Chemical Composition and Evolutionary Status of the Ap Star HD
... HD 138633 can be achieved by increasing the effective temperature by 1000 K, which disagrees with the photometric data and the observed hydrogen line profiles. In the atmospheres of magnetic peculiar stars, where their slow rotation and magnetic field lead to stabilization of all macro- and micro-moti ...
... HD 138633 can be achieved by increasing the effective temperature by 1000 K, which disagrees with the photometric data and the observed hydrogen line profiles. In the atmospheres of magnetic peculiar stars, where their slow rotation and magnetic field lead to stabilization of all macro- and micro-moti ...
AST301.Ch18.InterstelMed - University of Texas Astronomy
... illustration) in shape. We know (how? See p.472, but we’ll discuss in class) they are composed of silicates (like rocks on earth), graphite (or something like it), and maybe iron, with a coating of various ices (“dirty ice”). Origin. When we try to get abundances of the elements in the gas (using sp ...
... illustration) in shape. We know (how? See p.472, but we’ll discuss in class) they are composed of silicates (like rocks on earth), graphite (or something like it), and maybe iron, with a coating of various ices (“dirty ice”). Origin. When we try to get abundances of the elements in the gas (using sp ...
My power point presentation on spectroscopy of stars (ppt file)
... • Sometime fitting works reasonably well, but not perfectly • In this case we can often obtain approximate values of parameters such as chemical abundances, rotation, … • The remaining discrepancies give us information about physics missing from the model • For the supergiant omicron Scorpii, the di ...
... • Sometime fitting works reasonably well, but not perfectly • In this case we can often obtain approximate values of parameters such as chemical abundances, rotation, … • The remaining discrepancies give us information about physics missing from the model • For the supergiant omicron Scorpii, the di ...
DTU_9e_ch13
... Supernova remnants, such as Cassiopeia A, are typically strong sources of X rays and radio waves. (a) A radio image produced by the Very Large Array (VLA). (b) A corresponding X-ray picture of Cassiopeia A taken by Chandra. The opposing jets of silicon, probably guided by powerful magnetic fields, w ...
... Supernova remnants, such as Cassiopeia A, are typically strong sources of X rays and radio waves. (a) A radio image produced by the Very Large Array (VLA). (b) A corresponding X-ray picture of Cassiopeia A taken by Chandra. The opposing jets of silicon, probably guided by powerful magnetic fields, w ...
Instructor Notes
... Helium Flash – core gets hot enough to fuse He, but doesn’t expand (so not offsetting gravity), so fuses faster and faster, until temperature becomes so high that electrons can move away from nuclei and are no longer degenerate. Star’s core rapidly expands (helium flash) and then settles down to ste ...
... Helium Flash – core gets hot enough to fuse He, but doesn’t expand (so not offsetting gravity), so fuses faster and faster, until temperature becomes so high that electrons can move away from nuclei and are no longer degenerate. Star’s core rapidly expands (helium flash) and then settles down to ste ...
ph600-12 - University of Kent
... We present an evolutionary picture of a forming star. We assume a singular isothermal sphere as the initial state of the core that undergoes collapse, as described by Shu. We include the evolution of a first hydrostatic core at early times and allow a disk to grow, as predicted by Adams & Shu. We us ...
... We present an evolutionary picture of a forming star. We assume a singular isothermal sphere as the initial state of the core that undergoes collapse, as described by Shu. We include the evolution of a first hydrostatic core at early times and allow a disk to grow, as predicted by Adams & Shu. We us ...
What is the Zodiac? The Zodiac is defined by 12 constellations
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
Sermon Notes
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
Right Ascension
... When the fuel runs out, the balance between gravity pulling material in and gas pressure pushing it out breaks down. The core begins to contract because energy is no longer being produced. As the core contracts, it gets hotter and hotter, as the pressure increases. What happens next depends on the m ...
... When the fuel runs out, the balance between gravity pulling material in and gas pressure pushing it out breaks down. The core begins to contract because energy is no longer being produced. As the core contracts, it gets hotter and hotter, as the pressure increases. What happens next depends on the m ...
