It is now recognized that the vast majority of ellipticals are of
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
Energy production in stars
... in the stars we have almost unlimited time, and a large supply of protons of high energy. As we shall see presently, the rate of energy production by this simple reaction fits the observed energy production in the sun very well. The deuterons formed in (21) will quickly react further, and the end pr ...
... in the stars we have almost unlimited time, and a large supply of protons of high energy. As we shall see presently, the rate of energy production by this simple reaction fits the observed energy production in the sun very well. The deuterons formed in (21) will quickly react further, and the end pr ...
Here
... The dust in these clouds is only a minor constitutent. Most of the mass is in the form of cold molecular gas. This gas has a temperature of only a few tens of Kelvin above absolute zero. The clouds are mostly molecular hydrogen but over 100 different molecules have been detected in these clouds, in ...
... The dust in these clouds is only a minor constitutent. Most of the mass is in the form of cold molecular gas. This gas has a temperature of only a few tens of Kelvin above absolute zero. The clouds are mostly molecular hydrogen but over 100 different molecules have been detected in these clouds, in ...
Reach for the Stars – Div. B
... last few thousand years have produced the Helix Nebula (NGC 7293), a well studied and nearby example of a Planetary Nebula, typical of this final phase of stellar evolution for a solar mass star. ...
... last few thousand years have produced the Helix Nebula (NGC 7293), a well studied and nearby example of a Planetary Nebula, typical of this final phase of stellar evolution for a solar mass star. ...
Star Light, Star Bright
... each of the 40 hands-on activities at this grade level. 1. Ask, Why does a streetlight just 10 meters away from us appear brighter to us than the full Moon or any stars in the night sky? (Even though the streetlight is less intense in brightness than the full Moon or stars, it is closer to us, so it ...
... each of the 40 hands-on activities at this grade level. 1. Ask, Why does a streetlight just 10 meters away from us appear brighter to us than the full Moon or any stars in the night sky? (Even though the streetlight is less intense in brightness than the full Moon or stars, it is closer to us, so it ...
May
... opposite direction! Where the two countra-rotating sections meet, the interacting dust and gas creates large areas of new star formation, seen as brighter areas. How did this happen? It is probably the odd outcome of the collision of two galaxies in the distant past. M53 is a globular cluster in the ...
... opposite direction! Where the two countra-rotating sections meet, the interacting dust and gas creates large areas of new star formation, seen as brighter areas. How did this happen? It is probably the odd outcome of the collision of two galaxies in the distant past. M53 is a globular cluster in the ...
Lecture notes 10
... Fusion Reactions in Stars Note that as H → He the mean molecular weight increases. The ideal gas law predicts that the central pressure, PC, will then decrease. The star will no longer be in equilibrium and will collapse, raising the temperature. At some point He begins to “burn” (fuse to C). Triple ...
... Fusion Reactions in Stars Note that as H → He the mean molecular weight increases. The ideal gas law predicts that the central pressure, PC, will then decrease. The star will no longer be in equilibrium and will collapse, raising the temperature. At some point He begins to “burn” (fuse to C). Triple ...
Highlights of the Month - Bridgend Astronomical Society
... Messier in 1773 and the spiral structure was observed by Lord Rosse in 1845 using the 72" reflector at Birr Castle in Ireland - for many years the largest telescope in the world. ...
... Messier in 1773 and the spiral structure was observed by Lord Rosse in 1845 using the 72" reflector at Birr Castle in Ireland - for many years the largest telescope in the world. ...
The Milky Way: Spiral galaxies:
... absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. •! HI gas mass is directly proportional to 21 cm line intensity •! HI disk is much more extended than optical light, typicall ...
... absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. •! HI gas mass is directly proportional to 21 cm line intensity •! HI disk is much more extended than optical light, typicall ...
AST4930 Star and Planet Formation
... Young star forming regions are often part of larger complexes including subgroups. An example is shown below: the Scorpius-Centaurus association. These subgroups generally formed as part of a joint structure of clouds, or molecular cloud complex. However, different subgroups may have formed at diffe ...
... Young star forming regions are often part of larger complexes including subgroups. An example is shown below: the Scorpius-Centaurus association. These subgroups generally formed as part of a joint structure of clouds, or molecular cloud complex. However, different subgroups may have formed at diffe ...
The Great Nebula in Orion
... temperature and luminosity. From these measurements, we can determine the radius, mass, age, and even the mass accretion rate of each star. This catalog of stellar properties will be the largest uniform survey of young stars ever achieved. The Hubble images reveal dozens of candidates for brown dwar ...
