Determining the Sizes of Stars Using the HR Diagram
... Stars are born with a wide variety of mass. The most massive stars are 100 times more massive than the Sun while the least massive ones are only 0.08 times the mass of the Sun. Most stars spend about 90% of their lifetimes shining due to nuclear fusion that goes on in their cores, but after awhile t ...
... Stars are born with a wide variety of mass. The most massive stars are 100 times more massive than the Sun while the least massive ones are only 0.08 times the mass of the Sun. Most stars spend about 90% of their lifetimes shining due to nuclear fusion that goes on in their cores, but after awhile t ...
5 Understanding stars and star ClUsters
... Understanding Stars and Star Clusters Stars are formed from gas and dust compressed together by various forces. Star clusters are formed in several different ways. In what are called open clusters, it is usually the sweeping wave action of the spiral arms of the galaxy thrusting vast stretches of th ...
... Understanding Stars and Star Clusters Stars are formed from gas and dust compressed together by various forces. Star clusters are formed in several different ways. In what are called open clusters, it is usually the sweeping wave action of the spiral arms of the galaxy thrusting vast stretches of th ...
AST1001.ch13
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas • It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun). ...
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas • It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun). ...
EarthComm_c1s9
... interesting, but they also show scientists what the fate of our solar system will be billions of years from now. What would happen if there were a supernova explosion in our stellar neighborhood some time in the future? Depending on how close it was, you could be bombarded with strong radiation and ...
... interesting, but they also show scientists what the fate of our solar system will be billions of years from now. What would happen if there were a supernova explosion in our stellar neighborhood some time in the future? Depending on how close it was, you could be bombarded with strong radiation and ...
The closest extrasolar planet: A giant planet around the M4 dwarf Gl
... X. Delfosse12 , T. Forveille2 , M. Mayor1 , C. Perrier2 , D. Naef1 , and D. Queloz31 ...
... X. Delfosse12 , T. Forveille2 , M. Mayor1 , C. Perrier2 , D. Naef1 , and D. Queloz31 ...
V = 3 d3 = 4188.8 pc N = ρV = 0.1 pc χ 4188.8 pc = 419
... where M is the mass of the star. For what primary masses will any planets in the optimistic habitable zone be tidally locked? (Hint: Adopt the mass-luminosity relationship I showed in class to derive a relationship between the habitable zone distance and primary mass.) a) 0.11 MSun and below b) 0.25 ...
... where M is the mass of the star. For what primary masses will any planets in the optimistic habitable zone be tidally locked? (Hint: Adopt the mass-luminosity relationship I showed in class to derive a relationship between the habitable zone distance and primary mass.) a) 0.11 MSun and below b) 0.25 ...
The Luminosity
... Death of the Sun (low mass star) -10 billiion yrs: the Sun runs out of hydrogen fuel in its core. - Core is pure helium, shrinks. - Hydrogen farther out in the star gets hot enough to fuse “hydrogen shell burning” - Overall luminosity of star goes up and becomes a red giant. - 300million yrs later: ...
... Death of the Sun (low mass star) -10 billiion yrs: the Sun runs out of hydrogen fuel in its core. - Core is pure helium, shrinks. - Hydrogen farther out in the star gets hot enough to fuse “hydrogen shell burning” - Overall luminosity of star goes up and becomes a red giant. - 300million yrs later: ...
Chapter 20: Stellar Evolution: The Death of Stars PowerPoint
... Carbon Star & Its CO Shell: Photo ...
... Carbon Star & Its CO Shell: Photo ...
the summary
... The deaths of massive stars In the core of a star, hydrogen particles are fused into helium. After that, when the core contracts a bit, this helium can further fuse to heavier elements such as carbon, nitrogen and oxygen. In the most massive stars this can continue until the core consists of iron. A ...
... The deaths of massive stars In the core of a star, hydrogen particles are fused into helium. After that, when the core contracts a bit, this helium can further fuse to heavier elements such as carbon, nitrogen and oxygen. In the most massive stars this can continue until the core consists of iron. A ...
Lecture Nine (Powerpoint format) - Flash
... Sirius A/B Sirius B turns out to be an eclipsing binary, so that its radius can also be determined from the eclipse measurements. These observations revealed a highly unusual structure -- a mass about that of the sun, and a radius about that of the Earth. Sirius B became the first-known white ...
... Sirius A/B Sirius B turns out to be an eclipsing binary, so that its radius can also be determined from the eclipse measurements. These observations revealed a highly unusual structure -- a mass about that of the sun, and a radius about that of the Earth. Sirius B became the first-known white ...
Clear Skies - Cowichan Valley Starfinders Society
... them when Clear Skies has been posted to the website. To obtain Clear Skies by e-mail go to Quick Links and click on Receive Online Newsletter. It is with great honour that I carry on the torch as editor. I could never fill the shoes of my predessors, nor would I want to, each and every editor bring ...
