Chapter 19 Star Formation
... Clouds contract in a “distorted” way: In fact the clouds are usually much more irregular than shown in this textbook illustration. (Note: all the colorful emission line nebulae shown in this chapter are just this same molecular gas after a massive stars has started pouring out photons. ...
... Clouds contract in a “distorted” way: In fact the clouds are usually much more irregular than shown in this textbook illustration. (Note: all the colorful emission line nebulae shown in this chapter are just this same molecular gas after a massive stars has started pouring out photons. ...
Sun, Moon, Earth,
... – Stars that are close to them are “pulled” by the gravity of the black hole. – Gases in the area are pulled in so fast (like a drain in a sink) that they spin around the black hole and we see the heat given off. ...
... – Stars that are close to them are “pulled” by the gravity of the black hole. – Gases in the area are pulled in so fast (like a drain in a sink) that they spin around the black hole and we see the heat given off. ...
chapter8
... intrinsic brightness or luminosity (L) and inversely proportional to the square of the distance (d): L ...
... intrinsic brightness or luminosity (L) and inversely proportional to the square of the distance (d): L ...
script
... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
Chapter 19 Star Formation
... “distorted way: In fact the clouds are usually much more irregular than shown in this textbook illustration. (Note: all the colorful emission line nebulae shown in this chapter are just this same molecular gas after a massive stars has started pouring out photons. ...
... “distorted way: In fact the clouds are usually much more irregular than shown in this textbook illustration. (Note: all the colorful emission line nebulae shown in this chapter are just this same molecular gas after a massive stars has started pouring out photons. ...
Stars
... A dim star that is close to earth can appear brighter than a more distant star that is actually very bright. A few thousand stars look bright enough for us to see without a telescope. These bright stars may give off more light than other stars, or they may just be closer to Earth. ...
... A dim star that is close to earth can appear brighter than a more distant star that is actually very bright. A few thousand stars look bright enough for us to see without a telescope. These bright stars may give off more light than other stars, or they may just be closer to Earth. ...
April 10th
... • Most white dwarfs are composed of carbon and oxygen • Some white dwarfs have the same mass as the Sun but slightly bigger than the Earth • 200,000 times as dense as the Earth • Very dense – Some have densities of 3 million grams per cubic centimeter – A teaspoon of a white dwarf would weigh as muc ...
... • Most white dwarfs are composed of carbon and oxygen • Some white dwarfs have the same mass as the Sun but slightly bigger than the Earth • 200,000 times as dense as the Earth • Very dense – Some have densities of 3 million grams per cubic centimeter – A teaspoon of a white dwarf would weigh as muc ...
Solutions to Homework #4, AST 203, Spring 2012
... Hint: the Earth is still very far from this planetary system. Solution We are observing this transit from very far away, so the distance between the planet and the host star will not affect the answer. The difference is just the cross sectional area of the planet. Jupiter’s radius is 11 times the Ea ...
... Hint: the Earth is still very far from this planetary system. Solution We are observing this transit from very far away, so the distance between the planet and the host star will not affect the answer. The difference is just the cross sectional area of the planet. Jupiter’s radius is 11 times the Ea ...
Astronomy Assignment #1
... because it was the same temperature as the Sun, by quite a bit more luminous. What this problem is trying to illustrate, is the luminosity depends on the square of the stellar radius, not just on the radius alone. ...
... because it was the same temperature as the Sun, by quite a bit more luminous. What this problem is trying to illustrate, is the luminosity depends on the square of the stellar radius, not just on the radius alone. ...
Extension worksheet – Topic 6 - Cambridge Resources for the IB
... Mark scheme for Extension Worksheet – Option E, Worksheet 1 ...
... Mark scheme for Extension Worksheet – Option E, Worksheet 1 ...
Variable Stars: Pulsation, Evolution and applications to Cosmology
... Recall equations of stellar structure. Nuclear energy generation rate ε(ρ,T) slowly changes the composition decreasing the amount of Hydrogen and increasing the amount of Helium on a nuclear time scale – the characteristic time for stellar properties to change as a result of nuclear burning: tnuc ~ ...
... Recall equations of stellar structure. Nuclear energy generation rate ε(ρ,T) slowly changes the composition decreasing the amount of Hydrogen and increasing the amount of Helium on a nuclear time scale – the characteristic time for stellar properties to change as a result of nuclear burning: tnuc ~ ...
Astronomy
... a. Star A does not appear as bright as star B. b. The intensity ratio between star A and star B is 2.512. c. Light output and distance cannot be determined from a star's apparent visual magnitude alone. d. All of the above ...
... a. Star A does not appear as bright as star B. b. The intensity ratio between star A and star B is 2.512. c. Light output and distance cannot be determined from a star's apparent visual magnitude alone. d. All of the above ...
Lecture 11, PPT version
... your line of sight, there is no Doppler shift and you see the “zero velocity” line pattern. The curved magenta line above shows you how one particular black absorption line sweeps up and down the spectrum due to orbital motion. ...
... your line of sight, there is no Doppler shift and you see the “zero velocity” line pattern. The curved magenta line above shows you how one particular black absorption line sweeps up and down the spectrum due to orbital motion. ...
Document
... Aquarii is an example of this class. Amplitudes and light-curve shapes generally vary and periods are in the range of 35–1200 days.. • * SRB: Spectral-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of pe ...
... Aquarii is an example of this class. Amplitudes and light-curve shapes generally vary and periods are in the range of 35–1200 days.. • * SRB: Spectral-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of pe ...
White dwarfs
... -Temperature of Sirius B (“white”) : Teff = 8 000 K (Adams, 1914) It leads R = 18 000 km, ρ = 7 104 g/cm3 (Moderne values : Teff = 24 000 K , R = 2000 km , ρ = 6 107 g/cm3 ) - Eddington 1926 : “we have a star of a mass about equal to the sun and a radius much less than Uranus [...] it seems likely t ...
... -Temperature of Sirius B (“white”) : Teff = 8 000 K (Adams, 1914) It leads R = 18 000 km, ρ = 7 104 g/cm3 (Moderne values : Teff = 24 000 K , R = 2000 km , ρ = 6 107 g/cm3 ) - Eddington 1926 : “we have a star of a mass about equal to the sun and a radius much less than Uranus [...] it seems likely t ...
What The Star of Bethlehem Was Not
... Venus is a glorious sight when it is high in the sky after dark and, because of this, it is an unlikely Star of Bethlehem. We are as certain as we can be of anything that the Magi were assiduous watchers of the sky and would certainly have known Venus and recognised it for what it is. Similarly, apa ...
... Venus is a glorious sight when it is high in the sky after dark and, because of this, it is an unlikely Star of Bethlehem. We are as certain as we can be of anything that the Magi were assiduous watchers of the sky and would certainly have known Venus and recognised it for what it is. Similarly, apa ...