Ourdraft
... distant galaxy? It’s important to remember that you can’t perceive depth in space; everything is so far away that every object looks like a point source, a tiny dot of light. And it could be a certain magnitude (brightness) because it is really far away but very bright, or not so bright but very clo ...
... distant galaxy? It’s important to remember that you can’t perceive depth in space; everything is so far away that every object looks like a point source, a tiny dot of light. And it could be a certain magnitude (brightness) because it is really far away but very bright, or not so bright but very clo ...
What is a Star
... If brightness and surface temperature are considered, stars can be plotted on a graph called the Hertzsprung-Russell Diagram, a graph of great utility for the understanding of the life cycle of the stars. Birth of a star Stellar evolution begins with the gravitational collapse of part of a nebula cl ...
... If brightness and surface temperature are considered, stars can be plotted on a graph called the Hertzsprung-Russell Diagram, a graph of great utility for the understanding of the life cycle of the stars. Birth of a star Stellar evolution begins with the gravitational collapse of part of a nebula cl ...
PHYSICS 015
... The ‘Cooling Track’ The prominent sequence to the right is the main sequence. All the brighter hotter stars (to the upper left) have evolved away; the bright red giants lie to the upper right of this figure, off the plot. The star shown in yellow has been there for billions of years, essentially un ...
... The ‘Cooling Track’ The prominent sequence to the right is the main sequence. All the brighter hotter stars (to the upper left) have evolved away; the bright red giants lie to the upper right of this figure, off the plot. The star shown in yellow has been there for billions of years, essentially un ...
Supernovae, Neutron Stars, Black Holes
... might have triggered the collapse of the huge interstellar cloud in which the Sun formed. ...
... might have triggered the collapse of the huge interstellar cloud in which the Sun formed. ...
Life Cycle of Stars
... 3. Eventually, the particles of that the gas and the dust are made of are brought so close together that they start to stick together, they start to fuse and that is the energy source of a star. 4. The star then switches on and begins to shine. 5. Inside every newborn star, hydrogen atoms are fused ...
... 3. Eventually, the particles of that the gas and the dust are made of are brought so close together that they start to stick together, they start to fuse and that is the energy source of a star. 4. The star then switches on and begins to shine. 5. Inside every newborn star, hydrogen atoms are fused ...
Lecture 11
... They start to burn and release energy. Pressure rises and temperature rise, but volume does not increase. P and T rise some more. Finally, P gets so great it lifts the degeneracy and thermal pressure equilibrium is re-established. This is the “He Flash” Could blow a star apart, but it doesn’t. ...
... They start to burn and release energy. Pressure rises and temperature rise, but volume does not increase. P and T rise some more. Finally, P gets so great it lifts the degeneracy and thermal pressure equilibrium is re-established. This is the “He Flash” Could blow a star apart, but it doesn’t. ...
The Sunspot Cycle
... • Sunspots are a detail showing how the Sun’s magnetic field is leaking out of the zones just below the Sun’s surface. • Magnetic field produced in outer 30% of Sun’s radius. ...
... • Sunspots are a detail showing how the Sun’s magnetic field is leaking out of the zones just below the Sun’s surface. • Magnetic field produced in outer 30% of Sun’s radius. ...
DYNAMICAL STABILITY OF SPHERICAL STARS
... If σ 2 < 0 then the motion is oscillatory, i.e. the star is dynamically stable. If σ 2 > 0 than there is a solution that increases exponentially, i.e. the star is dynamically unstable. Therefore, the star is dynamically unstable if γ < 4/3. We obtained this result in a crude way. The proper analysis ...
... If σ 2 < 0 then the motion is oscillatory, i.e. the star is dynamically stable. If σ 2 > 0 than there is a solution that increases exponentially, i.e. the star is dynamically unstable. Therefore, the star is dynamically unstable if γ < 4/3. We obtained this result in a crude way. The proper analysis ...
Lecture4
... The HR (Hertzsprung-Russell) Diagram (1913) Notice that a 100 solar mass star is about a million times brighter than the Sun. It has 100 times more fuel but uses it up a million times faster. It therefore lives only about 10-4 times as long as the Sun. Since the Sun lives 10 billion years, a 100 so ...
... The HR (Hertzsprung-Russell) Diagram (1913) Notice that a 100 solar mass star is about a million times brighter than the Sun. It has 100 times more fuel but uses it up a million times faster. It therefore lives only about 10-4 times as long as the Sun. Since the Sun lives 10 billion years, a 100 so ...
1000
... star and you notice that the star you are watching has moved about 15 degrees, how long have you been watching? ...
... star and you notice that the star you are watching has moved about 15 degrees, how long have you been watching? ...
3 - MrFuglestad
... of fuel is used up. The star expands and then pressure in the core “ignites” the next element in the succession of fusion from Hydrogen to Iron. Stars that end up with mass less than 1.5 times our Sun’s mass White Dwarf – Earth sized star that is stable with no nuclear reactions and is made of heliu ...
... of fuel is used up. The star expands and then pressure in the core “ignites” the next element in the succession of fusion from Hydrogen to Iron. Stars that end up with mass less than 1.5 times our Sun’s mass White Dwarf – Earth sized star that is stable with no nuclear reactions and is made of heliu ...
Today`s Powerpoint
... Further subdivision: BO - B9, GO - G9, etc. GO hotter than G9. Sun is a G2. ...
... Further subdivision: BO - B9, GO - G9, etc. GO hotter than G9. Sun is a G2. ...
2nd Semester Exam Study Guide
... 7. After the Big Bang occurred, many atoms of hydrogen and helium formed when temperatures decreased and gravitational attractions lead to the formation of trillions of stars. 8. The peak wavelength for objects depends on the intensity of light given off at a certain point. Blue stars produce more e ...
... 7. After the Big Bang occurred, many atoms of hydrogen and helium formed when temperatures decreased and gravitational attractions lead to the formation of trillions of stars. 8. The peak wavelength for objects depends on the intensity of light given off at a certain point. Blue stars produce more e ...
Quiz # 2
... Bonus. The spectrum of a star shows an equivalent set of dark absorption lines to those of the Sun, but with one exception. Every line appears at a slightly longer wavelength, shifted toward the red end of the spectrum. What conclusion can be drawn from this observation? A) A cloud of cold gas and ...
... Bonus. The spectrum of a star shows an equivalent set of dark absorption lines to those of the Sun, but with one exception. Every line appears at a slightly longer wavelength, shifted toward the red end of the spectrum. What conclusion can be drawn from this observation? A) A cloud of cold gas and ...