dtu7ech11 - Fort Thomas Independent Schools
... are cooler but larger than hotter, dimmer stars, such as white dwarfs. What sizes are stars? Stars range from more than 1000 times the Sun’s diameter to less than 1/100 the Sun’s diameter. Are most stars isolated from other stars, as the Sun is? No. In the vicinity of the Sun, two-thirds of the star ...
... are cooler but larger than hotter, dimmer stars, such as white dwarfs. What sizes are stars? Stars range from more than 1000 times the Sun’s diameter to less than 1/100 the Sun’s diameter. Are most stars isolated from other stars, as the Sun is? No. In the vicinity of the Sun, two-thirds of the star ...
Sample final exam
... stars tend to be in classes O, B and A (not all of them are, fortunately). Population II stars tend to be old red giants. First, given these two populations, what differences in color would a galaxy have? Recall that the text (page 160) states that there is “some evidence” that spiral galaxies evolv ...
... stars tend to be in classes O, B and A (not all of them are, fortunately). Population II stars tend to be old red giants. First, given these two populations, what differences in color would a galaxy have? Recall that the text (page 160) states that there is “some evidence” that spiral galaxies evolv ...
Objectives
... • Less massive stars burn cooler and therefore can last longer • Our Sun will fuse hydrogen for about 10 billion years • Once a star’s Hydrogen supply runs out, fusion stops and the core begins to contract • At this time, the outer layers of hydrogen fuse at an incredible rate and the star expands t ...
... • Less massive stars burn cooler and therefore can last longer • Our Sun will fuse hydrogen for about 10 billion years • Once a star’s Hydrogen supply runs out, fusion stops and the core begins to contract • At this time, the outer layers of hydrogen fuse at an incredible rate and the star expands t ...
Indoor lab #1: The Hertzsprung-Russel Diagram and Selection Effects
... a) the average distance of all the stars in your table: b) the number of and average distance of the red giant stars (stars of type 1) c) the number of and average distance of the bluer main sequence stars (stars of type 2) d) the number of and average distance of the redder main sequence stars (sta ...
... a) the average distance of all the stars in your table: b) the number of and average distance of the red giant stars (stars of type 1) c) the number of and average distance of the bluer main sequence stars (stars of type 2) d) the number of and average distance of the redder main sequence stars (sta ...
Star Types
... Most stars appear on the Main Sequence, where stars appear to obey a Mass-Luminosity relation: L M3.5 For example, if the mass of a star is doubled, its luminosity increases by a factor 23.5 ~ 11. Thus, stars like Sirius that are about twice as massive as the Sun are about 11 times as luminous. Th ...
... Most stars appear on the Main Sequence, where stars appear to obey a Mass-Luminosity relation: L M3.5 For example, if the mass of a star is doubled, its luminosity increases by a factor 23.5 ~ 11. Thus, stars like Sirius that are about twice as massive as the Sun are about 11 times as luminous. Th ...
Proxima
... “red giant” with a surface temperature of 3330K. What is a red giant? A red giant is a star that expands and cools once it runs out of hydrogen fuel. These stars are not as red to our eyes as they are orange. Red Giant http://foxd3sign.deviantart.com/ar t/RED-GIANT-001-164580656 ...
... “red giant” with a surface temperature of 3330K. What is a red giant? A red giant is a star that expands and cools once it runs out of hydrogen fuel. These stars are not as red to our eyes as they are orange. Red Giant http://foxd3sign.deviantart.com/ar t/RED-GIANT-001-164580656 ...
Additional Images
... the stars reached its Roche volume) eclipsing binary of a cream-white color. The brightness varies from 3.4 mag to 4.3 mag every twelve days and 22 hours. One of the two stars of this system is filling its Roche surface and ellipsoidally deformed. Beta Lyrae is the prototype of this class of eclipsi ...
... the stars reached its Roche volume) eclipsing binary of a cream-white color. The brightness varies from 3.4 mag to 4.3 mag every twelve days and 22 hours. One of the two stars of this system is filling its Roche surface and ellipsoidally deformed. Beta Lyrae is the prototype of this class of eclipsi ...
Issue 122 - Aug 2014
... exoplanets. yet only two stars brighter than third magnitude. The brightest star (Kornephoros or Beta Herculis) is a G-type (yellow, 4,900K) giant star that has used up the hydrogen in its core and is dying. With a mass is ~3 times that of the Sun and a diameter ~17 times that of the Sun, it is ~15 ...
... exoplanets. yet only two stars brighter than third magnitude. The brightest star (Kornephoros or Beta Herculis) is a G-type (yellow, 4,900K) giant star that has used up the hydrogen in its core and is dying. With a mass is ~3 times that of the Sun and a diameter ~17 times that of the Sun, it is ~15 ...
Distances farther out
... Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as Uma (ie Mv = -0.3), then it would be 50 % farther away. In a cluster can use several stars or whole main sequence to increase precisio ...
... Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as Uma (ie Mv = -0.3), then it would be 50 % farther away. In a cluster can use several stars or whole main sequence to increase precisio ...
14.5 Yellow Giants and Pulsating Stars Variable Stars Not all stars
... stars. For example, ZZ Ceti stars, a kind of pulsating white dwarf with periods as short as a few minutes are found in the lower portion of the HR diagram. There are many stars like Mira (known as Mira variables) that have pulsation periods of about 1 year. These lie in the upper right of the HR d ...
... stars. For example, ZZ Ceti stars, a kind of pulsating white dwarf with periods as short as a few minutes are found in the lower portion of the HR diagram. There are many stars like Mira (known as Mira variables) that have pulsation periods of about 1 year. These lie in the upper right of the HR d ...
