Spectroscopy Lecture 10
... – Found Sirius B at Northwestern’s Dearborn Observatory Procyon B found in 1895 at Lick – Was it a star that had cooled and dimmed? Spectrum of 40 Eri B observed – an A star! – It must be hot – Must have small radius to be so faint – The first “w hite dwarf” Adams found Sirius B is also an A star ...
... – Found Sirius B at Northwestern’s Dearborn Observatory Procyon B found in 1895 at Lick – Was it a star that had cooled and dimmed? Spectrum of 40 Eri B observed – an A star! – It must be hot – Must have small radius to be so faint – The first “w hite dwarf” Adams found Sirius B is also an A star ...
Astronomy 15 - Problem Set Number 4 1) Suppose one were to
... These electrons are accelerated to strike yet another piece of metal, the process is repeated until the original photoelectron has been multiplied by a million times or more. This results in an easily detectable pulse of electric current corresponding to the original photon. Photomultipliers therefo ...
... These electrons are accelerated to strike yet another piece of metal, the process is repeated until the original photoelectron has been multiplied by a million times or more. This results in an easily detectable pulse of electric current corresponding to the original photon. Photomultipliers therefo ...
Stellar parallax-aberration is geocentric
... for starlight and might be expected to heat up too much over cosmological time. This same objection was brought to bear against Le Sagean type gravity. The answer to both is: that the earth was created to last for 7,000 years and not billions. If, indeed, parallax cannot be separated then we must wo ...
... for starlight and might be expected to heat up too much over cosmological time. This same objection was brought to bear against Le Sagean type gravity. The answer to both is: that the earth was created to last for 7,000 years and not billions. If, indeed, parallax cannot be separated then we must wo ...
Properties of Ellipticals and Spirals
... Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrounding it – Halo is random. Spiral galaxies are flattened by rotation (el ...
... Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrounding it – Halo is random. Spiral galaxies are flattened by rotation (el ...
1.3 Lifecycle of stars
... The Death of a Low-Mass Star As the white dwarf cools, its size does not change significantly; it simply gets dimmer and dimmer, and finally ceases to glow. ...
... The Death of a Low-Mass Star As the white dwarf cools, its size does not change significantly; it simply gets dimmer and dimmer, and finally ceases to glow. ...
Nebulae - Innovative Teachers BG
... are stellar clusters. The Galactic Stellar Clusters have a relatively small number (a few hundreds) of bright hot stars. These astronomical objects are observed in the spirals of the galactic plane and are realtively young – hundred millions years. Oposite to them are Globular Clusters found as a ru ...
... are stellar clusters. The Galactic Stellar Clusters have a relatively small number (a few hundreds) of bright hot stars. These astronomical objects are observed in the spirals of the galactic plane and are realtively young – hundred millions years. Oposite to them are Globular Clusters found as a ru ...
Lecture 16
... A. Yes, because the Sun is about halfway through its hydrogen-burning life, so it has turned about half its core ...
... A. Yes, because the Sun is about halfway through its hydrogen-burning life, so it has turned about half its core ...
S1-4-03 - Celestial Navigation
... Part C: Movement of the Stars Northern Circumpolar Constellations Show students the northern circumpolar constellations. Note that depending on where you live, some constellations are visible all year round and some constellations are seasonal. If you live in the Northern Hemisphere, the constellati ...
... Part C: Movement of the Stars Northern Circumpolar Constellations Show students the northern circumpolar constellations. Note that depending on where you live, some constellations are visible all year round and some constellations are seasonal. If you live in the Northern Hemisphere, the constellati ...
Star Planet - Stony Brook Astronomy
... 3000 yr to counts all the stars in the MW, one per second ...
... 3000 yr to counts all the stars in the MW, one per second ...
Galaxies and the Universe
... it is 1/0.77= 1.3 parsecs away. • Sense of scale: – If you make a model where the distance between the Earth and the Sun (1 AU) is an inch, then one light-year is a mile. One parsec is 3.26 miles. – The size of our galaxy, the Milky Way, is about 100,000 ly across…. That’s ~31 thousand parsecs [31 k ...
... it is 1/0.77= 1.3 parsecs away. • Sense of scale: – If you make a model where the distance between the Earth and the Sun (1 AU) is an inch, then one light-year is a mile. One parsec is 3.26 miles. – The size of our galaxy, the Milky Way, is about 100,000 ly across…. That’s ~31 thousand parsecs [31 k ...
July - Magic Valley Astronomical Society
... tant Heinrich L. d'Arrest observed the planet very near to their predicted locations on Sept. 23, 1846. What followed Two other features were discovered by Voyager 2. There was an international dispute, with both the English and the was an additional, smaller dark spot in the southern hemiFrench see ...
... tant Heinrich L. d'Arrest observed the planet very near to their predicted locations on Sept. 23, 1846. What followed Two other features were discovered by Voyager 2. There was an international dispute, with both the English and the was an additional, smaller dark spot in the southern hemiFrench see ...
Why does Sirius twinkle?
