The Planetarium Fleischmann Planetarium
... LEFT: A visible-light image of a debris disk around the red dwarf star AU Microscopii. Planets may be forming, or might already exist, within it. The disk glows in starlight reflected by tiny grains of dust created by the collisions of asteroids and comets. Because it is composed of the pulverized r ...
... LEFT: A visible-light image of a debris disk around the red dwarf star AU Microscopii. Planets may be forming, or might already exist, within it. The disk glows in starlight reflected by tiny grains of dust created by the collisions of asteroids and comets. Because it is composed of the pulverized r ...
2900 K micrometers T
... (photospheres) of the stars. Use our on-line laboratory spectra of different gases; we call these “comparison spectra”: http://www.radiochemistry.org/periodictable/gas_spectra/index.html (this site is also linked from our course web site on the “Homework” page). (a) Which of the three basic types of ...
... (photospheres) of the stars. Use our on-line laboratory spectra of different gases; we call these “comparison spectra”: http://www.radiochemistry.org/periodictable/gas_spectra/index.html (this site is also linked from our course web site on the “Homework” page). (a) Which of the three basic types of ...
A Tale of Two (Solar) Telescopes: something old, something
... triple system has two solar-like stars separated by about Sun-Saturn distance, and a dim red dwarf about 10,000 au away (toward us). System is slightly metal rich compared with Sun, and slightly older by ~1 Gyr. The G2 V primary (“Alpha Cen A”) is a near twin of our own star. ...
... triple system has two solar-like stars separated by about Sun-Saturn distance, and a dim red dwarf about 10,000 au away (toward us). System is slightly metal rich compared with Sun, and slightly older by ~1 Gyr. The G2 V primary (“Alpha Cen A”) is a near twin of our own star. ...
For stars
... Earth’s Orbital Motion 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 diffe ...
... Earth’s Orbital Motion 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 diffe ...
neutrino
... Fusion!in!the!Sun! • Protons!are!posi;vely!charged,!and!things!with! the!same!charges!repel!each!other! • So!how!do!protons!manage!to!fuse!together?! • Must!collide!at!very!high!speeds,!to!get!close! enough!for!the!strong%nuclear%force%to!take!over! • This!is!why!fusion!can!only!happen!at!very! ...
... Fusion!in!the!Sun! • Protons!are!posi;vely!charged,!and!things!with! the!same!charges!repel!each!other! • So!how!do!protons!manage!to!fuse!together?! • Must!collide!at!very!high!speeds,!to!get!close! enough!for!the!strong%nuclear%force%to!take!over! • This!is!why!fusion!can!only!happen!at!very! ...
PowerPoint slides
... Iron spectral lines can be analyzed using the gravitational red-shift to determine the gravitational strength and from this, how compact the object is. There is matter orbiting as close as 160 km - only six times bigger than the Schwarzschild radius. ...
... Iron spectral lines can be analyzed using the gravitational red-shift to determine the gravitational strength and from this, how compact the object is. There is matter orbiting as close as 160 km - only six times bigger than the Schwarzschild radius. ...
Black Holes - University of Oregon
... would fail and nothing would oppose gravitational collapse. The core would therefore collapse into an object known as a singularity. A singularity is an object with a radius of zero and therefore, since it has a finite mass, its density is infinite. Well, that’s just not right, is it? First, let’s c ...
... would fail and nothing would oppose gravitational collapse. The core would therefore collapse into an object known as a singularity. A singularity is an object with a radius of zero and therefore, since it has a finite mass, its density is infinite. Well, that’s just not right, is it? First, let’s c ...
How Close is our Nearest Neighbor
... law so that their luminosities could be determined by measuring their periods of variation. These variable stars have been found in other galaxies, including our nearest neighbors. Introduction: Cepheid variable stars are simply stars whose brightness varies regularly. They are called Cepheids becau ...
... law so that their luminosities could be determined by measuring their periods of variation. These variable stars have been found in other galaxies, including our nearest neighbors. Introduction: Cepheid variable stars are simply stars whose brightness varies regularly. They are called Cepheids becau ...
6 March 2013 Exoplanets and Where to Find Them Professor
... imaging (eg with adaptive optics) it is possible to separate the light from the planet from that of the host. This technique was used to obtain the first image of a multiplanet system in 2007. Four planets are seen to orbit HR 8799, an ordinary star fairly similar to our Sun and some 130 light-years ...
... imaging (eg with adaptive optics) it is possible to separate the light from the planet from that of the host. This technique was used to obtain the first image of a multiplanet system in 2007. Four planets are seen to orbit HR 8799, an ordinary star fairly similar to our Sun and some 130 light-years ...
1. setting the scene 2. the cosmic dark ages and the first stars
... that, in order to balance the enormous force of gravity, such stars have to burn their nuclear fuel at very high temperatures. The first consequence is that a star with a mass 10–100 times the mass of the Sun shines most brightly in ultraviolet light. Such radiation is powerful enough the ionise the ...
