11) page 321, question 6 When a star she ...
151 - ESO
... much quicker than it decreases. This diagram indicates the regular pattern of changing brightness as a function of time: ...
... much quicker than it decreases. This diagram indicates the regular pattern of changing brightness as a function of time: ...
www.astro.caltech.edu
... physical cause (Figure 2). The host galaxies of short-duration GRBs (those whose gamma-ray emission lasts for 2 seconds or less) observed with Keck have been localized to a completely different host-galaxy population, one with characteristically low star-formation rates and in a few cases evidence o ...
... physical cause (Figure 2). The host galaxies of short-duration GRBs (those whose gamma-ray emission lasts for 2 seconds or less) observed with Keck have been localized to a completely different host-galaxy population, one with characteristically low star-formation rates and in a few cases evidence o ...
stargazing - davis.k12.ut.us
... heroines and beasts of their time and culture. Since those ancient times, people have continued to make up stories, develop religious practices and grow crops based on groups of stars. Groups of stars are called constellations, patterns of stars in the sky that have been identified and named. Some c ...
... heroines and beasts of their time and culture. Since those ancient times, people have continued to make up stories, develop religious practices and grow crops based on groups of stars. Groups of stars are called constellations, patterns of stars in the sky that have been identified and named. Some c ...
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.