Last time: looked at proton-proton chain to convert Hydrogen into
... Young stars which are still accreting material are called T-Tauri Stars. Because mass is piling on, they sometimes have explosive outbursts. ...
... Young stars which are still accreting material are called T-Tauri Stars. Because mass is piling on, they sometimes have explosive outbursts. ...
Astronomy Day 2006: A short presentation on eclipsing binary stars
... It is recognized as fact by astronomers that well over half of the stars in the universe belong to multiple systems. You might think of our Sun as being an exceptional system that involves only one star and you would be right. ...
... It is recognized as fact by astronomers that well over half of the stars in the universe belong to multiple systems. You might think of our Sun as being an exceptional system that involves only one star and you would be right. ...
Active Galaxies and Quasars: the most luminous objects in the
... At the distances estimated from the redshifts of the emission lines, quasars have a luminosity 10 - 10,000x the integrated light of all the stars in the Milky Way. ...
... At the distances estimated from the redshifts of the emission lines, quasars have a luminosity 10 - 10,000x the integrated light of all the stars in the Milky Way. ...
Chapter 30 Notes
... Some white dwarfs revolve around red giants. When this happens the white dwarf may capture some gases from the red giant. As these gases accumulate pressure begins to build up. This pressure can cause large explosions called novas. A supernova is when the explosion is so large that it completely des ...
... Some white dwarfs revolve around red giants. When this happens the white dwarf may capture some gases from the red giant. As these gases accumulate pressure begins to build up. This pressure can cause large explosions called novas. A supernova is when the explosion is so large that it completely des ...
X-ray Binaries and Cygnus X-1
... about a common center of mass. The compact object pulls mass off of the outer atmospheres of the normal star and the particles spiral down toward the compact object, creating an accretion disk. Because of the internal friction caused by the spiraling particles, the disk heats up to millions of Kelvi ...
... about a common center of mass. The compact object pulls mass off of the outer atmospheres of the normal star and the particles spiral down toward the compact object, creating an accretion disk. Because of the internal friction caused by the spiraling particles, the disk heats up to millions of Kelvi ...
Astronomy Review revised Key
... 23. If the star is located 4.3 light years away, how long will it be before we see the light of the star? 4.4 years. 18. What is the Big Bang Theory? The theory that all matter was once condensed into a single point called the singularity, and that singularity exploded sending matter out in all dir ...
... 23. If the star is located 4.3 light years away, how long will it be before we see the light of the star? 4.4 years. 18. What is the Big Bang Theory? The theory that all matter was once condensed into a single point called the singularity, and that singularity exploded sending matter out in all dir ...
Chapter 14 The Milky Way Galaxy
... Observation of such events suggests that low-mass white dwarfs could account for about half of the mass needed. The rest is still a mystery. ...
... Observation of such events suggests that low-mass white dwarfs could account for about half of the mass needed. The rest is still a mystery. ...
Announcements
... jumps up to a higher level, or when an electron in a higher level emits a photon and jumps down to the 2nd level. ...
... jumps up to a higher level, or when an electron in a higher level emits a photon and jumps down to the 2nd level. ...
Life_Cycle_of_a_Star_Powerpoint
... • This phase will last until the star exhausts its remaining fuel. • The pressure of the nuclear reaction is not strong enough to equalize the force of gravity so the star will collapse. ...
... • This phase will last until the star exhausts its remaining fuel. • The pressure of the nuclear reaction is not strong enough to equalize the force of gravity so the star will collapse. ...
High Mass Stars
... – From H-R diagram its luminosity is 100000 times greater than the Sun’s. – It therefore burns fuel (uses it’s mass) 100000 times faster than the Sun. – It has 25 times the mass of the Sun so its lifetime will be 25/100000 = 0.00025 times than the Sun’s lifetime = 2.5 million years. ...
... – From H-R diagram its luminosity is 100000 times greater than the Sun’s. – It therefore burns fuel (uses it’s mass) 100000 times faster than the Sun. – It has 25 times the mass of the Sun so its lifetime will be 25/100000 = 0.00025 times than the Sun’s lifetime = 2.5 million years. ...
Stellar Evolution Chapter 12
... b. Objects below this mass can only form in HI clouds. c. Objects below this mass are not hot enough to fuse normal hydrogen. d. They form too slowly and hot stars nearby clear the gas and dust quickly. e. Our telescopes do not have enough light gathering power to detect dim objects. ...
... b. Objects below this mass can only form in HI clouds. c. Objects below this mass are not hot enough to fuse normal hydrogen. d. They form too slowly and hot stars nearby clear the gas and dust quickly. e. Our telescopes do not have enough light gathering power to detect dim objects. ...
