Basics – II. Time, Magnitudes and Spectral types
... (along the celestial equator) we see a varying rate due to the projection of the ecliptic on to the celestial equator. This introduces a variation from uniform motion which is a wave of period half a year. The combination of these two effects leads to the Equation of Time (see figures). In effect, w ...
... (along the celestial equator) we see a varying rate due to the projection of the ecliptic on to the celestial equator. This introduces a variation from uniform motion which is a wave of period half a year. The combination of these two effects leads to the Equation of Time (see figures). In effect, w ...
October 2012 - astronomy for beginners
... Triangle is the rather cute little constellation of Delphinus (the Dolphin). It has a diamond shape of four stars with a line of stars trailing from the lower corner star of the diamond. Using a little imagination it does look rather like a dolphin jumping out of the water. Further to the east (left ...
... Triangle is the rather cute little constellation of Delphinus (the Dolphin). It has a diamond shape of four stars with a line of stars trailing from the lower corner star of the diamond. Using a little imagination it does look rather like a dolphin jumping out of the water. Further to the east (left ...
Although a wall looks real, solid to sight and feel, a wall is not a wall
... matter weighs as much as 200 million elephants. A teaspoon of neutronstar material would weigh a billion tons – the equivalent of 200 million elephants. (Kenneth F. Weaver, in Reader’s Digest) Old Tannenbaum: The oldest living tree on earth is believed to be a bristle cone pine in California named ...
... matter weighs as much as 200 million elephants. A teaspoon of neutronstar material would weigh a billion tons – the equivalent of 200 million elephants. (Kenneth F. Weaver, in Reader’s Digest) Old Tannenbaum: The oldest living tree on earth is believed to be a bristle cone pine in California named ...
Chapter 13 section 3
... nebula (NEB yuh luh). The pull of gravity between the particles of gas and dust causes the nebula to contract, or shrink. The nebula can break apart into smaller and smaller pieces. Each piece eventually might collapse to form a star. The particles in the smaller pieces of nebula move closer togethe ...
... nebula (NEB yuh luh). The pull of gravity between the particles of gas and dust causes the nebula to contract, or shrink. The nebula can break apart into smaller and smaller pieces. Each piece eventually might collapse to form a star. The particles in the smaller pieces of nebula move closer togethe ...
White Dwarfs - Indiana University
... Drop typically 3 mags in a month or two Back to original brightness after a few years or decades White dwarf – low mass main sequence binary Began as wider binary, then common envelope evolution tightens the binary – Recurrent novae, dwarf novae ...
... Drop typically 3 mags in a month or two Back to original brightness after a few years or decades White dwarf – low mass main sequence binary Began as wider binary, then common envelope evolution tightens the binary – Recurrent novae, dwarf novae ...
Folie 1 - univie.ac.at
... variations in stars brighter than visual magnitude 4.0 (and with less accuracy also down to a visual magnitude of 7.0). There are 534 stars brighter than V = 4.0 mag in the sky and observable at the proposed precision level with BRITE-Constellation. Considering the typical time scales for their vari ...
... variations in stars brighter than visual magnitude 4.0 (and with less accuracy also down to a visual magnitude of 7.0). There are 534 stars brighter than V = 4.0 mag in the sky and observable at the proposed precision level with BRITE-Constellation. Considering the typical time scales for their vari ...
Document
... elements present in the outer layers of the star Deduce both chemical and physical data about stars Chemical composition and surface temperature Speed and direction of motion using the Doppler Effect If source of waves is moving towards us, their frequency is shifted upwards Stars moving t ...
... elements present in the outer layers of the star Deduce both chemical and physical data about stars Chemical composition and surface temperature Speed and direction of motion using the Doppler Effect If source of waves is moving towards us, their frequency is shifted upwards Stars moving t ...
Distance Ladder
... •Typically 300 km/s or so How to to determine distances: is moving away from us at •Measure v using Doppler shift 2100 km/s? A) 1 Mly D) 484 Mly •Deduce the distance from: B) 10 Mly E) 4,840 Mly v = H0d C) 100 Mly F) 48,400 Mly ...
... •Typically 300 km/s or so How to to determine distances: is moving away from us at •Measure v using Doppler shift 2100 km/s? A) 1 Mly D) 484 Mly •Deduce the distance from: B) 10 Mly E) 4,840 Mly v = H0d C) 100 Mly F) 48,400 Mly ...
Evolution of a Star
... Once the red giant’s core uses its supply of helium, it contracts even more. As the core runs out of fuel, the outer layers escape into space. This leaves behind the hot dense core. The core contracts under the force of gravity. At this stage in a star’s evolution, it is a white dwarf. A white dwarf ...
... Once the red giant’s core uses its supply of helium, it contracts even more. As the core runs out of fuel, the outer layers escape into space. This leaves behind the hot dense core. The core contracts under the force of gravity. At this stage in a star’s evolution, it is a white dwarf. A white dwarf ...
Astronomy Webquest Part 1: Life of Stars: Go to http://www.odec.ca
... 1. If stars were the same size, then ___________________ would determine __________________. Stars would be brighter if they were____________________ and ______________________ if they were cooler than the Sun. 2. Write the hypothesis that best matches the statement above:___________________________ ...
... 1. If stars were the same size, then ___________________ would determine __________________. Stars would be brighter if they were____________________ and ______________________ if they were cooler than the Sun. 2. Write the hypothesis that best matches the statement above:___________________________ ...
SHELL H II REGIONS IN NGC 6334
... Not all the stars are in bound orbits… • In the Orion Nebula we found two young massive stars that appear to have been ejected from the same point some 500 years ago (the same age of the University of Valencia). ...
