![H-R Diagram](http://s1.studyres.com/store/data/008995642_1-cfbab7cdcf5cc7a3cb833bfa4d8fac5c-300x300.png)
H-R Diagram
... A star’s energy comes from nuclear fusion, a process in which two hydrogen atoms join to form a helium atom. ...
... A star’s energy comes from nuclear fusion, a process in which two hydrogen atoms join to form a helium atom. ...
Chapter 11 Surveying the Stars How do we measure stellar
... 3. Orbital velocity (v) For circular orbits, v = 2πr / p ...
... 3. Orbital velocity (v) For circular orbits, v = 2πr / p ...
Slide 1
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
17_LectureOutline
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
Stars are classified by their TEMPERATURE (color) SPECTRAL
... wavelengths it emits, we would expect luminosity plotted against temperature to make a straight line… There should be a one-to-one correlation between luminosity and temperature ...
... wavelengths it emits, we would expect luminosity plotted against temperature to make a straight line… There should be a one-to-one correlation between luminosity and temperature ...
TEK 8 Test Review 1. List the three subatomic particles and give
... 1. List the three subatomic particles and give each of their masses. 2. Describe and draw an illustration (Bohr Model) of the most common element in the Universe. 3. Describe and draw an illustration (Bohr Model) of the second most common element in the ...
... 1. List the three subatomic particles and give each of their masses. 2. Describe and draw an illustration (Bohr Model) of the most common element in the Universe. 3. Describe and draw an illustration (Bohr Model) of the second most common element in the ...
Life and Death of a Star
... the internal temperature and pressure rise dramatically – The Core begins to push back against Gravity and the Protostar is formed – The core is NOT yet hot enough for Fusion – However the seed of a new star is planted ...
... the internal temperature and pressure rise dramatically – The Core begins to push back against Gravity and the Protostar is formed – The core is NOT yet hot enough for Fusion – However the seed of a new star is planted ...
charts_set_7
... Fragments then collapse on their own, fragmenting further. End product is 100’s or 1000’s of dense clumps each destined to form star, binary star, etc. Hence a cloud gives birth to a cluster of stars. ...
... Fragments then collapse on their own, fragmenting further. End product is 100’s or 1000’s of dense clumps each destined to form star, binary star, etc. Hence a cloud gives birth to a cluster of stars. ...
Chapter 11
... 12. According to Figure 11-5, the Protosun was cooler yet much more luminous than the Sun is now. How can this be true? a. The Protosun had more mass. b. The Protosun was much larger. c. The rate of nuclear fusion was higher inside the Protosun. d. Both a and c above. e. Both b and c above. ...
... 12. According to Figure 11-5, the Protosun was cooler yet much more luminous than the Sun is now. How can this be true? a. The Protosun had more mass. b. The Protosun was much larger. c. The rate of nuclear fusion was higher inside the Protosun. d. Both a and c above. e. Both b and c above. ...
Other Facets of Giant Branch Evolution • As the envelope cools due
... • As the envelope cools due to expansion, the opacity in the envelope increases (due to Kramers law), so by the time the star reaches the base of the giant branch (point 5), convection dominates energy transport. The thermal energy trapped by this opacity causes the star to further expand. (Note: th ...
... • As the envelope cools due to expansion, the opacity in the envelope increases (due to Kramers law), so by the time the star reaches the base of the giant branch (point 5), convection dominates energy transport. The thermal energy trapped by this opacity causes the star to further expand. (Note: th ...
The Life Cycles of Stars
... A star’s life cycle is determined by its mass. The larger the mass, the shorter the life cycle. A star’s mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust in which it is born. Over time, gravity pulls the hydrogen gas in the nebula together a ...
... A star’s life cycle is determined by its mass. The larger the mass, the shorter the life cycle. A star’s mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust in which it is born. Over time, gravity pulls the hydrogen gas in the nebula together a ...
The Life Cycles of Stars, Part II
... A star’s life cycle is determined by its mass. The larger the mass, the shorter the life cycle. A star’s mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust in which it is born. Over time, gravity pulls the hydrogen gas in the nebula together a ...
... A star’s life cycle is determined by its mass. The larger the mass, the shorter the life cycle. A star’s mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust in which it is born. Over time, gravity pulls the hydrogen gas in the nebula together a ...
G W ORIONIS, A 20000 YEARS OLD T TAURI STAR? 1\/"", _ 0.14
... Our knowledge 01' the actual ages 01' very young stars is very meager; the first indication Lhat we may be observing stars with ages 01' the onler 01' 10 000 years came indirectly from the analysis 01' the density distribution in the Orion nebula (Kahn am! Menon ]9(1) which showed that the latter co ...
... Our knowledge 01' the actual ages 01' very young stars is very meager; the first indication Lhat we may be observing stars with ages 01' the onler 01' 10 000 years came indirectly from the analysis 01' the density distribution in the Orion nebula (Kahn am! Menon ]9(1) which showed that the latter co ...