... that, in order to balance the enormous force of gravity, such stars have to burn their nuclear fuel at very high temperatures. The first consequence is that a star with a mass 10–100 times the mass of the Sun shines most brightly in ultraviolet light. Such radiation is powerful enough the ionise the ...
Stellar Astrophysics: Introduction Q. Daniel Wang Astronomy Department University of Massachusetts
... Stars are mostly steady, spending most of their lifetime converting H into He. Mostly forces are balanced between gravity - only the mass within r matters and acts as if it is at the center of a star (the gravitational potential is different). I pressure - most importantly its differences between th ...
... Stars are mostly steady, spending most of their lifetime converting H into He. Mostly forces are balanced between gravity - only the mass within r matters and acts as if it is at the center of a star (the gravitational potential is different). I pressure - most importantly its differences between th ...
Determination of spiral orbits with constant tangential velocity
... In the animation, the velocity distribution is shown with red lines as a function of the radius. The lines are interrupted by green pixels. The lower part of the lines corresponds to the tangential component of the velocity, and the entire line equals the total rate which is composed of tangential a ...
... In the animation, the velocity distribution is shown with red lines as a function of the radius. The lines are interrupted by green pixels. The lower part of the lines corresponds to the tangential component of the velocity, and the entire line equals the total rate which is composed of tangential a ...
The Fate of the X-ray Emitting Gas in the Early
... the AGN and increasing blueshifted velocities near the AGN. This suggests that these GMAs are falling into the AGN from the far side of the galaxy. The velocity gradient of GMA 18 is perpendicular to that expected for a disk rotating about the AGN. ...
... the AGN and increasing blueshifted velocities near the AGN. This suggests that these GMAs are falling into the AGN from the far side of the galaxy. The velocity gradient of GMA 18 is perpendicular to that expected for a disk rotating about the AGN. ...
2012 New York State Science Olympiad Astronomy
... b. Calculate the distance in parsecs to this hypothetical star, if it appears to have a magnitude of 10. Do not account for interstellar extinction (3 points).4 ...
... b. Calculate the distance in parsecs to this hypothetical star, if it appears to have a magnitude of 10. Do not account for interstellar extinction (3 points).4 ...
Some interesting geometric facts about eclipsing binaries (see if you
... Some interesting geometric facts about eclipsing binaries (see if you can prove these): The probability of a binary being properly oriented in space for us to observe it as an eclipsing system becomes progressively smaller as the distance between the two stars increases. It turns out that no visual ...
... Some interesting geometric facts about eclipsing binaries (see if you can prove these): The probability of a binary being properly oriented in space for us to observe it as an eclipsing system becomes progressively smaller as the distance between the two stars increases. It turns out that no visual ...
The Southern Winter PDF
... spiral galaxies throughout the Universe. However, the view towards the center of our galaxy (middle, marked) and its lurking supermassive black hole is obscured at visible wavelengths and difficult to interpret. Most of the light in this spectacular scene, 34 by 20 degrees across, comes from the myr ...
... spiral galaxies throughout the Universe. However, the view towards the center of our galaxy (middle, marked) and its lurking supermassive black hole is obscured at visible wavelengths and difficult to interpret. Most of the light in this spectacular scene, 34 by 20 degrees across, comes from the myr ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... based on their light curves, that is, their pattern of rising and falling brightness. Later, they found these types actually corresponded to different physical circumstances triggering the explosions. Even those types have fine distinctions based on their spectra, giving rise to the categorization o ...
... based on their light curves, that is, their pattern of rising and falling brightness. Later, they found these types actually corresponded to different physical circumstances triggering the explosions. Even those types have fine distinctions based on their spectra, giving rise to the categorization o ...
Dynamic
... collapse by non-linear non-spherical oscillations cannot be universal. When the size of the body approaches gravitational radius, no stabilization is possible at any γ . Nevertheless, the nonlinear stabilization may occur at larger radii, so after damping of the oscillations the star would collapse ...
... collapse by non-linear non-spherical oscillations cannot be universal. When the size of the body approaches gravitational radius, no stabilization is possible at any γ . Nevertheless, the nonlinear stabilization may occur at larger radii, so after damping of the oscillations the star would collapse ...
July 2013 - Skyscrapers, Inc.
... size as the Earth. There we go again, thinking globally. They are cooler than the adjacent surface of the Sun. They travel slowly across the Sun in groups. They are on an 11 year cycle of heightened activity. Also, they are magnetized. And, just for good measure, they change their polarity every 11 ...
... size as the Earth. There we go again, thinking globally. They are cooler than the adjacent surface of the Sun. They travel slowly across the Sun in groups. They are on an 11 year cycle of heightened activity. Also, they are magnetized. And, just for good measure, they change their polarity every 11 ...
... variation of the ultraviolet (UV) radiation from its star, in cases where the atmosphere contains a high concentration of oxygen has been studied by Segura et al. (2010). However is likely that potentially habitable planets around other stars have an atmosphere with high concentrations of carbon dio ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.