Li-cai Deng
... The plots above show the largest linear extent of the spot size containing 80% of the light, as a function of declination. Above declination of 60°, the field of view has been reduced from 5 degrees to 3 degrees in diameter, which is the reason for the apparent sudden reduction in spot size. The spo ...
... The plots above show the largest linear extent of the spot size containing 80% of the light, as a function of declination. Above declination of 60°, the field of view has been reduced from 5 degrees to 3 degrees in diameter, which is the reason for the apparent sudden reduction in spot size. The spo ...
Astronomical Filters on Skynet Telescopes
... temperature of the star and amount of dust differently, which can be separated by using three or more filters as opposed to just two filters. Similarly, the chemical composition of a star affects how it shines, a feature that can also be measured with colors. With four or more filters, we can measur ...
... temperature of the star and amount of dust differently, which can be separated by using three or more filters as opposed to just two filters. Similarly, the chemical composition of a star affects how it shines, a feature that can also be measured with colors. With four or more filters, we can measur ...
Absolute magnitude of type Ia supernovae
... Research on the Relation between Type Ia Supernova’s Brightness and Galaxy’s Distance 1 Supernovae are violent phenomena in which runaway of thermonuclear fusion causes whole star’s explosion. In spite of calling a supernova as “a new star”, this phenomenon occurs at the last stage of a star’s evolu ...
... Research on the Relation between Type Ia Supernova’s Brightness and Galaxy’s Distance 1 Supernovae are violent phenomena in which runaway of thermonuclear fusion causes whole star’s explosion. In spite of calling a supernova as “a new star”, this phenomenon occurs at the last stage of a star’s evolu ...
Jan 2017 - Bays Mountain Park
... For our constellation this month, we will focus on a certain object in the Orion constellation. A couple of years ago, William Troxel spoke about the Orion Nebula and NGC 1981 in his January article. This time we will discuss one of my favorite objects, the Horsehead Nebula. The Horsehead Nebula is ...
... For our constellation this month, we will focus on a certain object in the Orion constellation. A couple of years ago, William Troxel spoke about the Orion Nebula and NGC 1981 in his January article. This time we will discuss one of my favorite objects, the Horsehead Nebula. The Horsehead Nebula is ...
32Brightness
... – Electrons in atoms have discrete (quantized) energy levels, leading to distinct colors that they can emit or absorb – This leads to emission and absorption line specta • Emission from hot gases where electrons are excited to higher energy levels and spontaneously fall to lower levels, emitting lig ...
... – Electrons in atoms have discrete (quantized) energy levels, leading to distinct colors that they can emit or absorb – This leads to emission and absorption line specta • Emission from hot gases where electrons are excited to higher energy levels and spontaneously fall to lower levels, emitting lig ...
Solutions to Homework #4, AST 203, Spring 2012
... a) If the Sun had been born as a high-mass star some 4.5 billion years ago, rather than as a low-mass star, the planet Jupiter would probably have Earth-like conditions today, while the Earth would be hot like Venus. (5 points) Solution ...
... a) If the Sun had been born as a high-mass star some 4.5 billion years ago, rather than as a low-mass star, the planet Jupiter would probably have Earth-like conditions today, while the Earth would be hot like Venus. (5 points) Solution ...
Notes 6 - University of Northern Iowa
... can be used to directly test computer models of not only the evolutionary paths of stars but also stellar pulsation models. But not all stars in this phase are pulsating stars like Cepheids or RR Lyre, so that also needs to be explained. The region of instability is relatively narrow, and star will ...
... can be used to directly test computer models of not only the evolutionary paths of stars but also stellar pulsation models. But not all stars in this phase are pulsating stars like Cepheids or RR Lyre, so that also needs to be explained. The region of instability is relatively narrow, and star will ...
Slide 1
... But the solution to this is even more confusing. If we make a graph of how fast stars in the arms move compared to distance, we get line “B”. The fact that all the stars go the same speed explains why the spiral arms don’t twist up, but it doesn’t make sense. According to physics, the speeds should ...
