Lecture 5: The H-R diagram, standard candles and cosmic distances
... • Remember that for a spherical blackbody emitter, luminosity, temperature and radius are related by: L=4πR2 σT4 • Hence stars of a fixed size would populate a line from top left to bottom right - the main sequence is almost such a line • However, it is steeper - hotter stars on the MS are also l ...
... • Remember that for a spherical blackbody emitter, luminosity, temperature and radius are related by: L=4πR2 σT4 • Hence stars of a fixed size would populate a line from top left to bottom right - the main sequence is almost such a line • However, it is steeper - hotter stars on the MS are also l ...
Photons
... value of S λ . For the sake of comparison, the bottom panel presents the spectra of Vega (A0V), the Sun (G2V), and a M5 giant, in arbitrary scales of Fλ . ...
... value of S λ . For the sake of comparison, the bottom panel presents the spectra of Vega (A0V), the Sun (G2V), and a M5 giant, in arbitrary scales of Fλ . ...
Section 19.2
... of stars • If you look closely at the stars on a clear night, you might see a slight reddish or bluish tint to some stars. • This is because their surface temperatures are different. ...
... of stars • If you look closely at the stars on a clear night, you might see a slight reddish or bluish tint to some stars. • This is because their surface temperatures are different. ...
13 The Family of Stars
... Once many stars are plotted on an H–R diagram, a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence because this is where most stars are. The white dwarf region is also indicated; these stars ar ...
... Once many stars are plotted on an H–R diagram, a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence because this is where most stars are. The white dwarf region is also indicated; these stars ar ...
Brightness and Distance
... steradian (a unit of solid angle). It is important to note that luminous intensity takes into account the response of the human visual system. In other words, our eyes are not equally sensitive to all wavelengths of visible light. Since the response of the human eye to brightness is close to logarit ...
... steradian (a unit of solid angle). It is important to note that luminous intensity takes into account the response of the human visual system. In other words, our eyes are not equally sensitive to all wavelengths of visible light. Since the response of the human eye to brightness is close to logarit ...
H-R Diagram
... absolute magnitude. From such a diagram, other information about a star's properties and life cycle can be determined. A simplified H-R diagram appears in your textbook. In this laboratory, you will construct an H-R diagram using data on the 20 stars that are nearest to our sun (Figure 21.1) and the ...
... absolute magnitude. From such a diagram, other information about a star's properties and life cycle can be determined. A simplified H-R diagram appears in your textbook. In this laboratory, you will construct an H-R diagram using data on the 20 stars that are nearest to our sun (Figure 21.1) and the ...
CONSTELLATIONS
... As you have seen, the dashed line on the planisphere marks the ecliptic. As our Earth moves around in its orbit, the Sun, the Moon, and the planets also appear along this line. The ecliptic therefore represents the plane of the solar system. Of the nine planets, five are easily visible without a tel ...
... As you have seen, the dashed line on the planisphere marks the ecliptic. As our Earth moves around in its orbit, the Sun, the Moon, and the planets also appear along this line. The ecliptic therefore represents the plane of the solar system. Of the nine planets, five are easily visible without a tel ...
Some Facts and Hypotheses regard
... is Eta Argus, or Eta Carinoo, 59 degrees south (it can be well observed from Calcutta, but is too far south to be seen from En,gland or North Europe), which varies from the first magnitude as in 1843, down to the seventh magnitude; which is its present brightness. Between 1677, when Halley observed ...
... is Eta Argus, or Eta Carinoo, 59 degrees south (it can be well observed from Calcutta, but is too far south to be seen from En,gland or North Europe), which varies from the first magnitude as in 1843, down to the seventh magnitude; which is its present brightness. Between 1677, when Halley observed ...
chapter 2 - Test Bank, Manual Solution, Solution Manual
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
Astro 10 Practice Test 2
... Choose the ONE best answer and mark it on your Parscore form. (5 pts. each) 10. Which of these is a portion of the electromagnetic spectrum that can go through the Earth’s atmosphere? a. X-ray `light’ b. Ultraviolet light c. Gamma-ray `light’ d. Visible-wavelength light 11. The ____ of a star is a m ...
... Choose the ONE best answer and mark it on your Parscore form. (5 pts. each) 10. Which of these is a portion of the electromagnetic spectrum that can go through the Earth’s atmosphere? a. X-ray `light’ b. Ultraviolet light c. Gamma-ray `light’ d. Visible-wavelength light 11. The ____ of a star is a m ...
The Fate of Massive Stars
... increased opacity due to presence of various Ions (including Fe) in stellar atmosphere Diagonal upper-luminosity cutoff that is temperature dependent Hotter --> Higher Luminosity cutoff Greater mass-loss/stellar winds for cooler stars at lower luminosities Stellar winds important contribution to ISM ...