... them when Clear Skies has been posted to the website. To obtain Clear Skies by e-mail go to Quick Links and click on Receive Online Newsletter. It is with great honour that I carry on the torch as editor. I could never fill the shoes of my predessors, nor would I want to, each and every editor bring ...
The Solar System Interplanetary Matter and the Birth of the Planets
... the collision. But we know now that collision (or near collisions) between two stars are very, very rare. Considering that collision are rare, the proposed idea of the collision may explain a unique event on how our planetary system formed but not how other planetary systems formed. During the rest ...
... the collision. But we know now that collision (or near collisions) between two stars are very, very rare. Considering that collision are rare, the proposed idea of the collision may explain a unique event on how our planetary system formed but not how other planetary systems formed. During the rest ...
Lecture 6: Multiple stars
... Amongst Solartype stars the PMS binary fraction is around 100%, compared to about 60% for MS Gdwarfs. Massive stars have a binary fraction of about 100% (they must be young). Lowmass PMS stars may have a high binary fraction, but it is low (~40%) in the field, they may have an excess at ~10 ...
... Amongst Solartype stars the PMS binary fraction is around 100%, compared to about 60% for MS Gdwarfs. Massive stars have a binary fraction of about 100% (they must be young). Lowmass PMS stars may have a high binary fraction, but it is low (~40%) in the field, they may have an excess at ~10 ...
For stars
... The Twelve constellations (some say thirteen) that the Sun moves through during the year are called the zodiac; The view of the night sky changes as Earth moves in its orbit about the Sun. As drawn here, the night side of Earth faces a different set of constellations at different times of the year. ...
... The Twelve constellations (some say thirteen) that the Sun moves through during the year are called the zodiac; The view of the night sky changes as Earth moves in its orbit about the Sun. As drawn here, the night side of Earth faces a different set of constellations at different times of the year. ...
THE CHANGING SKY
... the “Earth-centered” view, flattening your horizon (you may also do this by SLOWLY clicking on the arrow at the bottom ( 5 ), with the left mouse button until the horizon looks flat. ** On the top border of the window, you will see the letter Z (for zoom) and a number. Click (SLOWLY) on the Z with t ...
... the “Earth-centered” view, flattening your horizon (you may also do this by SLOWLY clicking on the arrow at the bottom ( 5 ), with the left mouse button until the horizon looks flat. ** On the top border of the window, you will see the letter Z (for zoom) and a number. Click (SLOWLY) on the Z with t ...
Lecture 1
... position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider two stars (C and D) that both exhibit parallax. ...
... position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider two stars (C and D) that both exhibit parallax. ...
Solutions
... Sun’s mass to have been used up. (Some of you had a fraction greater than one, which should have alarmed you.) ...
... Sun’s mass to have been used up. (Some of you had a fraction greater than one, which should have alarmed you.) ...
1B11 Foundations of Astronomy Star names and magnitudes
... 1B11 Glossary of terms - V • Vernal Equinox – The zero point for RA which is defined as the position of the Sun in the sky at the Vernal Equinox (~21 March), the point at which the Sun crosses the equator from South to North. It is also known as the “First Point of Aries” (although it is now in Pis ...
... 1B11 Glossary of terms - V • Vernal Equinox – The zero point for RA which is defined as the position of the Sun in the sky at the Vernal Equinox (~21 March), the point at which the Sun crosses the equator from South to North. It is also known as the “First Point of Aries” (although it is now in Pis ...
Lecture 11: Stars, HR diagram.
... HR diagrams for two clusters M67 (young) and M4 (old) What can we learn from this? ...
... HR diagrams for two clusters M67 (young) and M4 (old) What can we learn from this? ...
Constellation Packet - Mr. Jenkins` Classroom
... swiftly and stung orion’s foot. At the same time orion’s sword pierced the shell of scorpius and cut through to his heart. Both orion and scorpius lay dead. The gods came upon the scene and decided to honor both great warriors. They put orion in the winter sky and scorpius in the summer sky so they ...
... swiftly and stung orion’s foot. At the same time orion’s sword pierced the shell of scorpius and cut through to his heart. Both orion and scorpius lay dead. The gods came upon the scene and decided to honor both great warriors. They put orion in the winter sky and scorpius in the summer sky so they ...
The Magnitude scale
... The Magnitude scale Relative brightness on a backwards (!) log scale. Dates to Hipparchus. E.g., apparent relative luminosities of stars a & b are given by, ...
... The Magnitude scale Relative brightness on a backwards (!) log scale. Dates to Hipparchus. E.g., apparent relative luminosities of stars a & b are given by, ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.