lecture25
... Radar ranging - good for measuring distances in the solar system (up to about 0.0001 light years) Parallax - good for measuring distances to a few hundred light years ...
... Radar ranging - good for measuring distances in the solar system (up to about 0.0001 light years) Parallax - good for measuring distances to a few hundred light years ...
Quantum Well Electron Gain Structures and Infrared
... • We need to find temperatures in this range (at least part of the time) • How common is that? ...
... • We need to find temperatures in this range (at least part of the time) • How common is that? ...
charts_set_9
... - at least 30 kpc across - contains globular clusters, old stars, little gas and dust, much "dark matter" - roughly spherical ...
... - at least 30 kpc across - contains globular clusters, old stars, little gas and dust, much "dark matter" - roughly spherical ...
Exploring The Universe
... because the gravitational pull of nearby galaxies distorts their spiral arms. • Contain mostly YOUNG STARS ...
... because the gravitational pull of nearby galaxies distorts their spiral arms. • Contain mostly YOUNG STARS ...
July 2014 BRAS Newsletter - The Baton Rouge Astronomical Society
... the constellation Cygnus, monitoring their brightness photometrically every 30 minutes for four years. It was searching for any minute decreases in brightness that might indicate one or more planets transiting (passing in front of) their host star as seen from Earth. (For comparison, if Earth transi ...
... the constellation Cygnus, monitoring their brightness photometrically every 30 minutes for four years. It was searching for any minute decreases in brightness that might indicate one or more planets transiting (passing in front of) their host star as seen from Earth. (For comparison, if Earth transi ...
Stars
... means that gravity is acting in the opposite direction, forcing particles towards the core. ...
... means that gravity is acting in the opposite direction, forcing particles towards the core. ...
Measuring the Properties of Stars (ch. 17)
... The only method for directly determining the masses of stars is from binary stars, using Newton’s form of Kepler’s 3rd law. There are three types of binary stars, which depend on how close they are to each other, their relative brightnesses, the distance of the binary, and other factors: a.Visual bi ...
... The only method for directly determining the masses of stars is from binary stars, using Newton’s form of Kepler’s 3rd law. There are three types of binary stars, which depend on how close they are to each other, their relative brightnesses, the distance of the binary, and other factors: a.Visual bi ...
Celestial Distances
... Summary (cont’d) For distant stars that are not variable and don’t have a nearby variable star, use the temperature - luminosity relation of the H-R diagram. Does require some work to determine if the star is main sequence, dwarf, or giant. Later we will see the use of red shift and supernovae ...
... Summary (cont’d) For distant stars that are not variable and don’t have a nearby variable star, use the temperature - luminosity relation of the H-R diagram. Does require some work to determine if the star is main sequence, dwarf, or giant. Later we will see the use of red shift and supernovae ...
7.4 Evolution on the Main-Sequence Main-sequence (m
... very short compared to the m-s phase. Hence very few stars are found in this final phase of m-s evolution. As H is exhausted, the star establishes a H-burning shell source around the core. The m-s lifetime τm−s ∝ M/L and since L ∝ M 3 , then τm−s ∝ M −2 . Massive stars have m-s lifetimes of a few mi ...
... very short compared to the m-s phase. Hence very few stars are found in this final phase of m-s evolution. As H is exhausted, the star establishes a H-burning shell source around the core. The m-s lifetime τm−s ∝ M/L and since L ∝ M 3 , then τm−s ∝ M −2 . Massive stars have m-s lifetimes of a few mi ...
The First Stars - Amazon Web Services
... than white dwarfs. So much energy is released in this final collapse that a huge explosion blows off the outer layers of the star. This is a supernova explosion. The light released in this immense explosion heralding the death throes of a massive star is about that of the luminosity of an entire gal ...
... than white dwarfs. So much energy is released in this final collapse that a huge explosion blows off the outer layers of the star. This is a supernova explosion. The light released in this immense explosion heralding the death throes of a massive star is about that of the luminosity of an entire gal ...
G W ORIONIS, A 20000 YEARS OLD T TAURI STAR? 1\/"", _ 0.14
... Our knowledge 01' the actual ages 01' very young stars is very meager; the first indication Lhat we may be observing stars with ages 01' the onler 01' 10 000 years came indirectly from the analysis 01' the density distribution in the Orion nebula (Kahn am! Menon ]9(1) which showed that the latter co ...
... Our knowledge 01' the actual ages 01' very young stars is very meager; the first indication Lhat we may be observing stars with ages 01' the onler 01' 10 000 years came indirectly from the analysis 01' the density distribution in the Orion nebula (Kahn am! Menon ]9(1) which showed that the latter co ...
ASTR 220 Homework #7 Solutions
... 100,000 light-years across. Even if we could send out a probe that traveled at the speed of light, it would take thousands of years for it to get far enough away to see the whole galaxy at once. We have no pictures of the Milky Way from the “outside”. 9. Ch. 14, Sensible Statements, #24. This statem ...
