pptx
... colour (blackbody) spectrum depends only on its temperature hotter = bluer and brighter ...
... colour (blackbody) spectrum depends only on its temperature hotter = bluer and brighter ...
Galaxies and the Universe
... • This is about 31 trillion km. Or 3.26 ly. • Proxima Centauri has a parallax of 0.77 arcseconds. So it is 1/0.77= 1.3 parsecs away. • Sense of scale: – If you make a model where the distance between the Earth and the Sun (1 AU) is an inch, then one light-year is a mile. One parsec is 3.26 miles. – ...
... • This is about 31 trillion km. Or 3.26 ly. • Proxima Centauri has a parallax of 0.77 arcseconds. So it is 1/0.77= 1.3 parsecs away. • Sense of scale: – If you make a model where the distance between the Earth and the Sun (1 AU) is an inch, then one light-year is a mile. One parsec is 3.26 miles. – ...
The Rotational Period of the Sun (Higher Level)
... the abundance of elements in the star, its motion (velocity). How can we tell if the Sun is rotating? Answer: we look at its spectrum from different regions. If the lines are shifted towards the red end (longer wavelengths) relative to a spectrum at rest than that part of the Sun is moving away from ...
... the abundance of elements in the star, its motion (velocity). How can we tell if the Sun is rotating? Answer: we look at its spectrum from different regions. If the lines are shifted towards the red end (longer wavelengths) relative to a spectrum at rest than that part of the Sun is moving away from ...
Star Maps and Constellations
... Herschel’s measurements suggested a 1st magnitude star is 100x more luminous that a 6th magnitude one. Norman Pogson (1854) showed that this is because the eye’s response to light is logarithmic rather than linear. ...
... Herschel’s measurements suggested a 1st magnitude star is 100x more luminous that a 6th magnitude one. Norman Pogson (1854) showed that this is because the eye’s response to light is logarithmic rather than linear. ...
PH607lec12
... strongly suspected to be a supermassive black hole. Most galaxies are believed to have a supermassive black hole at their centre. Ever since black holes were suggested as the power sources for Active Galactic Nuclei (AGNs) such as Seyfert Galaxies and ...
... strongly suspected to be a supermassive black hole. Most galaxies are believed to have a supermassive black hole at their centre. Ever since black holes were suggested as the power sources for Active Galactic Nuclei (AGNs) such as Seyfert Galaxies and ...
Document
... • Mark, Dan, (Jacquelyn,) and I will be roaming around if you need help… • If your group finishes, check your answers with another group. ...
... • Mark, Dan, (Jacquelyn,) and I will be roaming around if you need help… • If your group finishes, check your answers with another group. ...
Neutron Stars and Black Holes
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
What is a standard candle?
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
Nuclear Fusion - Orlando STC chapter
... Ever since the beginning of life on Earth, the Sun has sent the energy needed to keep its inhabitants alive. Solar rays light the days, warm the soil, and provide plants with the raw energy they need to make food. We know the Earth’s energy comes from the Sun, but from where does the Sun’s energy ...
... Ever since the beginning of life on Earth, the Sun has sent the energy needed to keep its inhabitants alive. Solar rays light the days, warm the soil, and provide plants with the raw energy they need to make food. We know the Earth’s energy comes from the Sun, but from where does the Sun’s energy ...
1” “Sky-Notes” of the Open University Astronomy Club. April 2006. 1
... a large hazy patch reveals a beautiful scattering of moderate to faint stars. This is the Coma star cluster (Mel 111) best seen in binoculars and well worth a photograph. 2 Com ds (6.0, 7.5) separation 3.6". Use high power when seeing is good. 24 Com ds. (5.0,6.5) separation 20.3" Wide contrasting y ...
... a large hazy patch reveals a beautiful scattering of moderate to faint stars. This is the Coma star cluster (Mel 111) best seen in binoculars and well worth a photograph. 2 Com ds (6.0, 7.5) separation 3.6". Use high power when seeing is good. 24 Com ds. (5.0,6.5) separation 20.3" Wide contrasting y ...
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... 4. An object of great interest in astronomy can be located at the following coordinates: RA = 18h 53m 36.0s, Dec = 33° 02’ 00.0 ‘’ (Note: you may have to hunt around for it a bit) What ...
... 4. An object of great interest in astronomy can be located at the following coordinates: RA = 18h 53m 36.0s, Dec = 33° 02’ 00.0 ‘’ (Note: you may have to hunt around for it a bit) What ...
Answer to question 1 - Northwestern University
... • What limits the accuracy of my measurement? • How will I calibrate my measurements so that somebody else can judge the results. • What assumptions will I have to make from theory or experiment to build my case. • If I’m looking for an effect (such as WIMPs), will my result be interesting even if I ...
... • What limits the accuracy of my measurement? • How will I calibrate my measurements so that somebody else can judge the results. • What assumptions will I have to make from theory or experiment to build my case. • If I’m looking for an effect (such as WIMPs), will my result be interesting even if I ...
UNIVERSITY OF BRISTOL
... The bulge and disc components of a certain galaxy are observed to have half light (effective) radii of 3 arcsec and 15 arcsec, and surface brightnesses at these radii of 22 and 23 B magnitudes per square arcsec, respectively. Calculate the bulge-to-disc ratio. [You may assume that in the usual notat ...
... The bulge and disc components of a certain galaxy are observed to have half light (effective) radii of 3 arcsec and 15 arcsec, and surface brightnesses at these radii of 22 and 23 B magnitudes per square arcsec, respectively. Calculate the bulge-to-disc ratio. [You may assume that in the usual notat ...
The Sun
... • The standard model of the Sun suggests that hydrogen fusion takes place in a core extending from the Sun’s center to about 0.25 solar radius. • The core is surrounded by a radiative zone extending to about 0.71 solar radius. In this zone, energy travels outward through radiative diffusion. • The r ...
... • The standard model of the Sun suggests that hydrogen fusion takes place in a core extending from the Sun’s center to about 0.25 solar radius. • The core is surrounded by a radiative zone extending to about 0.71 solar radius. In this zone, energy travels outward through radiative diffusion. • The r ...
PowerPoint
... Analysis of iron spectral lines can use the gravitational red-shift to measure the gravitational strength and how compact the object is. This has shown that there is matter orbiting as close as 160 km - only six times bigger than the Schwarzschild radius. ...
... Analysis of iron spectral lines can use the gravitational red-shift to measure the gravitational strength and how compact the object is. This has shown that there is matter orbiting as close as 160 km - only six times bigger than the Schwarzschild radius. ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.