L and T Dwarfs - Indiana University
... radiation trapped by extra dust-grain opacity • Heating dissociates H2O, giving weaker water bands • Dust settles gravitationally, depleting metals and leaving ...
... radiation trapped by extra dust-grain opacity • Heating dissociates H2O, giving weaker water bands • Dust settles gravitationally, depleting metals and leaving ...
Correcting the Gross Misinterpretation of Black Dwarf
... in any way connected to the pseudoscientific theories accepted in astronomy today, but are real objects that can be experimented on and have firm foundations in observation for hundreds of thousands of years, before humans were even human. Either we can accept the nonsense of establishment, or we ca ...
... in any way connected to the pseudoscientific theories accepted in astronomy today, but are real objects that can be experimented on and have firm foundations in observation for hundreds of thousands of years, before humans were even human. Either we can accept the nonsense of establishment, or we ca ...
5 log5 − = − d . N
... Orbital measurements of the binary system can give M, and thus R from the mass-radius relationship. If the disc can be resolved, Rd can be determined, thus allowing us to calculate m& from measurements of LAcc. Novae: Accretion transfers H on to the white dwarf. This mass ‘piles up’ on the surface, ...
... Orbital measurements of the binary system can give M, and thus R from the mass-radius relationship. If the disc can be resolved, Rd can be determined, thus allowing us to calculate m& from measurements of LAcc. Novae: Accretion transfers H on to the white dwarf. This mass ‘piles up’ on the surface, ...
White dwarf with almost pure oxygen atmosphere
... data generated by the New Mexico observatory. It was not until further tests were run that it was confirmed that the unique graph he had found turned out to represent data from the strange white dwarf. Though it is impossible at this point to say with any certainty what caused the unique star format ...
... data generated by the New Mexico observatory. It was not until further tests were run that it was confirmed that the unique graph he had found turned out to represent data from the strange white dwarf. Though it is impossible at this point to say with any certainty what caused the unique star format ...
Introduction to Astrophysics Tutorial 4: Supernovae
... A second channel for stellar explosions involves an accreting white dwarf. When it approached MCh (but before actually reaching it), its C is ignited. Because of the high degeneracy (i.e. pressure weakly depends on temperature), the fusion process is a runaway one, burning the entire white dwarf, an ...
... A second channel for stellar explosions involves an accreting white dwarf. When it approached MCh (but before actually reaching it), its C is ignited. Because of the high degeneracy (i.e. pressure weakly depends on temperature), the fusion process is a runaway one, burning the entire white dwarf, an ...
Stellar Remnants White Dwarfs, Neutron Stars & Black Holes
... White Dwarfs • composed mainly of Carbon & Oxygen • formed from stars that are no more than 8 Solar masses • White Dwarfs can be no more than 1.4 Solar masses and have diameters about the size of the Earth (1/100 the diameter of the Sun). • If a White Dwarf is in a binary system and close enough to ...
... White Dwarfs • composed mainly of Carbon & Oxygen • formed from stars that are no more than 8 Solar masses • White Dwarfs can be no more than 1.4 Solar masses and have diameters about the size of the Earth (1/100 the diameter of the Sun). • If a White Dwarf is in a binary system and close enough to ...
ppt - Slides by Prof Christian
... White Dwarfs < 1.4 Msun (Chandrasekar limit) Neutron Stars > 1.4 Msun < 3 Msun Black Holes > 3 Msun White Dwarfs - size of Earth (6000 km radius) Neutron Stars - size of small city (10 km radius) Black Holes - smaller* still than a city (< 10 km radius)! (* really depends on mass) ...
... White Dwarfs < 1.4 Msun (Chandrasekar limit) Neutron Stars > 1.4 Msun < 3 Msun Black Holes > 3 Msun White Dwarfs - size of Earth (6000 km radius) Neutron Stars - size of small city (10 km radius) Black Holes - smaller* still than a city (< 10 km radius)! (* really depends on mass) ...
Scientific Justification
... the observations with a theoretical model to determine the internal composition and structure. When a white dwarf gets cool enough, the C/O core eventually undergoes a phase transition from liquid to solid—it crystallizes, from the center outward. This is important because the crystallization proces ...