Star - Astrophysics
... For a cloud or star contracting in a quasi-equilibrium state 2Ethermal = −Ugrav, an example of the Virial Theorem. Thus, as noted above, as a star contracts half of the change in the gravitational potential U goes into increasing the thermal energy (i.e. the temperature) and (at least) the other ha ...
... For a cloud or star contracting in a quasi-equilibrium state 2Ethermal = −Ugrav, an example of the Virial Theorem. Thus, as noted above, as a star contracts half of the change in the gravitational potential U goes into increasing the thermal energy (i.e. the temperature) and (at least) the other ha ...
Luminosity
... 1. Some stars are larger than others and therefore appear larger. 2. Some stars are nearer than others and therefore appear larger. 3. Both (1) and (2). 4. Photographs make brighter stars appear larger than fainter stars, although they should all be points of light. ...
... 1. Some stars are larger than others and therefore appear larger. 2. Some stars are nearer than others and therefore appear larger. 3. Both (1) and (2). 4. Photographs make brighter stars appear larger than fainter stars, although they should all be points of light. ...
Summary: The Structure and Evolution of Stars
... In this particular cluster, the turnoff luminosity is around 1 L⊙ , and hence a rough estimate of the age would be 1010 yr (i.e. the same as the main-sequence lifetime of a 1 M⊙ star). Note that this estimate ignores metallicity effects (lower-metallicity stars have higher luminosity and shorter mai ...
... In this particular cluster, the turnoff luminosity is around 1 L⊙ , and hence a rough estimate of the age would be 1010 yr (i.e. the same as the main-sequence lifetime of a 1 M⊙ star). Note that this estimate ignores metallicity effects (lower-metallicity stars have higher luminosity and shorter mai ...
Lecture 26 Pre-Main Sequence Evolution
... • Optical detection of young stars or pre-main-sequence stars (YSOs) by AH Joy (ApJ 102 168 1945) – The class of T Tauri stars was defined after the prototype T Tau • Irregular variability by as much as 3 magnitudes • Spectral types F5 to G5, with strong Ca II H & K emission lines as well as H Balme ...
... • Optical detection of young stars or pre-main-sequence stars (YSOs) by AH Joy (ApJ 102 168 1945) – The class of T Tauri stars was defined after the prototype T Tau • Irregular variability by as much as 3 magnitudes • Spectral types F5 to G5, with strong Ca II H & K emission lines as well as H Balme ...
L3 - QUB Astrophysics Research Centre
... Why, in principle, do you think there needs to be a minimum value ? given what we know, what is this likely to depend upon ? ...
... Why, in principle, do you think there needs to be a minimum value ? given what we know, what is this likely to depend upon ? ...
script
... • therefore, stellar wind takes away angular momentum and the stellar rotation is braked ...
... • therefore, stellar wind takes away angular momentum and the stellar rotation is braked ...
What Is a Star
... Stars are not alone in space. Stars are found in clusters (groups) called galaxies. Our sun is just one of billions of stars in the Milky Way Galaxy. There are many billions of galaxies in space. How many stars are there? Scientists think that there are about three hundred sextillion stars in space! ...
... Stars are not alone in space. Stars are found in clusters (groups) called galaxies. Our sun is just one of billions of stars in the Milky Way Galaxy. There are many billions of galaxies in space. How many stars are there? Scientists think that there are about three hundred sextillion stars in space! ...
Star Life Cycle Web Activity
... (The bigger the star is the ________________ it is because _________________) ...
... (The bigger the star is the ________________ it is because _________________) ...
Sample Final
... 28. Which of the following best describes the Big Bang Theory? a) The Universe is eternal, infinite in size, and static. b) As the Universe expands, matter is continuously created to keep the average density constant. c) The Universe arose at the same time as the Earth and is about 6000 years old. d ...
... 28. Which of the following best describes the Big Bang Theory? a) The Universe is eternal, infinite in size, and static. b) As the Universe expands, matter is continuously created to keep the average density constant. c) The Universe arose at the same time as the Earth and is about 6000 years old. d ...
Today`s Powerpoint
... Pattern of absorption lines depends on temperature (mainly) and chemical composition. Spectra give most accurate info on these as well as: density in atmosphere gravity at surface velocity of star towards or from us ...
... Pattern of absorption lines depends on temperature (mainly) and chemical composition. Spectra give most accurate info on these as well as: density in atmosphere gravity at surface velocity of star towards or from us ...
The Universe - Solon City Schools
... The spectral lines can indicate the composition of a star. ...
... The spectral lines can indicate the composition of a star. ...
Project 4: The HR diagram. Open clusters
... luminosity stars. These are the main sequence stars. Our Sun is one of them. There are a few stars that are not in this diagonal strip. There are some low temperature, high luminosity stars - these are called giants and supergiants. The reason they are so ...
... luminosity stars. These are the main sequence stars. Our Sun is one of them. There are a few stars that are not in this diagonal strip. There are some low temperature, high luminosity stars - these are called giants and supergiants. The reason they are so ...