The Universe and Galaxies - West Jefferson Local Schools
... - ________ - grouping of millions or billions of stars, and dust and gas held together by gravity - there are an estimated ________ billion galaxies in the universe A. 3 Types of Galaxies - classified by ________ 1. ________ - disk shaped with spiral arms of dust and gas (fig 26-15, pg. 831) - dust ...
... - ________ - grouping of millions or billions of stars, and dust and gas held together by gravity - there are an estimated ________ billion galaxies in the universe A. 3 Types of Galaxies - classified by ________ 1. ________ - disk shaped with spiral arms of dust and gas (fig 26-15, pg. 831) - dust ...
Stellar Spectra
... • We use a telescope with a spectrograph to measure and record the spectrum of a star. • This gives us the brightness of the star at different wavelengths. n Like ...
... • We use a telescope with a spectrograph to measure and record the spectrum of a star. • This gives us the brightness of the star at different wavelengths. n Like ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... brilliant objects in their home galaxies, visible from millions or even billions of light-years away. Supernovae are of several distinct types, as is evident from their spectra—the graphs astronomers plot showing the distribution of colors of the supernova light. One major category is core-collapse ...
... brilliant objects in their home galaxies, visible from millions or even billions of light-years away. Supernovae are of several distinct types, as is evident from their spectra—the graphs astronomers plot showing the distribution of colors of the supernova light. One major category is core-collapse ...
Stellar evolution, II
... As the hydrogen in the core of a star is transformed into helium, the matter in the core becomes degenerate. In a low density gas many possible energy levels of the electrons are open, but as the gas become denser all the lower energy levels are filled. The Pauli exclusion principle states that eac ...
... As the hydrogen in the core of a star is transformed into helium, the matter in the core becomes degenerate. In a low density gas many possible energy levels of the electrons are open, but as the gas become denser all the lower energy levels are filled. The Pauli exclusion principle states that eac ...
File
... The explosion called a supernova occurs after a large star has become a red supergiant. When the star stops expanding because it can no longer create enough energy to support its own mass, it collapses completely and makes a giant explosion. A supernova is brighter than all the stars in the galaxy c ...
... The explosion called a supernova occurs after a large star has become a red supergiant. When the star stops expanding because it can no longer create enough energy to support its own mass, it collapses completely and makes a giant explosion. A supernova is brighter than all the stars in the galaxy c ...
Hertzsprung-Russell (H-R) Diagram Hertzsprung-Russell Diagram March 16 −
... Do you understand? Reading HertzsprungRussell Diagram Main sequence is a mass sequence Lifetime of stars Do you understand? HR Diagram of star cluster ...
... Do you understand? Reading HertzsprungRussell Diagram Main sequence is a mass sequence Lifetime of stars Do you understand? HR Diagram of star cluster ...
Ast 405, Pulsating Stars The following is based Chapter 14 of the
... The following is based Chapter 14 of the book. • 1. Stars whose brightness varies regularly due to some internal mechanism. • 2. Examples are Miras, Cepheids, RR Lyraes, W Virginis, BL Her stars. You shouyld be familiar with Table 14.1 in the book. • 3. The Cepheid Period-Luminosity relation, or PL ...
... The following is based Chapter 14 of the book. • 1. Stars whose brightness varies regularly due to some internal mechanism. • 2. Examples are Miras, Cepheids, RR Lyraes, W Virginis, BL Her stars. You shouyld be familiar with Table 14.1 in the book. • 3. The Cepheid Period-Luminosity relation, or PL ...
The Stars
... • Stellar properties are determined solely by their mass, composition, age, and rotation rate. • The properties of main sequence stars are largely determined by their masses. • Single stars are spherical, unless distorted by rotation ...
... • Stellar properties are determined solely by their mass, composition, age, and rotation rate. • The properties of main sequence stars are largely determined by their masses. • Single stars are spherical, unless distorted by rotation ...
Stars
... star, but you see the Doppler shift (lecture 2B) due to its orbital motion. – Double-line – see lines from both stars – Single-line – see only one set of lines ...
... star, but you see the Doppler shift (lecture 2B) due to its orbital motion. – Double-line – see lines from both stars – Single-line – see only one set of lines ...