Interactive Vocabulary Review for Outer Space Indicator
... A natural, luminous, celestial body is better known as a STAR! ...
... A natural, luminous, celestial body is better known as a STAR! ...
Society News - Bristol Astronomical Society
... Coma Berenices, M53, M64, M85, M88, M91, M98, M99 and M100. All these objects are galaxies with the exception of M53, which is a globular cluster. In the west the winter constellations of Orion and Taurus are disappearing below the western horizon, only Gemini remains above the horizon beyond midnig ...
... Coma Berenices, M53, M64, M85, M88, M91, M98, M99 and M100. All these objects are galaxies with the exception of M53, which is a globular cluster. In the west the winter constellations of Orion and Taurus are disappearing below the western horizon, only Gemini remains above the horizon beyond midnig ...
SIERRA STAR GAZERS
... This constellation is easily found just east of the scorpion’s stinger. While Mythology identifies it as an archer, we see it as an obvious teapot with steam (the Milky Way) drifting upward from the spout. We’ll observe some of the magnificent objects in the vicinity of the teapot, then pick up the ...
... This constellation is easily found just east of the scorpion’s stinger. While Mythology identifies it as an archer, we see it as an obvious teapot with steam (the Milky Way) drifting upward from the spout. We’ll observe some of the magnificent objects in the vicinity of the teapot, then pick up the ...
Lecture 13
... • These stars have finished fusing H to He in their cores are no longer on the main sequence. • They may be fusing He to Carbon in their core or fusing H to He in shell outside the core … but there is no H to He fusion in the core. • All stars become larger and redder after exhausting their core hyd ...
... • These stars have finished fusing H to He in their cores are no longer on the main sequence. • They may be fusing He to Carbon in their core or fusing H to He in shell outside the core … but there is no H to He fusion in the core. • All stars become larger and redder after exhausting their core hyd ...
Star Maps and Constellations
... chases the bears around in circles, i.e. keeps them at the North pole ...
... chases the bears around in circles, i.e. keeps them at the North pole ...
Introduction to the sky
... object and extend that line to the horizon, we obtain the azimuth angle of the object. By convention, the north point on the horizon has azimuth 0 degrees, the east point has azimuth 90 degrees, the south point has azimuth 180 degrees, and the west point has azimuth 270 degrees. The problem with the ...
... object and extend that line to the horizon, we obtain the azimuth angle of the object. By convention, the north point on the horizon has azimuth 0 degrees, the east point has azimuth 90 degrees, the south point has azimuth 180 degrees, and the west point has azimuth 270 degrees. The problem with the ...
Introduction to the sky
... Just as we describe the location of a place on Earth by its latitude and longitude, we can specify the location of a star on the celestial sphere by its right ascension and declination. ...
... Just as we describe the location of a place on Earth by its latitude and longitude, we can specify the location of a star on the celestial sphere by its right ascension and declination. ...
Introduction to Stars: Their Properties
... 3. The Sun is the brightest star in the sky, with an apparent magnitude of about -26.5 Sirius is next in line, with an apparent magnitude of -1.5; how many times brighter is the Sun than Sirius? a) 25 ...
... 3. The Sun is the brightest star in the sky, with an apparent magnitude of about -26.5 Sirius is next in line, with an apparent magnitude of -1.5; how many times brighter is the Sun than Sirius? a) 25 ...
Lecture 11
... Meanwhile, down in the core, the C is becoming degenerate. Luminosity is becoming so great it blows the H envelope into space. ...
... Meanwhile, down in the core, the C is becoming degenerate. Luminosity is becoming so great it blows the H envelope into space. ...
Tour the sky`s reddest stars
... swings between magnitudes 3.6 and 5 during a period of roughly 2 years. These numbers, however, give only its apparent brightness. In reality, Mu ranks as one of the brightest and largest stars known. More than a billion Suns could fit inside Mu Cep, and, if it occupied our solar system’s center, it ...
... swings between magnitudes 3.6 and 5 during a period of roughly 2 years. These numbers, however, give only its apparent brightness. In reality, Mu ranks as one of the brightest and largest stars known. More than a billion Suns could fit inside Mu Cep, and, if it occupied our solar system’s center, it ...
Characterizing Stars - Department of Physics and Astronomy
... 1. How far away are the stars? 2. What evidence do astronomers have that the Sun is a typical star? 3. What is meant by a “first-magnitude” or “second magnitude” star? 4. Why are some stars red and others blue? 5. What are the stars made of? 6. As stars go, is our Sun especially large or small? 7. W ...
... 1. How far away are the stars? 2. What evidence do astronomers have that the Sun is a typical star? 3. What is meant by a “first-magnitude” or “second magnitude” star? 4. Why are some stars red and others blue? 5. What are the stars made of? 6. As stars go, is our Sun especially large or small? 7. W ...
Chapter 10 Hertzsprung-Russel Diagrams and Distance to Stars
... two bands, B − V (B minus V ), was called the B-V color index. Hot stars have a negative index and cooler stars a positive index since in the magnitude system, fainter measurements have greater magnitudes. The B-V color index depends only on a star’s Temperature. Modern astronomers use two other sys ...
... two bands, B − V (B minus V ), was called the B-V color index. Hot stars have a negative index and cooler stars a positive index since in the magnitude system, fainter measurements have greater magnitudes. The B-V color index depends only on a star’s Temperature. Modern astronomers use two other sys ...
The power plant of the Sun and stars
... Visual binaries…you can see them as two stars in a telescope Like Albireo, Sirius, Nu Draconis Alpha Geminorum: Castor ...
... Visual binaries…you can see them as two stars in a telescope Like Albireo, Sirius, Nu Draconis Alpha Geminorum: Castor ...