22 September: Starlight
... • Spectral lines give chemical composition, temperature (also), speed of rotation (How?) and other properties • Examples of stellar spectra…what can we say? ...
... • Spectral lines give chemical composition, temperature (also), speed of rotation (How?) and other properties • Examples of stellar spectra…what can we say? ...
In class Review Notes(5-20-14)
... Q 22: Distance is measured in space with: Light years 1 light year equals around 6 trillion miles. ...
... Q 22: Distance is measured in space with: Light years 1 light year equals around 6 trillion miles. ...
PRE-LAB
... (behind you); WEST is to you left and EAST is to your right. The height of the POLE STAR (or any star) above the HORIZON is called ALTITUDE. This is basically an imaginary line drawn from the HORIZON to the POLE STAR. Although it looks like a line, it is actually an angle. Recall that distances on t ...
... (behind you); WEST is to you left and EAST is to your right. The height of the POLE STAR (or any star) above the HORIZON is called ALTITUDE. This is basically an imaginary line drawn from the HORIZON to the POLE STAR. Although it looks like a line, it is actually an angle. Recall that distances on t ...
Lecture 9: Hydrostatic Equilibrium
... temperature so high that radiation pressure becomes important. As you can imagine, this pressure is sometimes so high that it starts a wind blowing from the surface of the star. Winds are a common feature of massive stars. Also, at some point, the radiation pressure may make it impossible to form a ...
... temperature so high that radiation pressure becomes important. As you can imagine, this pressure is sometimes so high that it starts a wind blowing from the surface of the star. Winds are a common feature of massive stars. Also, at some point, the radiation pressure may make it impossible to form a ...
Lecture 18
... • These electrons exert pressure at the rate they transfer momentum to a unit surface area. – For one electron, this is (p/3) v/V, where v is the electron speed v=(p/me) if non-relativistic electrons – The 'number of states available' is V/h3, multiplied by 2 because two electrons can occupy each mo ...
... • These electrons exert pressure at the rate they transfer momentum to a unit surface area. – For one electron, this is (p/3) v/V, where v is the electron speed v=(p/me) if non-relativistic electrons – The 'number of states available' is V/h3, multiplied by 2 because two electrons can occupy each mo ...
Ch.4 HW
... 31. Given that the Sun is 150 million kilometers from the Earth, how long does it take light to travel from the Earth to the Sun? 32. Suppose you are operating a remote-controlled spacecraft on Mars from a station here on Earth. How long will it take the craft to respond to your command if Mars is a ...
... 31. Given that the Sun is 150 million kilometers from the Earth, how long does it take light to travel from the Earth to the Sun? 32. Suppose you are operating a remote-controlled spacecraft on Mars from a station here on Earth. How long will it take the craft to respond to your command if Mars is a ...
Astronomy In the News Parallax Class demos: Parallax
... about 0.05 arcseconds. How far away could they map the positions of stars via parallax? ...
... about 0.05 arcseconds. How far away could they map the positions of stars via parallax? ...
Nature of Stars 2
... Earth is on the other side of its orbit. As seen from the Earth, the nearby star appears to sweep through the angle shown. Half of this angle, is the parallax, p. ...
... Earth is on the other side of its orbit. As seen from the Earth, the nearby star appears to sweep through the angle shown. Half of this angle, is the parallax, p. ...
Surveying the Stars
... • How do we classify stars? • Why is a star’s mass its • We classify stars according most important to their spectral type and property? • A star’s mass at birth luminosity class. ...
... • How do we classify stars? • Why is a star’s mass its • We classify stars according most important to their spectral type and property? • A star’s mass at birth luminosity class. ...
Transcript - Chandra X
... combined mass of 1.76 solar masses. Since this exceeds Chandrasekhar’s limit that a white dwarf can support itself against gravity, it is expected that in about 700 million years they will merge and ignite a Type Ia supernova event. This observation was obtained using the Very Large Telescope (VLT) ...
... combined mass of 1.76 solar masses. Since this exceeds Chandrasekhar’s limit that a white dwarf can support itself against gravity, it is expected that in about 700 million years they will merge and ignite a Type Ia supernova event. This observation was obtained using the Very Large Telescope (VLT) ...
Chapter 10. Stellar Spectra
... mostly still in the ground state. There is not enough kinetic energy around, in general, or photons of high enough energy to excite the atoms to n - 2. Hence, although there is a lot of HI, there is not a very strong set of Balmer lines, because there are not a lot of HI atoms in the n=2 state to ab ...
... mostly still in the ground state. There is not enough kinetic energy around, in general, or photons of high enough energy to excite the atoms to n - 2. Hence, although there is a lot of HI, there is not a very strong set of Balmer lines, because there are not a lot of HI atoms in the n=2 state to ab ...
Document
... If some massive object passes between us and a background light source, it can bend and focus the light from the source, producing multiple, distorted images. ...
... If some massive object passes between us and a background light source, it can bend and focus the light from the source, producing multiple, distorted images. ...
exoplanets
... •An extrasolar planet is a planet that goes around another star •A star is something that is hot enough to fuse hydrogen •More on this later •A brown dwarf is too small to be a star, and too large to be a planet •A planet is something that is large enough, but not too large •Lower limit – irrelevant ...
