Star and Galaxies Chapter 13
... • Galaxies: large group of stars, gas and dust held together by gravity • Earth and our solar system belong to the Milky Way Galaxy which is made of a trillion stars • It is found close to 45 other galaxies known as the Local Group • These galaxies are separated by millions of light years. ...
... • Galaxies: large group of stars, gas and dust held together by gravity • Earth and our solar system belong to the Milky Way Galaxy which is made of a trillion stars • It is found close to 45 other galaxies known as the Local Group • These galaxies are separated by millions of light years. ...
2.1 Introduction
... Figure 2.2: Proper motion of Barnard’s star. This low-mass red dwarf is the fourth closest star to the Sun after the three components of the α Cen system, at a distance of 1.83 pc (θ = 0.545 arcsec), and has the highest measured proper motion, µ = 10.4 arcsec yr−1 . ...
... Figure 2.2: Proper motion of Barnard’s star. This low-mass red dwarf is the fourth closest star to the Sun after the three components of the α Cen system, at a distance of 1.83 pc (θ = 0.545 arcsec), and has the highest measured proper motion, µ = 10.4 arcsec yr−1 . ...
Star and Galaxies Chapter 13 2013
... • Galaxies: large group of stars, gas and dust held together by gravity • Earth and our solar system belong to the Milky Way Galaxy which is made of a trillion stars • It is found close to 45 other galaxies known as the Local Group • These galaxies are separated by millions of light years. ...
... • Galaxies: large group of stars, gas and dust held together by gravity • Earth and our solar system belong to the Milky Way Galaxy which is made of a trillion stars • It is found close to 45 other galaxies known as the Local Group • These galaxies are separated by millions of light years. ...
lect3 — 1 Measuring stars: What can be measured?
... main sequence star very far away; they are just not that bright. Worse, the brightest (OB) stars tend to be somewhat variable, and their color doesn’t translate into luminosity quite so tightly as for something like the Sun. Cepheids: Classically, this is the most reliable stellar standard candle. T ...
... main sequence star very far away; they are just not that bright. Worse, the brightest (OB) stars tend to be somewhat variable, and their color doesn’t translate into luminosity quite so tightly as for something like the Sun. Cepheids: Classically, this is the most reliable stellar standard candle. T ...
Lecture Eleven (Powerpoint format)
... way through the treacherous ground that characterizes research at the frontiers of science." Frank Shu (contemporary astrophysicist) "As to relativity, I must confess that I would rather have a subject in which there would be a half dozen members of the Academy competent enough to understand at le ...
... way through the treacherous ground that characterizes research at the frontiers of science." Frank Shu (contemporary astrophysicist) "As to relativity, I must confess that I would rather have a subject in which there would be a half dozen members of the Academy competent enough to understand at le ...
Galaxies - Mike Brotherton
... M87 = Central, giant elliptical galaxy in the Virgo cluster of galaxies Optical and radio observations detect a jet with velocities up to ~ 1/2 c. ...
... M87 = Central, giant elliptical galaxy in the Virgo cluster of galaxies Optical and radio observations detect a jet with velocities up to ~ 1/2 c. ...
Lecture 6
... If the distance between Earth and the Sun were cut in half, how much brighter would the sun appear in our sky? a. 2x brighter b. 4x brighter c. 8x brighter d. 16x brighter Brightness is a function of the inverse square of distance, so if distance was cut by half it would get brighter by 4x=1/(.5)2 ...
... If the distance between Earth and the Sun were cut in half, how much brighter would the sun appear in our sky? a. 2x brighter b. 4x brighter c. 8x brighter d. 16x brighter Brightness is a function of the inverse square of distance, so if distance was cut by half it would get brighter by 4x=1/(.5)2 ...
Critical Thinking Questions: (work on these with a partner) Post
... do. Both types of stars undergo nuclear fusion and have an outer shell influenced by gravity. Explain why a star like our Sun will not go supernova, but a super-massive star will. Explain your answer describing the processes of nuclear fusion and gravitational force. Because a super-massive star has ...
