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... this is why they appear red to our eyes. This color is also seen in red giant stars which are larger in size and they are still colder. Station 3: Blue (Sirius & Vega) ...
... this is why they appear red to our eyes. This color is also seen in red giant stars which are larger in size and they are still colder. Station 3: Blue (Sirius & Vega) ...
Model of Stars—6 Oct Test 1: Average 17 (75%) •
... The luminosity of a star (the energy produced every second) depends on temperature and size. What can I do to make the same hot-plate at the same setting burn my hand and not burn my hand? (Without modifying the sun, what can I do to make the sun brighter or fainter?) A. B. ...
... The luminosity of a star (the energy produced every second) depends on temperature and size. What can I do to make the same hot-plate at the same setting burn my hand and not burn my hand? (Without modifying the sun, what can I do to make the sun brighter or fainter?) A. B. ...
Lecture 31: The Properties of Stars
... of stars. The color of a star depends on its temperature: cooler stars are redder, hotter stars are blue. Luminosity, the total energy output expressed in Watts or Solar Luminosities, depends on the radius and temperature. The absorption spectra of stars form a distinct sequence with stellar tempera ...
... of stars. The color of a star depends on its temperature: cooler stars are redder, hotter stars are blue. Luminosity, the total energy output expressed in Watts or Solar Luminosities, depends on the radius and temperature. The absorption spectra of stars form a distinct sequence with stellar tempera ...
Neutron Stars
... more than 4.6 billion years ago, whose remains were swept up into the solar system when the Sun formed ...
... more than 4.6 billion years ago, whose remains were swept up into the solar system when the Sun formed ...
The Size and Structure of the Milky Way Galaxy
... Dark Matter: A Major Problem for Contemporary Physics and Astronomy • Stars are a small fraction of the mass of major galaxies • The dark matter problem becomes more pronounced as you go out in the universe • The form of the dark matter is unknown; probably not what you studied in chemistry • Possi ...
... Dark Matter: A Major Problem for Contemporary Physics and Astronomy • Stars are a small fraction of the mass of major galaxies • The dark matter problem becomes more pronounced as you go out in the universe • The form of the dark matter is unknown; probably not what you studied in chemistry • Possi ...
Astronomy In the News Parallax Class demos: Parallax
... Brad and Angelina are two stars that have the same apparent brightness. Brad has a larger parallactic angle than Angelina. Which star is more luminous? ...
... Brad and Angelina are two stars that have the same apparent brightness. Brad has a larger parallactic angle than Angelina. Which star is more luminous? ...
Colonization of the Milky Way The distances between the stars are
... Colonization of the Milky Way The distances between the stars are huge. However, our galaxy has existed for more than ten billion years, so does the time or the distance win? An easy way to see that the time is triumphant is to note that a speed of 30 km/s, comparable to the fastest spacecraft our s ...
... Colonization of the Milky Way The distances between the stars are huge. However, our galaxy has existed for more than ten billion years, so does the time or the distance win? An easy way to see that the time is triumphant is to note that a speed of 30 km/s, comparable to the fastest spacecraft our s ...
ASTR 300 Stars and Stellar Systems Spring 2011
... The Schwarzschild radius is RS = 3M for M in solar masses and RS in km (p 298). Thus for the galactic center black hole we find RS = 1.2 × 107 km. Converting to AU we get RS = (1.2 × 107 km)/(1.5 × 108 km/AU ) = 0.080 AU. (This is only about 17 R⊙, smaller than most giant stars!) Now the period P is ...
... The Schwarzschild radius is RS = 3M for M in solar masses and RS in km (p 298). Thus for the galactic center black hole we find RS = 1.2 × 107 km. Converting to AU we get RS = (1.2 × 107 km)/(1.5 × 108 km/AU ) = 0.080 AU. (This is only about 17 R⊙, smaller than most giant stars!) Now the period P is ...
Chapter 30 Notes
... galaxy a collection of stars, dust, and gas bound together by gravity • Galaxies are the major building blocks of the universe. Astronomers estimate that the universe contains hundreds of billions of galaxies. • A typical galaxy, such as the Milky Way, has a diameter of bout 100,000 light-years and ...
... galaxy a collection of stars, dust, and gas bound together by gravity • Galaxies are the major building blocks of the universe. Astronomers estimate that the universe contains hundreds of billions of galaxies. • A typical galaxy, such as the Milky Way, has a diameter of bout 100,000 light-years and ...
The Hubble Redshift Distance Relation
... During the early part of the twentieth century, an astronomer by the name of Vesto Slipher discovered that the spectra of galaxies indicated that most of them were moving away from our Galaxy. By noting the shift of characteristic lines towards the red end of the spectrum, he surmised that most gala ...
... During the early part of the twentieth century, an astronomer by the name of Vesto Slipher discovered that the spectra of galaxies indicated that most of them were moving away from our Galaxy. By noting the shift of characteristic lines towards the red end of the spectrum, he surmised that most gala ...
Life cycle of low mass stars
... more massive. Created by the massive collapse of a red supergiant. Earth would be the size of a football field and weigh 100 million tons High temperature but not very bright. Gravity > internal pressure Option 2: 6b. Black hole Black hole = objects smaller and more dense than Neutron stars. Created ...
... more massive. Created by the massive collapse of a red supergiant. Earth would be the size of a football field and weigh 100 million tons High temperature but not very bright. Gravity > internal pressure Option 2: 6b. Black hole Black hole = objects smaller and more dense than Neutron stars. Created ...
The Solar System and its Place in the Galaxy
... The local density of stars in the solar neighborhood is about 0.11 pc^-3, though many of the stars are in binary or multiple star systems. The local density of binary and multiple star systems is 0.086 pc^-3. Most of these are low-mass stars, less massive and less luminous than the Sun. The nearest ...
