GAIA Composition, Formation and Evolution of our Galaxy
... – 10 µas ≡ 10% at 10 kpc ≡ 1 AU at 100 kpc – 10 µas/yr at 20 kpc ≡ 1 km/s ⇒ every star in the Galaxy and Local Group will be seen to move ⇒ GAIA will quantify 6-D phase space for over 300 million stars, and 5-D phase-space for over 109 stars And an interesting data reduction challenge…. ...
... – 10 µas ≡ 10% at 10 kpc ≡ 1 AU at 100 kpc – 10 µas/yr at 20 kpc ≡ 1 km/s ⇒ every star in the Galaxy and Local Group will be seen to move ⇒ GAIA will quantify 6-D phase space for over 300 million stars, and 5-D phase-space for over 109 stars And an interesting data reduction challenge…. ...
chapter 2
... to attack the myths regarding these objects was a Greek scientist Thales (640 B:C). According to his theory the earth is flat. It floats on the ocean like a ship. The sun, the moon and the stars are balls of fire revolving around this flat earth. The idea of a flat earth was rejected by the great ph ...
... to attack the myths regarding these objects was a Greek scientist Thales (640 B:C). According to his theory the earth is flat. It floats on the ocean like a ship. The sun, the moon and the stars are balls of fire revolving around this flat earth. The idea of a flat earth was rejected by the great ph ...
Astrophysics - Part 2
... night sky is a measure of its brightness which depends on the intensity of the light received from the star. Stars were in ancient times divided into six levels of apparent magnitude. The brightest were called FIRST MAGNITUDE stars, those just visible to the unaided eye in the darkest sky, SIXTH MAG ...
... night sky is a measure of its brightness which depends on the intensity of the light received from the star. Stars were in ancient times divided into six levels of apparent magnitude. The brightest were called FIRST MAGNITUDE stars, those just visible to the unaided eye in the darkest sky, SIXTH MAG ...
CASPEC Observations of the Most Metal-Deficient Main
... shown for this star and a sequence of stars with decreasing values of [MgIH]. The stars are main-sequence turnoff stars and have about the same effective temperature as CS 22876-32 (Teff = 6000 K) according to the Strijmgren uvby-(3 photometry. The remarkable line weakness of CS 22876-32 is obvious ...
... shown for this star and a sequence of stars with decreasing values of [MgIH]. The stars are main-sequence turnoff stars and have about the same effective temperature as CS 22876-32 (Teff = 6000 K) according to the Strijmgren uvby-(3 photometry. The remarkable line weakness of CS 22876-32 is obvious ...
here - Stargazers Club
... Wobble method - an orbiting planet will pull on its star, causing it to wobble as it rotates. We can detect this wiggle in the light we receive from it Most planets found are the size of Jupiter Big dog/small dog pulling on owner is like the Earth on sun - extremely hard to detect Transit Method - a ...
... Wobble method - an orbiting planet will pull on its star, causing it to wobble as it rotates. We can detect this wiggle in the light we receive from it Most planets found are the size of Jupiter Big dog/small dog pulling on owner is like the Earth on sun - extremely hard to detect Transit Method - a ...
Einstein
... light is emitted by charged particles moving close to the speed of light around magnetic fields. • Emission (mostly radio) is concentrated at the magnetic poles and focused into a beam. • Whether we see a pulsar depends on the geometry. – if the polar beam sweeps by Earth’s direction once each rotat ...
... light is emitted by charged particles moving close to the speed of light around magnetic fields. • Emission (mostly radio) is concentrated at the magnetic poles and focused into a beam. • Whether we see a pulsar depends on the geometry. – if the polar beam sweeps by Earth’s direction once each rotat ...
Solution - Caltech Astronomy
... m A = 4.13 MŸ , mB = 0.998 MŸ . (d) Assuming the orbital separation is much larger than the stellar radii, and that the orbits are circular, we can treat the velocity of the stars during eclipse as completely in the plane of the sky. For circular orbits, the maximum radial velocities given are the c ...
... m A = 4.13 MŸ , mB = 0.998 MŸ . (d) Assuming the orbital separation is much larger than the stellar radii, and that the orbits are circular, we can treat the velocity of the stars during eclipse as completely in the plane of the sky. For circular orbits, the maximum radial velocities given are the c ...
Document
... - Estimated 1M years old - Most stars clouded from view by dust - Only 4-5 stars visible with small scope ...
... - Estimated 1M years old - Most stars clouded from view by dust - Only 4-5 stars visible with small scope ...
Properties of Supernovae
... took place about 2000 pc away, it was visible for about a month in the daytime sky. Even today the Crab supernova remnant is the brightest object in the sky at X-ray wavelengths. Optically it is fairly dim (V~10), but it is a beautiful object when imaged with large telescopes. ...
... took place about 2000 pc away, it was visible for about a month in the daytime sky. Even today the Crab supernova remnant is the brightest object in the sky at X-ray wavelengths. Optically it is fairly dim (V~10), but it is a beautiful object when imaged with large telescopes. ...
Astronomy Assignment
... ‘We are all just Star Stuff”- Carl Sagan, truer words have never been spoken. Every atom of our bodies was formed in the core of some long dead star. But how and where and why? In order to answer these questions we must understand the stars themselves and the clouds from which they arise and often a ...
... ‘We are all just Star Stuff”- Carl Sagan, truer words have never been spoken. Every atom of our bodies was formed in the core of some long dead star. But how and where and why? In order to answer these questions we must understand the stars themselves and the clouds from which they arise and often a ...