... do. Both types of stars undergo nuclear fusion and have an outer shell influenced by gravity. Explain why a star like our Sun will not go supernova, but a super-massive star will. Explain your answer describing the processes of nuclear fusion and gravitational force. Because a super-massive star has ...
E3 – Stellar distances
... • At distances greater than Mpc, neither parallax nor spectroscopic parallax can be relied upon to measure the distance to a star. • When we observe another galaxy, all of the stars in that galaxy are approximately the same distance away from the earth. What we really need is a light source of known ...
... • At distances greater than Mpc, neither parallax nor spectroscopic parallax can be relied upon to measure the distance to a star. • When we observe another galaxy, all of the stars in that galaxy are approximately the same distance away from the earth. What we really need is a light source of known ...
Life and Evolution of a Massive Star
... • A star that is so massive that it collapses past the neutron degeneracy limit will become a black hole • The result is a singularity ...
... • A star that is so massive that it collapses past the neutron degeneracy limit will become a black hole • The result is a singularity ...
IB_Op_F_04 - Effectsmeister
... Which spectral class is most common? Which spectral class is the least common? In general, what is the relationship between the temperature of a star and its brightness? Most of the stars seem to be along a line from the upper left corner to the lower right corner of the HR Diagram. Stars which fall ...
... Which spectral class is most common? Which spectral class is the least common? In general, what is the relationship between the temperature of a star and its brightness? Most of the stars seem to be along a line from the upper left corner to the lower right corner of the HR Diagram. Stars which fall ...
Deep Space (PDF: 224k)
... during its entire lifetime! This is a supernova explosion that expels material at 10 percent the speed of light and leaves behind a black hole. Stars with initial masses between eight and 50 times that of the Sun do not evolve to the Wolf-Rayet stage; they never completely lose the hydrogen in their ...
... during its entire lifetime! This is a supernova explosion that expels material at 10 percent the speed of light and leaves behind a black hole. Stars with initial masses between eight and 50 times that of the Sun do not evolve to the Wolf-Rayet stage; they never completely lose the hydrogen in their ...
The Stars
... • What is the difference between apparent and absolute magnitude? • What two factors cause luminosity to increase? • What are the spectral classes? • Why is a blue star more luminous than a yellow star of the same size? • What does the H-R diagram show us about most stars (main sequence stars)? • Wh ...
... • What is the difference between apparent and absolute magnitude? • What two factors cause luminosity to increase? • What are the spectral classes? • Why is a blue star more luminous than a yellow star of the same size? • What does the H-R diagram show us about most stars (main sequence stars)? • Wh ...
Oct 06, 2001
... This is a” thinking” question: Star A appears brighter than Star B, but Star A actually gives off less energy than Star B. The apparent magnitude and absolute magnitudes for Star A are m = 1 and M = -2, respectively. Use this information to answer the following two questions. 13) Which of the follow ...
... This is a” thinking” question: Star A appears brighter than Star B, but Star A actually gives off less energy than Star B. The apparent magnitude and absolute magnitudes for Star A are m = 1 and M = -2, respectively. Use this information to answer the following two questions. 13) Which of the follow ...
ASTR 101 Scale of the Universe: an Overview
... What is the shape of the milky way? Where is the Sun’s location in it? What is the estimated number of stars in the Milky way, what is its diameter? Can we see all of the Milky way galaxy from Earth? What is the reason we see Milky way as a luminous cloud? What is most distant object in the universe ...
... What is the shape of the milky way? Where is the Sun’s location in it? What is the estimated number of stars in the Milky way, what is its diameter? Can we see all of the Milky way galaxy from Earth? What is the reason we see Milky way as a luminous cloud? What is most distant object in the universe ...
+(J - cloudfront.net
... The radius RoftheSun is 7.0 x 108 m.Use your answers in (c) to deduce that the radius of Antares is about 500 R. ...
