Today`s Powerpoint
... In 1960s Ray Davis and John Bahcall measured the neutrino flux from the Sun and found it to be lower than expected (by 30-50%) Confirmed in subsequent experiments Theory of p-p fusion well understood Solar interior well understood ...
... In 1960s Ray Davis and John Bahcall measured the neutrino flux from the Sun and found it to be lower than expected (by 30-50%) Confirmed in subsequent experiments Theory of p-p fusion well understood Solar interior well understood ...
V Example: our SUN (G2V)
... Supernovae A supernova occurs when the core of the massive star collapses and a shock wave rips the star apart, usually leaving behind a neutron star. Supernovae can also be produced when enough material is deposited on a white dwarf so that is exceeds the Chandrasekhar limit and collapses to a neut ...
... Supernovae A supernova occurs when the core of the massive star collapses and a shock wave rips the star apart, usually leaving behind a neutron star. Supernovae can also be produced when enough material is deposited on a white dwarf so that is exceeds the Chandrasekhar limit and collapses to a neut ...
Characteristics of Main Sequence Stars
... • The interiors of stars are extremely hot (T > 106 K). The fall-off to surface temperatures (T ∼ 104 K) takes place in a very thin region near the surface. • The region of nuclear energy generation is restricted to a very small mass range near the center of the star. The rapid fall-off of ²n with ...
... • The interiors of stars are extremely hot (T > 106 K). The fall-off to surface temperatures (T ∼ 104 K) takes place in a very thin region near the surface. • The region of nuclear energy generation is restricted to a very small mass range near the center of the star. The rapid fall-off of ²n with ...
Does size matter (in the SFRs)?
... It is well known that the Hα luminosity is a good tracer of the star formation in a galaxy (Kennicutt 1983 ApJ, 273, 54). The Star Formation Rate (SFR) along the Hubble sequence has been studied extensively (e.g. Kennicutt 1998 ARA&A, 36, 189) and some of the main results are: -SFR increases for lat ...
... It is well known that the Hα luminosity is a good tracer of the star formation in a galaxy (Kennicutt 1983 ApJ, 273, 54). The Star Formation Rate (SFR) along the Hubble sequence has been studied extensively (e.g. Kennicutt 1998 ARA&A, 36, 189) and some of the main results are: -SFR increases for lat ...
Teacher Guide Lives of Stars
... which these stars differ as they progress through their various stages of life and death. A star, like our Sun, is an enormous and complex system. In order to model and understand their properties and how they change with time, astronomers and astrophysicists apply the basic ideas in physics to math ...
... which these stars differ as they progress through their various stages of life and death. A star, like our Sun, is an enormous and complex system. In order to model and understand their properties and how they change with time, astronomers and astrophysicists apply the basic ideas in physics to math ...
Notes - Michigan State University
... This is the fraction of matter in the Galaxy that had to be processed through the scenario (massive stars here) to account for todays observed solar abundances. To explain the origin of the elements one needs to have • constant overproduction (then the pattern is solar) • sufficiently high overprodu ...
... This is the fraction of matter in the Galaxy that had to be processed through the scenario (massive stars here) to account for todays observed solar abundances. To explain the origin of the elements one needs to have • constant overproduction (then the pattern is solar) • sufficiently high overprodu ...
Directed Reading A
... _____ 4. All of the following characteristics are used to classify stars EXCEPT a. age. c. brightness. b. name. d. temperature. _____ 5. Which one of the following is NOT true about stars? a. A star goes through many changes during its life cycle. b. A star can become a different type of star as it ...
... _____ 4. All of the following characteristics are used to classify stars EXCEPT a. age. c. brightness. b. name. d. temperature. _____ 5. Which one of the following is NOT true about stars? a. A star goes through many changes during its life cycle. b. A star can become a different type of star as it ...
upperMS - CWRU Astronomy
... 60% of a star over 15% of its main sequence lifetime If 40% of the remaining mass can be removed in the final 85% of the lifetime, then it’s a nitrogen rich star It’s ok to lose this much mass and still be OB, but if it loses much more, then its luminosity will be too low Often present in young clus ...
