Measuring the Properties of Stars - Sierra College Astronomy Home
... are in fact multiple star systems. Optical doubles are two stars that have small angular separation as seen from Earth but are not gravitationally linked. Binary star system is a system of two stars that are gravitationally linked so that they orbit one another. © Sierra College Astronomy Depart ...
... are in fact multiple star systems. Optical doubles are two stars that have small angular separation as seen from Earth but are not gravitationally linked. Binary star system is a system of two stars that are gravitationally linked so that they orbit one another. © Sierra College Astronomy Depart ...
Lecture12
... million years to much longer than the age of the Universe. • Stars move up the RGB when their core is contracting and the luminosity of the H burning shell is growing. • The main sequence turn off measured for a star cluster indicates the stellar mass of the most massive stars still burning H in the ...
... million years to much longer than the age of the Universe. • Stars move up the RGB when their core is contracting and the luminosity of the H burning shell is growing. • The main sequence turn off measured for a star cluster indicates the stellar mass of the most massive stars still burning H in the ...
Which of the following is the best description of an Sc galaxy? A) a
... A) they vary in brightness on a timescale of days or weeks B) they appear point-like when viewed through a telescope C) they contain black holes, which must be small D) they are too luminous to be very large Absorption lines in quasars are usually at lower redshifts. They are likely caused by A) bla ...
... A) they vary in brightness on a timescale of days or weeks B) they appear point-like when viewed through a telescope C) they contain black holes, which must be small D) they are too luminous to be very large Absorption lines in quasars are usually at lower redshifts. They are likely caused by A) bla ...
Determining the Sizes of Stars Using the HR Diagram
... the left and colder stars to the right. More luminous (intrinsically bright) stars lie at the top of the diagram and lower luminosity (intrinsically faint) stars lie at the bottom of the diagram. 5. Explain that stars are grouped into four different categories: ● Main Sequence Stars: The characteris ...
... the left and colder stars to the right. More luminous (intrinsically bright) stars lie at the top of the diagram and lower luminosity (intrinsically faint) stars lie at the bottom of the diagram. 5. Explain that stars are grouped into four different categories: ● Main Sequence Stars: The characteris ...
AST 443/PHY 517 Homework 1
... Which, if any, are observable (zenith distance <60o )? Which, if any, are above the horizon? 4. Which of these 5 stars can be observed at some time on this night from Cerro Tololo? At what times? 5. Which of these 5 stars is closest to the moon? What is the angular distance? 6. The sidereal time at ...
... Which, if any, are observable (zenith distance <60o )? Which, if any, are above the horizon? 4. Which of these 5 stars can be observed at some time on this night from Cerro Tololo? At what times? 5. Which of these 5 stars is closest to the moon? What is the angular distance? 6. The sidereal time at ...
Sky, Celestial Sphere and Constellations
... When there is turbulence in the atmosphere refraction is not uniform or steady, changes from moment to moment, changing the direction of light slightly all the time. Stars are so far away that, their angular diameters are extremely small, typically 1/100th of an arc second or less. So even a tiny ch ...
... When there is turbulence in the atmosphere refraction is not uniform or steady, changes from moment to moment, changing the direction of light slightly all the time. Stars are so far away that, their angular diameters are extremely small, typically 1/100th of an arc second or less. So even a tiny ch ...
Document
... • High Mass stars often times explode! • This spreads all of the elements Hydrogen through Iron (which makes up our planets and other new stars) and forms all elements after Iron (up to element 92- Uranium). ...
... • High Mass stars often times explode! • This spreads all of the elements Hydrogen through Iron (which makes up our planets and other new stars) and forms all elements after Iron (up to element 92- Uranium). ...
Death of Stars • Models of Star behavior can give estimates of how
... event was seen before the visible light was observed. The star was known as Sanduleak 69-202, a blue supergiant 25 times more massive than the Sun. ...
... event was seen before the visible light was observed. The star was known as Sanduleak 69-202, a blue supergiant 25 times more massive than the Sun. ...
five minute episode script
... the northwestern sky. There it is, standing on its handle – the Big Dipper. The formation of those seven bright stars is unmistakable. DEAN: Four stars make the scoop of the Big Dipper and three more make up the handle. Now where’s that Big Bear that’ll turn my asterism into a constellation? ...
... the northwestern sky. There it is, standing on its handle – the Big Dipper. The formation of those seven bright stars is unmistakable. DEAN: Four stars make the scoop of the Big Dipper and three more make up the handle. Now where’s that Big Bear that’ll turn my asterism into a constellation? ...
Death of Stars notes
... • This result supports the notion that most of the dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, since no other known mechanism could have produced nearly as much dust. • This result may provide the “missing link” between supernovas and pl ...
... • This result supports the notion that most of the dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, since no other known mechanism could have produced nearly as much dust. • This result may provide the “missing link” between supernovas and pl ...
