29.2 - Stars - s3.amazonaws.com
... • A star is a body of gases that gives off a tremendous amount of radiant energy in the form of light and heat • Appear to be tiny specks of white light • Most vary in color and are much larger than ...
... • A star is a body of gases that gives off a tremendous amount of radiant energy in the form of light and heat • Appear to be tiny specks of white light • Most vary in color and are much larger than ...
E1 Introduction to the universe
... The surface temperature drops, but the luminosity increases due to greater surface area! The helium in the core fuses into oxygen and carbon…. They fuse to form silicon. The helium in the outer layers is then ejected, (A planetary nebula is an astronomical object consisting of a glowing shell of gas ...
... The surface temperature drops, but the luminosity increases due to greater surface area! The helium in the core fuses into oxygen and carbon…. They fuse to form silicon. The helium in the outer layers is then ejected, (A planetary nebula is an astronomical object consisting of a glowing shell of gas ...
UniverseofGalaxies
... divided into SBa, SBb, SBc, with similar characteristics to regular spirals, except for a centrallyoriented bar ...
... divided into SBa, SBb, SBc, with similar characteristics to regular spirals, except for a centrallyoriented bar ...
Lecture 12
... The relationship between redshift and distance is linear for low values of z, but becomes rather complex when we look at very distant objects (very far back in time). As the Universe expands the value of H0 changes as the geometry of the Universe changes. Partly this is a ‘standard’ result from appl ...
... The relationship between redshift and distance is linear for low values of z, but becomes rather complex when we look at very distant objects (very far back in time). As the Universe expands the value of H0 changes as the geometry of the Universe changes. Partly this is a ‘standard’ result from appl ...
Sample Exam for 3 rd Astro Exam
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
d = 1 / p
... if we know the total power emitted by a star (its luminosity), and we know its temperature from Wien's law, we can calculate its total surface area – and determine its size. To do this in practice, first find the energy per second emitted by each unit of surface area, ε, using the relation given in ...
... if we know the total power emitted by a star (its luminosity), and we know its temperature from Wien's law, we can calculate its total surface area – and determine its size. To do this in practice, first find the energy per second emitted by each unit of surface area, ε, using the relation given in ...
M104: The Sombrero Galaxy
... earliest known ape-like ancestors appeared on our planet. A relatively bright galaxy, the Sombrero lies just beyond the limit of the naked eye and is easily visible through the telescopes of amateur stargazers. The hat-shaped galaxy contains several hundred billion stars, about 100 times as many sta ...
... earliest known ape-like ancestors appeared on our planet. A relatively bright galaxy, the Sombrero lies just beyond the limit of the naked eye and is easily visible through the telescopes of amateur stargazers. The hat-shaped galaxy contains several hundred billion stars, about 100 times as many sta ...
1 au d p = 1 au d
... Local luminosity function (stars with d < 20 pc) for the Milky Way measured by Kroupa, Tout & Gilmore (1993): ...
... Local luminosity function (stars with d < 20 pc) for the Milky Way measured by Kroupa, Tout & Gilmore (1993): ...
d = 1 / p
... A quick glance at the night sky will tell you that different stars have different brightnesses. But how much of that effect is due to the fact that some stars are further away, and how much is due to certain stars being intrinsically brighter? If we know the distances from parallax, we can remove th ...
... A quick glance at the night sky will tell you that different stars have different brightnesses. But how much of that effect is due to the fact that some stars are further away, and how much is due to certain stars being intrinsically brighter? If we know the distances from parallax, we can remove th ...
Stellar Physics Lecture 1
... Is there any correlation between these parameters? – Very important result - a plot of luminosity versus temperature (spectral class) – The Hertzprung-Russel (H-R) Diagram ...
... Is there any correlation between these parameters? – Very important result - a plot of luminosity versus temperature (spectral class) – The Hertzprung-Russel (H-R) Diagram ...
Mass Segregation in Globular Clusters
... Because the light in the telescopic image of a star is spread over several adjacent pixels, we exercised extreme care and control to ensure positional accuracy. By carefully selecting the ACS filter through which the observations were made, the two target groups of stars with very different masses ...
... Because the light in the telescopic image of a star is spread over several adjacent pixels, we exercised extreme care and control to ensure positional accuracy. By carefully selecting the ACS filter through which the observations were made, the two target groups of stars with very different masses ...
Stars: from Adolescence to Old Age
... A comparison of the prediction for a hypothetical 4.24-billion-year-old cluster (left) with measurements of stars in the globular cluster 47 Tucanae (right) The theory appears to be roughly consistent with observation 4 August 2005 ...
... A comparison of the prediction for a hypothetical 4.24-billion-year-old cluster (left) with measurements of stars in the globular cluster 47 Tucanae (right) The theory appears to be roughly consistent with observation 4 August 2005 ...
REACH FOR THE STARS MLK 2009
... How long does an O star live on the main sequence? Several million years. How long does a G star live on the main sequence? Several billion years. How long does an M star live on the main sequence? Perhaps a trillion years. Why are there no black dwarfs? The universe is not old enough. What obscures ...
