STARS IN HYDROSTATIC EQUILIBRIUM Gravitational energy and
... Clearly, there is an asymptotic solution of the differential equation (eql.23): x = 1, i.e. R = RM S , i.e. the stellar radius is equal to its main sequence value. Now we may ask a question: is the main sequence star thermally stable? If we make a small perturbation, making a star slightly smaller o ...
... Clearly, there is an asymptotic solution of the differential equation (eql.23): x = 1, i.e. R = RM S , i.e. the stellar radius is equal to its main sequence value. Now we may ask a question: is the main sequence star thermally stable? If we make a small perturbation, making a star slightly smaller o ...
Powerpoint
... For helium burning, there is no effect around 10 solar mases, but the higher masses have a longer lifetime with higher metallicity because mass loss decreases the mass. For lower masses, there is a significant metallicity dependence for the helium burning lifetime. The reason is not clear. Perhaps ...
... For helium burning, there is no effect around 10 solar mases, but the higher masses have a longer lifetime with higher metallicity because mass loss decreases the mass. For lower masses, there is a significant metallicity dependence for the helium burning lifetime. The reason is not clear. Perhaps ...
CoRoT: a space project to listen to the songs of the stars
... Many stars can vibrate in different modes like a musical instrument. For example, vibrations detected on the surface of the Sun have been well known for more than three decades. The stellar pulsations are difficult to detect as the stars are very distant and the periods in Sun-like stars are only fe ...
... Many stars can vibrate in different modes like a musical instrument. For example, vibrations detected on the surface of the Sun have been well known for more than three decades. The stellar pulsations are difficult to detect as the stars are very distant and the periods in Sun-like stars are only fe ...
Astronomy Assignment #1
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
solar system formation notes
... Simply stated, this means everything moves around the Sun in the same way. ...
... Simply stated, this means everything moves around the Sun in the same way. ...
Neutrino mass and neutrino dark matter Do non
... • Observed DM of Abell 1689 cluster explained by thermal fermions of eV mass. keV, MeV, GeV, TeV, PeV excluded. Thermal bosons (axions) excluded. • Fitting with global dark matter fraction: 6 active + 6 sterile (anti-)neutrinos Mass about 1.45 eV, depends on h. Ideal case: m=1.4998 eV, h=0.744 • ...
... • Observed DM of Abell 1689 cluster explained by thermal fermions of eV mass. keV, MeV, GeV, TeV, PeV excluded. Thermal bosons (axions) excluded. • Fitting with global dark matter fraction: 6 active + 6 sterile (anti-)neutrinos Mass about 1.45 eV, depends on h. Ideal case: m=1.4998 eV, h=0.744 • ...
Stellar evolution
... • The supernova can last weeks or months, and release as much energy as the sun does in its entire lifespan. • The supernova is a main source of heavy elements in the universe. • The remaining core will collapse into either a neutron star or a black hole. ...
... • The supernova can last weeks or months, and release as much energy as the sun does in its entire lifespan. • The supernova is a main source of heavy elements in the universe. • The remaining core will collapse into either a neutron star or a black hole. ...
Document
... Uranus • Uranus is the seventh planet from the sun and the third largest. • It orbits 2,870,990,000 km from the sun. • Its diameter is 51,118 km. • The mass is 8.683e25 kg. • Uranus has only been visited one time, by the Voyager 2 in 1986. • Axis makes the planet spin nearly sideways; has rings and ...
... Uranus • Uranus is the seventh planet from the sun and the third largest. • It orbits 2,870,990,000 km from the sun. • Its diameter is 51,118 km. • The mass is 8.683e25 kg. • Uranus has only been visited one time, by the Voyager 2 in 1986. • Axis makes the planet spin nearly sideways; has rings and ...
1 kg -1 - Daya Bay Reactor Neutrino Experiment in Hong Kong
... Similar background at KS & Y2L for same detector Apparent difference between 5 g & 1 kg at T> 5 keV due to scaling with surface area instead, reproduced in simulations Best Background with 4X5 g comparable to CRESST-1 Intensive studies on background understanding under way ...