... Not all the stars are in bound orbits… • In the Orion Nebula we found two young massive stars that appear to have been ejected from the same point some 500 years ago (the same age of the University of Valencia). ...
Astronomy Homework - Life
... 38. A pulsar is a rapidly rotating neutron star that emits (a beam of light towards the Earth/radio signals at irregular intervals). 39. Neutron stars are often found in binary systems where they accumulate gas from their companion and produce (x-rays/gamma rays). 40. The mass of a neutron star cann ...
... 38. A pulsar is a rapidly rotating neutron star that emits (a beam of light towards the Earth/radio signals at irregular intervals). 39. Neutron stars are often found in binary systems where they accumulate gas from their companion and produce (x-rays/gamma rays). 40. The mass of a neutron star cann ...
The Relationship Between a Star`s Color, Temperature, and
... only 5.67 W/m2. • At 10x hotter, 1000 K, the same black body would emit 104 times as much light energy, or 56,700 W/m2. ...
... only 5.67 W/m2. • At 10x hotter, 1000 K, the same black body would emit 104 times as much light energy, or 56,700 W/m2. ...
Chapter 17 Measuring the Stars
... diagram, a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence, as this is where most stars are. Also indicated is the white dwarf region; these stars are hot but not very luminous, as they are quite s ...
... diagram, a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence, as this is where most stars are. Also indicated is the white dwarf region; these stars are hot but not very luminous, as they are quite s ...
Astrophysics notes
... A star can be analysed as a black body. By looking at the electromagnetic radiation emitted across the continuous spectrum, we can use the peak intensity wavelength (the wavelength at which the emitted radiation is at its highest peak) to determine the temperature of the star. We can use Wiens law ( ...
... A star can be analysed as a black body. By looking at the electromagnetic radiation emitted across the continuous spectrum, we can use the peak intensity wavelength (the wavelength at which the emitted radiation is at its highest peak) to determine the temperature of the star. We can use Wiens law ( ...
Physics 2028: Great Ideas in Science II: The Changing Earth Module
... 5. GMCs are usually in hydrostatic equilibrium unless some event occurs to cause a cloud to exceed its Jeans’ mass and/or Jeans’ length as described last semester. What is the trigger? Any process that can cause a stable (M < MJ ) cloudlet to become unstable (M > MJ ). a) Agglomeration: Component cl ...
... 5. GMCs are usually in hydrostatic equilibrium unless some event occurs to cause a cloud to exceed its Jeans’ mass and/or Jeans’ length as described last semester. What is the trigger? Any process that can cause a stable (M < MJ ) cloudlet to become unstable (M > MJ ). a) Agglomeration: Component cl ...
Lecture 10a Neutron Star and Black Holes (Test 2 overview)
... Crab Nebula where Chinese had recorded a supernova in 1054. First called LGM for “little green men” PHS 162 ...
... Crab Nebula where Chinese had recorded a supernova in 1054. First called LGM for “little green men” PHS 162 ...
Star Life Cycle Web Activity
... According to the relative descriptions on the online Hertzsprung-Russell Diagram, which star could best be described as very cool (3000 Kelvin) and really bright (104 luminosity). ...
... According to the relative descriptions on the online Hertzsprung-Russell Diagram, which star could best be described as very cool (3000 Kelvin) and really bright (104 luminosity). ...
Stellar Parallax
... • Stellar separations and intensities vary over many orders-of magnitude. As a result it is convenient to use logarithmic scales. • Astronomers use relative measures of Intensity. The system is based on the assumption that iVEGA = 1.0 and the apparent intensities of all other stars (i) are measured ...
... • Stellar separations and intensities vary over many orders-of magnitude. As a result it is convenient to use logarithmic scales. • Astronomers use relative measures of Intensity. The system is based on the assumption that iVEGA = 1.0 and the apparent intensities of all other stars (i) are measured ...
l`Astrofilo - Astro Publishing
... The possibilities become more interesting for the wide binary M-G star scenarios. The primary star's radiation always has a greater magnitude than that of the distant secondary star; however, there are periods where a portion of the planet would be illuminated only by light from the less photosynthe ...
... The possibilities become more interesting for the wide binary M-G star scenarios. The primary star's radiation always has a greater magnitude than that of the distant secondary star; however, there are periods where a portion of the planet would be illuminated only by light from the less photosynthe ...
Astronomy 114 – Summary of Important Concepts #2 1 Stars: key
... Q: A star has an absolute magnitude of 4 and lies 1 parsec from the Earth. Suppose that star is moved to a distance of 10 parsecs from the Sun. What is its absolute magnitude? A: The absolute magnitude is still 4. Absolute magnitude does not depend on distance. It measures the luminosity of the star ...
... Q: A star has an absolute magnitude of 4 and lies 1 parsec from the Earth. Suppose that star is moved to a distance of 10 parsecs from the Sun. What is its absolute magnitude? A: The absolute magnitude is still 4. Absolute magnitude does not depend on distance. It measures the luminosity of the star ...
ASTR 1120 General Astronomy: Stars and Galaxies
... Ptolemy Broke Stars into 5 magnitude groups m=1 the brightest, m=5 the faintest In 1700’s it was found this was a logarithmic scale, as that is how the naked eye responds. Also, faintest were about 100x fainter than brightest. Break the factor of 100 into 5 equal factors: ...
... Ptolemy Broke Stars into 5 magnitude groups m=1 the brightest, m=5 the faintest In 1700’s it was found this was a logarithmic scale, as that is how the naked eye responds. Also, faintest were about 100x fainter than brightest. Break the factor of 100 into 5 equal factors: ...
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.