1 Kepler`s Third Law
... results of the equation match-up with our systems of measurement. The ‘−’ sign indicates that the force is attractive. Example: Q: Halley’s Comet travels on an eccentric elliptical orbit which carries it as close as about 1AU to the Sun and as far as about 20AU. Compare the gravitational force betwe ...
... results of the equation match-up with our systems of measurement. The ‘−’ sign indicates that the force is attractive. Example: Q: Halley’s Comet travels on an eccentric elliptical orbit which carries it as close as about 1AU to the Sun and as far as about 20AU. Compare the gravitational force betwe ...
ASTR 101 Final Study Guide Use as a guide to the topics as you
... o Black holes in binary systems draw in gasses from the companion star, which forms an accretion disk that rapidly orbits around the black hole. These gasses can orbit at nearly the speed of light and reach temperatures of up to 10 million K. This causes the gas to emit gamma and x-rays. o We can pi ...
... o Black holes in binary systems draw in gasses from the companion star, which forms an accretion disk that rapidly orbits around the black hole. These gasses can orbit at nearly the speed of light and reach temperatures of up to 10 million K. This causes the gas to emit gamma and x-rays. o We can pi ...
The Sun and other Stars
... When stars like the Sun begin to fuse H to He they fall into the Main sequence stars. The Sun will remain a main sequence star until uses about 90% of its fuel in the core. This is the beginning of the End ...
... When stars like the Sun begin to fuse H to He they fall into the Main sequence stars. The Sun will remain a main sequence star until uses about 90% of its fuel in the core. This is the beginning of the End ...
Stars, Stellar classification, H
... It would be only 1/3 as bright It would be only 1/6 as bright It would be only 1/9 as bright It would be three times brighter ...
... It would be only 1/3 as bright It would be only 1/6 as bright It would be only 1/9 as bright It would be three times brighter ...
K - College of San Mateo
... SBIG SGS spectrograph with 600 lines per mm, with hi res. grating. Dispersion=1.06A/pixel. Stars are imaged in blue and/or red end of the spectrum. A mercury lamp provides blue calibration spectra, and a neon lamp, the red calibration spectra. We’ve added a cable to the SGS, to allow computer room c ...
... SBIG SGS spectrograph with 600 lines per mm, with hi res. grating. Dispersion=1.06A/pixel. Stars are imaged in blue and/or red end of the spectrum. A mercury lamp provides blue calibration spectra, and a neon lamp, the red calibration spectra. We’ve added a cable to the SGS, to allow computer room c ...
April 2013
... Although the former process is energetically unfavourable, the second affords the correct amount of energy (the Hoyle resonance) to produce an excited state of carbon, so allowing that fusion. Some carbon then fuses with a further α-particle, forming oxygen: ...
... Although the former process is energetically unfavourable, the second affords the correct amount of energy (the Hoyle resonance) to produce an excited state of carbon, so allowing that fusion. Some carbon then fuses with a further α-particle, forming oxygen: ...
Model of Stars—6 Oct Test 1: Average 17 (75%) •
... People emit light in the “thermal infrared” part of the spectrum. Your eyes cannot see infrared radiation. 8000< <12000nm You can see visible light • Blue 440nm • Green 550nm • Red 620nm ...
... People emit light in the “thermal infrared” part of the spectrum. Your eyes cannot see infrared radiation. 8000< <12000nm You can see visible light • Blue 440nm • Green 550nm • Red 620nm ...
temperature - University of Texas Astronomy Home Page
... this is called the “Rayleigh-Jeans tail” (i.e. cooler temperatures, lower energies than the peak) ...
... this is called the “Rayleigh-Jeans tail” (i.e. cooler temperatures, lower energies than the peak) ...
High School Science Proficiency Review #2 Earth Science
... 13. The graph below shows the relationship between the and early 1970s. distance and velocity of several galaxies. D. the Moon in the late 1960s and early 1970s, but have not returned. ...
... 13. The graph below shows the relationship between the and early 1970s. distance and velocity of several galaxies. D. the Moon in the late 1960s and early 1970s, but have not returned. ...
GEARS Workshop Monday - Georgia Southern University
... our own Sun, have found a remarkable object where the nuclear reactor that once powered it has only just shut down. This star, the hottest known white dwarf, H1504+65, seems to have been stripped of its entire outer regions during its death throes leaving behind the core that formed its power plant. ...
