White Dwarfs and the age of the Universe
... the fate of white dwarfs • WD is hot • Emits light from surface • surface is small, cools off slowly • cooling rate depends only on temperature (since size can’t change) • as WD cools off, rate of cooling goes down ...
... the fate of white dwarfs • WD is hot • Emits light from surface • surface is small, cools off slowly • cooling rate depends only on temperature (since size can’t change) • as WD cools off, rate of cooling goes down ...
Lesson 3: Calculating distances to stars
... from a given parallax angle or vice versa. The distances to stars can’t always be calculated from the parallax method. If the star is very far away, then the brightness of the star can be used to estimate the distance to the star. It is a rather simple principle; if a star is close by then it will a ...
... from a given parallax angle or vice versa. The distances to stars can’t always be calculated from the parallax method. If the star is very far away, then the brightness of the star can be used to estimate the distance to the star. It is a rather simple principle; if a star is close by then it will a ...
to get the file
... •First notice the graph of the background subtracted from the Aldebaran’s intensity without a filter or polarizer in place and a 1 ...
... •First notice the graph of the background subtracted from the Aldebaran’s intensity without a filter or polarizer in place and a 1 ...
The Night Sky
... smaller magnitude while fainter stars have a larger magnitude. The brightest star, Sirius has a magnitude –1.4 The faintest stars visible to the unaided eye have a magnitude of about 6. ...
... smaller magnitude while fainter stars have a larger magnitude. The brightest star, Sirius has a magnitude –1.4 The faintest stars visible to the unaided eye have a magnitude of about 6. ...
Amanda Boyle Starstuff
... The types are best remembered using the following mimetic: Oh Be A Fine Girl Kiss Me. Can you tell that astronomers consist of mainly lonely and hopelessly romantic men? O type stars are the most luminous and hottest, the smoking ...
... The types are best remembered using the following mimetic: Oh Be A Fine Girl Kiss Me. Can you tell that astronomers consist of mainly lonely and hopelessly romantic men? O type stars are the most luminous and hottest, the smoking ...
4-6 Script
... The stars in the Pleiades are hard to miss despite the small space they occupy in the night sky (together, they kind of look like a short-handled little dipper). They shine so bright and vivid that cultures the world over have adopted them into their culture. Try to imagine some of the age old shape ...
... The stars in the Pleiades are hard to miss despite the small space they occupy in the night sky (together, they kind of look like a short-handled little dipper). They shine so bright and vivid that cultures the world over have adopted them into their culture. Try to imagine some of the age old shape ...
HOU Supernova Light Curves
... Type II supernovas occur in regions with lots of bright, young stars, such as the spiral arms of galaxies. They apparently do not occur in elliptical galaxies, which are dominated by old, low-mass stars. Since bright young stars are typically stars with masses greater than about 10 times the mass o ...
... Type II supernovas occur in regions with lots of bright, young stars, such as the spiral arms of galaxies. They apparently do not occur in elliptical galaxies, which are dominated by old, low-mass stars. Since bright young stars are typically stars with masses greater than about 10 times the mass o ...
SUMMARY White dwarfs, neutron stars, and black holes are the
... in an accretion disk. What type of photons have this wavelength? 10. (15.1–15.3) You observe a main sequence K0type star that moves as if it is in a binary system, but no companion is visible. If the period of the system is 34 days and the semimajor axis is 0.5 AU, what is the mass of the system (r ...
... in an accretion disk. What type of photons have this wavelength? 10. (15.1–15.3) You observe a main sequence K0type star that moves as if it is in a binary system, but no companion is visible. If the period of the system is 34 days and the semimajor axis is 0.5 AU, what is the mass of the system (r ...
Investigating Supernova Remnants - Chandra X
... can occupy any single energy state; this is called the Pauli Exclusion Principle. In a normal gas, this is not a problem – there are not enough electrons floating around to completely fill up all the energy states. In a white dwarf, all of the electrons are forced close together, and all the energy ...
