Lecture 24, The local group
... Why do most of the subhalos not have stars but some do? One possibility is that about 10% of halos that are small now (Vc < 30 km/s) were much larger at z > 2, but suffer tidal stripping in the hierarchical merging process. The MW dSph formed in such objects with M > 109 M , so were able to bu ...
... Why do most of the subhalos not have stars but some do? One possibility is that about 10% of halos that are small now (Vc < 30 km/s) were much larger at z > 2, but suffer tidal stripping in the hierarchical merging process. The MW dSph formed in such objects with M > 109 M , so were able to bu ...
FIRST DETECTION OF KRYPTON AND XENON IN A WHITE DWARF
... serious problem for the NLTE calculations. f values are unknown for 895 of the 1035 included line transitions. They were set to 10−4 within in a spin system and to 10−6 otherwise. It was found, however, that the resulting UV line profiles do not change when we completely omit them. In order to estim ...
... serious problem for the NLTE calculations. f values are unknown for 895 of the 1035 included line transitions. They were set to 10−4 within in a spin system and to 10−6 otherwise. It was found, however, that the resulting UV line profiles do not change when we completely omit them. In order to estim ...
DOC - Cool Cosmos
... The way stars live and die makes a lot of sense if you consider what a star really is. Simply put, a star is a large amount of gas and dust that is collapsing under the force of gravity. At first, this crush of gravity makes the inside of the star hot enough to ignite a nuclear explosion. This explo ...
... The way stars live and die makes a lot of sense if you consider what a star really is. Simply put, a star is a large amount of gas and dust that is collapsing under the force of gravity. At first, this crush of gravity makes the inside of the star hot enough to ignite a nuclear explosion. This explo ...
8.1 Stars
... fusion. Some of the fragments are sent far out into space while other debris may be made into new nebulae. The star’s remaining core after a supernova explosion faces one of two outcomes, depending on the mass of the original star: ...
... fusion. Some of the fragments are sent far out into space while other debris may be made into new nebulae. The star’s remaining core after a supernova explosion faces one of two outcomes, depending on the mass of the original star: ...
Unit 2: The Sun and Other Stars
... heavier elements, like gold and uranium. These bright outer layers are ejected by the star (which we call a supernova). While scientists still don’t completely understand the process, the collision of neutron stars and supernova explosions appear to be the “creators” of the heavier elements. ...
... heavier elements, like gold and uranium. These bright outer layers are ejected by the star (which we call a supernova). While scientists still don’t completely understand the process, the collision of neutron stars and supernova explosions appear to be the “creators” of the heavier elements. ...
Leo the Lion - Discovery Education
... Leo the Lion You can look at a calendar to check when spring will come. However, 2,000 years ago, people looked at the sky to check if spring was coming. They looked to the stars. A star is a huge, hot, bright ball of gases. These people were looking for a particular group of stars. Stars can be gro ...
... Leo the Lion You can look at a calendar to check when spring will come. However, 2,000 years ago, people looked at the sky to check if spring was coming. They looked to the stars. A star is a huge, hot, bright ball of gases. These people were looking for a particular group of stars. Stars can be gro ...
Gravity simplest fusion
... • They are approximately 10-15 km in diameter and weigh about 1.4 times the mass of the Sun – Due to the combination of small size and tremendous mass, their force of gravity is about 300,000 times that of Earth. ...
... • They are approximately 10-15 km in diameter and weigh about 1.4 times the mass of the Sun – Due to the combination of small size and tremendous mass, their force of gravity is about 300,000 times that of Earth. ...
Star
... Mini Black Holes can Evaporate Mini BH produce strong tides (stellar BH don’t have strong enough tides) Lose energy by work of tidal gravity on material outside the event horizon Since energy = mass, they lose mass and get smaller Evaporate ...
... Mini Black Holes can Evaporate Mini BH produce strong tides (stellar BH don’t have strong enough tides) Lose energy by work of tidal gravity on material outside the event horizon Since energy = mass, they lose mass and get smaller Evaporate ...
Recap: High Mass Stars
... • The outer layers of the sun will expand, consuming the inner planets • Sun will become a Red Giant ...
... • The outer layers of the sun will expand, consuming the inner planets • Sun will become a Red Giant ...
distmeasures
... units of distance you use everyday can be unwieldy when describing the distances to celestial objects. You will not become familiar with some common astronomical distances measures. In the solar system, it is convenient to use the average distance between the Earth and the Sun as a unit of distance. ...
... units of distance you use everyday can be unwieldy when describing the distances to celestial objects. You will not become familiar with some common astronomical distances measures. In the solar system, it is convenient to use the average distance between the Earth and the Sun as a unit of distance. ...
DISTANCE MEASURES EXERCISE The goal of this exercise is to
... units of distance you use everyday can be unwieldy when describing the distances to celestial objects. You will not become familiar with some common astronomical distances measures. In the solar system, it is convenient to use the average distance between the Earth and the Sun as a unit of distance. ...
... units of distance you use everyday can be unwieldy when describing the distances to celestial objects. You will not become familiar with some common astronomical distances measures. In the solar system, it is convenient to use the average distance between the Earth and the Sun as a unit of distance. ...
