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Chapter 10: The Stars
... • If the distance to Star A is 10 times greater than the distance to star B, and the 2 stars have the same luminosity, how would their apparent brightness ...
... • If the distance to Star A is 10 times greater than the distance to star B, and the 2 stars have the same luminosity, how would their apparent brightness ...
April - Bristol Astronomical Society
... To the northeast of Archimedes you will find Aristillus, Lat 33.9° N, Lon 1.2° E. Aristillus has a diameter of 55km (33 miles). The floor of the crater is flat with a triple central peak rising to over 900m. Aristillus has very steep sides with high terraced walls. Completing a trio of craters is Au ...
... To the northeast of Archimedes you will find Aristillus, Lat 33.9° N, Lon 1.2° E. Aristillus has a diameter of 55km (33 miles). The floor of the crater is flat with a triple central peak rising to over 900m. Aristillus has very steep sides with high terraced walls. Completing a trio of craters is Au ...
Chapter 24
... Properties of stars Distance • Measuring a star's distance can be very difficult • Stellar parallax • Used for measuring distance to a star • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is l ...
... Properties of stars Distance • Measuring a star's distance can be very difficult • Stellar parallax • Used for measuring distance to a star • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is l ...
Luminosity
... These two stars have about the same luminosity— which one appears brighter? A. Alpha Centauri B. The Sun ...
... These two stars have about the same luminosity— which one appears brighter? A. Alpha Centauri B. The Sun ...
AyC10 Fall 2007: Midterm 2 Review Sheet
... Describe how parallax works. What does this effect depend on? Can we use it to determine the distance to all stars? Parallax is an effect we observe when we take precise measurements of the positions of stars. We use it to determine the distance to stars. Because the Earth’s location changes as it o ...
... Describe how parallax works. What does this effect depend on? Can we use it to determine the distance to all stars? Parallax is an effect we observe when we take precise measurements of the positions of stars. We use it to determine the distance to stars. Because the Earth’s location changes as it o ...
AJAstroProject
... million ly away. • It is in the same group as M95 (Previous) and M96 not photographed. • In this exposure you can see two other galaxies, NGC3384 and NGC3379. • NGC3384 is in the Leo Group I and NGC3379 is a more distant galaxy. This was a 90sec exposure through the V-filter. ...
... million ly away. • It is in the same group as M95 (Previous) and M96 not photographed. • In this exposure you can see two other galaxies, NGC3384 and NGC3379. • NGC3384 is in the Leo Group I and NGC3379 is a more distant galaxy. This was a 90sec exposure through the V-filter. ...
Constellations and the Galactic Plane
... are all familiar names to northern hemisphere night sky watchers. There are 88 named constellations, each having numerous stars. This exercise takes you through some of the most recognizable ones in the October-November sky in the Bay Area. The patterns of stars remain the same over the ages. That i ...
... are all familiar names to northern hemisphere night sky watchers. There are 88 named constellations, each having numerous stars. This exercise takes you through some of the most recognizable ones in the October-November sky in the Bay Area. The patterns of stars remain the same over the ages. That i ...
Astronomy Assignment #1
... Star D will appear brighter by a factor of 10,000 over star C. 13. How do the magnitudes of stars C and D in problem 4 compare? (Problem 4 synopsis: Stars C and D are the same distance from us, but star D is 10,000 times more luminous.) To answer this problem you need to use the rule regarding magni ...
... Star D will appear brighter by a factor of 10,000 over star C. 13. How do the magnitudes of stars C and D in problem 4 compare? (Problem 4 synopsis: Stars C and D are the same distance from us, but star D is 10,000 times more luminous.) To answer this problem you need to use the rule regarding magni ...
Stars and Constellations
... comparison? Brightness is determined by both distance and luminosity. A star which radiates a lot of light, but is far away from the Earth, can appear less bright than a less luminous star closer to Earth. Imagine sitting outside at night with a candle. The light from the candle will seem much brigh ...
... comparison? Brightness is determined by both distance and luminosity. A star which radiates a lot of light, but is far away from the Earth, can appear less bright than a less luminous star closer to Earth. Imagine sitting outside at night with a candle. The light from the candle will seem much brigh ...
Luminosity and brightness
... (b) the distance of the star from the observer on the Earth If we have two stars of the same luminosity with one star double the distance of the other from the Earth the closer star will look four times brighter. It obeys the inverse square law. The photograph shows the Pleiades star cluster. The br ...
... (b) the distance of the star from the observer on the Earth If we have two stars of the same luminosity with one star double the distance of the other from the Earth the closer star will look four times brighter. It obeys the inverse square law. The photograph shows the Pleiades star cluster. The br ...
Astronomy 102, Spring 2003 Solutions to Review Problems
... 2 , where F is the flux you measure— but you then also need d, the distance, in order to calculate L. For mass, if it’s a binary star, you can measure the period of the orbit without knowing the distance, but again to get the physical semi-major axis of the orbit from the angular separation of the t ...
... 2 , where F is the flux you measure— but you then also need d, the distance, in order to calculate L. For mass, if it’s a binary star, you can measure the period of the orbit without knowing the distance, but again to get the physical semi-major axis of the orbit from the angular separation of the t ...
pptx
... Much larger than open clusters like the Pleiades All have no upper main sequence stars All have spectra showing low or very low heavy element content The oldest clusters in our Galaxy (and some of the oldest objects) ...
... Much larger than open clusters like the Pleiades All have no upper main sequence stars All have spectra showing low or very low heavy element content The oldest clusters in our Galaxy (and some of the oldest objects) ...
