Star formation, feedback and the role of SNe II and SNe Ia in the
... most of the gas in dwarf galaxies with halo circular velocities lower than 30 km s-1. Mayer et at 2006 simulated the interaction of dwarf spheroidal galaxies with the Milky Way halo and found that a galaxy similar to Draco can be stripped completely of its gas in a time scale 2-3 Gyr if the gas is m ...
... most of the gas in dwarf galaxies with halo circular velocities lower than 30 km s-1. Mayer et at 2006 simulated the interaction of dwarf spheroidal galaxies with the Milky Way halo and found that a galaxy similar to Draco can be stripped completely of its gas in a time scale 2-3 Gyr if the gas is m ...
The Celestial Sphere
... 1. Prepare the two star charts by cutting along the outside lines with the scissors. The star chart will look like a black flower with eight petals. The white line that crosses four of the petals is the ECLIPTIC. This line represents the apparent path of the Sun against the stars due to the motion o ...
... 1. Prepare the two star charts by cutting along the outside lines with the scissors. The star chart will look like a black flower with eight petals. The white line that crosses four of the petals is the ECLIPTIC. This line represents the apparent path of the Sun against the stars due to the motion o ...
stars - acpsd
... Neutron Stars and Pulsars : Sometimes the core remnant of a low-mass star is too dense to form a white dwarf. In these cases, the core�stellar collapse forms a neutron star. Neutron stars are incredibly dense spheres of degenerate neutrons (a gas in which all the allowed states for particles, electr ...
... Neutron Stars and Pulsars : Sometimes the core remnant of a low-mass star is too dense to form a white dwarf. In these cases, the core�stellar collapse forms a neutron star. Neutron stars are incredibly dense spheres of degenerate neutrons (a gas in which all the allowed states for particles, electr ...
Energy production in stars
... This would be enough to supply the sun’s radiation for 1500 milliards of years. However nobody has ever observed the complete annihilation of matter. From experiments on earth we know that protons and electrons do not annihilate each other in 1030 years. It is hard to believe that the situation woul ...
... This would be enough to supply the sun’s radiation for 1500 milliards of years. However nobody has ever observed the complete annihilation of matter. From experiments on earth we know that protons and electrons do not annihilate each other in 1030 years. It is hard to believe that the situation woul ...
document
... – Rigel gives off 104 (=10,000) times more energy per unit surface area than Betelgeuse ...
... – Rigel gives off 104 (=10,000) times more energy per unit surface area than Betelgeuse ...
Lecture 10 - University of Minnesota
... forming cloud varies with density. Following these examples (especially the ones on page 533), figure out how dense the could would have to be to form a single, 1 solar mass star. What does this say about why stars usually form in clusters? ...
... forming cloud varies with density. Following these examples (especially the ones on page 533), figure out how dense the could would have to be to form a single, 1 solar mass star. What does this say about why stars usually form in clusters? ...
The Life Cycle of A Star
... possible that this core will remain intact after the supernova, and be called a neutron star. However, if the original star was very massive (say 15 or more times the mass of our Sun), even the neutrons will not be able to survive the core collapse and a black hole will form! ...
... possible that this core will remain intact after the supernova, and be called a neutron star. However, if the original star was very massive (say 15 or more times the mass of our Sun), even the neutrons will not be able to survive the core collapse and a black hole will form! ...
Practice Exam for 3 rd Astronomy Exam
... In the Milky Way Galaxy there are very many Giant Molecular Clouds (GMC). A typical GMC contains most hydrogen and helium gas and microscopic solid particles of ice and rocky material known collectively as “dust”. The typical GMC may be 300 ly in diameter and encompass 300,000 solar masses of gas an ...
... In the Milky Way Galaxy there are very many Giant Molecular Clouds (GMC). A typical GMC contains most hydrogen and helium gas and microscopic solid particles of ice and rocky material known collectively as “dust”. The typical GMC may be 300 ly in diameter and encompass 300,000 solar masses of gas an ...
Stars
... • Earth rotates on its axis, this makes most constellations appear to rise in the east and set in the west during the night. • Most constellations appear in many different positions in the sky as the Earth revolves around the sun. • There is a group of stars that appear in the sky all night long and ...
... • Earth rotates on its axis, this makes most constellations appear to rise in the east and set in the west during the night. • Most constellations appear in many different positions in the sky as the Earth revolves around the sun. • There is a group of stars that appear in the sky all night long and ...
SECTION 30.2 Measuring the Stars 1. Constellations are a. the
... c. measuring the position of the visible star in the pair and noting shifts as it orbits the center of mass between it and the unseen companion star. d. examining the stars’ absorption spectra. 5. When estimating the distance of stars from Earth, astronomers use the fact that nearby stars shift in p ...
... c. measuring the position of the visible star in the pair and noting shifts as it orbits the center of mass between it and the unseen companion star. d. examining the stars’ absorption spectra. 5. When estimating the distance of stars from Earth, astronomers use the fact that nearby stars shift in p ...
Radio-quiet Isolated Neutron Stars
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
Neutron Star - Perry Local Schools
... other atoms in random directions. Atoms near the star’s surface radiate energy into space. ...
... other atoms in random directions. Atoms near the star’s surface radiate energy into space. ...
aaswinter07ppt
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
death_high_mass
... Helium gone in the core • Helium fusion rate is much faster than the Hydrogen fusion rate was. Within a few hundred million years the supply is gone in the core. • The core once again shrinks, releasing gravitational potential energy. • The material in a shell closest to the core begins to fuse hel ...
... Helium gone in the core • Helium fusion rate is much faster than the Hydrogen fusion rate was. Within a few hundred million years the supply is gone in the core. • The core once again shrinks, releasing gravitational potential energy. • The material in a shell closest to the core begins to fuse hel ...