... constellation of Orion rise high in the sky with a very bright companion in a nearby constellation: Sirius - The Dog Star. ...
... constellation of Orion rise high in the sky with a very bright companion in a nearby constellation: Sirius - The Dog Star. ...
11 - Visual Magnitudes Project
... Attached is a finding chart for the brighter stars in the open star cluster named Praesepe or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is ...
... Attached is a finding chart for the brighter stars in the open star cluster named Praesepe or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is ...
Scientific Results Summary
... The search for planets outside our Solar System motivates much of modern astronomy. Although over 270 planets have been found through indirect methods, being the first to directly image an extrasolar planet is one of the primary goals of Subaru. This year, astronomers discovered an unusual extrasola ...
... The search for planets outside our Solar System motivates much of modern astronomy. Although over 270 planets have been found through indirect methods, being the first to directly image an extrasolar planet is one of the primary goals of Subaru. This year, astronomers discovered an unusual extrasola ...
5 Understanding stars and star ClUsters
... some even thousands, of stars. These stars are still bound together gravitationally and move together in an elaborate dance as they circle the galaxy. These groups of stars are what we see as open clusters. They typically have little defined form and can contain from a few to thousands of stars. Som ...
... some even thousands, of stars. These stars are still bound together gravitationally and move together in an elaborate dance as they circle the galaxy. These groups of stars are what we see as open clusters. They typically have little defined form and can contain from a few to thousands of stars. Som ...
Class II Supernova
... Stars with anywhere from 3-9 solar masses have hydrogen in their core. When the hydrogen combines with the helium, it produces thermal energy. This is how the star is maintained. When the star runs out or stops producing hydrogen the thermal energy doesn’t maintain the star anymore. ...
... Stars with anywhere from 3-9 solar masses have hydrogen in their core. When the hydrogen combines with the helium, it produces thermal energy. This is how the star is maintained. When the star runs out or stops producing hydrogen the thermal energy doesn’t maintain the star anymore. ...
1B11 Foundations of Astronomy Star names and magnitudes
... [email protected] www.ucl.ac.uk/webct www.mssl.ucl.ac.uk/ ...
... [email protected] www.ucl.ac.uk/webct www.mssl.ucl.ac.uk/ ...
JimH This is Your Life - The Atlanta Astronomy Club
... Everyday examples of convection are boiling water. ...
... Everyday examples of convection are boiling water. ...
September 2011 - Newbury Astronomical Society
... All the usual advice given to beginners to astronomy applies. That is: dress to keep warm, make yourself comfortable and avoid lights that shine directly into your face. Little needs to be said about dressing to keep warm except to start observing in warm clothes and don’t wait until cold has set in ...
... All the usual advice given to beginners to astronomy applies. That is: dress to keep warm, make yourself comfortable and avoid lights that shine directly into your face. Little needs to be said about dressing to keep warm except to start observing in warm clothes and don’t wait until cold has set in ...
The cosmological distance ladder
... can get an estimate the galaxy's distance using Hubble's Law (V = H0 d) with a 10% uncertainty due to the peculiar velocity. At a redshift of 3 percent the speed of light (9000 km/sec), the effect of any perturbations on the galaxy's motion are correspondingly smaller ...
... can get an estimate the galaxy's distance using Hubble's Law (V = H0 d) with a 10% uncertainty due to the peculiar velocity. At a redshift of 3 percent the speed of light (9000 km/sec), the effect of any perturbations on the galaxy's motion are correspondingly smaller ...
ASTRONOMY 301 EXAMPLES OF TEST
... furniture at room temperature. Which of these statements would be wrong? (A) If you dove into a swimming pool full of water and opened your eyes under water, you would see the Sun as a brilliant light above the water. (B) The inside of a refrigerator would look black, but people would glow. (C) A ro ...
... furniture at room temperature. Which of these statements would be wrong? (A) If you dove into a swimming pool full of water and opened your eyes under water, you would see the Sun as a brilliant light above the water. (B) The inside of a refrigerator would look black, but people would glow. (C) A ro ...
Lecture19
... All stars: As H is burned up in core, it leaves behind He “ash”. When H is used up, core begins contracting, and H is burned in a shell around the core. Star’s outer layers expand, cooling and getting much brighter, becoming a Red Giant star. Eventually core contracts enough to become so hot it can ...
... All stars: As H is burned up in core, it leaves behind He “ash”. When H is used up, core begins contracting, and H is burned in a shell around the core. Star’s outer layers expand, cooling and getting much brighter, becoming a Red Giant star. Eventually core contracts enough to become so hot it can ...
Chapter 6 Stars
... explosion is called a supernova. After a supernova, some of the material from the star expands into space. This material may become part of a nebula. This nebula can then contract to form a new, partly recycled star. Astronomers think the sun began as a nebula that contained material from a supernov ...
... explosion is called a supernova. After a supernova, some of the material from the star expands into space. This material may become part of a nebula. This nebula can then contract to form a new, partly recycled star. Astronomers think the sun began as a nebula that contained material from a supernov ...
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.