... can occupy any single energy state; this is called the Pauli Exclusion Principle. In a normal gas, this is not a problem – there are not enough electrons floating around to completely fill up all the energy states. In a white dwarf, all of the electrons are forced close together, and all the energy ...
Open Houses at the Campus Observatory Astronomical Horizons Lecture
... The sun becomes degenerate The sun loses too much mass as a planetary nebula It takes too long to burn neon. ...
... The sun becomes degenerate The sun loses too much mass as a planetary nebula It takes too long to burn neon. ...
The double-degenerate, super-Chandrasekhar nucleus of the
... The most striking result is the total mass of the system, which amounts to 1.76 M⊙ . This mass is above the Chandrasekhar limit without any ambiguity, even when considering the lowest mass allowed within the confidence range (1.5 M⊙ ). This is, to our knowledge, the first unequivocal determination o ...
... The most striking result is the total mass of the system, which amounts to 1.76 M⊙ . This mass is above the Chandrasekhar limit without any ambiguity, even when considering the lowest mass allowed within the confidence range (1.5 M⊙ ). This is, to our knowledge, the first unequivocal determination o ...
PPTX
... During the day, the Sun moves from east to west across the sky. In which direction do the stars move after the Sun has set? (A) The stars are stationary; they don't move (B) West (C) East ...
... During the day, the Sun moves from east to west across the sky. In which direction do the stars move after the Sun has set? (A) The stars are stationary; they don't move (B) West (C) East ...
GEARS Workshop Monday - Georgia Southern University
... So… high mass stars should have lots more hydrogen to fuse than low mass stars • How come high mass stars fuse hydrogen for so much less time? ...
... So… high mass stars should have lots more hydrogen to fuse than low mass stars • How come high mass stars fuse hydrogen for so much less time? ...
Stellar Temperature & Luminosity Student Page Purpose
... 1. If the peak in the black body curve of a star is at a longer wavelength than the peak wavelength for our Sun, how does the surface temperature of that star compare to our Sun’s surface temperature? 2. Which of the following events will have the largest effect on a star’s brightness — doubling its ...
... 1. If the peak in the black body curve of a star is at a longer wavelength than the peak wavelength for our Sun, how does the surface temperature of that star compare to our Sun’s surface temperature? 2. Which of the following events will have the largest effect on a star’s brightness — doubling its ...
1 2 3 4 5 6 Orbital Distance (AU) Orbital Period (Years) 1 2 3 4 5 6 7
... it were to move from being close to the central star to being much farther away? b.) decrease c.) stay the same ...
... it were to move from being close to the central star to being much farther away? b.) decrease c.) stay the same ...
The formation of stars and planets
... Outer radius of Strömgren sphere: where all photons are used up, i.e. where LN(r)=0. ...
... Outer radius of Strömgren sphere: where all photons are used up, i.e. where LN(r)=0. ...
Time From the Perspective of a Particle Physicist
... For heavy white dwarves with a companion star • acquire mass, if becomes > 1.4 M(Sun) SUPERNOVA (Ia). p + e n + neutrino • Usually leaves neutron star For high mass stars • fusion continues beyond C,O to Iron • if Mass(core) > 1.4 M(Sun) core collapses in SUPERNOVA (II) • leaves either Neutron Sta ...
... For heavy white dwarves with a companion star • acquire mass, if becomes > 1.4 M(Sun) SUPERNOVA (Ia). p + e n + neutrino • Usually leaves neutron star For high mass stars • fusion continues beyond C,O to Iron • if Mass(core) > 1.4 M(Sun) core collapses in SUPERNOVA (II) • leaves either Neutron Sta ...
Stellar Evolution: Evolution: Birth, Life, and Death of Stars
... outside colder part by radiation, convection or conduction. If the energy flows out of the star, the star will cool - unless more energy is created inside. ...
... outside colder part by radiation, convection or conduction. If the energy flows out of the star, the star will cool - unless more energy is created inside. ...
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.