lecture11
... The spectrum of a star: nearly a Black Body The light from a star is usually concentrated in a rather narrow range of wavelengths. The spectrum of a star’s light is approximately a black body spectrum. In fact, the spectrum of a star at the photosphere, before the light passes through the atmospher ...
... The spectrum of a star: nearly a Black Body The light from a star is usually concentrated in a rather narrow range of wavelengths. The spectrum of a star’s light is approximately a black body spectrum. In fact, the spectrum of a star at the photosphere, before the light passes through the atmospher ...
death_low_mass
... • Stars form in clusters, with all types of stars forming. O,B,A,F,G,K,M • Spiral arms barely move, but gas clouds and stars orbit around the galaxy moving in and out of spiral arms • From the HR diagram, by far the most luminous stars are the O-type stars. Their luminosity can be 100,000 times the ...
... • Stars form in clusters, with all types of stars forming. O,B,A,F,G,K,M • Spiral arms barely move, but gas clouds and stars orbit around the galaxy moving in and out of spiral arms • From the HR diagram, by far the most luminous stars are the O-type stars. Their luminosity can be 100,000 times the ...
The Life Cycle of Stars Stars are a fascinating part of our universe
... (97%) and Helium (3%) gas. Gravity causes the dust and gas to clump together. The number of atoms in the clump increases and the mass of the clump increases. This initial mass determines the mass of the star. As the gravitational attraction in the nebula grows the clump contracts and flattens into a ...
... (97%) and Helium (3%) gas. Gravity causes the dust and gas to clump together. The number of atoms in the clump increases and the mass of the clump increases. This initial mass determines the mass of the star. As the gravitational attraction in the nebula grows the clump contracts and flattens into a ...
Notes (PowerPoint)
... from numerous observations, e.g. “someone broke in and stole the teapot and spoons” o Open window, teapot and spoons missing, palm-print on window, boot marks outside ...
... from numerous observations, e.g. “someone broke in and stole the teapot and spoons” o Open window, teapot and spoons missing, palm-print on window, boot marks outside ...
AS1001:Extra-Galactic Astronomy Stars and Gas in Galaxies
... • Found by Fritz Zwicky (1930s). • Pre-dates rotation curve observations and analysis (1975). • Galaxies in clusters have very large observed velocities ( v ~ 1000 km/s ). • Galaxy clusters should be unbound! • But clusters ARE bound, so more mass must be present than the luminous matter. • Da ...
... • Found by Fritz Zwicky (1930s). • Pre-dates rotation curve observations and analysis (1975). • Galaxies in clusters have very large observed velocities ( v ~ 1000 km/s ). • Galaxy clusters should be unbound! • But clusters ARE bound, so more mass must be present than the luminous matter. • Da ...
Astronomy
... (b) Describe the similarities and differences of several types of astronomical telescopes. (c) Explain the purposes of at least three instruments used with astronomical telescopes. (d) Describe the proper care and storage of telescopes and binoculars both at home and in the ...
... (b) Describe the similarities and differences of several types of astronomical telescopes. (c) Explain the purposes of at least three instruments used with astronomical telescopes. (d) Describe the proper care and storage of telescopes and binoculars both at home and in the ...
Stellar Luminosities
... • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring out how they produce ...
... • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring out how they produce ...
HR Diagram (Temperature Versus Absolute Magnitude)
... • Astronomical units can be used to measure distances within our solar systems ...
... • Astronomical units can be used to measure distances within our solar systems ...
Magnitude of Stars - What`s Out Tonight?
... the stars don’t move and are fixed in the sky. This is how astronomers look upon the stars for everyday use. However, all stars including our Sun are moving through space. Individually the stars are moving quite fast but because they are very far from one other, they appear to be moving extremely sl ...
... the stars don’t move and are fixed in the sky. This is how astronomers look upon the stars for everyday use. However, all stars including our Sun are moving through space. Individually the stars are moving quite fast but because they are very far from one other, they appear to be moving extremely sl ...
Prof. Kenney C lass 8 September 26, 2016
... 2. Red Giant I (fusing H in shell, no fusion in core) After it fuses all of H in core to He, there is no more H fuel in core to provide the energy & pressure to balance gravity So you’d think that the star would collapse (& not expand/get bigger) But what happens… Core shrinks & heats up Until layer ...
... 2. Red Giant I (fusing H in shell, no fusion in core) After it fuses all of H in core to He, there is no more H fuel in core to provide the energy & pressure to balance gravity So you’d think that the star would collapse (& not expand/get bigger) But what happens… Core shrinks & heats up Until layer ...
