White Dwarfs and Neutron Stars
... • Neutron stars can form powerful jets of matter and energy • Previously only thought possible with black holes • Binary system with neutron star gaining matter from white dwarf companion’s atmosphere in an accretion disk • Neutron star is tiny compared to white dwarf but is very dense and about 14 ...
... • Neutron stars can form powerful jets of matter and energy • Previously only thought possible with black holes • Binary system with neutron star gaining matter from white dwarf companion’s atmosphere in an accretion disk • Neutron star is tiny compared to white dwarf but is very dense and about 14 ...
Powerpoint
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
... fusion shells, it is generating so much energy that radiation pressure from the high energy light trying to get out of the star pushes away the envelope, exposing the very hot core. The ultraviolet radiation from the core ionizes and heats the expelled envelope, causing it to glow like our gas lamps ...
... fusion shells, it is generating so much energy that radiation pressure from the high energy light trying to get out of the star pushes away the envelope, exposing the very hot core. The ultraviolet radiation from the core ionizes and heats the expelled envelope, causing it to glow like our gas lamps ...
If you wish to a copy of this months Night Sky News
... sequence stars, about twice the size of the sun. They can be separated with a good small telescope. Castor B is now also known to be a spectroscopic binary whose components are even closer, at only 4.5 million km distance and having an orbital period of only three days. A distant 9th mag. companion ...
... sequence stars, about twice the size of the sun. They can be separated with a good small telescope. Castor B is now also known to be a spectroscopic binary whose components are even closer, at only 4.5 million km distance and having an orbital period of only three days. A distant 9th mag. companion ...
Supernovae – the biggest bangs since the Big Bang
... However, if matter passes to the white dwarf star and it becomes more than 40 percent “heavier” than the Sun, it will make a huge explosion. The entire white dwarf will explode with the energy of four billion Suns. This is called a “white dwarf supernova” (also known as a “Type Ia supernova”). Im ...
... However, if matter passes to the white dwarf star and it becomes more than 40 percent “heavier” than the Sun, it will make a huge explosion. The entire white dwarf will explode with the energy of four billion Suns. This is called a “white dwarf supernova” (also known as a “Type Ia supernova”). Im ...
The Sun is a mass of Incandescent Gas
... stars until it reaches its main sequence stage (see small stars, stages 1-4). The stars shine steadily until the hydrogen has fused to form helium ( it takes billions of years in a small star, but only millions in a massive star). ...
... stars until it reaches its main sequence stage (see small stars, stages 1-4). The stars shine steadily until the hydrogen has fused to form helium ( it takes billions of years in a small star, but only millions in a massive star). ...
Introduction to Astronomy
... If you measure a star's apparent magnitude and know its absolute magnitude, you can find the star's distance (using the inverse square law of light brightness). If you know a star's apparent magnitude and distance, you can find the star's luminosity A star can be luminous because it is hot or it is ...
... If you measure a star's apparent magnitude and know its absolute magnitude, you can find the star's distance (using the inverse square law of light brightness). If you know a star's apparent magnitude and distance, you can find the star's luminosity A star can be luminous because it is hot or it is ...
What is the Zodiac? The Zodiac is defined by 12 constellations
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
Sermon Notes
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
... Claudius Ptolemy of Alexandria (90 – 168 AD) was a Greek astronomer who borrowed his information from the ancient Babylonian texts and he listed the 48 constellations that are recognized as the Zodiac. The IAU (International Astronomical Union) established in 1919 has identified 88 constellations. T ...
Astronomy 103 – Midterm 2 – October 29, 2014
... 24. Once the luminosity of a star is known, what has to be measured in order to find the star’s radius? a) parallax angle to find distance b) color to find distance c) color to find surface temperature d) parallax angle to find surface temperature ...
... 24. Once the luminosity of a star is known, what has to be measured in order to find the star’s radius? a) parallax angle to find distance b) color to find distance c) color to find surface temperature d) parallax angle to find surface temperature ...