... temperature and luminosity. From these measurements, we can determine the radius, mass, age, and even the mass accretion rate of each star. This catalog of stellar properties will be the largest uniform survey of young stars ever achieved. The Hubble images reveal dozens of candidates for brown dwar ...
A Review of Macroscopic Motion in Thermodynamic Equilibrium
... A new analysis of the problem of a conductor moving across a magnetic field was carried out by Drell et al in 1965 [7]. They straightforwardly considered current as arising from the electric field as seen by a co-moving observer. They suggested that the main impedance in the current circuit, closed ...
... A new analysis of the problem of a conductor moving across a magnetic field was carried out by Drell et al in 1965 [7]. They straightforwardly considered current as arising from the electric field as seen by a co-moving observer. They suggested that the main impedance in the current circuit, closed ...
Welcome! Astronomy 100 / 190Y Exploring the Universe (Section A)
... 10 billion years from now, our beloved planet will be long dead. If none of the others happen beforehand, how will the Earth finally meet its end? 1) a nearby star will supernova – irradiating the planet with deadly high-energy particles 2) our Sun will expand and engulf the Earth in its 5000+ degre ...
... 10 billion years from now, our beloved planet will be long dead. If none of the others happen beforehand, how will the Earth finally meet its end? 1) a nearby star will supernova – irradiating the planet with deadly high-energy particles 2) our Sun will expand and engulf the Earth in its 5000+ degre ...
Document
... • As the Earth orbits the Sun, the closest starts appear to change positions relative to the very distinct ‘fixed stars’. • This effect is called parallax • The stars have not actually moved. It is the Earth that has moved. ...
... • As the Earth orbits the Sun, the closest starts appear to change positions relative to the very distinct ‘fixed stars’. • This effect is called parallax • The stars have not actually moved. It is the Earth that has moved. ...
TMSP Stellar Evolution & Life
... i. looking directly at the light source (produces a bright coloured line against a black background; this is called an emission spectrum) How does this happen? •Each of the absorption and emission spectra are produced by specific energies (wavelengths) of light interacting with the atoms that make u ...
... i. looking directly at the light source (produces a bright coloured line against a black background; this is called an emission spectrum) How does this happen? •Each of the absorption and emission spectra are produced by specific energies (wavelengths) of light interacting with the atoms that make u ...
The Helix Nebula • NGC 7293
... knowledge that the planetary nebula phase represents a late stage in the lives of low-mass, Sun-like stars. Students may think all stars end their lives the same way – as supernovae. Whether a star becomes a planetary nebula or a supernova depends on its original mass. Only massive stars will become ...
... knowledge that the planetary nebula phase represents a late stage in the lives of low-mass, Sun-like stars. Students may think all stars end their lives the same way – as supernovae. Whether a star becomes a planetary nebula or a supernova depends on its original mass. Only massive stars will become ...
We Are Made of Stardust
... hydrogen into helium on the “Main Sequence” of star creativity. During this time, however, they burn much hotter and brighter than does our yellow sun; these large stars burn BLUE-WHITE. And their stronger gravity makes them burn faster too. Once a threshold level of helium has been generated (for v ...
... hydrogen into helium on the “Main Sequence” of star creativity. During this time, however, they burn much hotter and brighter than does our yellow sun; these large stars burn BLUE-WHITE. And their stronger gravity makes them burn faster too. Once a threshold level of helium has been generated (for v ...
Starspots (AIP – Klaus G
... still extremely rare (except for the Sun). We will carry out such measurements with the highresolution spectropolarimeter PEPSI of the 11.8m Large Binocular Telescope (LBT). A central scientific question in this thesis is to map the distribution of magnetic flux throughout the H-R diagram and qualif ...
... still extremely rare (except for the Sun). We will carry out such measurements with the highresolution spectropolarimeter PEPSI of the 11.8m Large Binocular Telescope (LBT). A central scientific question in this thesis is to map the distribution of magnetic flux throughout the H-R diagram and qualif ...
Part 2 - Stellar Evolution
... A star with a fusion core and an envelope is in hydrostatic equilibrium If there is a perturbation of T, say increasing T, the core expands and cools off, reduce the nuclear energy production; as a result, T goes back to normal But slowly, because of P=nKT, as number density decreases through nuclea ...
... A star with a fusion core and an envelope is in hydrostatic equilibrium If there is a perturbation of T, say increasing T, the core expands and cools off, reduce the nuclear energy production; as a result, T goes back to normal But slowly, because of P=nKT, as number density decreases through nuclea ...