Lecture 11, PPT version
... the “zero velocity” line pattern. The curved magenta line above shows you how one particular black absorption line sweeps up and down the spectrum due to orbital motion. ...
... the “zero velocity” line pattern. The curved magenta line above shows you how one particular black absorption line sweeps up and down the spectrum due to orbital motion. ...
Lecture Ten - The Sun Amongst the Stars Part II
... dimness is why they do not appear clearly on many HR diagrams. ...
... dimness is why they do not appear clearly on many HR diagrams. ...
Luminosity
... – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
... – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
relax it`s only parallax!
... With current technology, parallax can only be used to measure distances out to about 500 parsecs, which is about 1.5 × 1016 kilometers. This might seem like a great distance, but it is only about 7% of the way to the center of our Milky Way galaxy. ...
... With current technology, parallax can only be used to measure distances out to about 500 parsecs, which is about 1.5 × 1016 kilometers. This might seem like a great distance, but it is only about 7% of the way to the center of our Milky Way galaxy. ...
Summer Triangle (Winter in the south hemisphere) Lyra
... Deneb is a blue-white giant star at the tip of the Northern Cross. It is 1400 light-years away, and is the 19th brightest star in the sky - more than 54,00 times the Sun's luminosity - making it one of the most luminous stars in the Milky Way. Due to precession, Deneb was a pole star 18,000 years ag ...
... Deneb is a blue-white giant star at the tip of the Northern Cross. It is 1400 light-years away, and is the 19th brightest star in the sky - more than 54,00 times the Sun's luminosity - making it one of the most luminous stars in the Milky Way. Due to precession, Deneb was a pole star 18,000 years ag ...
Luminosity - U of L Class Index
... • What are the two types of star clusters? Open clusters are loosely packed and contain up to a few thousand stars Globular clusters are densely packed and contain hundreds of thousands of stars ...
... • What are the two types of star clusters? Open clusters are loosely packed and contain up to a few thousand stars Globular clusters are densely packed and contain hundreds of thousands of stars ...
ASTR 1050: Survey of Astronomy
... 25. A main sequence type A star has about twice the surface temperature of our sun (a type G star). Assuming the stars are about the same physical size (i.e., same radius), how much more luminous is the type A star? a. Twice as luminous. b. Four times as luminous. c. Eight times as luminous. d. Sixt ...
... 25. A main sequence type A star has about twice the surface temperature of our sun (a type G star). Assuming the stars are about the same physical size (i.e., same radius), how much more luminous is the type A star? a. Twice as luminous. b. Four times as luminous. c. Eight times as luminous. d. Sixt ...
Measuring the Properties of Stars (ch. 17)
... Knowing the apparent brightness (really easy to measure) and luminosity, this gives the distance (review earlier material if you don’t understand this), without having to get a trigonometric parallax. Distances obtained in this way are called “spectroscopic parallaxes.” (In “spectroscopic parallax” ...
... Knowing the apparent brightness (really easy to measure) and luminosity, this gives the distance (review earlier material if you don’t understand this), without having to get a trigonometric parallax. Distances obtained in this way are called “spectroscopic parallaxes.” (In “spectroscopic parallax” ...
An Introduction To Parallax
... to obtain a direct measurement of the distance to an object. A driver and her passenger, for example, may fall prey to this effect when arguing about a car’s speed. If the car uses a needle–type speedometer, where the needle is mounted slightly in front of its dial scale, the two are likely not to m ...
... to obtain a direct measurement of the distance to an object. A driver and her passenger, for example, may fall prey to this effect when arguing about a car’s speed. If the car uses a needle–type speedometer, where the needle is mounted slightly in front of its dial scale, the two are likely not to m ...
Astronomy
... 1. ______ The constellation Ursa Major is visible to observers near Pittsburgh year-round. 2. ______ The celestial equator always crosses the horizon at the north point and south point. 3. ______ The celestial equator always passes directly overhead to those that live on the equator. 4. ______ A fir ...
... 1. ______ The constellation Ursa Major is visible to observers near Pittsburgh year-round. 2. ______ The celestial equator always crosses the horizon at the north point and south point. 3. ______ The celestial equator always passes directly overhead to those that live on the equator. 4. ______ A fir ...
Multiple Choice, continued
... • Galaxies are the major building blocks of the universe. Astronomers estimate that the universe contains hundreds of billions of galaxies. • A typical galaxy, such as the Milky Way, has a diameter of about 100,000 light-years and may contain more than 200 billion stars. ...
... • Galaxies are the major building blocks of the universe. Astronomers estimate that the universe contains hundreds of billions of galaxies. • A typical galaxy, such as the Milky Way, has a diameter of about 100,000 light-years and may contain more than 200 billion stars. ...
Malmquist bias
The Malmquist bias is an effect in observational astronomy which leads to the preferential detection of intrinsically bright objects. It was first described in 1922 by Swedish astronomer Gunnar Malmquist (1893–1982), who then greatly elaborated upon this work in 1925. In statistics, this bias is referred to as a selection bias and affects the survey results in a brightness limited survey, where stars below a certain apparent brightness are not included. Since observed stars and galaxies appear dimmer when farther away, the brightness that is measured will fall off with distance until their brightness falls below the observational threshold. Objects which are more luminous, or intrinsically brighter, can be observed at a greater distance, creating a false trend of increasing intrinsic brightness, and other related quantities, with distance. This effect has led to many spurious claims in the field of astronomy. Properly correcting for these effects has become an area of great focus.