Stars, Galaxies, and the Universe Section 1
... rotational axis, so Polaris moves only slightly around the pole during one rotation of Earth. ...
... rotational axis, so Polaris moves only slightly around the pole during one rotation of Earth. ...
Stellar Census
... Which of these samples is more representative of the entire population of stars in our galaxy? A representative sample includes all parts of the population of the objects your are investigating in their proper proportions The relative proportion of common things will be greater than the relative pro ...
... Which of these samples is more representative of the entire population of stars in our galaxy? A representative sample includes all parts of the population of the objects your are investigating in their proper proportions The relative proportion of common things will be greater than the relative pro ...
Document
... Solar bisectors take on a „C“ shape due to more flux and more area of rising part of convective cells. There is considerable variations with limb angle due to the change of depth of formation and the view angle. The line profiles themselves become shallower and wider towards the limb. ...
... Solar bisectors take on a „C“ shape due to more flux and more area of rising part of convective cells. There is considerable variations with limb angle due to the change of depth of formation and the view angle. The line profiles themselves become shallower and wider towards the limb. ...
Ch 11a (Measuring Stars 10-28-10)
... Distance: If you know the parallax “p” (in arcseconds) you can calculate the distance “d” (in parsecs) d=1/p (1parsec= 3.26 lightyears) Apparent brightness: how bright a star looks in the sky The inverse-square Law: light from stars gets fainter as the inverse square of the distance (apparent bri ...
... Distance: If you know the parallax “p” (in arcseconds) you can calculate the distance “d” (in parsecs) d=1/p (1parsec= 3.26 lightyears) Apparent brightness: how bright a star looks in the sky The inverse-square Law: light from stars gets fainter as the inverse square of the distance (apparent bri ...
Chapter 18 - Origin and Evolution of Stars Chapter Preview
... Because stars in a star cluster are found together, they are generally believed to have been formed at roughly the same time and in the same neighborhood. In our Milky Way galaxy there are two main types of star clusters: open clusters and globular clusters (Figure 15). Open clusters are small and i ...
... Because stars in a star cluster are found together, they are generally believed to have been formed at roughly the same time and in the same neighborhood. In our Milky Way galaxy there are two main types of star clusters: open clusters and globular clusters (Figure 15). Open clusters are small and i ...
Test #4
... 1. The location of the center of the Galaxy is determined by observations of: a) Cepheids variables, b) Globular clusters, c) The spiral arms, d) A visually bright, massive, object around which all objects in the Galaxy move. 2. What two observations of an object allow for a determination of the Mil ...
... 1. The location of the center of the Galaxy is determined by observations of: a) Cepheids variables, b) Globular clusters, c) The spiral arms, d) A visually bright, massive, object around which all objects in the Galaxy move. 2. What two observations of an object allow for a determination of the Mil ...
Life Stages of High
... • Fusion progresses no further in a low-mass star because the core temperature never grows hot enough for fusion of heavier elements (some He fuses to C to make oxygen) • Degeneracy pressure supports the white dwarf ...
... • Fusion progresses no further in a low-mass star because the core temperature never grows hot enough for fusion of heavier elements (some He fuses to C to make oxygen) • Degeneracy pressure supports the white dwarf ...
Today: Magnitude Terminology Photometry Applications Reading
... Calibrated Magnitude: physically meaningful brightness of a star calibrated relative to the known flux standard (e.g. Vega); typically obtained by calculating differential magnitude w.r.t. a known standard star. ...
... Calibrated Magnitude: physically meaningful brightness of a star calibrated relative to the known flux standard (e.g. Vega); typically obtained by calculating differential magnitude w.r.t. a known standard star. ...
Document
... Magnitude Vs Intensity Intensity is related to magnitude: definition of intensity is energy/second reaching a unit area at the observer “Solar Constant” = 1500 Watts/sq. Meter--this is the amount of energy reaching the earth’s surface per ...
... Magnitude Vs Intensity Intensity is related to magnitude: definition of intensity is energy/second reaching a unit area at the observer “Solar Constant” = 1500 Watts/sq. Meter--this is the amount of energy reaching the earth’s surface per ...
Lec09_ch11_lifecycleofstars
... unstable and variable – but often in predictable ways--Cepheid variables ...
... unstable and variable – but often in predictable ways--Cepheid variables ...
– 1 – 1. Chemical Evolution 1.1.
... The exact form of these equations will depend on the specific problem to be solved, the galaxy to be modelled, etc. The basic equations are not hard to write down, and in such circumstances can best be solved numerically. If you want to follow the abundances of various elements besides H in detail, ...
