3 The lives of galaxies
... know in fact that dark matter can be any kind of ordinary matter. In later lectures we will see that Helium and other elements are made during the Big Bang by nuclear fusion; the amount made depends on the density of the Universe. The density of dark matter that we see implies that much more heavy e ...
... know in fact that dark matter can be any kind of ordinary matter. In later lectures we will see that Helium and other elements are made during the Big Bang by nuclear fusion; the amount made depends on the density of the Universe. The density of dark matter that we see implies that much more heavy e ...
Energy production in stars
... Be and B, as well as with deuterons, are all very fast at the central temperature of the sun, but just this speed of the reaction rules them out: the partner of H is very quickly used up in the process. In fact, and just because of this reason, all the elements mentioned, from deuterium to boron, ar ...
... Be and B, as well as with deuterons, are all very fast at the central temperature of the sun, but just this speed of the reaction rules them out: the partner of H is very quickly used up in the process. In fact, and just because of this reason, all the elements mentioned, from deuterium to boron, ar ...
MIDTERM #1 AST209 - The Cosmos Feb 10, 2012 50 minutes
... C) They will not speed up at all, but move at a constant speed because they are in space and the rocket has nothing against which to push. D) It is impossible to say with only the information provided E) The one with the higher mass. 29. Why is it summer in the Northern Hemisphere when it is winter ...
... C) They will not speed up at all, but move at a constant speed because they are in space and the rocket has nothing against which to push. D) It is impossible to say with only the information provided E) The one with the higher mass. 29. Why is it summer in the Northern Hemisphere when it is winter ...
Document
... ● AO imaging and IR spectroscopy of thousands of disks around nearby young stars diversity of disk systems ● characterize physics of disks T(r), ρ(r) ● detect giant planets directly ● detect giant planets indirectly from gravitational “gaps” in disks ● characterize planets from properties of disk ...
... ● AO imaging and IR spectroscopy of thousands of disks around nearby young stars diversity of disk systems ● characterize physics of disks T(r), ρ(r) ● detect giant planets directly ● detect giant planets indirectly from gravitational “gaps” in disks ● characterize planets from properties of disk ...
Habitable Zones around Evolved Stars
... Factors determining the location of the habitable zone in evolved stars • L changes dramatically as a star evolves beyond the main sequence • ap is altered by changing M* or in extreme cases by tidal or gas drag • The albedoratio depends on planetary atmosphere, surface properties, => and the stell ...
... Factors determining the location of the habitable zone in evolved stars • L changes dramatically as a star evolves beyond the main sequence • ap is altered by changing M* or in extreme cases by tidal or gas drag • The albedoratio depends on planetary atmosphere, surface properties, => and the stell ...
Introduction to Astronomy and the Celestial Sphere
... resemble the object for which they were named instead, they were named to honor a figure from mythology which was important to the ancients. ...
... resemble the object for which they were named instead, they were named to honor a figure from mythology which was important to the ancients. ...
Are Gamma-Ray Bursts good Star Formation Indicators?
... Current samples of GRBs are too small and incomplete, especially in terms of redshifts, to make firm statements about global star formation. However, if GRBs are unbiased tracers of star formation then samples of their hosts should contain populations of galaxies in proportion to the contribution of ...
... Current samples of GRBs are too small and incomplete, especially in terms of redshifts, to make firm statements about global star formation. However, if GRBs are unbiased tracers of star formation then samples of their hosts should contain populations of galaxies in proportion to the contribution of ...
Optical studies of an ultraluminous X-ray source: NGC1313 X-2 Jifeng Liu
... X-ray observations: light curves ...
... X-ray observations: light curves ...
–1– 1. Polytropes – Derivation and Solutions of the Lane
... M ∝ R−3 . The radius of a more massive white dwarf is smaller ! The final result for the total mass and radius in this case, where µe is a constant from the equation of state related to the chemical composition of the material, is ...
... M ∝ R−3 . The radius of a more massive white dwarf is smaller ! The final result for the total mass and radius in this case, where µe is a constant from the equation of state related to the chemical composition of the material, is ...
Basic data of CoRoT-Exo-2b - tls
... TIFF (Uncompressed) decompressor are needed to see this picture. ...
... TIFF (Uncompressed) decompressor are needed to see this picture. ...
Lectures 7
... • Molecular Medium (MM): T~20 K, n > 103 cm-3, f < 1%. The MM is mostly cold dense molecular clouds which are gravitationally bound. Although, on average, this phase contains as much mass as the atomic hydrogen, it occupies only a very small fraction of the ISM. • Cold Neutral Medium (CNM; T~100 K, ...
... • Molecular Medium (MM): T~20 K, n > 103 cm-3, f < 1%. The MM is mostly cold dense molecular clouds which are gravitationally bound. Although, on average, this phase contains as much mass as the atomic hydrogen, it occupies only a very small fraction of the ISM. • Cold Neutral Medium (CNM; T~100 K, ...
The Characteristics of Stars
... which are emitting more light and which are emitting less. Although apparent magnitude values help us classify stars according to their observed brightness, they do not help us distinguish between stars that actually give off more energy and those that give off less energy. To overcome this problem, ...
... which are emitting more light and which are emitting less. Although apparent magnitude values help us classify stars according to their observed brightness, they do not help us distinguish between stars that actually give off more energy and those that give off less energy. To overcome this problem, ...
Problem Set 2
... ring’s radius in parcsec? Recall from class that the ring’s angular radius is the projected ellipse’s semi-major axis. What is the distance d to the supernova? Finally, at its brightest, SN1987A had an apparent magnitude of mV ≈ 3 mag. What was its peak absolute magnitude? Given that the Sun has an ...
