1 Cosmology: a brief refresher course
... to form heavier nuclei, they cannot immediately do so, as immediately after freeze-out there are still too many extremely high energy photons around, and these photodisintegrate any heavy nuclei that form. As the Universe expands and cools, however, the number density of these photons falls off expo ...
... to form heavier nuclei, they cannot immediately do so, as immediately after freeze-out there are still too many extremely high energy photons around, and these photodisintegrate any heavy nuclei that form. As the Universe expands and cools, however, the number density of these photons falls off expo ...
Parallax
... 3. The smallest parallax angle that can be accurately measured from the ground is 0.01 arc seconds. If the angle is smaller than 0.01 arcseconds we do not have a protractor good enough to measure the angle. You measure a star to have a parallax angle of 0.01 arc seconds. How far away is that star i ...
... 3. The smallest parallax angle that can be accurately measured from the ground is 0.01 arc seconds. If the angle is smaller than 0.01 arcseconds we do not have a protractor good enough to measure the angle. You measure a star to have a parallax angle of 0.01 arc seconds. How far away is that star i ...
Lectures 19-20 The Milky Way Galaxy
... (~2 micron) to help see through the dust. This is helpful because there are large number of K and M giant stars (T ~ 4000 K) in the central part of the galaxy, and these are brightest in at 2-micron. Note that the nearest star to the Sun is ~1 pc away. The density of stars is much higher in the Gala ...
... (~2 micron) to help see through the dust. This is helpful because there are large number of K and M giant stars (T ~ 4000 K) in the central part of the galaxy, and these are brightest in at 2-micron. Note that the nearest star to the Sun is ~1 pc away. The density of stars is much higher in the Gala ...
Course Outline - Tony Bacigalupo
... The region of a galaxy beyond the visible halo where dark matter is believed to reside Composition? ...
... The region of a galaxy beyond the visible halo where dark matter is believed to reside Composition? ...
Survey of Astrophysics A110 The Milky Way Galaxy
... 3. Found in the Galactic disk. 4. Spectral analysis shows that they have chemical compositions like the Sun (Population I type stars). – 5. They have long main sequences on the HR diagram which indicate that they are young (e.g., many contain young hot O and B type Population I stars). ...
... 3. Found in the Galactic disk. 4. Spectral analysis shows that they have chemical compositions like the Sun (Population I type stars). – 5. They have long main sequences on the HR diagram which indicate that they are young (e.g., many contain young hot O and B type Population I stars). ...
The connection between stellar activity cycles and magnetic field
... an instrumental role in advancing knowledge of stellar cycles via multi-decade chromospheric observations of solar-like stars (Wilson 1978; Baliunas et al. 1995; Metcalfe et al. 2013; Egeland et al. 2015). Further observational campaigns have also been directly inspired by the work done at the Mount ...
... an instrumental role in advancing knowledge of stellar cycles via multi-decade chromospheric observations of solar-like stars (Wilson 1978; Baliunas et al. 1995; Metcalfe et al. 2013; Egeland et al. 2015). Further observational campaigns have also been directly inspired by the work done at the Mount ...
• Teacher developed presentations. • Teacher developed laboratory
... The primary focus of this unit is to understand the processes of astronomy. The processes include formation of the universe and solar system, the roll of gravity in the formation and motion of planets, using the HR diagram to explain star characteristics and life spans, describing how we use light t ...
... The primary focus of this unit is to understand the processes of astronomy. The processes include formation of the universe and solar system, the roll of gravity in the formation and motion of planets, using the HR diagram to explain star characteristics and life spans, describing how we use light t ...
Constellation Catalog
... Additional Interesting Facts: 1.Aries is meant to look like a jumping, dashing ram. 2. To ancient Greek culture the horns of Aries is a symbol of renewal and fertility. 3. Aries is a binary star system. 4. Aries represents Confidence, stubbornness, generosity, and impulsiveness. 5. Aries is the seco ...