... But the solution to this is even more confusing. If we make a graph of how fast stars in the arms move compared to distance, we get line “B”. The fact that all the stars go the same speed explains why the spiral arms don’t twist up, but it doesn’t make sense. According to physics, the speeds should ...
(BDA) Contribution To Space Weather Investigations
... BDA will be very useful for galactic and extra-galactic investigations of the southern sky not accessible to VLA. ILWS - International Living With Star ...
... BDA will be very useful for galactic and extra-galactic investigations of the southern sky not accessible to VLA. ILWS - International Living With Star ...
Devika kamath Institute of Astronomy, KU. Leuven, Belgium
... The number of stars we expect to see at any given time in the top 1 magnitude of the RGB is k = 2.77 x106 × birthrate tip-RGB Total number of stars observed in the top 1 magnitude of the RGB in the fields searched for post-RGB stars is 118927 (from SAGE) ...
... The number of stars we expect to see at any given time in the top 1 magnitude of the RGB is k = 2.77 x106 × birthrate tip-RGB Total number of stars observed in the top 1 magnitude of the RGB in the fields searched for post-RGB stars is 118927 (from SAGE) ...
PowerPoint
... • Doppler shift– toward (blue) and away (red) • Quantum mechanics– electrons can be wave-like – Electrons around nucleus have certain orbits– defines emission and absorption of each atom – When excited, atoms emit certain lines (like in class)– fingerprint or barcode of atom ...
... • Doppler shift– toward (blue) and away (red) • Quantum mechanics– electrons can be wave-like – Electrons around nucleus have certain orbits– defines emission and absorption of each atom – When excited, atoms emit certain lines (like in class)– fingerprint or barcode of atom ...
Systematics of Galaxy Properties and Scaling Relations Ay 127
... Star formation and merging formative/evolutionary history ...
... Star formation and merging formative/evolutionary history ...
life cycles of stars
... In which order will a single star of one solar mass progress through the various stages of stellar evolution? 1. Planetary nebula, main-sequence star, white dwarf, black hole 2. Proto-star, main-sequence star, planetary nebula, white dwarf 3. Proto-star, red giant, supernova, planetary nebula 4. Pr ...
... In which order will a single star of one solar mass progress through the various stages of stellar evolution? 1. Planetary nebula, main-sequence star, white dwarf, black hole 2. Proto-star, main-sequence star, planetary nebula, white dwarf 3. Proto-star, red giant, supernova, planetary nebula 4. Pr ...
Variable Star Spectroscopy 2008
... rotational) of the objects or the material that they consist of, which can be measured by the red or blue Doppler shift. Here the tiny 50A part of the Vega spectrum containing the Hydrogen alpha line (which is equivalent the resolution achieved by the Star Analyser) is expanded to the full width of ...
... rotational) of the objects or the material that they consist of, which can be measured by the red or blue Doppler shift. Here the tiny 50A part of the Vega spectrum containing the Hydrogen alpha line (which is equivalent the resolution achieved by the Star Analyser) is expanded to the full width of ...
Astrophotography Manual
... 3. Methods of using the scope effectively 3.1. Alignment of the finder scope Before alignment, the scope should be balanced so that there will be minimal stress on the observer. To alignment it, release all the clamps and slowly let the scope lie on its side. On the other side, adjust the counter we ...
... 3. Methods of using the scope effectively 3.1. Alignment of the finder scope Before alignment, the scope should be balanced so that there will be minimal stress on the observer. To alignment it, release all the clamps and slowly let the scope lie on its side. On the other side, adjust the counter we ...
Discovery of White Dwarfs—8 Oct
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
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... All other stellar masses are from binaries except for a few gravitational redshifts for white dwarfs. The problems of binaries are: we only see the orbit projected onto the sky, not the full 3D orbit, and we do not know the inclination angle, the angle that the orbital plane makes with the plane of ...
... All other stellar masses are from binaries except for a few gravitational redshifts for white dwarfs. The problems of binaries are: we only see the orbit projected onto the sky, not the full 3D orbit, and we do not know the inclination angle, the angle that the orbital plane makes with the plane of ...