The dying sun/ creation of elements
... Hydrogen in the core is used up. Hydrogen burns in a shell. Star becomes larger Surface becomes cooler ...
... Hydrogen in the core is used up. Hydrogen burns in a shell. Star becomes larger Surface becomes cooler ...
astronomy webquest…… explore the universe
... Stars and planets are made from gases in a __________________. The Milky Way Galaxy is approximately _______________ light years across. How much longer will our Sun last? _________________________ Lifetimes of stars range from ___________ to ____________ years. Our star orbits the centre of our gal ...
... Stars and planets are made from gases in a __________________. The Milky Way Galaxy is approximately _______________ light years across. How much longer will our Sun last? _________________________ Lifetimes of stars range from ___________ to ____________ years. Our star orbits the centre of our gal ...
The Constellations
... much like the moon is orbiting the Earth while the Earth is orbiting the Sun. This model can explain the retrograde motion of the planets, and make prediction about the position of the planets with a ...
... much like the moon is orbiting the Earth while the Earth is orbiting the Sun. This model can explain the retrograde motion of the planets, and make prediction about the position of the planets with a ...
Proxima b
... beyond our own. Almost 3500 have been discovered since the first one in 1992. But on 24 August 2016 scientists excitedly announced the discovery of Proxima b. Because it resides in our nearest neighbouring solar system it is our closest exoplanet. Furthermore, it could support life and might even pr ...
... beyond our own. Almost 3500 have been discovered since the first one in 1992. But on 24 August 2016 scientists excitedly announced the discovery of Proxima b. Because it resides in our nearest neighbouring solar system it is our closest exoplanet. Furthermore, it could support life and might even pr ...
PROBLEM SET #8 SOLUTIONS AST142 1. Free fall timescale and
... GM 2 = M σ2 2R (d) An isotropic velocity distribution has velocity dispersions in each direction that are equal σx2 = σy2 = σz2 Show that GM = 6σz2 R This is useful as we can consider σz to be the dispersion of the line of sight velocity component – and we can measure this spectroscopically using Do ...
... GM 2 = M σ2 2R (d) An isotropic velocity distribution has velocity dispersions in each direction that are equal σx2 = σy2 = σz2 Show that GM = 6σz2 R This is useful as we can consider σz to be the dispersion of the line of sight velocity component – and we can measure this spectroscopically using Do ...
Photons
... value of S λ . For the sake of comparison, the bottom panel presents the spectra of Vega (A0V), the Sun (G2V), and a M5 giant, in arbitrary scales of Fλ . ...
... value of S λ . For the sake of comparison, the bottom panel presents the spectra of Vega (A0V), the Sun (G2V), and a M5 giant, in arbitrary scales of Fλ . ...
Lecture 11
... • An alternative unit of astronomical distance is the Light Year (ly). • 1 Light Year is the distance traveled by light in one year. • 1 light year (ly) is equivalent to: – 0.31 pc ...
... • An alternative unit of astronomical distance is the Light Year (ly). • 1 Light Year is the distance traveled by light in one year. • 1 light year (ly) is equivalent to: – 0.31 pc ...
The Life Cycle of Spiral Arm Galaxies
... randomized but form the structure that drives the evolution of galaxies. In summary, as spiral arm galaxies age, the carcasses of the massive stars (black holes) accumulate. The black holes produce ...
... randomized but form the structure that drives the evolution of galaxies. In summary, as spiral arm galaxies age, the carcasses of the massive stars (black holes) accumulate. The black holes produce ...
Unit 1
... A black hole can be both very small, and have an accretion disk that can emit enough radiation Likely that at the centers of these galactic nuclei, there are supermassive black holes Intense magnetic fields in the ...
... A black hole can be both very small, and have an accretion disk that can emit enough radiation Likely that at the centers of these galactic nuclei, there are supermassive black holes Intense magnetic fields in the ...
June 2013 Kepler Space Telescope Update
... The solar system is a busy place, with five wandering planets visible to the naked eye alone. When any two pass close by each other from our point of view, we see an astronomical conjunction, but on very rare occasions, three planets will find themselves grouped together: a triple conjunction. Towar ...
... The solar system is a busy place, with five wandering planets visible to the naked eye alone. When any two pass close by each other from our point of view, we see an astronomical conjunction, but on very rare occasions, three planets will find themselves grouped together: a triple conjunction. Towar ...
AST1100 Lecture Notes
... another another possibility: spectral classes. Stars are classified according to their spectral class which consists of a letter and a number. This historical classification is based on the strength of different spectral lines found in the spectra of the stars. It turned out later that these spectra ...
... another another possibility: spectral classes. Stars are classified according to their spectral class which consists of a letter and a number. This historical classification is based on the strength of different spectral lines found in the spectra of the stars. It turned out later that these spectra ...
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.