... Additional Interesting Facts: 1.Aries is meant to look like a jumping, dashing ram. 2. To ancient Greek culture the horns of Aries is a symbol of renewal and fertility. 3. Aries is a binary star system. 4. Aries represents Confidence, stubbornness, generosity, and impulsiveness. 5. Aries is the seco ...
Course Materials - Weber State University
... 1. Write down on your worksheet your prediction for the cause of the seasons. Do not worry if you are not sure---that's the point of this exercise! Just write something reasonable down. This is your working model of the 'reason for the seasons'. 2. Now, answer the following questions about YOUR mode ...
... 1. Write down on your worksheet your prediction for the cause of the seasons. Do not worry if you are not sure---that's the point of this exercise! Just write something reasonable down. This is your working model of the 'reason for the seasons'. 2. Now, answer the following questions about YOUR mode ...
Astronomical Facts `n Stuff
... A measure of the true brightness of an object. The absolute brightness or magnitude of an object is the apparent brightness or magnitude it would have if it were located exactly 32.6 light-years (10 parsecs) away. Absolute Magnitude A scale for measuring the actual brightness of a celestial object w ...
... A measure of the true brightness of an object. The absolute brightness or magnitude of an object is the apparent brightness or magnitude it would have if it were located exactly 32.6 light-years (10 parsecs) away. Absolute Magnitude A scale for measuring the actual brightness of a celestial object w ...
Extrasolar Cosmochemistry
... white dwarfs provide an opportunity to address these questions. After undergoing extensive evolution, stars with initial main-sequence masses less than eight times that of the Sun ultimately shed most of their primordial material and shrink in size to become white dwarfs composed primarily of carbon ...
... white dwarfs provide an opportunity to address these questions. After undergoing extensive evolution, stars with initial main-sequence masses less than eight times that of the Sun ultimately shed most of their primordial material and shrink in size to become white dwarfs composed primarily of carbon ...
Document
... discerned two classes: the spiral galaxies, which resembled the Milky Way and a second class of objects, less conspicuous in appearance, the elliptical galaxies (Fig. 1.1). Based on his observations, Hubble constructed a galaxy classification scheme that is still in use today (Hubble, 1936). The bas ...
... discerned two classes: the spiral galaxies, which resembled the Milky Way and a second class of objects, less conspicuous in appearance, the elliptical galaxies (Fig. 1.1). Based on his observations, Hubble constructed a galaxy classification scheme that is still in use today (Hubble, 1936). The bas ...
Chapter 10
... 2. On the H-R diagram, trace the path of a typical star during its formation and its evolution into a red giant. How can star clusters help us check test this theory? 3. Describe the steps in the formation of a white dwarf star and a planetary nebula beginning at the red giant stage. 4. Describe the ...
... 2. On the H-R diagram, trace the path of a typical star during its formation and its evolution into a red giant. How can star clusters help us check test this theory? 3. Describe the steps in the formation of a white dwarf star and a planetary nebula beginning at the red giant stage. 4. Describe the ...
1 Distance: A History of Parallax and Brief Introduction to Standard
... not born with ability of depth perception—it is something the brain adapts to over time. Often one notices an infant in waving their hands about wildly believing they can reach the objects on an out-of-reach mobile suspended above their crib. These “lessons” will help the infant acquire depth percep ...
... not born with ability of depth perception—it is something the brain adapts to over time. Often one notices an infant in waving their hands about wildly believing they can reach the objects on an out-of-reach mobile suspended above their crib. These “lessons” will help the infant acquire depth percep ...
UV, IR, and mm Studies of CO Surrounding the Red Supergiant α
... Figure 1 shows a simulated uv spectrum with just the S1 and S2 shells. The spectrum of the stellar disk (red) shows the deep absorption first described by Wahlgren et al. (1992, ASP Conf Ser. 26, p. 37) and analyzed by Carpenter et al. (1994, ApJ 428, 329). The scattered emission (blue) is an import ...