Into the sub-mm
... The final presentation of the morning was by Ben Zuckerman (University of California Los Angeles) who showed the results of very deep SCUBA imaging of four nearby main sequence stars. The results for all four (Beta Pictoris, Vega, Fomalhaut and Epsilon Eridani) were all spectacular and are almost ce ...
... The final presentation of the morning was by Ben Zuckerman (University of California Los Angeles) who showed the results of very deep SCUBA imaging of four nearby main sequence stars. The results for all four (Beta Pictoris, Vega, Fomalhaut and Epsilon Eridani) were all spectacular and are almost ce ...
Stellar Evolution 1
... Life tracks for protostars Star birth similar for all stars, but massive stars pass through the stages faster ...
... Life tracks for protostars Star birth similar for all stars, but massive stars pass through the stages faster ...
A Tale of Two (Solar) Telescopes: something old, something
... More recent observations of Alpha Cen by XMMNewton: MOS1 at top and pn at bottom (0.2-2 keV). Primary star (“A”) is clearly visible in first observation, but disappears by mid-2004: behavior unprecedented for solar corona, challenging our understanding of ...
... More recent observations of Alpha Cen by XMMNewton: MOS1 at top and pn at bottom (0.2-2 keV). Primary star (“A”) is clearly visible in first observation, but disappears by mid-2004: behavior unprecedented for solar corona, challenging our understanding of ...
Testing
... Summary of Galactic Recycling • Stars make new elements by fusion. • Dying stars expel gas and new elements, producing hot bubbles (~106 K). • Hot gas cools, allowing atomic hydrogen clouds to form ...
... Summary of Galactic Recycling • Stars make new elements by fusion. • Dying stars expel gas and new elements, producing hot bubbles (~106 K). • Hot gas cools, allowing atomic hydrogen clouds to form ...
1:45 PM TuTh This is a one-quarter course on
... the Stars and Galaxies: Third Edition by Fraknoi, Morrison, and Wolff (FMW). It is reasonably modern, but far too superficial mathematically for my liking. It does give many interesting links on the web for further study though. Another book that I would recommend especially for the second half of t ...
... the Stars and Galaxies: Third Edition by Fraknoi, Morrison, and Wolff (FMW). It is reasonably modern, but far too superficial mathematically for my liking. It does give many interesting links on the web for further study though. Another book that I would recommend especially for the second half of t ...
Our Galaxy, The Milky Way
... Stellar Kinematics Near the Sun • Velocity dispersion of stars increases with their mean age: the evidence for a stochastic acceleration due to GMC and spiral arm encounters in a differentially rotating Galaxy • The shape of the velocity ellipsoid also changes: older stars rotate more slowly; the t ...
... Stellar Kinematics Near the Sun • Velocity dispersion of stars increases with their mean age: the evidence for a stochastic acceleration due to GMC and spiral arm encounters in a differentially rotating Galaxy • The shape of the velocity ellipsoid also changes: older stars rotate more slowly; the t ...
Define the following terms in the space provided
... D) Northwest, in the direction towards the U.S.A. E) The SCP cannot be seen from this location. 2) During Spring Break you and your friends plan to travel south to Cancun, Mexico for a week of sun and fun. You arrive in Cancun on a clear night. You look up at the stars and notice that they appear di ...
... D) Northwest, in the direction towards the U.S.A. E) The SCP cannot be seen from this location. 2) During Spring Break you and your friends plan to travel south to Cancun, Mexico for a week of sun and fun. You arrive in Cancun on a clear night. You look up at the stars and notice that they appear di ...
Origin of the Earth and of the Solar System
... The Sombrero Galaxy seen from the edge – showing that spiral galaxies contain lots of dust – but in very small concentrations (Source: R. Colombari). ...
... The Sombrero Galaxy seen from the edge – showing that spiral galaxies contain lots of dust – but in very small concentrations (Source: R. Colombari). ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.