... The local density of stars in the solar neighborhood is about 0.11 pc^-3, though many of the stars are in binary or multiple star systems. The local density of binary and multiple star systems is 0.086 pc^-3. Most of these are low-mass stars, less massive and less luminous than the Sun. The nearest ...
Aug 2015 supplement - Hermanus Astronomy
... erupting black hole. On 15 June, NASA’s Swift satellite detected the start of a new outburst from V404 Cygni, where a black hole and a Sun-like star orbit each other. Since then, astronomers around the world have been monitoring the ongoing light show. Astronomers say the rings result from an ‘echo’ ...
... erupting black hole. On 15 June, NASA’s Swift satellite detected the start of a new outburst from V404 Cygni, where a black hole and a Sun-like star orbit each other. Since then, astronomers around the world have been monitoring the ongoing light show. Astronomers say the rings result from an ‘echo’ ...
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... 1. Type I: hydrogen poor, formed from the detonation of a carbon white dwarf 2. Type II: hydrogen rich, formed by the implosion-explosion of the core of a massive star (core-collapse supernova) ...
... 1. Type I: hydrogen poor, formed from the detonation of a carbon white dwarf 2. Type II: hydrogen rich, formed by the implosion-explosion of the core of a massive star (core-collapse supernova) ...
Spectroscopy – the study of the colors of light (the spectrum) given
... The width of the spectral line seen in the spectra of stars is determined by the density of the gas producing the light. The densities of these gases is less for a red giant and more for a white dwarf. ...
... The width of the spectral line seen in the spectra of stars is determined by the density of the gas producing the light. The densities of these gases is less for a red giant and more for a white dwarf. ...
The Magnitude System
... The Magnitude System The magnitude system is invented by Hipparchus in 120 BC, and is still used today, although the magnitude scale itself is not a meaningful “physical quantity” (it is just a scale). Initially this system was arbitrary because Hipparchus decided that all the brightest and most bea ...
... The Magnitude System The magnitude system is invented by Hipparchus in 120 BC, and is still used today, although the magnitude scale itself is not a meaningful “physical quantity” (it is just a scale). Initially this system was arbitrary because Hipparchus decided that all the brightest and most bea ...
AS2001 - University of St Andrews
... Near centre of galaxy: Shorter orbit period--> More passes thru spiral shocks --> More star generations --> m lower --> Z higher. (Also, more infall of IGM on outskirts.) ...
... Near centre of galaxy: Shorter orbit period--> More passes thru spiral shocks --> More star generations --> m lower --> Z higher. (Also, more infall of IGM on outskirts.) ...
March 2016 BRAS Addendum Newsletter
... Sirius (Alpha CMa), “scorching”, “the Dog Star”, mag. -1.46, 06 45 09.25 -16 42 47.3, is a blue-white binary star, and is also the brightest star in the night sky. The companion star, Sirius B (the Pup),is a white dwarf star with a magnitude of 8.4, and has an orbital period of 50 years and a separa ...
... Sirius (Alpha CMa), “scorching”, “the Dog Star”, mag. -1.46, 06 45 09.25 -16 42 47.3, is a blue-white binary star, and is also the brightest star in the night sky. The companion star, Sirius B (the Pup),is a white dwarf star with a magnitude of 8.4, and has an orbital period of 50 years and a separa ...
Lecture 9
... The time spent in a particular evolutionary phase is related to the number of stars of that type we see in the sky of that type. (although you have to be careful) When the Sun is an AGB star, its envelope will extend out to the orbit of Mars, the H-fusion shell will reach the orbit of the former ...
... The time spent in a particular evolutionary phase is related to the number of stars of that type we see in the sky of that type. (although you have to be careful) When the Sun is an AGB star, its envelope will extend out to the orbit of Mars, the H-fusion shell will reach the orbit of the former ...
Guess The Spectra!!
... of stars, gas clouds, and nebulae. Therefore the spectra of a galaxy is the combination of all of these pieces! Can you ...
... of stars, gas clouds, and nebulae. Therefore the spectra of a galaxy is the combination of all of these pieces! Can you ...
chapter 14 - Astronomy
... 1. The core of a main sequence star has a regulating mechanism (just like a thermostat) that controls the rate of consumption of hydrogen fuel. 2. The overall effect of the mechanism is that nuclear fusion proceeds at a rate that is just enough to keep the star in hydrostatic equilibrium. Main Sequ ...
... 1. The core of a main sequence star has a regulating mechanism (just like a thermostat) that controls the rate of consumption of hydrogen fuel. 2. The overall effect of the mechanism is that nuclear fusion proceeds at a rate that is just enough to keep the star in hydrostatic equilibrium. Main Sequ ...
Lecture 22 - Seattle Central
... Option 1) Planetary nebulae on steroids…. Supernova remnants: A large fraction of the star’s mass, chemically enriched with elements up to and BEYOND iron, back into space. SN1006 about 60ly across. ...
... Option 1) Planetary nebulae on steroids…. Supernova remnants: A large fraction of the star’s mass, chemically enriched with elements up to and BEYOND iron, back into space. SN1006 about 60ly across. ...
The cosmic distance scale
... One of the standard candles is a rare type of variable star called a Cepheid. These stars are very luminous, which is good since this makes it possible to observe them from a fairly large distance. Using the HST, individual Cepheids can be resolved as far away as the Virgo cluster of galaxies. Cephe ...
... One of the standard candles is a rare type of variable star called a Cepheid. These stars are very luminous, which is good since this makes it possible to observe them from a fairly large distance. Using the HST, individual Cepheids can be resolved as far away as the Virgo cluster of galaxies. Cephe ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.