... Figure 1 shows a simulated uv spectrum with just the S1 and S2 shells. The spectrum of the stellar disk (red) shows the deep absorption first described by Wahlgren et al. (1992, ASP Conf Ser. 26, p. 37) and analyzed by Carpenter et al. (1994, ApJ 428, 329). The scattered emission (blue) is an import ...
The Probability and Effects of an Asteroid Impact with Earth
... Since most observations of d Cephei are done in normal lighting conditions, use of a comparison chart with star magnitudes adjusted for dark adaption is inappropriate. Observations near the visual limit are also more accurate than those made of bright stars using telescopes, so the ideal observatio ...
... Since most observations of d Cephei are done in normal lighting conditions, use of a comparison chart with star magnitudes adjusted for dark adaption is inappropriate. Observations near the visual limit are also more accurate than those made of bright stars using telescopes, so the ideal observatio ...
The Cosmic Perspective Our Galaxy
... – Gas from dying stars mixes new elements into the interstellar medium, which slowly cools, making the molecular clouds where stars form. – Those stars will eventually return much of their matter to interstellar space. • Where do stars tend to form in our galaxy? – Active star-forming regions co ...
... – Gas from dying stars mixes new elements into the interstellar medium, which slowly cools, making the molecular clouds where stars form. – Those stars will eventually return much of their matter to interstellar space. • Where do stars tend to form in our galaxy? – Active star-forming regions co ...
RXTE PCA Contributions to Monitoring Fast Transients
... Characteristics of the Transients Recurrence times of the transient outbursts range upward from 1/2 year. Duration of outburst is (roughly) correlated with peak luminosity in the same object and probably from object to object. Caveats: Rapid Burster and GRS 1747-312: similar durations, different lu ...
... Characteristics of the Transients Recurrence times of the transient outbursts range upward from 1/2 year. Duration of outburst is (roughly) correlated with peak luminosity in the same object and probably from object to object. Caveats: Rapid Burster and GRS 1747-312: similar durations, different lu ...
134-Notes-a
... The magnitude scale so far has described what is called the apparent magnitude, which measures how much light we receive here at earth. This does not tells us the intrinsic brightness of the object (related to the luminosity). The varying distances between earth and objects cause the apparent magnit ...
... The magnitude scale so far has described what is called the apparent magnitude, which measures how much light we receive here at earth. This does not tells us the intrinsic brightness of the object (related to the luminosity). The varying distances between earth and objects cause the apparent magnit ...
Solutions
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
Astronomy Assignment #1
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
X-Ray Properties of Young Stars and Stellar Clusters
... Star and planet formation is generally viewed as a hydrodynamic process involving gravitational collapse of interstellar material at low temperatures, 10–100 K in molecular cloud cores and 100–1500 K in protoplanetary disks. If thermodynamical equilibrium holds, this material should be neutral excep ...
... Star and planet formation is generally viewed as a hydrodynamic process involving gravitational collapse of interstellar material at low temperatures, 10–100 K in molecular cloud cores and 100–1500 K in protoplanetary disks. If thermodynamical equilibrium holds, this material should be neutral excep ...
A Bayesian method for the detection of planetary transits
... crossing of a sunspot lasts about 14 days, which is fortunately much longer than planetary transits whose expected duration are several hours. On the other hand, the lifetimes of sunspot groups are quite sparse: approximately 50% of them lasts only two days, and 10% lasts more than 11 days (Richard ...
... crossing of a sunspot lasts about 14 days, which is fortunately much longer than planetary transits whose expected duration are several hours. On the other hand, the lifetimes of sunspot groups are quite sparse: approximately 50% of them lasts only two days, and 10% lasts more than 11 days (Richard ...
R136a1
RMC 136a1 (usually abbreviated to R136a1) is a Wolf-Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula. It lies at a distance of about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. It has the highest mass and luminosity of any known star, at 265 M☉ and 8.7 million L☉, and also one of the hottest at over 50,000 K.