Teacher Guide - Astronomy Outreach at UT Austin
... “Our galaxy, by conservative estimates, contains 100 billion stars. The small number of stars we can see at night are the nearby stars in our tiny neighborhood of our galaxy. Stars are not eternal, but live long lives compared to our lifetime. Over time they change. Just like you can look at a famil ...
... “Our galaxy, by conservative estimates, contains 100 billion stars. The small number of stars we can see at night are the nearby stars in our tiny neighborhood of our galaxy. Stars are not eternal, but live long lives compared to our lifetime. Over time they change. Just like you can look at a famil ...
A Star is “Born,” and then How Will it Move
... Young (Embedded) Clusters: Very young (<10 Myr-old) groups of young stars that form together. Future binding depends on cluster mass & velocity, seems that 90% dissolve before ~10 Myr (Lada & Lada 2003). When they unbind but are still seen to move together, they’re known as a “stellar association.” ...
... Young (Embedded) Clusters: Very young (<10 Myr-old) groups of young stars that form together. Future binding depends on cluster mass & velocity, seems that 90% dissolve before ~10 Myr (Lada & Lada 2003). When they unbind but are still seen to move together, they’re known as a “stellar association.” ...
Planetary Configurations
... • Photons “random walk” or diffuse from core to photosphere. This occurs as atoms and electrons absorb and scatter (bounce) the photons. • Aside from energy, photons also possess momentum, and so they give an outward “kick” against gravity as they work out. • If strong enough, sum of kicks can excee ...
... • Photons “random walk” or diffuse from core to photosphere. This occurs as atoms and electrons absorb and scatter (bounce) the photons. • Aside from energy, photons also possess momentum, and so they give an outward “kick” against gravity as they work out. • If strong enough, sum of kicks can excee ...
Lecture 19 Review
... and dust is blown off in the process. This all happens in 100,000 years. The sun arrives on the main sequence of the H&R diagram where it will burns hydrogen stably for 10 billion years. Lacking hydrogen fuel in the core, the core collapses while a shell of hydrogen continues to burn around the core ...
... and dust is blown off in the process. This all happens in 100,000 years. The sun arrives on the main sequence of the H&R diagram where it will burns hydrogen stably for 10 billion years. Lacking hydrogen fuel in the core, the core collapses while a shell of hydrogen continues to burn around the core ...
a Supernova!
... 1. The force of gravity is roughly constant as you fall, because your distance from the center of the Earth changes very little. So you accelerate steadily. 2. Eventually, air resistance becomes important and sets a limiting ‘terminal velocity.’( A parachute helps to make that a ...
... 1. The force of gravity is roughly constant as you fall, because your distance from the center of the Earth changes very little. So you accelerate steadily. 2. Eventually, air resistance becomes important and sets a limiting ‘terminal velocity.’( A parachute helps to make that a ...
Two Dissipating Exoplanet Atmospheres Taken from: Hubble
... Unlike the planet HD 209458b, WASP-12b is essentially being accreted onto its stellar neighbor. It is superheated to 2,800°F (1,538°C) and stretched into a football shape by the enormous gravitational tidal forces induced in it by its nearby star. Its outer material is being stripped away, spiraling ...
... Unlike the planet HD 209458b, WASP-12b is essentially being accreted onto its stellar neighbor. It is superheated to 2,800°F (1,538°C) and stretched into a football shape by the enormous gravitational tidal forces induced in it by its nearby star. Its outer material is being stripped away, spiraling ...
Astronomy practice questions for 3-6 test
... 4. Is the Andromeda galaxy red or blue shifted? __________________________________________________________ 5. According to Hubble’s law, which galaxy or planet is moving fastest away from the nearby star? __________________________________________________________ 6. Which galaxy or planet is moving ...
... 4. Is the Andromeda galaxy red or blue shifted? __________________________________________________________ 5. According to Hubble’s law, which galaxy or planet is moving fastest away from the nearby star? __________________________________________________________ 6. Which galaxy or planet is moving ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.