... 60% of a star over 15% of its main sequence lifetime If 40% of the remaining mass can be removed in the final 85% of the lifetime, then it’s a nitrogen rich star It’s ok to lose this much mass and still be OB, but if it loses much more, then its luminosity will be too low Often present in young clus ...
General Relativity and the Accelerated Expansion of the Universe
... Gravity is always attractive, right? Wrong, if we are to go by the research papers of S Perlmutter, A Riess and B Schmidt, for which they have been awarded this year's Nobel Prize in Physics [1{5]. The trio looked at Type Ia supernovae, located in far away galaxies, to measure their distances accura ...
... Gravity is always attractive, right? Wrong, if we are to go by the research papers of S Perlmutter, A Riess and B Schmidt, for which they have been awarded this year's Nobel Prize in Physics [1{5]. The trio looked at Type Ia supernovae, located in far away galaxies, to measure their distances accura ...
White Dwarfs
... B: The star is slowly shrinking as it slides down the main sequence from top left to bottom right. C: The star is generating energy by helium fusion, having stopped hydrogen "burning." D: The star is generating internal energy by hydrogen fusion. ...
... B: The star is slowly shrinking as it slides down the main sequence from top left to bottom right. C: The star is generating energy by helium fusion, having stopped hydrogen "burning." D: The star is generating internal energy by hydrogen fusion. ...
Background Information - Eu-Hou
... In the early 20th century, after investigating the effects of an object’s temperature and of the colour of its radiation, scientists reasoned that there should be a relationship between the temperature of a star and its luminosity. If all stars were alike, those with the same luminosity would have e ...
... In the early 20th century, after investigating the effects of an object’s temperature and of the colour of its radiation, scientists reasoned that there should be a relationship between the temperature of a star and its luminosity. If all stars were alike, those with the same luminosity would have e ...
GEARS Workshop Monday - Georgia Southern University
... our own Sun, have found a remarkable object where the nuclear reactor that once powered it has only just shut down. This star, the hottest known white dwarf, H1504+65, seems to have been stripped of its entire outer regions during its death throes leaving behind the core that formed its power plant. ...
... our own Sun, have found a remarkable object where the nuclear reactor that once powered it has only just shut down. This star, the hottest known white dwarf, H1504+65, seems to have been stripped of its entire outer regions during its death throes leaving behind the core that formed its power plant. ...
Constituents of the Milky Way
... • To help interpret observations of our Galaxy (and others), let’s divide the constituents of the Galaxy into two populations: Population I: objects associated with recent star formation Population II: objects with no connection to recent star formation Thus, short-lived stars, open clusters, da ...
... • To help interpret observations of our Galaxy (and others), let’s divide the constituents of the Galaxy into two populations: Population I: objects associated with recent star formation Population II: objects with no connection to recent star formation Thus, short-lived stars, open clusters, da ...
Chandra`s X-ray vision seeks out black holes
... star formation. These X-ray objects appear point-like and are between 10 and 1000 times more luminous in X-rays than similar sources found in our galaxy. Although a few of the objects had previously been recorded, this is the first time they have been detected in such large numbers. This may help to ...
... star formation. These X-ray objects appear point-like and are between 10 and 1000 times more luminous in X-rays than similar sources found in our galaxy. Although a few of the objects had previously been recorded, this is the first time they have been detected in such large numbers. This may help to ...
The Milky Way Galaxy
... To determine the rotation curve of the Galaxy, we will introduce a more convenient coordinate system, called the Galactic coordinate system. Note that the plane of the solar system is not the same as the plane of the Milky Way disk, and the Earth itself is tipped with respect to the plane of the sol ...
... To determine the rotation curve of the Galaxy, we will introduce a more convenient coordinate system, called the Galactic coordinate system. Note that the plane of the solar system is not the same as the plane of the Milky Way disk, and the Earth itself is tipped with respect to the plane of the sol ...