Low Mass
... • As stars burn H to He, He builds up in the core. • Stars begin to “die” when they run out of hydrogen in their core. • No hydrogen fusion in core • Core collapses because there is no longer balance between gravity and outward pressure (no more hydrostatic equilibrium) ...
... • As stars burn H to He, He builds up in the core. • Stars begin to “die” when they run out of hydrogen in their core. • No hydrogen fusion in core • Core collapses because there is no longer balance between gravity and outward pressure (no more hydrostatic equilibrium) ...
Motions of the Sky—2 Sep Hipparchus measures the moon’s distance~200BC
... 2. How do you explain day and night using the celestial sphere? 3. How do you explain seasonal changes in the sky? ...
... 2. How do you explain day and night using the celestial sphere? 3. How do you explain seasonal changes in the sky? ...
How Bright is that star?
... The luminosity of a star depends on two things The surface area (A) of the Star… bigger stars are brighter because there is more area to shine. And The luminosity (l ) of a square meter of surface area. L = Al ...
... The luminosity of a star depends on two things The surface area (A) of the Star… bigger stars are brighter because there is more area to shine. And The luminosity (l ) of a square meter of surface area. L = Al ...
Astronomy 12: Introduction to Astronomy
... type of star, size of star, and the star’s stage of evolution. d. It plots a star’s size and surface temperature, which allows astronomers determine its region of origin 2. What is the Main Sequence? a. The evolutionary path, as seen on the H-R diagram, that a star follows throughout its life. b. Th ...
... type of star, size of star, and the star’s stage of evolution. d. It plots a star’s size and surface temperature, which allows astronomers determine its region of origin 2. What is the Main Sequence? a. The evolutionary path, as seen on the H-R diagram, that a star follows throughout its life. b. Th ...
Lecture7 - Indiana University Astronomy
... by characteristics of the “matter” and the wavelength of light. ...
... by characteristics of the “matter” and the wavelength of light. ...
Stars and Their Characteristics
... Remnants of Massive Stars • neutron star-dense mass of neutrons formed through gravity • pulsar- a distant neutron star that emits rapid pulses of light and radio waves instead of steady radiation • black hole- remnant of a star at least 15 times as massive than the sun – gravitational force is so s ...
... Remnants of Massive Stars • neutron star-dense mass of neutrons formed through gravity • pulsar- a distant neutron star that emits rapid pulses of light and radio waves instead of steady radiation • black hole- remnant of a star at least 15 times as massive than the sun – gravitational force is so s ...
Wednesday, November 7, 2007
... shorter its life span. • Reason: although massive stars have a larger fuel supply than less massive stars, they consume their fuel ...
... shorter its life span. • Reason: although massive stars have a larger fuel supply than less massive stars, they consume their fuel ...
Document
... j. How is it possible that Canopus is more luminous than Achernar, given their respective spectral types? Canopus is cooler than Achernar; therefore, the only way Canopus can be more luminous is because it is LARGER. 2. List the evolutionary stages of the Sun’s life cycle & describe how its size (Ra ...
... j. How is it possible that Canopus is more luminous than Achernar, given their respective spectral types? Canopus is cooler than Achernar; therefore, the only way Canopus can be more luminous is because it is LARGER. 2. List the evolutionary stages of the Sun’s life cycle & describe how its size (Ra ...
Powerpoint Presentation (large file)
... 1. What kinds of nuclear reactions occur within a star like the Sun as it ages? 2. Where did the carbon atoms in our bodies come from? 3. What is a planetary nebula, and what does it have to do with planets? 4. What is a white dwarf star? 5. Why do high-mass stars go through more evolutionary stages ...
... 1. What kinds of nuclear reactions occur within a star like the Sun as it ages? 2. Where did the carbon atoms in our bodies come from? 3. What is a planetary nebula, and what does it have to do with planets? 4. What is a white dwarf star? 5. Why do high-mass stars go through more evolutionary stages ...
Electromagnetic Spectrum
... star passes through it, removing these waves of color from the continuous spectrum of the star. This occurs as the light of the star passes through the Photosphere and different stars may have different elements present in their Photosphere. The dark lines that show up in a spectrum of a star are c ...
... star passes through it, removing these waves of color from the continuous spectrum of the star. This occurs as the light of the star passes through the Photosphere and different stars may have different elements present in their Photosphere. The dark lines that show up in a spectrum of a star are c ...
PS #1 Solutions - Stars and Stellar Explosions 1. Opacity sources
... b) If all stars have roughly the same central temperature (that of the sun), use a scaling argument to estimate the stellar mass at which the simple non-interacting ideal gas assumption breaks down. SOLUTION: (a) An ideal gas is one in which the particles are far apart from one another, and one in w ...
... b) If all stars have roughly the same central temperature (that of the sun), use a scaling argument to estimate the stellar mass at which the simple non-interacting ideal gas assumption breaks down. SOLUTION: (a) An ideal gas is one in which the particles are far apart from one another, and one in w ...