... ring’s radius in parcsec? Recall from class that the ring’s angular radius is the projected ellipse’s semi-major axis. What is the distance d to the supernova? Finally, at its brightest, SN1987A had an apparent magnitude of mV ≈ 3 mag. What was its peak absolute magnitude? Given that the Sun has an ...
Andromeda and the Local Group Lesson Plan
... Way, and we’ll take a closer look at some of the nebula inside galaxies that are orbiting our own. Show the video. Review what they saw: ...
... Way, and we’ll take a closer look at some of the nebula inside galaxies that are orbiting our own. Show the video. Review what they saw: ...
CHAPTER 1 The Formation and Structure of Stars
... – The protostar stage is less than 0.1 percent of a star’s total lifetime. – Protostars form deep inside clouds of dusty gas that absorb any light the protostar might emit. ...
... – The protostar stage is less than 0.1 percent of a star’s total lifetime. – Protostars form deep inside clouds of dusty gas that absorb any light the protostar might emit. ...
Galaxies 1) What are galaxies? 2) The birth of galaxies 3
... When a galaxy forms, it has a disk shape and is called a spiral galaxy due to spiral-like "arm" structures located on the disk. There are different theories on how these disk-like distributions of stars develop from a cloud of matter: however, at present, none of them exactly predicts the results of ...
... When a galaxy forms, it has a disk shape and is called a spiral galaxy due to spiral-like "arm" structures located on the disk. There are different theories on how these disk-like distributions of stars develop from a cloud of matter: however, at present, none of them exactly predicts the results of ...
Determining the Origin of Inner Planetary System Debris Orbiting the
... of the stellar system, and tloss is the timescale of the dominant dust removal mechanism operating in the disk. The value used for tag e typically should be the best measured stellar age available, as in the case of ζ Leporis (tag e = 300 Myr; Chen & Jura 2001). However, in the case of young stars w ...
... of the stellar system, and tloss is the timescale of the dominant dust removal mechanism operating in the disk. The value used for tag e typically should be the best measured stellar age available, as in the case of ζ Leporis (tag e = 300 Myr; Chen & Jura 2001). However, in the case of young stars w ...
notes
... When a galaxy forms, it has a disk shape and is called a spiral galaxy due to spiral-like "arm" structures located on the disk. There are different theories on how these disk-like distributions of stars develop from a cloud of matter: however, at present, none of them exactly predicts the results of ...
... When a galaxy forms, it has a disk shape and is called a spiral galaxy due to spiral-like "arm" structures located on the disk. There are different theories on how these disk-like distributions of stars develop from a cloud of matter: however, at present, none of them exactly predicts the results of ...
11 The Interstellar Medium
... The Formation of Stars Like the Sun At stage 6, the core reaches 10 million K, and nuclear fusion begins. The protostar has become a star. The star continues to contract and increase in temperature, until it is in equilibrium. This is ...
... The Formation of Stars Like the Sun At stage 6, the core reaches 10 million K, and nuclear fusion begins. The protostar has become a star. The star continues to contract and increase in temperature, until it is in equilibrium. This is ...
Question paper
... 8 X and Y are identical stars. When viewed from Earth the flux from star X is 4 times the flux from star Y. Which of the following explanations is possible? A X is twice as far away as Y. B X is four times as far away as Y. C Y is twice as far away as X. D Y is four times as far away as X. (Total f ...
... 8 X and Y are identical stars. When viewed from Earth the flux from star X is 4 times the flux from star Y. Which of the following explanations is possible? A X is twice as far away as Y. B X is four times as far away as Y. C Y is twice as far away as X. D Y is four times as far away as X. (Total f ...
PPT - IAC
... Expected properties of the accreted gas - low temperatures (T < 50000 K; to keep the Hydrogen neutral). Depending on the DM halo mass, mixed with hot gas (T > 106 K). - gas infall (but infall and outflows extremely difficult to distinguish), expected to occur in the plane of the galaxy - low metall ...
... Expected properties of the accreted gas - low temperatures (T < 50000 K; to keep the Hydrogen neutral). Depending on the DM halo mass, mixed with hot gas (T > 106 K). - gas infall (but infall and outflows extremely difficult to distinguish), expected to occur in the plane of the galaxy - low metall ...
Physics from Creation to Collapse
... 8 X and Y are identical stars. When viewed from Earth the flux from star X is 4 times the flux from star Y. Which of the following explanations is possible? A X is twice as far away as Y. B X is four times as far away as Y. C Y is twice as far away as X. D Y is four times as far away as X. (Total f ...
... 8 X and Y are identical stars. When viewed from Earth the flux from star X is 4 times the flux from star Y. Which of the following explanations is possible? A X is twice as far away as Y. B X is four times as far away as Y. C Y is twice as far away as X. D Y is four times as far away as X. (Total f ...
Cosmochemistry from Nanometers to Light- Years A Written by
... Solar System formed. Although not abundant (a few parts in 100,000) compared to the stable aluminum isotope (27Al), its half-life is so short (only 730,000 years) that its decay produces a lot of heat. So much heat, in fact, that rocky bodies larger than about 10 km melt readily if they form quickly ...
... Solar System formed. Although not abundant (a few parts in 100,000) compared to the stable aluminum isotope (27Al), its half-life is so short (only 730,000 years) that its decay produces a lot of heat. So much heat, in fact, that rocky bodies larger than about 10 km melt readily if they form quickly ...
High-Energy Astrophysics - University of Iowa Astrophysics
... • In practice, gamma-rays in the X-ray band are usually referred to as X-rays • Gamma-rays typically have energies above about 100 keV ...
... • In practice, gamma-rays in the X-ray band are usually referred to as X-rays • Gamma-rays typically have energies above about 100 keV ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.