... our own Sun, have found a remarkable object where the nuclear reactor that once powered it has only just shut down. This star, the hottest known white dwarf, H1504+65, seems to have been stripped of its entire outer regions during its death throes leaving behind the core that formed its power plant. ...
Light, spectra, Doppler shifts
... Say there is a source of black body radiation out there in space. It gives off light of all wavelengths, but puts out a lot of its light around some wavelength corresponding to its temperature. Now say there is some cooler hydrogen gas along the line of sight. What happens? Some of that continuous ...
... Say there is a source of black body radiation out there in space. It gives off light of all wavelengths, but puts out a lot of its light around some wavelength corresponding to its temperature. Now say there is some cooler hydrogen gas along the line of sight. What happens? Some of that continuous ...
Light, spectra, Doppler shifts
... If a star like the Sun has iron, calcium, sodium, and other metallic lines in its spectrum, but it has relatively weak hydrogen lines, then its atmosphere must be composed of Fe, Ca, Na, but little H, right? That's what astronomers thought until the 1920's. They then realized that the fraction of a ...
... If a star like the Sun has iron, calcium, sodium, and other metallic lines in its spectrum, but it has relatively weak hydrogen lines, then its atmosphere must be composed of Fe, Ca, Na, but little H, right? That's what astronomers thought until the 1920's. They then realized that the fraction of a ...
The Dramatic Lives of Stars
... Young stars are called “Pre-main sequence” stars. They sit to the upper right of the main sequence in an HR diagram. ...
... Young stars are called “Pre-main sequence” stars. They sit to the upper right of the main sequence in an HR diagram. ...
"Stars" pdf file
... In fact all stars are spheroid or semispheric because of gravity forces. All matter found in the universe generates a force of attraction simply because of its mass. If the distribution of matter is uniform, such as for example in a cloud of gas, around the gravity center the mass tends to accumulat ...
... In fact all stars are spheroid or semispheric because of gravity forces. All matter found in the universe generates a force of attraction simply because of its mass. If the distribution of matter is uniform, such as for example in a cloud of gas, around the gravity center the mass tends to accumulat ...
Type II supernova
A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star. A star must have at least 8 times, and no more than 40–50 times, the mass of the Sun (M☉) for this type of explosion. It is distinguished from other types of supernovae by the presence of hydrogen in its spectrum. Type II supernovae are mainly observed in the spiral arms of galaxies and in H II regions, but not in elliptical galaxies.Stars generate energy by the nuclear fusion of elements. Unlike the Sun, massive stars possess the mass needed to fuse elements that have an atomic mass greater than hydrogen and helium, albeit at increasingly higher temperatures and pressures, causing increasingly shorter stellar life spans. The degeneracy pressure of electrons and the energy generated by these fusion reactions are sufficient to counter the force of gravity and prevent the star from collapsing, maintaining stellar equilibrium. The star fuses increasingly higher mass elements, starting with hydrogen and then helium, progressing up through the periodic table until a core of iron and nickel is produced. Fusion of iron or nickel produces no net energy output, so no further fusion can take place, leaving the nickel-iron core inert. Due to the lack of energy output allowing outward pressure, equilibrium is broken.When the mass of the inert core exceeds the Chandrasekhar limit of about 1.4 M☉, electron degeneracy alone is no longer sufficient to counter gravity and maintain stellar equilibrium. A cataclysmic implosion takes place within seconds, in which the outer core reaches an inward velocity of up to 23% of the speed of light and the inner core reaches temperatures of up to 100 billion kelvin. Neutrons and neutrinos are formed via reversed beta-decay, releasing about 1046 joules (100 foes) in a ten-second burst. The collapse is halted by neutron degeneracy, causing the implosion to rebound and bounce outward. The energy of this expanding shock wave is sufficient to accelerate the surrounding stellar material to escape velocity, forming a supernova explosion, while the shock wave and extremely high temperature and pressure briefly allow for theproduction of elements heavier than iron. Depending on initial size of the star, the remnants of the core form a neutron star or a black hole. Because of the underlying mechanism, the resulting nova is also described as a core-collapse supernova.There exist several categories of Type II supernova explosions, which are categorized based on the resulting light curve—a graph of luminosity versus time—following the explosion. Type II-L supernovae show a steady (linear) decline of the light curve following the explosion, whereas Type II-P display a period of slower decline (a plateau) in their light curve followed by a normal decay. Type Ib and Ic supernovae are a type of core-collapse supernova for a massive star that has shed its outer envelope of hydrogen and (for Type Ic) helium. As a result, they appear to be lacking in these elements.