... increased opacity due to presence of various Ions (including Fe) in stellar atmosphere Diagonal upper-luminosity cutoff that is temperature dependent Hotter --> Higher Luminosity cutoff Greater mass-loss/stellar winds for cooler stars at lower luminosities Stellar winds important contribution to ISM ...
Astronomy Assignment #1
... stars to the Sun. Is the Sun like or unlike the brightest stars in the sky? Be detailed in your description. Second paragraph: Summarize the properties of the twenty nearest star systems and compare them to the Sun. Is the Sun like or unlike the nearest stars in the sky? Be detailed in your descript ...
... stars to the Sun. Is the Sun like or unlike the brightest stars in the sky? Be detailed in your description. Second paragraph: Summarize the properties of the twenty nearest star systems and compare them to the Sun. Is the Sun like or unlike the nearest stars in the sky? Be detailed in your descript ...
Draco: The Dragon - Courtney Stookey
... constellation. The star is referred to as ‘the serpent’. This is an orange giant that is about 148 light years distant. While Eltanin is the brightest star in the constellation, Thuban, or 3445 alpha Draconis, is not very noticeable in comparison. This star is referred to as ‘the basilisk’. Thuban i ...
... constellation. The star is referred to as ‘the serpent’. This is an orange giant that is about 148 light years distant. While Eltanin is the brightest star in the constellation, Thuban, or 3445 alpha Draconis, is not very noticeable in comparison. This star is referred to as ‘the basilisk’. Thuban i ...
Midterm Study Game
... What was Copernicus’ contribution to Astronomy? Copernicus was the scientist who first believed that the Sun was the center of the solar system, not the Earth AND that all the objects in our solar system revolve around the sun. Galileo also helped confirm this with his trusty telescope! ...
... What was Copernicus’ contribution to Astronomy? Copernicus was the scientist who first believed that the Sun was the center of the solar system, not the Earth AND that all the objects in our solar system revolve around the sun. Galileo also helped confirm this with his trusty telescope! ...
Document
... The amount of light a star gives off and its distance from Earth determines how bright it appears to an observer Parallax – the apparent shift in the position of an object when viewed from different locations ...
... The amount of light a star gives off and its distance from Earth determines how bright it appears to an observer Parallax – the apparent shift in the position of an object when viewed from different locations ...
ASTR2050 Spring 2005 •
... • Measuring the masses of stars • Measuring the sizes (radii) of stars ...
... • Measuring the masses of stars • Measuring the sizes (radii) of stars ...
Answers
... Why is the maximum temperature of the 40Msun star less than the maximum temperature of the 20 Msun star. Hint: Consider the different stages these two stars will go through during their lifetime, and the properties of the final stages. Both stars will become supergiants after leaving the Main Sequen ...
... Why is the maximum temperature of the 40Msun star less than the maximum temperature of the 20 Msun star. Hint: Consider the different stages these two stars will go through during their lifetime, and the properties of the final stages. Both stars will become supergiants after leaving the Main Sequen ...
8.1 Stars
... The area with the largest mass starts to pull more mass in. The matter pulled in has excess energy which causes the central ball of material to begin to spin. Extremely high pressures build up inside the ball, which in turn causes the tightly packed atoms to heat up. As the temperature climbs, the ...
... The area with the largest mass starts to pull more mass in. The matter pulled in has excess energy which causes the central ball of material to begin to spin. Extremely high pressures build up inside the ball, which in turn causes the tightly packed atoms to heat up. As the temperature climbs, the ...
Document
... When astronomers look through their telescopes, they see billions of stars. What can they learn fromThe goal of this problem set is for you to understand that astronomers classify stars on the basis of two different criteria: (1) the intensity of one of the H absorption lines (called H), and (2) on ...
... When astronomers look through their telescopes, they see billions of stars. What can they learn fromThe goal of this problem set is for you to understand that astronomers classify stars on the basis of two different criteria: (1) the intensity of one of the H absorption lines (called H), and (2) on ...
FREE Sample Here - We can offer most test bank and
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
FREE Sample Here
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
FREE Sample Here
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
... degrees, minutes of arc, and seconds of arc, and are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter. What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visi ...
Star - Uplift Education
... Calculation shows that the helium produced by nuclear fusion within stars cannot account for the real amount of helium in Universe (24%). In 1960 it was proposed that sometime during the early history of the Universe, long before any star, Universe was at a sufficiently high temperature to produce ...
... Calculation shows that the helium produced by nuclear fusion within stars cannot account for the real amount of helium in Universe (24%). In 1960 it was proposed that sometime during the early history of the Universe, long before any star, Universe was at a sufficiently high temperature to produce ...
PPT file
... Similar to our sun (stays like this for most of their life) These burn H fuel faster than low mass stars and last only about 10 billion years ...
... Similar to our sun (stays like this for most of their life) These burn H fuel faster than low mass stars and last only about 10 billion years ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.