... the observations with a theoretical model to determine the internal composition and structure. When a white dwarf gets cool enough, the C/O core eventually undergoes a phase transition from liquid to solid—it crystallizes, from the center outward. This is important because the crystallization proces ...
29 October: Dead Stars 3
... PV=nRT. Pressure depends on both density and temperature • Extremely dense, “degenerate” gas PV=Kn. Pressure depends only on density • Demo ...
... PV=nRT. Pressure depends on both density and temperature • Extremely dense, “degenerate” gas PV=Kn. Pressure depends only on density • Demo ...
the free PDF resource
... usually yellow, white or blue depending on temperature (hotter = more blue) mass varies hugely usually orbited by planets sometimes exists in a pair (called binary system) almost entirely hydrogen. ...
... usually yellow, white or blue depending on temperature (hotter = more blue) mass varies hugely usually orbited by planets sometimes exists in a pair (called binary system) almost entirely hydrogen. ...
Stellar life after the Main Sequence (cont.)
... • Extremely dense, “degenerate” gas PV=Kn. Pressure depends only on density • Demo ...
... • Extremely dense, “degenerate” gas PV=Kn. Pressure depends only on density • Demo ...
Stars after the Main Sequence. Example: Betelgeuse (Alpha Orionis
... PV=nRT. Pressure depends on both density and temperature • Extremely dense, “degenerate” gas PV=Kn. Pressure depends only on density • Demo ...
... PV=nRT. Pressure depends on both density and temperature • Extremely dense, “degenerate” gas PV=Kn. Pressure depends only on density • Demo ...
Life Cycle of a Star
... of a supernova is 2X the size of sun, it shrinks to 20 km in size with the density of 1 tsp weighing 100 million metric tons!!!! ...
... of a supernova is 2X the size of sun, it shrinks to 20 km in size with the density of 1 tsp weighing 100 million metric tons!!!! ...
Ay123 Fall 2011 STELLAR STRUCTURE AND EVOLUTION Problem Set 2
... (3) Stein 2051, M = 0.50 M⊙ or 0.72 M⊙ , R = 0.0115 R⊙ , and try to infer their compositions. e. The results you have derived above should show that as M → 0, R → ∞. Clearly, at some point this result must break down (think about where Jupiter would fall on this plot !). This is because when the den ...
... (3) Stein 2051, M = 0.50 M⊙ or 0.72 M⊙ , R = 0.0115 R⊙ , and try to infer their compositions. e. The results you have derived above should show that as M → 0, R → ∞. Clearly, at some point this result must break down (think about where Jupiter would fall on this plot !). This is because when the den ...
White Dwarfs - Chandra X
... electrons are forced into higher energy states, not because they are hot, but because there is nowhere else to go. This creates a "degenerate" electron pressure (degenerate refers, not to the moral character of the electrons, but to the fact that all the low energy states are occupied). This pressur ...
... electrons are forced into higher energy states, not because they are hot, but because there is nowhere else to go. This creates a "degenerate" electron pressure (degenerate refers, not to the moral character of the electrons, but to the fact that all the low energy states are occupied). This pressur ...
Stellar Evolution
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
Stages 12 to 14
... The carbon rich core continues to contract and heat up. Carbon fusion requires a temperature of 500 to 600 million K. The core will contract until electron degeneracy pressure once again takes over, and contraction ends If the star is similar to the sun, the mass is too small, the ignition temperatu ...
... The carbon rich core continues to contract and heat up. Carbon fusion requires a temperature of 500 to 600 million K. The core will contract until electron degeneracy pressure once again takes over, and contraction ends If the star is similar to the sun, the mass is too small, the ignition temperatu ...
Stellar Evolution
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
More stellar evolution…bloated stars and compact cores
... What we see is the outside (photosphere) of the star. While this is going on in the core, the post-main sequence star moves around on the HertzsprungRussell diagram ...
... What we see is the outside (photosphere) of the star. While this is going on in the core, the post-main sequence star moves around on the HertzsprungRussell diagram ...