20_LectureOutline
... 20.2 Evolution of a Sun-Like Star The helium flash: The pressure within the helium core is almost totally due to “electron degeneracy”—two electrons cannot be in the same quantum state, so the core cannot contract beyond a certain point. This pressure is almost independent of temperature— when the ...
... 20.2 Evolution of a Sun-Like Star The helium flash: The pressure within the helium core is almost totally due to “electron degeneracy”—two electrons cannot be in the same quantum state, so the core cannot contract beyond a certain point. This pressure is almost independent of temperature— when the ...
The Milky Way - University of North Texas
... Note that the following lectures include animations and PowerPoint effects such as ...
... Note that the following lectures include animations and PowerPoint effects such as ...
The Evening Sky Map
... Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in ...
... Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in ...
Practice Exam for 3 rd Astronomy Exam
... The Roman numeral in HII means that one electron has been removed from the hydrogen atom. Thus HII is hydrogen with its only electron removed creating a positive hydrogen ion. HI is regular neutral hydrogen with no electrons removed. You cannot have HIII because that would mean that 2 electrons have ...
... The Roman numeral in HII means that one electron has been removed from the hydrogen atom. Thus HII is hydrogen with its only electron removed creating a positive hydrogen ion. HI is regular neutral hydrogen with no electrons removed. You cannot have HIII because that would mean that 2 electrons have ...
What is a white dwarf?
... White dwarfs are the leftover cores of dead stars, usually made mostly of carbon (some are made mostly of helium; others of oxygen or other elements heavier than carbon, up to and including iron). Their name comes from the fact they are 'born' glowing whitehot with high temperatures (remember ...
... White dwarfs are the leftover cores of dead stars, usually made mostly of carbon (some are made mostly of helium; others of oxygen or other elements heavier than carbon, up to and including iron). Their name comes from the fact they are 'born' glowing whitehot with high temperatures (remember ...
Your Star: _____________________ Write down the wavelength at which the one
... the purposes of this exercise a rough estimate is sufficient. Once you have determined the luminosity and temperature of each star, please go to the board and plot that star on the class H-R (temperature-luminosity) diagram. Calculating the radius and spectral type is optional, but strongly encourag ...
... the purposes of this exercise a rough estimate is sufficient. Once you have determined the luminosity and temperature of each star, please go to the board and plot that star on the class H-R (temperature-luminosity) diagram. Calculating the radius and spectral type is optional, but strongly encourag ...
What is a white dwarf?
... White dwarfs are the leftover cores of dead stars, usually made mostly of carbon (some are made mostly of helium; others of oxygen or other elements heavier than carbon, up to and including iron). Their name comes from the fact they are 'born' glowing white-hot with high temperatures (remember that ...
... White dwarfs are the leftover cores of dead stars, usually made mostly of carbon (some are made mostly of helium; others of oxygen or other elements heavier than carbon, up to and including iron). Their name comes from the fact they are 'born' glowing white-hot with high temperatures (remember that ...
starwalk2 manual en - Vito Technology Inc.
... The highlighted parameter will start changing accordingly. To make any parameter elapse automatically, tap one of them and drag the Time slider. The map sky will rotate. In order to stop that, tap the Time slider again. To return to the current time zone, tap ...
... The highlighted parameter will start changing accordingly. To make any parameter elapse automatically, tap one of them and drag the Time slider. The map sky will rotate. In order to stop that, tap the Time slider again. To return to the current time zone, tap ...
Sting of the Scorpion
... Take identical twins, they say. These should, according to astrological logic, have identical tendencies, life styles and lives, but most do not. And the researchers raise other disturbing questions. So, I am tempted to ask, where lies the truth? Can you really use the zodiac to personal advantage? ...
... Take identical twins, they say. These should, according to astrological logic, have identical tendencies, life styles and lives, but most do not. And the researchers raise other disturbing questions. So, I am tempted to ask, where lies the truth? Can you really use the zodiac to personal advantage? ...
Pp 263-266 - Gravity From The Ground Up
... who is receding from a source of light at this speed. This will produce a lengthening of the wavelength of the light by at least a factor of two. If astronomers could see spectral lines in the radiation from a neutron star, they should be strongly redshifted. These numbers can only be approximately ...
... who is receding from a source of light at this speed. This will produce a lengthening of the wavelength of the light by at least a factor of two. If astronomers could see spectral lines in the radiation from a neutron star, they should be strongly redshifted. These numbers can only be approximately ...
Stellar Evolution in the HR Diagram
... • During the AGB phase, large amount of dust are created in the star’s atmosphere. This dust gets ejected into space during the TPAGB phase and can enshroud the star (at least in the optical). As a result, TP-AGB stars can be extremely bright in the near and mid-IR. • Because of dredge-up, the rel ...
... • During the AGB phase, large amount of dust are created in the star’s atmosphere. This dust gets ejected into space during the TPAGB phase and can enshroud the star (at least in the optical). As a result, TP-AGB stars can be extremely bright in the near and mid-IR. • Because of dredge-up, the rel ...
Chapter 15 Surveying the Stars
... • Any star that varies significantly in brightness with time is called a variable star • Some stars vary in brightness because they cannot achieve proper balance between power welling up from the core and power radiated from the surface • Such a star alternately expands and contracts, varying in bri ...