... 100,000 light-years across. Even if we could send out a probe that traveled at the speed of light, it would take thousands of years for it to get far enough away to see the whole galaxy at once. We have no pictures of the Milky Way from the “outside”. 9. Ch. 14, Sensible Statements, #24. This statem ...
Sirius Astronomer - Orange County Astronomers
... Eris (dwarf planet) – I reported here last month that the material on the surface of Eris was found to be almost identical to that on Pluto. It was assumed by planetary astronomers that the interior of Eris should be almost identical to Pluto, since they should have formed in the same way in the sam ...
... Eris (dwarf planet) – I reported here last month that the material on the surface of Eris was found to be almost identical to that on Pluto. It was assumed by planetary astronomers that the interior of Eris should be almost identical to Pluto, since they should have formed in the same way in the sam ...
uniview glossary - DMNS Galaxy Guide Portal
... composed of highly dense gaseous hydrogen and helium, with a metal hydrogen mantle, but a very small inner core, hence the phrase “Gas Giant.” The average distance from the Sun is 4.9 AU. Saturn: (Greek-Cronus); also the father of Jupiter in mythology) The day, Saturday, is named after the planet ...
... composed of highly dense gaseous hydrogen and helium, with a metal hydrogen mantle, but a very small inner core, hence the phrase “Gas Giant.” The average distance from the Sun is 4.9 AU. Saturn: (Greek-Cronus); also the father of Jupiter in mythology) The day, Saturday, is named after the planet ...
The Cosmic Near-Infrared Background: Remnant light form
... Image credit: Robert Hurt, SSC, JPL, CalTech, NASA ‘T’he first stars may have lighted up the cosmos within 200 to 400 million years after the Big Bang, and then clustered together into ...
... Image credit: Robert Hurt, SSC, JPL, CalTech, NASA ‘T’he first stars may have lighted up the cosmos within 200 to 400 million years after the Big Bang, and then clustered together into ...
A Absolute Magnitude A scale for measuring the actual
... The point in the orbit of the Moon or other satellite where it is farthest from the Earth. Apparent Magnitude The apparent brightness of an object in the sky as it appears to an observer on Earth. Bright objects have a low apparent magnitude while dim objects will have a higher apparent magnitude. A ...
... The point in the orbit of the Moon or other satellite where it is farthest from the Earth. Apparent Magnitude The apparent brightness of an object in the sky as it appears to an observer on Earth. Bright objects have a low apparent magnitude while dim objects will have a higher apparent magnitude. A ...
OCR Physics A Refer to the Physics A datasheet for data, formulae
... Calculate the maximum and minimum values for the wavelength of this line due to the stars’ orbital motion. ...
... Calculate the maximum and minimum values for the wavelength of this line due to the stars’ orbital motion. ...
Measuring The Parallax of Barnard's Star
... Subject headings: Parallax, Barnard’s Star, Parsec, Astronomical Unit Barnard’s Star is one of the closest stars to us. It is also the star that has the fastest apparent motion across the sky moving about 11 arcseconds per year. With a right ascension of 17h 53m 26s, it reaches opposition on the nig ...
... Subject headings: Parallax, Barnard’s Star, Parsec, Astronomical Unit Barnard’s Star is one of the closest stars to us. It is also the star that has the fastest apparent motion across the sky moving about 11 arcseconds per year. With a right ascension of 17h 53m 26s, it reaches opposition on the nig ...
Giant Molecular Clouds and Gravitational Stability
... • Taurus (dist ≈ 140 pc, size ≈ 30 pc, mass ≈104 M): Only low mass stars (~105), quiet slow star formation, mostly isolated star formation. • Ophiuchus (dist ≈ 140 pc, size ≈ 6 pc, mass ≈ 104 M): Low mass stars (~78), strongly clustered in western core (stellar density 50 stars/pc), high star form ...
... • Taurus (dist ≈ 140 pc, size ≈ 30 pc, mass ≈104 M): Only low mass stars (~105), quiet slow star formation, mostly isolated star formation. • Ophiuchus (dist ≈ 140 pc, size ≈ 6 pc, mass ≈ 104 M): Low mass stars (~78), strongly clustered in western core (stellar density 50 stars/pc), high star form ...
Test 3 Version 3 1. Milky Way halo stars follow: (a) differential
... A have been proven to exist by direct observation, i.e. we can see the black hole itself B probably do not exist C may be inferred to exist from observations in the last few decades D can be produced in the laboratory ...
... A have been proven to exist by direct observation, i.e. we can see the black hole itself B probably do not exist C may be inferred to exist from observations in the last few decades D can be produced in the laboratory ...
PARALLAX EXERCISE1 The goal of this exercise is to introduce the
... experiment above. How does the parallax (the apparent shift of the position of your finger) change as your finger is moved closer to your ...
... experiment above. How does the parallax (the apparent shift of the position of your finger) change as your finger is moved closer to your ...
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.