BAS - Monthly Sky Guide
... The constellation Scorpius, “The Scorpion”, sits near the central bulge region of our Milky Way Galaxy. This means it is a good place to find globular clusters attracted to the gravitational mass of the centre of our galaxy. In this one constellation there are about ten globular clusters that can b ...
... The constellation Scorpius, “The Scorpion”, sits near the central bulge region of our Milky Way Galaxy. This means it is a good place to find globular clusters attracted to the gravitational mass of the centre of our galaxy. In this one constellation there are about ten globular clusters that can b ...
Integrative Studies 410 Our Place in the Universe
... • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
... • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
The Extragalactic Distance Database: Color–Magnitude Diagrams
... boxes represent the footprint of another ACS observation of the galaxy. Footprints of observations other than those used for the production of the galaxy’s CMD often appear in these images, but those that are used are always highlighted in yellow. In order to reduce the clutter caused by the necessi ...
... boxes represent the footprint of another ACS observation of the galaxy. Footprints of observations other than those used for the production of the galaxy’s CMD often appear in these images, but those that are used are always highlighted in yellow. In order to reduce the clutter caused by the necessi ...
Stars: flux, luminosity, color, and temperature
... • Luminosity - A star produces light – the total amount of energy that a star puts out as light each second is called its Luminosity. • Flux - If we have a light detector (eye, camera, telescope) we can measure the light produced by the star – the total amount of energy intercepted by the detector d ...
... • Luminosity - A star produces light – the total amount of energy that a star puts out as light each second is called its Luminosity. • Flux - If we have a light detector (eye, camera, telescope) we can measure the light produced by the star – the total amount of energy intercepted by the detector d ...
The colour-magnitude diagram
... Surface température is not a well defined concept → one introduces effective temperature Teff Teff = temperature of a black body emitting the same flux as the star ...
... Surface température is not a well defined concept → one introduces effective temperature Teff Teff = temperature of a black body emitting the same flux as the star ...
Surveying the Stars
... other lines. Called them “F stars” • Yellow stars, with prominent double line in the yellow part of spectrum. Called them “G stars”. • Orange stars, with very weak H lines and tons of other lines. Skip some more letters and call them “K stars”. • Red stars, with no H lines, tons of lines, even big t ...
... other lines. Called them “F stars” • Yellow stars, with prominent double line in the yellow part of spectrum. Called them “G stars”. • Orange stars, with very weak H lines and tons of other lines. Skip some more letters and call them “K stars”. • Red stars, with no H lines, tons of lines, even big t ...
Calculating Main Sequence Lifetimes
... In Fig. 1, there no stars with a mass greater than 7-8 solar masses. The stars with these masses are able to begin new fusion reactions involving the burning of Helium, Carbon, Oxygen, Magnesium and Neon. A star with a mass greater than 10 solar masses can develop thermonuclear reactions until it c ...
... In Fig. 1, there no stars with a mass greater than 7-8 solar masses. The stars with these masses are able to begin new fusion reactions involving the burning of Helium, Carbon, Oxygen, Magnesium and Neon. A star with a mass greater than 10 solar masses can develop thermonuclear reactions until it c ...
A Sense of Where We Are
... 4. In the view of your instructor, the outer edge of the solar system is coincident with the outer edge of the Oort comet cloud – about 100,000 AU from the Sun. Oort cloud comets are the most distant objects orbiting the Sun, so they must belong to the solar system. 5. a) Much closer to the Sun than ...
... 4. In the view of your instructor, the outer edge of the solar system is coincident with the outer edge of the Oort comet cloud – about 100,000 AU from the Sun. Oort cloud comets are the most distant objects orbiting the Sun, so they must belong to the solar system. 5. a) Much closer to the Sun than ...
Our Universe
... • Where is the center of the Universe? – There no center of the universe because there is no edge of the universe – In a finite universe, space is curved so that if you could travel billions of light years in a straight line you would finish back where you started. – It is also possible that our uni ...
... • Where is the center of the Universe? – There no center of the universe because there is no edge of the universe – In a finite universe, space is curved so that if you could travel billions of light years in a straight line you would finish back where you started. – It is also possible that our uni ...
PowerPoint Presentation - Super Massive Black Holes
... NASA's Chandra X-ray Observatory is a telescope specially designed to detect Xray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes. ...
... NASA's Chandra X-ray Observatory is a telescope specially designed to detect Xray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes. ...
The Milky Way Galaxy
... predicted by this relationship at fainter flux levels (or larger magnitudes) m ...
... predicted by this relationship at fainter flux levels (or larger magnitudes) m ...
charts_set_9
... Halo: stars and globular clusters swarm around center of Milky Way. Very elliptical orbits with random orientations. They also cross the disk. Bulge: similar to halo. ...
... Halo: stars and globular clusters swarm around center of Milky Way. Very elliptical orbits with random orientations. They also cross the disk. Bulge: similar to halo. ...