... Similar background at KS & Y2L for same detector Apparent difference between 5 g & 1 kg at T> 5 keV due to scaling with surface area instead, reproduced in simulations Best Background with 4X5 g comparable to CRESST-1 Intensive studies on background understanding under way ...
The Milky Way - Clive Gifford
... Triangulam galaxy and Canis Major Dwarf as well as a further 40 galaxies, some of which have only recently been discovered. The Local Group has a diameter of about 10 million light years. ...
... Triangulam galaxy and Canis Major Dwarf as well as a further 40 galaxies, some of which have only recently been discovered. The Local Group has a diameter of about 10 million light years. ...
Pocket Solar System
... our Solar System, as illustrated by the Pocket Solar System activity, is really just an interesting coincidence. Bode’s Law, also known as the Titius-Bode Law, was developed in the 1700’s before the discovery of Uranus, Neptune, Pluto, or the Asteroid Belt. This “Law” is a mathematical way to descri ...
... our Solar System, as illustrated by the Pocket Solar System activity, is really just an interesting coincidence. Bode’s Law, also known as the Titius-Bode Law, was developed in the 1700’s before the discovery of Uranus, Neptune, Pluto, or the Asteroid Belt. This “Law” is a mathematical way to descri ...
Model of Solar System
... Student response shows the Sun and the four inner planets in correct order with non-intersecting orbits. The planets are represented by their properly labeled orbits. Partial - Student Response 1 In the space below, draw a rough sketch (not necessarily to scale) illustrating the simplified model of ...
... Student response shows the Sun and the four inner planets in correct order with non-intersecting orbits. The planets are represented by their properly labeled orbits. Partial - Student Response 1 In the space below, draw a rough sketch (not necessarily to scale) illustrating the simplified model of ...
Asteroseismology of white dwarf stars provides important constraints
... magnitude, this star has not been observed extensively since its discovery and little is known about its pulsation characteristics. Our first goal is to measure an accurate set of frequencies in this complex pulsator, and for this the coverage provided by the Whole Earth Telescope is essential. Thes ...
... magnitude, this star has not been observed extensively since its discovery and little is known about its pulsation characteristics. Our first goal is to measure an accurate set of frequencies in this complex pulsator, and for this the coverage provided by the Whole Earth Telescope is essential. Thes ...
Radiation
... horizon as viewed by observer. Center at elevation angle of -0.833o. Civil twilight: Sun center no lower than -6o. Military twilight: Sun center no lower than ...
... horizon as viewed by observer. Center at elevation angle of -0.833o. Civil twilight: Sun center no lower than -6o. Military twilight: Sun center no lower than ...
1 Sun Stars Planets. Problem Sheet I
... (b) The measured speeds of convection in granular cells at the surface of the sun are about 2 km/s and the photospheric density is of order 10-3 kg m-3 . A magnetic field of strength B will be able to alter the motion of a plasma in which it is embedded when the magnetic energy density B2 /2 µo is g ...
... (b) The measured speeds of convection in granular cells at the surface of the sun are about 2 km/s and the photospheric density is of order 10-3 kg m-3 . A magnetic field of strength B will be able to alter the motion of a plasma in which it is embedded when the magnetic energy density B2 /2 µo is g ...
The Solar System
... Distance from Earth: Max 1,579 million km Min 1,279 million km Atmosphere: Mainly hydrogen and helium Temperature: -180oC at the surface 12,000oC at the core Length of Year: 10,750 Earth days Length of Day: 10 Earth hours 14 minutes Moons: 31+ (Titan, Iapetus, Dione, Encelaus, Mimas) Colour: Beige C ...
... Distance from Earth: Max 1,579 million km Min 1,279 million km Atmosphere: Mainly hydrogen and helium Temperature: -180oC at the surface 12,000oC at the core Length of Year: 10,750 Earth days Length of Day: 10 Earth hours 14 minutes Moons: 31+ (Titan, Iapetus, Dione, Encelaus, Mimas) Colour: Beige C ...