... The radius RoftheSun is 7.0 x 108 m.Use your answers in (c) to deduce that the radius of Antares is about 500 R. ...
Astronomical terms and constants
... mbol = Mbol + 5 log (d/10pc) = apparent bolometric magnitude of a star at a distance d . V = MV + 5 log (d/10pc) = apparent “visual” magnitude of a star as seen in the sky. B = MB + 5 log (d/10pc) = apparent “blue” magnitude of a star as seen in the sky. B − V = MB − MV = a difference between “visua ...
... mbol = Mbol + 5 log (d/10pc) = apparent bolometric magnitude of a star at a distance d . V = MV + 5 log (d/10pc) = apparent “visual” magnitude of a star as seen in the sky. B = MB + 5 log (d/10pc) = apparent “blue” magnitude of a star as seen in the sky. B − V = MB − MV = a difference between “visua ...
stargazing - davis.k12.ut.us
... Earth are the celestial bodies you see in the universe, the space that consists of all matter, all light and all forms of radiation and energy. Stars are so far away that our present mode of space travel would take more than a lifetime to reach the nearest star. Planets in our solar system would tak ...
... Earth are the celestial bodies you see in the universe, the space that consists of all matter, all light and all forms of radiation and energy. Stars are so far away that our present mode of space travel would take more than a lifetime to reach the nearest star. Planets in our solar system would tak ...
Pistol Star - University of Dayton
... Way than we are, and isn't visible to the naked eye on account of galactic dust. It's about 100 times the size of our sun, and burns 10,000,000 times as ...
... Way than we are, and isn't visible to the naked eye on account of galactic dust. It's about 100 times the size of our sun, and burns 10,000,000 times as ...
Our Galaxy -- The Milky Way PowerPoint
... • The visible mass cannot account for this mass • Much of the mass beyond the Sun is “dark matter” ...
... • The visible mass cannot account for this mass • Much of the mass beyond the Sun is “dark matter” ...
01.05.10 Centuries-Old Star Mystery Coming to a Close For almost
... meeting of the American Astronomical Meeting in Washington. Epsilon Aurigae can be seen at night from the northern hemisphere with the naked eye, even in some urban areas. Last August, it began its roughly two-year dimming, an event that happens like clockwork every 27.1 years and results in the sta ...
... meeting of the American Astronomical Meeting in Washington. Epsilon Aurigae can be seen at night from the northern hemisphere with the naked eye, even in some urban areas. Last August, it began its roughly two-year dimming, an event that happens like clockwork every 27.1 years and results in the sta ...
word document - FacStaff Home Page for CBU
... _____ f) Vega is a star that has a stellar classification of A0 V. From this we can infer that Vega is more massive than the sun. _____ g) The heaviest elements (gold, lead, uranium, etc.) are thought to be made in supernova explosions and not in the interior of stars like carbon and oxygen are. ___ ...
... _____ f) Vega is a star that has a stellar classification of A0 V. From this we can infer that Vega is more massive than the sun. _____ g) The heaviest elements (gold, lead, uranium, etc.) are thought to be made in supernova explosions and not in the interior of stars like carbon and oxygen are. ___ ...
Classification_of_Stars_By_Luminosity
... He called the brightest stars in the sky first magnitude and the dimmest visible to the naked eye sixth magnitude. Stars of intermediate brightness were given intermediate values. ...
... He called the brightest stars in the sky first magnitude and the dimmest visible to the naked eye sixth magnitude. Stars of intermediate brightness were given intermediate values. ...
The magnitude scale, parallax, the parsec, and Cepheid distances
... Typically magnitudes are measured through a specific filter or bandpass Filters only allow light from a specifice wavelength range through Examples are ugriz or BVRI in the op;cal or YJHK in the near-‐IR ...
... Typically magnitudes are measured through a specific filter or bandpass Filters only allow light from a specifice wavelength range through Examples are ugriz or BVRI in the op;cal or YJHK in the near-‐IR ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.