Notes 6 - University of Northern Iowa
... layer producing more carbon and oxygen. This goes on until the helium fusion layer reaches the base of the old hydrogen fusion layer. The presence of the hot helium fusion layer causes the hydrogen fusion to start up again, which has a stabilizing effect on the core. Since hydrogen fusion produces ...
... layer producing more carbon and oxygen. This goes on until the helium fusion layer reaches the base of the old hydrogen fusion layer. The presence of the hot helium fusion layer causes the hydrogen fusion to start up again, which has a stabilizing effect on the core. Since hydrogen fusion produces ...
memphis astronomical society short course in astronomy 2015
... astronomical distance scales; the Milky Way and its contents, including stars, clusters, and nebulae; the range of the human eye; the changing appearance of the Milky Way with the seasons; and other galaxies and their enormous distances from us. https://www.youtube.com/watch?v=wdgm204GYBQ ...
... astronomical distance scales; the Milky Way and its contents, including stars, clusters, and nebulae; the range of the human eye; the changing appearance of the Milky Way with the seasons; and other galaxies and their enormous distances from us. https://www.youtube.com/watch?v=wdgm204GYBQ ...
MS Word version
... Sidereal Time is used to describe the rotation of Earth and is needed to accurately point telescopes and keep track of the positions of objects in the sky. A sidereal day is the time needed for one complete rotation of Earth and is approximately 23 hours and 56 minutes long. If Earth were rotating i ...
... Sidereal Time is used to describe the rotation of Earth and is needed to accurately point telescopes and keep track of the positions of objects in the sky. A sidereal day is the time needed for one complete rotation of Earth and is approximately 23 hours and 56 minutes long. If Earth were rotating i ...
star
... The Expanding Universe The observed red shift in the spectra of galaxies shows that the universe is expanding. The Doppler effect can be used to determine how fast stars or galaxies are approaching or moving away from Earth. • When a star or galaxy is approaching Earth, the lines in its spectrum ar ...
... The Expanding Universe The observed red shift in the spectra of galaxies shows that the universe is expanding. The Doppler effect can be used to determine how fast stars or galaxies are approaching or moving away from Earth. • When a star or galaxy is approaching Earth, the lines in its spectrum ar ...
Properties of Ellipticals and Spirals
... Spirals have Gas and Dust and Young Stars – continual star formation Ellipicals are devoid of gas and dust and can no longer form young stars Ellipicals have old stars – but they have high metallicity Kinematics: Ellipticals: Velocities of stars in ellipticals are more or less random Velocity disper ...
... Spirals have Gas and Dust and Young Stars – continual star formation Ellipicals are devoid of gas and dust and can no longer form young stars Ellipicals have old stars – but they have high metallicity Kinematics: Ellipticals: Velocities of stars in ellipticals are more or less random Velocity disper ...
Constellation Classification Cards*
... scale is equal to the brightness of Alpha Lyrae, the brightest star in the constellation Lyra. Negative numbers, e.g., Sirius = -1.46, are the brightest stars; the highest positive numbers, e.g., Thuban = 3.65, are the dimmest stars. For Set B, there are six cards with three numbers. Stars with thre ...
... scale is equal to the brightness of Alpha Lyrae, the brightest star in the constellation Lyra. Negative numbers, e.g., Sirius = -1.46, are the brightest stars; the highest positive numbers, e.g., Thuban = 3.65, are the dimmest stars. For Set B, there are six cards with three numbers. Stars with thre ...
Inquiry 4
... Record the compass direction of the rising Sun in Table 1. 7. Put the screen into play again. At solar noon (when the shadows are the shortest for that day), stop the screen. Find the Sun in the sky. Put your cursor on the Sun, turn the cursor to an arrow, click and drag the arrow down to the horizo ...
... Record the compass direction of the rising Sun in Table 1. 7. Put the screen into play again. At solar noon (when the shadows are the shortest for that day), stop the screen. Find the Sun in the sky. Put your cursor on the Sun, turn the cursor to an arrow, click and drag the arrow down to the horizo ...
The Death of High Mass Stars
... Jocelyn Bell, who measured this radio signal from an unresolved source (named LGM-1). Her advisor Antony Hewish was studying the scintillation (twinkling) of radio light from distant sources caused by charged particles in our solar system. This required observations with time resolution of ~1/10th s ...
... Jocelyn Bell, who measured this radio signal from an unresolved source (named LGM-1). Her advisor Antony Hewish was studying the scintillation (twinkling) of radio light from distant sources caused by charged particles in our solar system. This required observations with time resolution of ~1/10th s ...
MS Word version
... Sidereal Time is used to describe the rotation of Earth and is needed to accurately point telescopes and keep track of the positions of objects in the sky. A sidereal day is the time needed for one complete rotation of Earth and is approximately 23 hours and 56 minutes long. If Earth were rotating i ...
