doc - Jnoodle
... from b = L / 4d2 ) we still need the surface area A. We assume that the star is shaped like a sphere so if we find its volume V = (4/3)r3 we can get the radius of the star r and then its surface A = 4r2 (Notice the conceptual difference between the surface area of a spherical radiation source and ...
... from b = L / 4d2 ) we still need the surface area A. We assume that the star is shaped like a sphere so if we find its volume V = (4/3)r3 we can get the radius of the star r and then its surface A = 4r2 (Notice the conceptual difference between the surface area of a spherical radiation source and ...
July 2014 BRAS Newsletter - The Baton Rouge Astronomical Society
... also quantified the fraction of planets that might have been missed by their census, either because the planes of their orbits were tilted so the planets could not transit the host star as seen from Earth, or those that the TERRA software itself could have missed. Shedding (the right amount of) ligh ...
... also quantified the fraction of planets that might have been missed by their census, either because the planes of their orbits were tilted so the planets could not transit the host star as seen from Earth, or those that the TERRA software itself could have missed. Shedding (the right amount of) ligh ...
The correct answers are written in bold, italic and underlined. The
... • At the very bottom of the main sequence, massive stars being cool because of their great mass • At the very top of the main sequence, massive stars being very hot and active • In the middle of the main sequence, with very hot but less massive stars positioned higher and massive red giant stars pos ...
... • At the very bottom of the main sequence, massive stars being cool because of their great mass • At the very top of the main sequence, massive stars being very hot and active • In the middle of the main sequence, with very hot but less massive stars positioned higher and massive red giant stars pos ...
AST1100 Lecture Notes
... How do we measure the distance to distant objects in the universe? There are several methods available, most of which suffer from large uncertainties. Particularly the methods to measure the largest distances are often based on assumptions which have not been properly verified. Fortunately, we do ha ...
... How do we measure the distance to distant objects in the universe? There are several methods available, most of which suffer from large uncertainties. Particularly the methods to measure the largest distances are often based on assumptions which have not been properly verified. Fortunately, we do ha ...
Galaxies Galaxies M81
... Clusters of Galaxies Rather than occurring individually in space, galaxies are grouped in clusters ranging in size from a few dozens to thousands of galaxies. The Coma Cluster, shown at right, is 300 million light years from the Milky Way and contains more than 1,000 (and possibly as many as 10,000 ...
... Clusters of Galaxies Rather than occurring individually in space, galaxies are grouped in clusters ranging in size from a few dozens to thousands of galaxies. The Coma Cluster, shown at right, is 300 million light years from the Milky Way and contains more than 1,000 (and possibly as many as 10,000 ...
My Constellation
... horned animal at this time of the year; the horn being a symbol for fecundity, renewal, and so on. As the Sun came into this constellation, at the vernal equinox, the year itself was being renewed. Õ This point has now moved into Pisces, but the vernal equinox is still known as the First Point of Ar ...
... horned animal at this time of the year; the horn being a symbol for fecundity, renewal, and so on. As the Sun came into this constellation, at the vernal equinox, the year itself was being renewed. Õ This point has now moved into Pisces, but the vernal equinox is still known as the First Point of Ar ...
12 Introduction to Cepheid Variable Stars Exercise
... Miss Henrietta Leavitt (1868 - 1921), working at the Harvard Observatory, determined the apparent magnitude and periods of 25 cepheid variables in the Large and Small Magellanic Clouds. Miss Leavitt noted that when the cepheids were ordered by increasing period that the variable stars were also orde ...
... Miss Henrietta Leavitt (1868 - 1921), working at the Harvard Observatory, determined the apparent magnitude and periods of 25 cepheid variables in the Large and Small Magellanic Clouds. Miss Leavitt noted that when the cepheids were ordered by increasing period that the variable stars were also orde ...
Galaxy / Cluster Ecosystem Ming Sun (University of Alabama in Huntsville)
... Sun + 2007 Later more embedded coronae discovered (Yamasaki+2002; Sun+2002, 2005, 2006) and the first sample in Sun+2007 ...
... Sun + 2007 Later more embedded coronae discovered (Yamasaki+2002; Sun+2002, 2005, 2006) and the first sample in Sun+2007 ...
THE SPECTRA OF FIVE IRREGULAR VARIABLE STARS George H
... star except that the changes seem to be irregular and rather slow. Spectra were obtained on May 20 and June 3, 1950, when the variable was of visual magnitude 13. These plates show a strong emission spectrum superimposed upon a late-type absorption spectrum with moderately strong TiO bands, correspo ...
... star except that the changes seem to be irregular and rather slow. Spectra were obtained on May 20 and June 3, 1950, when the variable was of visual magnitude 13. These plates show a strong emission spectrum superimposed upon a late-type absorption spectrum with moderately strong TiO bands, correspo ...
Chapter 23 The Milky Way Galaxy
... may be understood using a traffic jam as an analogy. The jam persists even though particular cars move in and out of it, and it can persist long after the event that triggered it is over. ...
... may be understood using a traffic jam as an analogy. The jam persists even though particular cars move in and out of it, and it can persist long after the event that triggered it is over. ...
Chapter 13 (Properties of Stars)
... 24. The largest known stars. 25. Most low mass, red stars in our neighborhood. 26. Sirius B, the hot white dwarf only 1/1000th as luminous as the sun. 27. The vast majority of bright blue naked eye stars. 28. Most naked eye stars that appear red or orange in color. 29. The most massive young stars. ...
... 24. The largest known stars. 25. Most low mass, red stars in our neighborhood. 26. Sirius B, the hot white dwarf only 1/1000th as luminous as the sun. 27. The vast majority of bright blue naked eye stars. 28. Most naked eye stars that appear red or orange in color. 29. The most massive young stars. ...