20140319_J.Gan
... The cumulative effect of multiple high-speed impulsive encounters is generally referred to as galaxy harassment. The fragile disks of late-type (Sc-Sd) spiral galaxies can be almost entirely destroyed by harassment. The disks lose very substantial amounts of mass. The bound stars are also heat ...
... The cumulative effect of multiple high-speed impulsive encounters is generally referred to as galaxy harassment. The fragile disks of late-type (Sc-Sd) spiral galaxies can be almost entirely destroyed by harassment. The disks lose very substantial amounts of mass. The bound stars are also heat ...
Evan_Skillman_1
... Pleiades now has no stars with life expectancy less than around 100 million years. ...
... Pleiades now has no stars with life expectancy less than around 100 million years. ...
Galactic astronomy - Sierra College Astronomy Home Page
... Must be observed at radio, infrared, and x-rays. Sgr A* ...
... Must be observed at radio, infrared, and x-rays. Sgr A* ...
Astronomy 120
... Sirius (bluish). List these stars in order of increasing surface temperature. Estimate the surface temperature of Betelgeuse and of Sirius. 2. Zeilik Study Exercise 13.9 Jupiter is about 5 times as far from the sun as the earth is ( 5 A.U.’s compared to 1 A.U. ). By how much less is the sun’s flux ...
... Sirius (bluish). List these stars in order of increasing surface temperature. Estimate the surface temperature of Betelgeuse and of Sirius. 2. Zeilik Study Exercise 13.9 Jupiter is about 5 times as far from the sun as the earth is ( 5 A.U.’s compared to 1 A.U. ). By how much less is the sun’s flux ...
AST 207 Homework 4 Due 7 October 2011
... 1. In alternative solar system, is a star Nus with two planets Htrae and Sram. Htrae orbits Nus at a distance of 1AU, and it takes 3 of our years for Htrae to orbit once around Nus. Sram orbits at a distance of 1.88 AU. a. (3 pts.) What principle or law enables you to do parts (b) and (c)? b. (2 pts ...
... 1. In alternative solar system, is a star Nus with two planets Htrae and Sram. Htrae orbits Nus at a distance of 1AU, and it takes 3 of our years for Htrae to orbit once around Nus. Sram orbits at a distance of 1.88 AU. a. (3 pts.) What principle or law enables you to do parts (b) and (c)? b. (2 pts ...
Life Cycle of a Star
... galaxies. Black holes are thought to do this by heating up and blasting away the gas that fuels star formation. • The blue color here represents radiation pouring out from material very close to the black hole. The grayish structure surrounding the black hole, called a torus, is made up of gas and d ...
... galaxies. Black holes are thought to do this by heating up and blasting away the gas that fuels star formation. • The blue color here represents radiation pouring out from material very close to the black hole. The grayish structure surrounding the black hole, called a torus, is made up of gas and d ...
W > 1 - The Open University
... Delta () Cephei. +3.5 to +4.4, period 5.37 days. The prototype for the Cepheid class of variable stars. Their period-luminosity relationship has lead them to being used as “standard candles” in measuring distances to nearby galaxies. Maximum brightness occurs on 4th, 10th, 15th, 20th, 26th and 31st ...
... Delta () Cephei. +3.5 to +4.4, period 5.37 days. The prototype for the Cepheid class of variable stars. Their period-luminosity relationship has lead them to being used as “standard candles” in measuring distances to nearby galaxies. Maximum brightness occurs on 4th, 10th, 15th, 20th, 26th and 31st ...
Beyond the Solar System Homework for Geology 8
... distance between the Earth and the Sun is referred to as: 67. The distance light travels in a year, called a ________ _______, and is used by astronomers to measure stellar distances. 68. A large, red, gaseous body that is about to become a star but is not hot enough to engage in nuclear fusion is c ...
... distance between the Earth and the Sun is referred to as: 67. The distance light travels in a year, called a ________ _______, and is used by astronomers to measure stellar distances. 68. A large, red, gaseous body that is about to become a star but is not hot enough to engage in nuclear fusion is c ...
Supernovae – the biggest bangs since the Big Bang
... However, if matter passes to the white dwarf star and it becomes more than 40 percent “heavier” than the Sun, it will make a huge explosion. The entire white dwarf will explode with the energy of four billion Suns. This is called a “white dwarf supernova” (also known as a “Type Ia supernova”). Im ...
... However, if matter passes to the white dwarf star and it becomes more than 40 percent “heavier” than the Sun, it will make a huge explosion. The entire white dwarf will explode with the energy of four billion Suns. This is called a “white dwarf supernova” (also known as a “Type Ia supernova”). Im ...
Slide 1
... supernova is an exploding star that can become three times as bright as the sun. When a supernova occurs. All the dust particles, gas, and Dupree collect up. Creating a Nebula. These Nebulas can create many stars like our sun. Some stars can be brighter then others. This is an example of a Supernova ...
... supernova is an exploding star that can become three times as bright as the sun. When a supernova occurs. All the dust particles, gas, and Dupree collect up. Creating a Nebula. These Nebulas can create many stars like our sun. Some stars can be brighter then others. This is an example of a Supernova ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.