An introduction to the HR diagram File
... • These high mass stars finish their lives in massive supernova explosions • At the bottom right the stars are cool. These low mass stars are very long lived as they use their fuel so slowly. Very low mass M stars live many billions of years and will simply run out of fuel without dramatic events. ...
... • These high mass stars finish their lives in massive supernova explosions • At the bottom right the stars are cool. These low mass stars are very long lived as they use their fuel so slowly. Very low mass M stars live many billions of years and will simply run out of fuel without dramatic events. ...
PowerPoint File
... unstable and sends thermal pulses through the star, throwing off the outer layers of the star into space. As the outer layers are peeled back, it reveals the extremely hot, ultraviolet-emitting carbon and oxygen core which ionizes the stellar wind ...
... unstable and sends thermal pulses through the star, throwing off the outer layers of the star into space. As the outer layers are peeled back, it reveals the extremely hot, ultraviolet-emitting carbon and oxygen core which ionizes the stellar wind ...
GEARS Workshop Monday - Georgia Southern University
... • Let’s think back to initial categories made of star image • Having made a few measurements now – let’s list the intrinsic properties of stars on the board together ...
... • Let’s think back to initial categories made of star image • Having made a few measurements now – let’s list the intrinsic properties of stars on the board together ...
Phys 214. Planets and Life
... The Big Bang Evidence 2 A second evidence that supports the Big Bang theory is the overall chemical composition of the Universe. Calculations predict that the composition of the Universe should be about three fourths hydrogen and one fourth helium by mass, being a closed match to the overall chemic ...
... The Big Bang Evidence 2 A second evidence that supports the Big Bang theory is the overall chemical composition of the Universe. Calculations predict that the composition of the Universe should be about three fourths hydrogen and one fourth helium by mass, being a closed match to the overall chemic ...
Consider Average Stars
... actually see – is partly an accident of location: nearby stars can look deceptively bright. (The obvious example is the Sun!) But the intrinsic (true) brightness of a star is a good measure of how much energy is being generated, how fast the fuel is being consumed, etc. So it’s something ...
... actually see – is partly an accident of location: nearby stars can look deceptively bright. (The obvious example is the Sun!) But the intrinsic (true) brightness of a star is a good measure of how much energy is being generated, how fast the fuel is being consumed, etc. So it’s something ...
Stars
... • Normally atoms would repel each other, but the core of stars is so hot that the atoms fuse ...
... • Normally atoms would repel each other, but the core of stars is so hot that the atoms fuse ...
Cosmic context: stars and formation of heavy elements
... Endpoint of such stars is a planetary nebula and a white dwarf: ...
... Endpoint of such stars is a planetary nebula and a white dwarf: ...
Stellar Evolution 1 Star Formation 2 Nebulae
... What are the basic properties of giant molecular clouds? How do clumps form in giant molecular clouds? How do clumps in giant molecular clouds evolve? What are the conditions for which this kind of evolution takes place? Where are protostars found on an H-R diagram? How do their locations on ...
... What are the basic properties of giant molecular clouds? How do clumps form in giant molecular clouds? How do clumps in giant molecular clouds evolve? What are the conditions for which this kind of evolution takes place? Where are protostars found on an H-R diagram? How do their locations on ...
Lecture notes -- pdf file - University of Iowa Astrophysics
... So what are the distances to the stars? • First measurements made in 1838 (Friedrich Bessel) • Closest star is Alpha Centauri, p=0.75 arcseconds, d=1.33 parsecs= 4.35 light years • Nearest stars are a few to many parsecs, 5 - 20 light years ...
... So what are the distances to the stars? • First measurements made in 1838 (Friedrich Bessel) • Closest star is Alpha Centauri, p=0.75 arcseconds, d=1.33 parsecs= 4.35 light years • Nearest stars are a few to many parsecs, 5 - 20 light years ...
The Sun . . .
... 90% of stars are main sequence. Supergiant: 20 to 200 times larger than the Sun, but also much brighter, cooler and less dense. Dwarf: Small stars; fairly hot but very dim. Diameter is about the same as Earth, but their mass is equal to the sun . . . ...
... 90% of stars are main sequence. Supergiant: 20 to 200 times larger than the Sun, but also much brighter, cooler and less dense. Dwarf: Small stars; fairly hot but very dim. Diameter is about the same as Earth, but their mass is equal to the sun . . . ...
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.