Evolved Stellar Populations
... Workshop: Optical and Infrared Widefield Astronomy in Antartica Friday 16th June 2006 ...
... Workshop: Optical and Infrared Widefield Astronomy in Antartica Friday 16th June 2006 ...
Assignment 10
... b. one of the galaxies in our Local Group of galaxies c. a star with a very low surface temperature d. a quasar e. an active galaxy that is in a rich cluster of galaxies just beyond the Local Group ____ 18. Today we know that what all quasars have in common is that they appear to be small sources of ...
... b. one of the galaxies in our Local Group of galaxies c. a star with a very low surface temperature d. a quasar e. an active galaxy that is in a rich cluster of galaxies just beyond the Local Group ____ 18. Today we know that what all quasars have in common is that they appear to be small sources of ...
Chapter 15
... hydrogen and helium (and other forms of matter) clumped together by gravitational attraction to form countless trillions of stars. Billions of galaxies, each a cluster of billions of stars, now form most of the visible mass in the universe. ...
... hydrogen and helium (and other forms of matter) clumped together by gravitational attraction to form countless trillions of stars. Billions of galaxies, each a cluster of billions of stars, now form most of the visible mass in the universe. ...
PH607 – Galaxies 2
... Observed structure of the Milky Way's spiral arms As of 2005, the Milky Way is thought to comprise a large barred spiral galaxy of Hubble type SBbc (loosely wound barred spiral) with a total mass of about 1012 solar masses, comprising 200-400 billion stars. A BARRED SPIRAL: It was only in the 1980s ...
... Observed structure of the Milky Way's spiral arms As of 2005, the Milky Way is thought to comprise a large barred spiral galaxy of Hubble type SBbc (loosely wound barred spiral) with a total mass of about 1012 solar masses, comprising 200-400 billion stars. A BARRED SPIRAL: It was only in the 1980s ...
April 2011 - Skyscrapers, Inc.
... More on that a little later. Before we can observe Saturn we first must locate this planet among all the stars in the night sky. A couple of years ago Saturn was within the easily recognizable constellation of Leo. Now the sixth planet from the Sun has moved into Virgo, whose pattern of stars is not ...
... More on that a little later. Before we can observe Saturn we first must locate this planet among all the stars in the night sky. A couple of years ago Saturn was within the easily recognizable constellation of Leo. Now the sixth planet from the Sun has moved into Virgo, whose pattern of stars is not ...
Rotation in the ZAMS: Be and Bn stars
... Figure 3a shows the apparent V=7 magnitude limited counts of dwarf Be stars relative to dwarf B stars. There is an apparent lack of dwarf Be stars cooler than spectral type B7. This could be due to genuine Be stars whose discs are minute and/or too cool for the Hα emission be detectable and/or, to f ...
... Figure 3a shows the apparent V=7 magnitude limited counts of dwarf Be stars relative to dwarf B stars. There is an apparent lack of dwarf Be stars cooler than spectral type B7. This could be due to genuine Be stars whose discs are minute and/or too cool for the Hα emission be detectable and/or, to f ...
The Milky Way Galaxy (ch. 23)
... of the surface of the earth while standing within a forest. In the Galaxy case the trees are dust grains, preventing us from seeing outside our local neighborhood (at visible wavelengths or smaller). But even using light of longer wavelengths, there is a big problem: how do we get accurate distances ...
... of the surface of the earth while standing within a forest. In the Galaxy case the trees are dust grains, preventing us from seeing outside our local neighborhood (at visible wavelengths or smaller). But even using light of longer wavelengths, there is a big problem: how do we get accurate distances ...
Lecture Eleven (Powerpoint format)
... way through the treacherous ground that characterizes research at the frontiers of science." Frank Shu (contemporary astrophysicist) "As to relativity, I must confess that I would rather have a subject in which there would be a half dozen members of the Academy competent enough to understand at le ...
... way through the treacherous ground that characterizes research at the frontiers of science." Frank Shu (contemporary astrophysicist) "As to relativity, I must confess that I would rather have a subject in which there would be a half dozen members of the Academy competent enough to understand at le ...
Spectroscopy Lecture 10
... A flare star brightens by a few tenths up to a magnitude in V (more in the UV) in a few seconds, returning to its normal luminosity within a few hours ...
... A flare star brightens by a few tenths up to a magnitude in V (more in the UV) in a few seconds, returning to its normal luminosity within a few hours ...
Determining Distances to Other Galaxies
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
Chapter 1 Seeing the Light: The Art and Science of Astronomy
... creator of the atlas marks the area of the whole constellation as Canis Major and labels the individual stars α, β, and so on. When you read about a star in a list of objects to observe, say, in an astronomy magazine (see Chapter 2), you probably won’t see it listed in the style of Alpha Canis Major ...
... creator of the atlas marks the area of the whole constellation as Canis Major and labels the individual stars α, β, and so on. When you read about a star in a list of objects to observe, say, in an astronomy magazine (see Chapter 2), you probably won’t see it listed in the style of Alpha Canis Major ...
REGIONAL exam 2013
... 5. Each question is worth one point. Tiebreaker questions are indicated with a (T#) in which the number indicates the order of consultation in the event of a tie. Tiebreaker questions count toward the overall raw score, and are only used as tiebreakers when there is a tie. In such cases, (T1) will b ...
... 5. Each question is worth one point. Tiebreaker questions are indicated with a (T#) in which the number indicates the order of consultation in the event of a tie. Tiebreaker questions count toward the overall raw score, and are only used as tiebreakers when there is a tie. In such cases, (T1) will b ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.