... The exact form of these equations will depend on the specific problem to be solved, the galaxy to be modelled, etc. The basic equations are not hard to write down, and in such circumstances can best be solved numerically. If you want to follow the abundances of various elements besides H in detail, ...
Supernova Stalking - Susanna Kumlien Reportage
... Finding supernovae at the optimal moment, just after the explosion, means their properties can be investigated more thoroughly. What type of star gives birth to what kind of supernova? Photos taken before and after the explosion will disclose yet unseen data. The method of image subtracting is being ...
... Finding supernovae at the optimal moment, just after the explosion, means their properties can be investigated more thoroughly. What type of star gives birth to what kind of supernova? Photos taken before and after the explosion will disclose yet unseen data. The method of image subtracting is being ...
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... Self gravitating sphere (or almost sphere) of gas with a finite definable radius, not easily deformed, not like a cloud in the Earth’s atmosphere Nuclear reactions occur at least to the point where 3 He is produced. radiates energy into the surrounding medium. Jupiter also does this, some internal h ...
... Self gravitating sphere (or almost sphere) of gas with a finite definable radius, not easily deformed, not like a cloud in the Earth’s atmosphere Nuclear reactions occur at least to the point where 3 He is produced. radiates energy into the surrounding medium. Jupiter also does this, some internal h ...
The star formation histories of two northern LMC fields
... formation history is also correct for two other outer LMC fields. It has also been hinted that the star formation rates may have begun to decrease during the past Gyr. Olsen (1999) studied the HST field surrounding NGC 1754, which also lies in the northern part of the disc, as well as the fields sur ...
... formation history is also correct for two other outer LMC fields. It has also been hinted that the star formation rates may have begun to decrease during the past Gyr. Olsen (1999) studied the HST field surrounding NGC 1754, which also lies in the northern part of the disc, as well as the fields sur ...
PDF - BYU Studies
... pass away. Modern astrophysics teaches that stars are formed, enjoy an enormously long “summer” as they fuse hydrogen to helium in their core, then undergo major changes as nuclear fuel runs low, and finally fade away (occasionally with grand fireworks). The sun is enjoying its glorious summer, but ...
... pass away. Modern astrophysics teaches that stars are formed, enjoy an enormously long “summer” as they fuse hydrogen to helium in their core, then undergo major changes as nuclear fuel runs low, and finally fade away (occasionally with grand fireworks). The sun is enjoying its glorious summer, but ...
PHYS3380_110215_bw - The University of Texas at Dallas
... The Asymptotic Giant Branch The core will soon consist only of C+O, and in a similar way to before, the CO-core grows while a He-burning shell source develops. These two shell sources force expansion of the envelop and the star evolves up the red giant branch a second time - this is called the asymp ...
... The Asymptotic Giant Branch The core will soon consist only of C+O, and in a similar way to before, the CO-core grows while a He-burning shell source develops. These two shell sources force expansion of the envelop and the star evolves up the red giant branch a second time - this is called the asymp ...
Recipes for ULX formation: necessary ingredients and garnishments
... a compelling need to invoke intermediate-mass BHs in ULXs, and that the upper mass limit is likely to be somewhere between 50 and 200M . Correspondingly, if dynamical collapse and merger processes are still needed to form a very massive stellar progenitor (> 100M ), clusters as small as ∼ 104 M m ...
... a compelling need to invoke intermediate-mass BHs in ULXs, and that the upper mass limit is likely to be somewhere between 50 and 200M . Correspondingly, if dynamical collapse and merger processes are still needed to form a very massive stellar progenitor (> 100M ), clusters as small as ∼ 104 M m ...
Slide 1
... As the electrons overlap, they merge with the protons to turn into neutrons. The neutrons all crush together, at which point their neutron pressure is enough to stop the collapse from gravity. ...
... As the electrons overlap, they merge with the protons to turn into neutrons. The neutrons all crush together, at which point their neutron pressure is enough to stop the collapse from gravity. ...
Structure of the solar system
... Earth (A), its lines will be blue-shifted. As they two stars are moving horizontally with respect to the Earth, the spectral lines are normal. Then B moves towards Earth and A moves away. The spectral lines move apart then come together twice per revolution. See the simplified animation ...
... Earth (A), its lines will be blue-shifted. As they two stars are moving horizontally with respect to the Earth, the spectral lines are normal. Then B moves towards Earth and A moves away. The spectral lines move apart then come together twice per revolution. See the simplified animation ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.