... •An extrasolar planet is a planet that goes around another star •A star is something that is hot enough to fuse hydrogen •More on this later •A brown dwarf is too small to be a star, and too large to be a planet •A planet is something that is large enough, but not too large •Lower limit – irrelevant ...
The Lives of Stars
... Explosive thermonuclear processes on white dwarfs and neutron stars produce novae and bursters • Material from an ordinary star in a close binary can fall onto the surface of the companion white dwarf or neutron star to produce a surface layer in which thermonuclear reactions can explosively igni ...
... Explosive thermonuclear processes on white dwarfs and neutron stars produce novae and bursters • Material from an ordinary star in a close binary can fall onto the surface of the companion white dwarf or neutron star to produce a surface layer in which thermonuclear reactions can explosively igni ...
Equivalent Widths and Chemical abundances Equivalent
... 1) Hydrogen is the base line element for analyses in the Sun. Its abundance comes from the continuum opacity though the H-minus ion. 2) Helium is very hard to measure in the Sun (no absorption lines are present). It can be inferred from solar wind particles and from measurements in solar chromospher ...
... 1) Hydrogen is the base line element for analyses in the Sun. Its abundance comes from the continuum opacity though the H-minus ion. 2) Helium is very hard to measure in the Sun (no absorption lines are present). It can be inferred from solar wind particles and from measurements in solar chromospher ...
The Milky Way - Houston Community College System
... A. Luminosity, Radius, and Temperature B. The H-R Diagram C. Giants, Supergiants, and Dwarfs D. Interferometric Observations of Star Diameters E. Luminosity Classification ...
... A. Luminosity, Radius, and Temperature B. The H-R Diagram C. Giants, Supergiants, and Dwarfs D. Interferometric Observations of Star Diameters E. Luminosity Classification ...
Autumn - Dark Sky Discovery
... The plough is perhaps the most easily recognised group of stars in the northern sky and it is a very useful ‘skymark’. The plough is always above the horizon and allows us to find Polaris, or the Pole Star. If you imagine the plough as a saucepan, then you can follow the two stars furthest from the ...
... The plough is perhaps the most easily recognised group of stars in the northern sky and it is a very useful ‘skymark’. The plough is always above the horizon and allows us to find Polaris, or the Pole Star. If you imagine the plough as a saucepan, then you can follow the two stars furthest from the ...
reasons for seasons
... (enter your own age), then I have made _________ trips around the Sun during my life. Earth’s orbit around the Sun traces out an almost perfect _____________. Thus the distance between the Sun and Earth does not change very much over the course of a year. So the reason that temperatures are ________ ...
... (enter your own age), then I have made _________ trips around the Sun during my life. Earth’s orbit around the Sun traces out an almost perfect _____________. Thus the distance between the Sun and Earth does not change very much over the course of a year. So the reason that temperatures are ________ ...
Blackbody Radiation
... of light can also be specified by their wavelengths: red has a wavelength of approximately 650 nanometers (1 nm = 1 billionth of a meter); yellow, 500 nm; violet, 350 nm. ...
... of light can also be specified by their wavelengths: red has a wavelength of approximately 650 nanometers (1 nm = 1 billionth of a meter); yellow, 500 nm; violet, 350 nm. ...
TAP 704- 8: The ladder of astronomical distances
... Beyond the distance where individual stars could be seen in galaxies, the only hope was to make further dangerous assumptions, for example that galaxies of the same type are equally bright, or equal in size. Neither method is helped by the fact that galaxies are seen at all angles to the line of sig ...
... Beyond the distance where individual stars could be seen in galaxies, the only hope was to make further dangerous assumptions, for example that galaxies of the same type are equally bright, or equal in size. Neither method is helped by the fact that galaxies are seen at all angles to the line of sig ...
Star Stuff
... Properties of stars on the Main-Sequence • fusing H He in their cores • the length of time fusion can last depends on how much “fuel” is there for fusion and the rate at which fusion occurs • amount of fuel = star’s MASS • rate of fusion = star’s LUMINOSITY ...
... Properties of stars on the Main-Sequence • fusing H He in their cores • the length of time fusion can last depends on how much “fuel” is there for fusion and the rate at which fusion occurs • amount of fuel = star’s MASS • rate of fusion = star’s LUMINOSITY ...
Tutorial: Motion
... If you get stuck or are not sure of your answer ask another group If you get really stuck or don’t understand what the Lecture Tutorial is asking as one of us for help ...
... If you get stuck or are not sure of your answer ask another group If you get really stuck or don’t understand what the Lecture Tutorial is asking as one of us for help ...
Clicker Frequency Setting Lecture 2 Outline
... • stars, sun, planets appear to move WESTWARD (rise E, set W) • constellations normally “fixed” in the sky • Earth’s motion causes constellations to “rise”, “set” ...
... • stars, sun, planets appear to move WESTWARD (rise E, set W) • constellations normally “fixed” in the sky • Earth’s motion causes constellations to “rise”, “set” ...
Death of High Mass Stars
... galaxy (billions of stars) for a few days • Some of the energy creates elements heavier than iron. These elements are distributed to the rest of the galaxy. ...
... galaxy (billions of stars) for a few days • Some of the energy creates elements heavier than iron. These elements are distributed to the rest of the galaxy. ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.