Powerpoint
... What could this “dark matter” be? It is dark at all wavelengths, not just the visible. Accounts for 90% of mass • Stellar-mass black holes? ...
... What could this “dark matter” be? It is dark at all wavelengths, not just the visible. Accounts for 90% of mass • Stellar-mass black holes? ...
Luminosity
... The stars are not randomly distributed on the diagram. There are 3 features that emerge from the H-R diagram: Most stars fall on a strip extending diagonally across the diagram from top left to bottom right. This is called the MAIN SEQUENCE. Some large stars, reddish in colour occupy the top ...
... The stars are not randomly distributed on the diagram. There are 3 features that emerge from the H-R diagram: Most stars fall on a strip extending diagonally across the diagram from top left to bottom right. This is called the MAIN SEQUENCE. Some large stars, reddish in colour occupy the top ...
Lecture Notes – Stars
... (2) The star goes through successive red supergiant phases (like points C–G for 1 M star) between each nuclear burning phase. (3) After each nuclear burning stage, the reaction continues in a shell around the core. At least conceptually, the star eventually has an onion-like internal structure with ...
... (2) The star goes through successive red supergiant phases (like points C–G for 1 M star) between each nuclear burning phase. (3) After each nuclear burning stage, the reaction continues in a shell around the core. At least conceptually, the star eventually has an onion-like internal structure with ...
Galaxy3
... • After the interaction, there will be increased star formation for quite some time, as molecular clouds continue to collide with the spiral density waves. • Over time, self-sustained star formation and disruption of the density wave, causes the Sshape density wave to fragment into spurs. Then there ...
... • After the interaction, there will be increased star formation for quite some time, as molecular clouds continue to collide with the spiral density waves. • Over time, self-sustained star formation and disruption of the density wave, causes the Sshape density wave to fragment into spurs. Then there ...
BIO 10 Lecture 2
... – the axes of most planets are at right angles to their plane of orbit – all the planets revolve around the sun in roughly the same plane – All evidence to date suggests that the planets and sun are roughly the same age ...
... – the axes of most planets are at right angles to their plane of orbit – all the planets revolve around the sun in roughly the same plane – All evidence to date suggests that the planets and sun are roughly the same age ...
EARTH SCIENCE HOMEWORK 11-7 Sun`s surface
... 6. Coronal _______ __________ (CMEs) (2 words) occur when large amounts of electrically charged gas are ejected suddenly from the Sun’s ____________. (pg. 731, P1) 7. CME’s can occur as often as two or three times a day during a ___________ __________. (2 words) (pg. 731, P1) 8. CMEs can damage ____ ...
... 6. Coronal _______ __________ (CMEs) (2 words) occur when large amounts of electrically charged gas are ejected suddenly from the Sun’s ____________. (pg. 731, P1) 7. CME’s can occur as often as two or three times a day during a ___________ __________. (2 words) (pg. 731, P1) 8. CMEs can damage ____ ...
OVERVIEW: Stars and space
... form a very hot dense object about the size of the Earth called a white dwarf. The rest of the Sun is blown away to form a planetary nebula (from which a new star might form). The white dwarf will gradually cool over billions of years to form a black dwarf. The Ring Nebula ...
... form a very hot dense object about the size of the Earth called a white dwarf. The rest of the Sun is blown away to form a planetary nebula (from which a new star might form). The white dwarf will gradually cool over billions of years to form a black dwarf. The Ring Nebula ...
Section 27.2
... Luminosity is the total amount of light given off by a star in all directions. Luminosity is a fundamental property of a star whereas brightness depends on both luminosity and distance. ...
... Luminosity is the total amount of light given off by a star in all directions. Luminosity is a fundamental property of a star whereas brightness depends on both luminosity and distance. ...
Stellar Remnants
... •from 1.4 to about 3 solar masses •Made of pure neutrons – a giant atomic nucleus •About 20 km in diameter •One cc would weigh about a million tons ...
... •from 1.4 to about 3 solar masses •Made of pure neutrons – a giant atomic nucleus •About 20 km in diameter •One cc would weigh about a million tons ...
Review for Astronomy 3 Midterm #2
... hydrogen to begin to fuse to helium. It will do this very quickly and then explode and be thrown from the white dwarf. Nova can be periodic, which means they can occur over and over again on the same star. Type I Supernovae also occur in systems consisting of a white dwarf and a main sequence/red ...
... hydrogen to begin to fuse to helium. It will do this very quickly and then explode and be thrown from the white dwarf. Nova can be periodic, which means they can occur over and over again on the same star. Type I Supernovae also occur in systems consisting of a white dwarf and a main sequence/red ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.