Catching Andromeda`s Light
... Andromeda’s spiral arms, he thought they might also trace the Milky Way’s spiral arms. So in 1951, Morgan mapped the locations of all the red clouds of gas he and his colleagues could find. He discovered that the gas clouds lined up along spiral arms, indicating that we live in a spiral galaxy. Why ...
... Andromeda’s spiral arms, he thought they might also trace the Milky Way’s spiral arms. So in 1951, Morgan mapped the locations of all the red clouds of gas he and his colleagues could find. He discovered that the gas clouds lined up along spiral arms, indicating that we live in a spiral galaxy. Why ...
Lec09_ch11_lifecycleofstars
... • An H-R census of the Globular cluster stars reveals the age of the cluster – since the globular cluster stars are gravitationally bound close together, they are the same distance from us • use apparent magnitude ...
... • An H-R census of the Globular cluster stars reveals the age of the cluster – since the globular cluster stars are gravitationally bound close together, they are the same distance from us • use apparent magnitude ...
How we found about BLACK HOLES
... White dwarfs are now thought to be quite common. Astronomers think that one star out of every 40 is a white dwarf: White dwarfs are so small and dim, however, that we can only see those few that are nearest to us. Although Sirius B is so small, it still has a mass equal to that of our Sun, or it wou ...
... White dwarfs are now thought to be quite common. Astronomers think that one star out of every 40 is a white dwarf: White dwarfs are so small and dim, however, that we can only see those few that are nearest to us. Although Sirius B is so small, it still has a mass equal to that of our Sun, or it wou ...
Image Analysis of Planetary Nebula NGC 6543 South Carolina State University
... tipped at various angles creating a display with two-sided symmetry. Beside the discovery of a glowing bubble of hot gas, scientists noticed an unexpected X-ray bright central star, which is an O-type star, within the structure of the planetary nebula. NGC 6543 is 8th magnitude and located almost ex ...
... tipped at various angles creating a display with two-sided symmetry. Beside the discovery of a glowing bubble of hot gas, scientists noticed an unexpected X-ray bright central star, which is an O-type star, within the structure of the planetary nebula. NGC 6543 is 8th magnitude and located almost ex ...
Logarithms and Earthquake Magnitude
... If the amplitude at 100 km is less than 4.8 x 10-7 then (A / Azero) will be less than one, which yields a magnitude less than zero because the log10 of a number less than one will be negative. In practice earthquakes this small, although quite numerous, are usually too small to be recorded and locat ...
... If the amplitude at 100 km is less than 4.8 x 10-7 then (A / Azero) will be less than one, which yields a magnitude less than zero because the log10 of a number less than one will be negative. In practice earthquakes this small, although quite numerous, are usually too small to be recorded and locat ...
ncam-program-2016 - Cline Observatory
... built for this very purpose. I report on the constraints on the planetary compositions, and address the transition from terrestrial planets, composed of rock and iron, to Neptune-like worlds, which have accreted an envelope of primordial H/He gas. I will explain the essential role of the NASA Transi ...
... built for this very purpose. I report on the constraints on the planetary compositions, and address the transition from terrestrial planets, composed of rock and iron, to Neptune-like worlds, which have accreted an envelope of primordial H/He gas. I will explain the essential role of the NASA Transi ...
ASTR 511 (O’Connell) FALL 2003 DUE FRIDAY SEPTEMBER 19
... C-1 Using the 6-in, set on the open cluster NGC 6913 (M29) in Cygnus (data sheet and finding chart attached; source: Hoag et al. Publ. U.S. Naval Obs, 17, 346, 1961.). The brightest star in this cluster is at V = 8.4. Using a 25-mm eyepiece, determine the magnitude of the faintest star in the cluste ...
... C-1 Using the 6-in, set on the open cluster NGC 6913 (M29) in Cygnus (data sheet and finding chart attached; source: Hoag et al. Publ. U.S. Naval Obs, 17, 346, 1961.). The brightest star in this cluster is at V = 8.4. Using a 25-mm eyepiece, determine the magnitude of the faintest star in the cluste ...
Black Holes
... have 1–3 solar masses, are so dense that they are very small. This image shows a 1-solar-mass neutron star, about 10 km in diameter, compared to Manhattan: ...
... have 1–3 solar masses, are so dense that they are very small. This image shows a 1-solar-mass neutron star, about 10 km in diameter, compared to Manhattan: ...
Additional Cosmology Images
... Telescope shows hundreds of thousands of stars crowded into the swirling core of our spiral Milky Way. In visible-light pictures, this region cannot be seen at all because dust lying between Earth and the galactic center blocks our view. In this false-color picture, old and cool stars are blue, whil ...
... Telescope shows hundreds of thousands of stars crowded into the swirling core of our spiral Milky Way. In visible-light pictures, this region cannot be seen at all because dust lying between Earth and the galactic center blocks our view. In this false-color picture, old and cool stars are blue, whil ...
chapter18StarDeath
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
Measuring Stars
... Once many stars are plotted on an H–R diagram, a pattern begins to form: These are the 80 closest stars to us 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 small. ...
... Once many stars are plotted on an H–R diagram, a pattern begins to form: These are the 80 closest stars to us 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 small. ...
Section 1
... by definition, the visible spectrum originates there. (We will generally use ‘atmosphere’ and ‘photosphere’ more or less interchangeably.) The photosphere is strongly affected by its characteristic temperature. Typically, the temperature drops by a factor ∼ 2 from the bottom to the top of the photos ...
... by definition, the visible spectrum originates there. (We will generally use ‘atmosphere’ and ‘photosphere’ more or less interchangeably.) The photosphere is strongly affected by its characteristic temperature. Typically, the temperature drops by a factor ∼ 2 from the bottom to the top of the photos ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... – A black hole is a massive object whose radius is so small that the escape velocity exceeds the speed of light ...
... – A black hole is a massive object whose radius is so small that the escape velocity exceeds the speed of light ...
Exercises
... ii. Calculate the fractional amount of mass converted into energy by hydrogen fusion. (Refer to Table 1 for the mass of a proton and of a helium nucleus.) iii. Derive an expression for the nuclear timescale in solar units, i.e. expressed in terms of R/R , M/M and L/L . iv. Use the mass-radius and ...
... ii. Calculate the fractional amount of mass converted into energy by hydrogen fusion. (Refer to Table 1 for the mass of a proton and of a helium nucleus.) iii. Derive an expression for the nuclear timescale in solar units, i.e. expressed in terms of R/R , M/M and L/L . iv. Use the mass-radius and ...
Core-collapse supernovae and their massive progenitors
... generated by the oscillating core is enough to drive the explosion. This mechanism was not identified previously as models were stopped at 200–300 ms and the oscillations in the core were either removed or not followed fully in 2‑D, which hence suppressed the acoustic vibrations. Burrows (this meeti ...
... generated by the oscillating core is enough to drive the explosion. This mechanism was not identified previously as models were stopped at 200–300 ms and the oscillations in the core were either removed or not followed fully in 2‑D, which hence suppressed the acoustic vibrations. Burrows (this meeti ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.