- Stevenson High School
... Learning to Use the Star Wheel: Use your star wheel to help answer the questions. The rotation of the Earth on its axis causes the stars to rise and set each evening. In addition, the orbit of the Earth around the Sun places different regions of the sky in our nighttime view. A chart of the night sk ...
... Learning to Use the Star Wheel: Use your star wheel to help answer the questions. The rotation of the Earth on its axis causes the stars to rise and set each evening. In addition, the orbit of the Earth around the Sun places different regions of the sky in our nighttime view. A chart of the night sk ...
Stars PowerPoint
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
The Milky Way Galaxy
... Rotation Rates Not all parts of the galaxy are rotating at the same rate Differential Rotation The measurement of stars’ velocities show that the velocities increase rather sharply, like that of a rigid body, and then continue to increase with a slow rise This behavior for the orbital velocities ca ...
... Rotation Rates Not all parts of the galaxy are rotating at the same rate Differential Rotation The measurement of stars’ velocities show that the velocities increase rather sharply, like that of a rigid body, and then continue to increase with a slow rise This behavior for the orbital velocities ca ...
Slide 1
... Binary Stars More than 50 % of all stars in our Milky Way are not single stars, but belong to binaries: Pairs or multiple systems of stars which orbit their common center of mass. If we can measure and understand their orbital motion, we can estimate the stellar masses. ...
... Binary Stars More than 50 % of all stars in our Milky Way are not single stars, but belong to binaries: Pairs or multiple systems of stars which orbit their common center of mass. If we can measure and understand their orbital motion, we can estimate the stellar masses. ...
November - LVAstronomy.com
... monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on ...
... monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on ...
Making Heavier Metals
... The production of elements heavier than Iron takes place by adding neutrons to the atomic nuclei. These neutral particles do not feel any electrical repulsion from the charged nuclei. They can therefore easily approach them and thereby create heavier nuclei. This is indeed the way the heaviest chemi ...
... The production of elements heavier than Iron takes place by adding neutrons to the atomic nuclei. These neutral particles do not feel any electrical repulsion from the charged nuclei. They can therefore easily approach them and thereby create heavier nuclei. This is indeed the way the heaviest chemi ...
V = 3 d3 = 4188.8 pc N = ρV = 0.1 pc χ 4188.8 pc = 419
... To find the largest stellar mass for which all planets in the habitable zone are tidally locked, we can just equate douter in the expression above with dlock in the expression for the tidal locking radius given in the question text. For the left hand side of the equation above, we get, ...
... To find the largest stellar mass for which all planets in the habitable zone are tidally locked, we can just equate douter in the expression above with dlock in the expression for the tidal locking radius given in the question text. For the left hand side of the equation above, we get, ...
The Hubble Space Telescope - the first 10 years
... • Galaxies are believed start from small sub-clumps which through merging build themselves up to giant ellipticals and spirals. Here we see the merger of two giant spirals which will one day become a giant elliptical. The core of each galaxy is seen in red and most likely each core contains a giant ...
... • Galaxies are believed start from small sub-clumps which through merging build themselves up to giant ellipticals and spirals. Here we see the merger of two giant spirals which will one day become a giant elliptical. The core of each galaxy is seen in red and most likely each core contains a giant ...
Life in the Universe
... On a clear night, with 20/20 vision, one can see about 3,000 stars at a given time. Ancient astronomers traced out “pictures” using groups of these stars. “Group of Stars” in Latin constellations ...
... On a clear night, with 20/20 vision, one can see about 3,000 stars at a given time. Ancient astronomers traced out “pictures” using groups of these stars. “Group of Stars” in Latin constellations ...
ATA2010
... • the accretion of smaller galaxies which become absorbed in the larger system. A major goal is to determine how important these accretion events were in building up the Galactic disk and the bulge. Our current galaxy formation theory based on Cold Dark Matter predicts a very high level of accretion ...
... • the accretion of smaller galaxies which become absorbed in the larger system. A major goal is to determine how important these accretion events were in building up the Galactic disk and the bulge. Our current galaxy formation theory based on Cold Dark Matter predicts a very high level of accretion ...
The Origin, Structure, and Evolution of the Stars
... brightness. This is identical to the ratio of the energy radiated by the star to the energy radiated by the sun. The color or temperature is plotted along the horizontal scale with the blue or high temperature stars on the left and the red or low temperature stars on the right. Figure 2 illustrates ...
... brightness. This is identical to the ratio of the energy radiated by the star to the energy radiated by the sun. The color or temperature is plotted along the horizontal scale with the blue or high temperature stars on the left and the red or low temperature stars on the right. Figure 2 illustrates ...
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.