Heavy Metal from Ancient Superstars
... interiors to produce helium. Hydrogen burning also rearranges carbon, nitrogen, and oxygen. ...
... interiors to produce helium. Hydrogen burning also rearranges carbon, nitrogen, and oxygen. ...
Chapter 14. Stellar Structure and Evolution
... When a star first forms it is chemically homogeneous and composed mostly of Hydrogen. The temperature and density must be highest at its core to provide the pressure needed to support the full weight of the star. Naturally, it is deep in the core, then, that conditions first become suitable for ther ...
... When a star first forms it is chemically homogeneous and composed mostly of Hydrogen. The temperature and density must be highest at its core to provide the pressure needed to support the full weight of the star. Naturally, it is deep in the core, then, that conditions first become suitable for ther ...
Scientific American`s Ask the Experts
... the asteroid belt on its way to Jupiter. But it took some effort to find an object that was located even roughly along Galileo’s path. Special targeting was required to reach this object, but the result was the first close-up view of an asteroid, the one called Gaspra. The number of objects in the ast ...
... the asteroid belt on its way to Jupiter. But it took some effort to find an object that was located even roughly along Galileo’s path. Special targeting was required to reach this object, but the result was the first close-up view of an asteroid, the one called Gaspra. The number of objects in the ast ...
Deaths of Stars - Chabot College
... “Two particles cannot occupy same space with same momentum (energy)” ...
... “Two particles cannot occupy same space with same momentum (energy)” ...
Ch. 17 (RGs & WDs)
... 17.5 The Hertzsprung–Russell Diagram An H–R diagram of the 100 brightest stars ...
... 17.5 The Hertzsprung–Russell Diagram An H–R diagram of the 100 brightest stars ...
The Physics of the Sun
... The equatorial coordinate system is used to illustrate the motion of heavenly stars on the celestial sphere—an imaginary sphere of radius equal to the distance of stars so that they appear to be lying on its surface. The projection of the earth’s equator onto the celestial sphere is called the celes ...
... The equatorial coordinate system is used to illustrate the motion of heavenly stars on the celestial sphere—an imaginary sphere of radius equal to the distance of stars so that they appear to be lying on its surface. The projection of the earth’s equator onto the celestial sphere is called the celes ...
THE EARTH
... become the way they are. As children become more familiar with their world, they can be guided to observe changes, including cyclic changes, such as night and day and the seasons; predictable trends, such as growth and decay, and less consistent changes, such as weather or the appearance of meteors. ...
... become the way they are. As children become more familiar with their world, they can be guided to observe changes, including cyclic changes, such as night and day and the seasons; predictable trends, such as growth and decay, and less consistent changes, such as weather or the appearance of meteors. ...
A6 - Vicphysics
... them. These are generally matched to the relevant syllabus points although some comments and ideas are applicable across several sections of the syllabus. In addition to the material specifically targeting the Victorian VCE Physics syllabus material from two additional papers has been incorporated i ...
... them. These are generally matched to the relevant syllabus points although some comments and ideas are applicable across several sections of the syllabus. In addition to the material specifically targeting the Victorian VCE Physics syllabus material from two additional papers has been incorporated i ...
Charcteristic of Stars Powerpoint C
... equal 1 solar radius. • In comparison white dwarfs are about the same size as Earth and would equal 0.01 solar radius. Supergiants can have sizes up to 1,000 solar radii. ...
... equal 1 solar radius. • In comparison white dwarfs are about the same size as Earth and would equal 0.01 solar radius. Supergiants can have sizes up to 1,000 solar radii. ...
Star Life Cycle Web Activity
... of a Star. Read the web page and the summary of a typical cycle of stars given here. Stars repeat a cycle of reaching equilibrium and then losing it after burning out one fuel source…then condensing (shrinking) because of gravity, making the core more dense and hotter…so hot that now a new element c ...
... of a Star. Read the web page and the summary of a typical cycle of stars given here. Stars repeat a cycle of reaching equilibrium and then losing it after burning out one fuel source…then condensing (shrinking) because of gravity, making the core more dense and hotter…so hot that now a new element c ...
