E3 STELLAR DISTANCES E4 COSMOLOGY
... A main sequence star emits most of its energy at λ = 2.4 x 10-7 m. Its apparent brightness is measure at 4.3 x 10-9 W m-2. How far away is the star? [28 pc] ...
... A main sequence star emits most of its energy at λ = 2.4 x 10-7 m. Its apparent brightness is measure at 4.3 x 10-9 W m-2. How far away is the star? [28 pc] ...
ASTRONOMY 313
... 12. The quasar HS1946+7658 has such a large redshift that the Lyman series line Ly- of hydrogen at 1215 Å (corresponding to a transition between the first and second energy levels of neutral hydrogen atoms) is observed in the optical spectrum of HS1946+7658 to be in emission at a wavelength of 488 ...
... 12. The quasar HS1946+7658 has such a large redshift that the Lyman series line Ly- of hydrogen at 1215 Å (corresponding to a transition between the first and second energy levels of neutral hydrogen atoms) is observed in the optical spectrum of HS1946+7658 to be in emission at a wavelength of 488 ...
White Dwarfs - Astronomy - The University of Texas at Austin
... White Dwarfs (Section 5.1) Essentially every white dwarf formed since beginning of Galaxy is still here 10-100 billion of them (~ 100 billion stars total) Most are dim, undiscovered, see only those nearby, none naked eye Sirius, brightest star in the sky, has a white dwarf companion. Can’t see the ...
... White Dwarfs (Section 5.1) Essentially every white dwarf formed since beginning of Galaxy is still here 10-100 billion of them (~ 100 billion stars total) Most are dim, undiscovered, see only those nearby, none naked eye Sirius, brightest star in the sky, has a white dwarf companion. Can’t see the ...
Herzsprung-Russell Diagram
... Only 6 of the 20 brightest stars in the sky are closer to us than 10pc 14 of the 20 brightest stars in the sky must have absolute magnitude of at least 1.5 (20 times brighter than the Sun) Out of the 6000 stars visible, only 50 are dimmer than the Sun in absolute magnitude. Question: Is the Sun be ...
... Only 6 of the 20 brightest stars in the sky are closer to us than 10pc 14 of the 20 brightest stars in the sky must have absolute magnitude of at least 1.5 (20 times brighter than the Sun) Out of the 6000 stars visible, only 50 are dimmer than the Sun in absolute magnitude. Question: Is the Sun be ...
mass per nucleon
... main sequence star (core Hydrogen burning) core Hydrogen exhausted (sub-giant) shell Hydrogen burning (red giant) core Helium burning (Helium Flash) shell Helium burning (double-shell burning red giant) planetary nebula white dwarf ...
... main sequence star (core Hydrogen burning) core Hydrogen exhausted (sub-giant) shell Hydrogen burning (red giant) core Helium burning (Helium Flash) shell Helium burning (double-shell burning red giant) planetary nebula white dwarf ...
Supernovae, Neutron Stars, Black Holes
... might have triggered the collapse of the huge interstellar cloud in which the Sun formed. ...
... might have triggered the collapse of the huge interstellar cloud in which the Sun formed. ...
Exploring the Universe
... the universe was compressed into an extremely small volume that 10 to 20 billion years ago exploded and began expanding in all directions ...
... the universe was compressed into an extremely small volume that 10 to 20 billion years ago exploded and began expanding in all directions ...
Brightness + Magnitude of Stars
... A. Apparent or Relative Brightness-(cont.) *** As distance to Star Decreases brightness Increases (Inverse Relationship) *** As Luminosity of Star increases brightness Increases (Direct Relationship) B. Apparent Magnitude A number assigned to a celestial object that is a measure of its relative br ...
... A. Apparent or Relative Brightness-(cont.) *** As distance to Star Decreases brightness Increases (Inverse Relationship) *** As Luminosity of Star increases brightness Increases (Direct Relationship) B. Apparent Magnitude A number assigned to a celestial object that is a measure of its relative br ...
Lecture 5: Light as a tool
... Apparent magnitude tells us nothing about the luminosity of the objects, but it tell us how difficult it is to see the objects in the sky. Absolute magnitude, on the other hand, is directly related to the luminosity of the object. But it does not tell us how bright they appear in the sky. ...
... Apparent magnitude tells us nothing about the luminosity of the objects, but it tell us how difficult it is to see the objects in the sky. Absolute magnitude, on the other hand, is directly related to the luminosity of the object. But it does not tell us how bright they appear in the sky. ...
Astronomy
... 22. Which spectral class of stars (which letter) have the lowest temperature? _____________ ...
... 22. Which spectral class of stars (which letter) have the lowest temperature? _____________ ...
Review3-2016
... How do we use the atomic emission and absorption spectra to find the composition of a star? How do we determine the rotation period of a star? How do we determine the distance to a star using Stellar Parallax? What is an H-R diagram and what information does it give us? One of the Ca spectral lines ...
... How do we use the atomic emission and absorption spectra to find the composition of a star? How do we determine the rotation period of a star? How do we determine the distance to a star using Stellar Parallax? What is an H-R diagram and what information does it give us? One of the Ca spectral lines ...
1705 chart front
... The Big Dipper is not officially a constellation; it’s what astronomers sometimes call an asterism. The Big Dipper is a familiar name for this pattern of stars, especially known to observers in the United States, but it’s not one of the 88 constellations recognized by astronomers worldwide. Ursa Maj ...
... The Big Dipper is not officially a constellation; it’s what astronomers sometimes call an asterism. The Big Dipper is a familiar name for this pattern of stars, especially known to observers in the United States, but it’s not one of the 88 constellations recognized by astronomers worldwide. Ursa Maj ...
galaxy
... Nuclear Fusion hydrogen atoms fuse into helium creating the intense energy found in stars ...
... Nuclear Fusion hydrogen atoms fuse into helium creating the intense energy found in stars ...
Stellar Classification Worksheet 2
... Explain how each of the 5 characteristics in the boxes below is used to classify stars. In each box, give 2 examples of stars and their specific characteristics. Use pages 127-129 in the textbook and the examples below to complete the worksheet. ...
... Explain how each of the 5 characteristics in the boxes below is used to classify stars. In each box, give 2 examples of stars and their specific characteristics. Use pages 127-129 in the textbook and the examples below to complete the worksheet. ...
Useful Things to Study (#2)
... Relationship between parallax of stars and their distances What is a “parsec”? What are stellar radial velocities? Proper motions? Inverse square law of light intensity What do we mean by the “absolute magnitude” of a star? What does this mean? M = m + 5 - 5 log d? (The apparent magnitudes have to ...
... Relationship between parallax of stars and their distances What is a “parsec”? What are stellar radial velocities? Proper motions? Inverse square law of light intensity What do we mean by the “absolute magnitude” of a star? What does this mean? M = m + 5 - 5 log d? (The apparent magnitudes have to ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.