... Sidereal Time is used to describe the rotation of Earth and is needed to accurately point telescopes and keep track of the positions of objects in the sky. A sidereal day is the time needed for one complete rotation of Earth and is approximately 23 hours and 56 minutes long. If Earth were rotating i ...
The Gould Belt
... Pöppel has pointed out [26] that only the relatively near stars no later than spectral class B2.5 can be said reliably to belong to the Gould belt. There are, however, very few of them. In order to assign stars from other spectral classes to the belt, various methods of distinguishing the stars fro ...
... Pöppel has pointed out [26] that only the relatively near stars no later than spectral class B2.5 can be said reliably to belong to the Gould belt. There are, however, very few of them. In order to assign stars from other spectral classes to the belt, various methods of distinguishing the stars fro ...
main characteristics of the emission from elliptical galaxies
... Elliptical galaxies are one of the most characteristic objects we can nd in the sky. In order to unveil their properties, such as their structure or chemical composition, one must study their spectral emission. In fact they seem to behave rather dierently when observed with dierent eyes. This is ...
... Elliptical galaxies are one of the most characteristic objects we can nd in the sky. In order to unveil their properties, such as their structure or chemical composition, one must study their spectral emission. In fact they seem to behave rather dierently when observed with dierent eyes. This is ...
Reading Science!
... sky. This light is then directed into an instrument attached to the telescope, which makes the object appear bigger and brighter. An astronomer can then study the object in great detail. Scientists who study the night sky observe asteroids, planets, star clusters, stars, black holes, nebulae, comets ...
... sky. This light is then directed into an instrument attached to the telescope, which makes the object appear bigger and brighter. An astronomer can then study the object in great detail. Scientists who study the night sky observe asteroids, planets, star clusters, stars, black holes, nebulae, comets ...
Printer-friendly Version
... " ... The random error on a profile is determined by two contributions that we mentioned before: (1) the measurement noise which changes from one stellar source to another due to star magnitude and temperature differences, and (2) the uncorrected residual scintillation component. At the time of wri ...
... " ... The random error on a profile is determined by two contributions that we mentioned before: (1) the measurement noise which changes from one stellar source to another due to star magnitude and temperature differences, and (2) the uncorrected residual scintillation component. At the time of wri ...
Stellar Physics 1
... A. A hot dense gas produces a continuous spectrum with no spectral lines. B. A hot diffuse gas produces bright spectral lines – an emission spectrum. C. A cool dense gas produces a continuous spectrum with no spectral lines. y D. A cool diffuse gas in front of a source of continuous spectrum produce ...
... A. A hot dense gas produces a continuous spectrum with no spectral lines. B. A hot diffuse gas produces bright spectral lines – an emission spectrum. C. A cool dense gas produces a continuous spectrum with no spectral lines. y D. A cool diffuse gas in front of a source of continuous spectrum produce ...
CHAPTER 12—STELLAR EVOLUTION
... ____ 27. Stars support their weight by generating energy in their centers. ____ 28. Stars swell into giants when hydrogen is exhausted in their centers. ____ 29. The helium flash is the cause of some supernovae. ____ 30. Helium fusion does not begin until the star has entered the giant region of the ...
... ____ 27. Stars support their weight by generating energy in their centers. ____ 28. Stars swell into giants when hydrogen is exhausted in their centers. ____ 29. The helium flash is the cause of some supernovae. ____ 30. Helium fusion does not begin until the star has entered the giant region of the ...
AST1100 Lecture Notes
... by the Sun, not the planets. The total mass of the planets only make up about one part in 1000 of the total mass of the solar system. If this is the normal ratio, and we have no reason to believe otherwise, then the planets can only explain a tiny part of the invisible matter. Brown dwarf stars (mor ...
... by the Sun, not the planets. The total mass of the planets only make up about one part in 1000 of the total mass of the solar system. If this is the normal ratio, and we have no reason to believe otherwise, then the planets can only explain a tiny part of the invisible matter. Brown dwarf stars (mor ...
Chandra, Spitzer & VLA Observations of Young Clusters Scott Wolk - CxC/CfA
... Burkett and Hartmann (2004) ...
... Burkett and Hartmann (2004) ...
A Collection of Curricula for the STARLAB Deep Sky Objects
... Nebulae absorb light from nearby stars and radiate it back into space. Most nebulae glow red, the color of hydrogen gas. The brightest nebula is the Orion Nebula (see slide #60) which can be seen with the unaided eye in a dark sky. Nebulae are very important in astronomy because they are the key to ...
... Nebulae absorb light from nearby stars and radiate it back into space. Most nebulae glow red, the color of hydrogen gas. The brightest nebula is the Orion Nebula (see slide #60) which can be seen with the unaided eye in a dark sky. Nebulae are very important in astronomy because they are the key to ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.