MIDTERM #1 AST209 - The Cosmos Feb 10, 2012 50 minutes
... C) Stellar parallax was first observed by ancient Greek astronomers. D) The amount of parallax we see depends on how fast a star is moving relative to us. E) We observe all stars to exhibit at least a slight amount of parallax. 16. If an astronaut landed on a planet of the same radius as the Earth b ...
... C) Stellar parallax was first observed by ancient Greek astronomers. D) The amount of parallax we see depends on how fast a star is moving relative to us. E) We observe all stars to exhibit at least a slight amount of parallax. 16. If an astronaut landed on a planet of the same radius as the Earth b ...
Free-electron lasers
... Motivation: Photo-synthesis converts light from the sun very effective into chemical energy that triggers the conversion of CO2 to O2. If Photo-synthesis would be fully understood then it could be maybe used as an alternative source of energy. The involved proteins have been studied in synchrotron l ...
... Motivation: Photo-synthesis converts light from the sun very effective into chemical energy that triggers the conversion of CO2 to O2. If Photo-synthesis would be fully understood then it could be maybe used as an alternative source of energy. The involved proteins have been studied in synchrotron l ...
B – V
... Atmospheric extinction (e.g. Rayleigh scattering) will affect the A star more than the K star because it has more flux at shorter wavelength where the extinction is greater ...
... Atmospheric extinction (e.g. Rayleigh scattering) will affect the A star more than the K star because it has more flux at shorter wavelength where the extinction is greater ...
STA Binary star model
... Two stars orbiting each other so that the stars pass in front of each other when viewed from the earth are called eclipsing binary stars. You are going to use the model of an eclipsing binary star to see how to calculate the mass of a star in an eclipsing binary system. Apparatus: Binary star model ...
... Two stars orbiting each other so that the stars pass in front of each other when viewed from the earth are called eclipsing binary stars. You are going to use the model of an eclipsing binary star to see how to calculate the mass of a star in an eclipsing binary system. Apparatus: Binary star model ...
Branches of Astronomy
... Universe. These instruments have allowed us to create a picture of our universe that spans the entire electromagnetic spectrum, from low energy radio signals, to ultra high energy gamma-rays. They give us information about the evolution and physics of some of the Universe’s most dynamic treasures, s ...
... Universe. These instruments have allowed us to create a picture of our universe that spans the entire electromagnetic spectrum, from low energy radio signals, to ultra high energy gamma-rays. They give us information about the evolution and physics of some of the Universe’s most dynamic treasures, s ...
The Sun is a mass of Incandescent Gas
... The Sun and other stars are really only roughly in equilibrium. The Sun is extremely dynamic, and has storms larger than the Earth. ...
... The Sun and other stars are really only roughly in equilibrium. The Sun is extremely dynamic, and has storms larger than the Earth. ...
Supernova
... • Sun-like stars (M< 9 Msolar) stop producing energy with Shell Helium Burning and leave behind a carbon core (White Dwarf). • Stars more massive continue to fuse heavier elements in their cores as they evolve. Carbon burning at 600 Million K Neon burning at 1.2 Billion K Oxygen Burning at 1.5 Billi ...
... • Sun-like stars (M< 9 Msolar) stop producing energy with Shell Helium Burning and leave behind a carbon core (White Dwarf). • Stars more massive continue to fuse heavier elements in their cores as they evolve. Carbon burning at 600 Million K Neon burning at 1.2 Billion K Oxygen Burning at 1.5 Billi ...
exam1guide - Chemistry at Winthrop University
... in old stars, star death for small and large stars, supernova and production of heavy elements, kilonovas, stars as agents of change in the universe. The Solar System: Earth’s Sun (Sol), hydrogen fusion, yellow star (surface temperature=6,000o C), Sol’s electromagnetic radiation, structure of Sol, r ...
... in old stars, star death for small and large stars, supernova and production of heavy elements, kilonovas, stars as agents of change in the universe. The Solar System: Earth’s Sun (Sol), hydrogen fusion, yellow star (surface temperature=6,000o C), Sol’s electromagnetic radiation, structure of Sol, r ...
Waves
... is the period of time during which earth completes a single revolution around the sun, consisting of 365 days, 5 hours, 49 minutes, and 12 seconds of mean solar ...
... is the period of time during which earth completes a single revolution around the sun, consisting of 365 days, 5 hours, 49 minutes, and 12 seconds of mean solar ...
Goal: To understand the HR diagram
... • At different temperatures, the blackbody spectrum peaks out at a different part of the spectrum. • Hot stars peak in the blue – so they appear to be blue. • Moderate stars peak in the middle, so appear to be yellow to white. • Cooler stars peak in the red, so appear to be orange to red. ...
... • At different temperatures, the blackbody spectrum peaks out at a different part of the spectrum. • Hot stars peak in the blue – so they appear to be blue. • Moderate stars peak in the middle, so appear to be yellow to white. • Cooler stars peak in the red, so appear to be orange to red. ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.