... How long does an O star live on the main sequence? Several million years. How long does a G star live on the main sequence? Several billion years. How long does an M star live on the main sequence? Perhaps a trillion years. Why are there no black dwarfs? The universe is not old enough. What obscures ...
M104: The Sombrero Galaxy
... earliest known ape-like ancestors appeared on our planet. A relatively bright galaxy, the Sombrero lies just beyond the limit of the naked eye and is easily visible through the telescopes of amateur stargazers. The hat-shaped galaxy contains several hundred billion stars, about 100 times as many sta ...
... earliest known ape-like ancestors appeared on our planet. A relatively bright galaxy, the Sombrero lies just beyond the limit of the naked eye and is easily visible through the telescopes of amateur stargazers. The hat-shaped galaxy contains several hundred billion stars, about 100 times as many sta ...
Measuring Stellar Distances
... moment – suppose you had no prior knowledge of what stars actually were – that you lived in a time where they could be anything. If you simply look up into the night sky you have no idea how far away these objects are or whether or not they are part of our atmosphere, in our solar system, or located ...
... moment – suppose you had no prior knowledge of what stars actually were – that you lived in a time where they could be anything. If you simply look up into the night sky you have no idea how far away these objects are or whether or not they are part of our atmosphere, in our solar system, or located ...
North Star pulses brightly with constant change
... The other is that Polaris is the closest Cepheid variable. I've written before about these special types of variable stars, which give us one of the best ways of measuring the size of the universe. Cepheid variable stars pulsate, getting larger and brighter, and smaller and fainter, in a regular cyc ...
... The other is that Polaris is the closest Cepheid variable. I've written before about these special types of variable stars, which give us one of the best ways of measuring the size of the universe. Cepheid variable stars pulsate, getting larger and brighter, and smaller and fainter, in a regular cyc ...
STUDY GUIDE:
... system explode in the course of a day. Temporarily, this can make their system 300,000 times brighter than the sun. This brightness lasts for a few days or weeks, and then lessens gradually, leaving the stars about the same as they were before. In 1992, Nova Cygni, in the northern constellation Cygn ...
... system explode in the course of a day. Temporarily, this can make their system 300,000 times brighter than the sun. This brightness lasts for a few days or weeks, and then lessens gradually, leaving the stars about the same as they were before. In 1992, Nova Cygni, in the northern constellation Cygn ...
Stellar Birth - Chabot College
... Star Formation in 4 Steps! Start with Large Cloud of Gas & Dust 1. Shock creates fragments & “blobs” 2. Gravity creates clusters of star “seeds” 3. Individual blobs heat up and glow as protostars 4. Protostars start fusion in cores ...
... Star Formation in 4 Steps! Start with Large Cloud of Gas & Dust 1. Shock creates fragments & “blobs” 2. Gravity creates clusters of star “seeds” 3. Individual blobs heat up and glow as protostars 4. Protostars start fusion in cores ...
EVOLUTION OF A SOLAR
... The Life and Death of a Sun-like Star These notes describe the evolutionary path taken by a Sun-like star, one with an initial mass comparable to the Sun’s mass. Stars can be thought of as a series of nested shells, surrounding a core. The core is more dense, hotter, and at higher pressure than the ...
... The Life and Death of a Sun-like Star These notes describe the evolutionary path taken by a Sun-like star, one with an initial mass comparable to the Sun’s mass. Stars can be thought of as a series of nested shells, surrounding a core. The core is more dense, hotter, and at higher pressure than the ...
Dynamics of elliptical galaxies
... effective radius Re - radius of a circle which contains half of the total light in the galaxy. Measure three apparently independent properties; • The effective radius Re • The central velocity dispersion s • The surface brightness at the effective radius Ie=I(Re) Plot these quantities in three dimen ...
... effective radius Re - radius of a circle which contains half of the total light in the galaxy. Measure three apparently independent properties; • The effective radius Re • The central velocity dispersion s • The surface brightness at the effective radius Ie=I(Re) Plot these quantities in three dimen ...
Tyler Gray - Angelfire
... on their own (the only possible exception may be M54 which may belong to SagDEG, a small galaxy which is currently in a close encounter with the Milky Way, and thus our closest known intergalactic neighbor). See our Messier Objects in the Milky Way page, where details are given for each object to w ...
... on their own (the only possible exception may be M54 which may belong to SagDEG, a small galaxy which is currently in a close encounter with the Milky Way, and thus our closest known intergalactic neighbor). See our Messier Objects in the Milky Way page, where details are given for each object to w ...
Astronomy 111 – Lecture 2
... • All cultures have populated the night sky with constellations. • Most constellations are composed of bright stars that stand out from the others. • Many are named after their appearance. • Peoples greatly separated in distance and/or time often made the same connections. A few common examples: – O ...
... • All cultures have populated the night sky with constellations. • Most constellations are composed of bright stars that stand out from the others. • Many are named after their appearance. • Peoples greatly separated in distance and/or time often made the same connections. A few common examples: – O ...
10.5 The Hertzsprung
... 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, as this is where most stars are. Also indicated is the white dwarf region; these stars are hot but not very luminous, as they are quite s ...
... 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, as this is where most stars are. Also indicated is the white dwarf region; these stars are hot but not very luminous, as they are quite s ...
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.