... • Any star that varies significantly in brightness with time is called a variable star • Some stars vary in brightness because they cannot achieve proper balance between power welling up from the core and power radiated from the surface • Such a star alternately expands and contracts, varying in bri ...
Chapter 12 Stellar Evolution
... straight line; it stays at just about the same luminosity as it cools off. • Eventually, the star dies in a violent explosion called a supernova. ...
... straight line; it stays at just about the same luminosity as it cools off. • Eventually, the star dies in a violent explosion called a supernova. ...
Document
... • The scenario that leads to nova explosions can produce an even wilder phenomenon. • In the early 1900s `novae’ were sometimes observed in other galaxies and were used to help set the distances to galaxies. • But, when it became clear that even the nearest galaxies were much further away than anyon ...
... • The scenario that leads to nova explosions can produce an even wilder phenomenon. • In the early 1900s `novae’ were sometimes observed in other galaxies and were used to help set the distances to galaxies. • But, when it became clear that even the nearest galaxies were much further away than anyon ...
6 March 2013 Exoplanets and Where to Find Them Professor
... a debris disc of cool matter. The disc is seen edge-on, and extends some 3,000 AU across. The distribution of its material appears asymmetrical: rings mark structures with different concentrations at 500-800 AU away from the star, and the inner parts of the disc are inclined at about 5° relative to ...
... a debris disc of cool matter. The disc is seen edge-on, and extends some 3,000 AU across. The distribution of its material appears asymmetrical: rings mark structures with different concentrations at 500-800 AU away from the star, and the inner parts of the disc are inclined at about 5° relative to ...
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 ( ...
The Mighty Hunter in the Winter Sky By Shannon Jackson
... Five constellations are always in our northern sky. Other groupings appear seasonally, and then disappear as they fall below the horizon. There are five constellations, however, which seem to circle Polaris (po LAR us), also known as the North Star. The North Star always stays put while the other st ...
... Five constellations are always in our northern sky. Other groupings appear seasonally, and then disappear as they fall below the horizon. There are five constellations, however, which seem to circle Polaris (po LAR us), also known as the North Star. The North Star always stays put while the other st ...
Time From the Perspective of a Particle Physicist
... • Stars “move” East to West over the course of one Night (in circle about the North Star) • Stars “move” East to West by 2 hours per month and “return” to the same position after one Year • It’s just caused by Earth’s daily spin and yearly orbit about the Sun • Star wheel depends on latitude: northe ...
... • Stars “move” East to West over the course of one Night (in circle about the North Star) • Stars “move” East to West by 2 hours per month and “return” to the same position after one Year • It’s just caused by Earth’s daily spin and yearly orbit about the Sun • Star wheel depends on latitude: northe ...
Astronomy 112: The Physics of Stars Class 18 Notes: Neutron Stars
... our understanding of the equation of state of neutronized matter at nuclear densities is far from perfect – this is not an area where we can really do laboratory experiments! C. Magnetic fields As we discussed a moment ago, one important property of neutron stars is that they are superconductors, i. ...
... our understanding of the equation of state of neutronized matter at nuclear densities is far from perfect – this is not an area where we can really do laboratory experiments! C. Magnetic fields As we discussed a moment ago, one important property of neutron stars is that they are superconductors, i. ...
Contents ISP 205 Section 2 Study Guide for Test 3 28 March 2007
... 15. Why are elements with 12, 16, 20, 24, 28 nuclei more abundant in the universe? They are made by adding helium4 to the parent nucleus. 16. When will the earth be too hot for humans? In 1-4Byr, when sun is still a MS star. ...
... 15. Why are elements with 12, 16, 20, 24, 28 nuclei more abundant in the universe? They are made by adding helium4 to the parent nucleus. 16. When will the earth be too hot for humans? In 1-4Byr, when sun is still a MS star. ...
Star of Bethlehem
In Christian tradition, the Star of Bethlehem, also called the Christmas Star, revealed the birth of Jesus to the Biblical Magi, and later led them to Bethlehem. The star appears only in the nativity story of the Gospel of Matthew, where astrologers from the east are inspired by the star to travel to Jerusalem. There they meet King Herod of Judea, and ask where the king of the Jews had been born. Herod, following a verse from the Book of Micah interpreted as a prophecy, directs them to Bethlehem, to the south of Jerusalem. The star leads them to Jesus' home in the town, where they worship him and give him gifts. The wise men are then given a divine warning not to return to Herod so they return home by a different route.Many Christians see the star as a miraculous sign to mark the birth of the Christ (or messiah). Some theologians claimed that the star fulfilled a prophecy, known as the Star Prophecy. Astronomers have made several attempts to link the star to unusual astronomical events, such as a conjunction of Jupiter and Saturn, a comet or a supernova.Many modern scholars do not consider the story to be describing a historical event but a pious fiction created by the author of the Gospel of Matthew.The subject is a favorite at planetarium shows during the Christmas season, although the Biblical account describes Jesus with a broader Greek word, which can mean either ""infant"" or ""child"" (paidon), rather than the more specific word for infant (brephos), possibly implying that some time has passed since the birth. The visit is traditionally celebrated on Epiphany (January 6) in Western Christianity.