Slides from Lecture06
... • Astronomers determine the mass of a star by examining how strong the gravitational field is around that star. (Isaac Newton’s law of universal gravitation; §4-7) • By studying the motion of planets around our Sun, astronomers have determined that the Sun has a mass of 2 x 1030 kilograms. • We cann ...
... • Astronomers determine the mass of a star by examining how strong the gravitational field is around that star. (Isaac Newton’s law of universal gravitation; §4-7) • By studying the motion of planets around our Sun, astronomers have determined that the Sun has a mass of 2 x 1030 kilograms. • We cann ...
lecture11
... However, a big cold object can emit the same or more energy (depending on how big it is) than a small, hotter one ...
... However, a big cold object can emit the same or more energy (depending on how big it is) than a small, hotter one ...
Lecture 15: The Main Sequence
... temperatures lead to greater rates of nuclear fusion which means higher luminosity. Example: Low-mass Star (0.1 MSun) ...
... temperatures lead to greater rates of nuclear fusion which means higher luminosity. Example: Low-mass Star (0.1 MSun) ...
Lesson Plans - Houston ISD
... Ⓡ _SCI.8.8A Describe components of the universe including stars, nebulae and galaxies, and use models such as the Herztsprung-Russell diagram for classification. Ⓢ _SCI.8.8B Recognize that the Sun is a medium-sized star near the edge of a disc-shaped galaxy of stars and that the Sun is many thousand ...
... Ⓡ _SCI.8.8A Describe components of the universe including stars, nebulae and galaxies, and use models such as the Herztsprung-Russell diagram for classification. Ⓢ _SCI.8.8B Recognize that the Sun is a medium-sized star near the edge of a disc-shaped galaxy of stars and that the Sun is many thousand ...
Stellar Evolution
... Medium sized stars, like our sun, begin to show their age as helium builds up in the core. The helium core does not provide any energy and gravity causes the core to contract while hydrogen continues to fuse in a shell around the helium. This gravitational collapse of the core causes releases ...
... Medium sized stars, like our sun, begin to show their age as helium builds up in the core. The helium core does not provide any energy and gravity causes the core to contract while hydrogen continues to fuse in a shell around the helium. This gravitational collapse of the core causes releases ...
About SDSS - Astro Projects
... telescopes, and the longer the exposure times needed to see them. Fortunately, modern telescopes no longer need to rely on the human eye looking through an eyepiece. Instead they use electronic detectors ('CCDs') which are very similar to the chips found in ordinary digital cameras (except that inst ...
... telescopes, and the longer the exposure times needed to see them. Fortunately, modern telescopes no longer need to rely on the human eye looking through an eyepiece. Instead they use electronic detectors ('CCDs') which are very similar to the chips found in ordinary digital cameras (except that inst ...
V: 0
... The student is expected to explore how different wavelengths of the electromagnetic spectrum such as light and radio waves are used to gain information about distances and properties of components in the universe. ...
... The student is expected to explore how different wavelengths of the electromagnetic spectrum such as light and radio waves are used to gain information about distances and properties of components in the universe. ...
mass of star
... 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 forming too, but make few UV ...
... 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 forming too, but make few UV ...
stars & galaxies
... light years thick. • Our sun is located 30,000 light years from the nucleus. • It takes the sun 200 million years to make one rotation around the center. ...
... light years thick. • Our sun is located 30,000 light years from the nucleus. • It takes the sun 200 million years to make one rotation around the center. ...
Practice Questions for Final
... distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy? A. It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. B. It would mean the distance to the Andromeda Gala ...
... distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy? A. It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. B. It would mean the distance to the Andromeda Gala ...
Surveying the Stars
... • Just about anything you want to find out about a star, you can find out if it’s in an eclipsing binary system (well, maybe a slight exaggeration, but not much) ...
... • Just about anything you want to find out about a star, you can find out if it’s in an eclipsing binary system (well, maybe a slight exaggeration, but not much) ...
Contents of the Universe
... nuclei are converted into neutrons with the emission of neutrinos • Core collapse stops, neutron star is formed • Rest of the star collapses in on the core, but bounces off the new neutron star (also pushed outwards by the neutrinos) ...
... nuclei are converted into neutrons with the emission of neutrinos • Core collapse stops, neutron star is formed • Rest of the star collapses in on the core, but bounces off the new neutron star (also pushed outwards by the neutrinos) ...
Star Light, Star Bright
... brightness would equal the brightness of a full Moon.) Have students compose a four-line poem that describes how big they think the universe is. Have students include the words Earth, star, and galaxy, but not the words big or giant, in their poems. 2. Use the Activity Sheet(s) to assess student und ...
... brightness would equal the brightness of a full Moon.) Have students compose a four-line poem that describes how big they think the universe is. Have students include the words Earth, star, and galaxy, but not the words big or giant, in their poems. 2. Use the Activity Sheet(s) to assess student und ...
Notes for Unit 5
... suddenly with an outgoing shock wave. This causes the outer part of the star to explode violently; this is called a supernova. They light up entire galaxies and in the past have appeared as sudden very bright stars in our sky which quickly fade. If the star is not totally destroyed by the explosion, ...
... suddenly with an outgoing shock wave. This causes the outer part of the star to explode violently; this is called a supernova. They light up entire galaxies and in the past have appeared as sudden very bright stars in our sky which quickly fade. If the star is not totally destroyed by the explosion, ...
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.