ASTRO-114--Lecture 47-
... above the Earth’s atmosphere, it would look almost white. But at the bottom of the atmosphere when we look at it, it looks more yellow. And the reason is that some of the blue has been removed from the sunlight and that blue has been scattered around by the molecules in the atmosphere. And so when y ...
... above the Earth’s atmosphere, it would look almost white. But at the bottom of the atmosphere when we look at it, it looks more yellow. And the reason is that some of the blue has been removed from the sunlight and that blue has been scattered around by the molecules in the atmosphere. And so when y ...
20_Testbank
... 3) List at least three qualities that would tend to make a type of astronomical object useful as a standard candle. Answer: Answers will vary, but some of the key properties of good standard candles include little statistical scatter in brightness; high luminosity, so they can be seen at a great dis ...
... 3) List at least three qualities that would tend to make a type of astronomical object useful as a standard candle. Answer: Answers will vary, but some of the key properties of good standard candles include little statistical scatter in brightness; high luminosity, so they can be seen at a great dis ...
Exploring Neutral Hydrogen and Galaxy Evolution with the SKA
... Analysis of thousands of galaxies in the Sloan Digital Sky Survey (SDSS) has shown that they follow a bimodal distribution in colour as a function of stellar mass (Baldry et al. (2004)); most galaxies are either located in the so-called blue cloud or on the red sequence, indicating that star formati ...
... Analysis of thousands of galaxies in the Sloan Digital Sky Survey (SDSS) has shown that they follow a bimodal distribution in colour as a function of stellar mass (Baldry et al. (2004)); most galaxies are either located in the so-called blue cloud or on the red sequence, indicating that star formati ...
original version
... of galaxy evolution, in which mergers between dark matter haloes and/or luminous galaxies occur frequently, increasing their mass and ultimately shaping them into the galaxies that we observe at the current epoch. A frequent assumption is that interactions and mergers lead to star formation rates (S ...
... of galaxy evolution, in which mergers between dark matter haloes and/or luminous galaxies occur frequently, increasing their mass and ultimately shaping them into the galaxies that we observe at the current epoch. A frequent assumption is that interactions and mergers lead to star formation rates (S ...
Stars - Emera Astronomy Center
... c. Describe the location of our solar system in its galaxy and explain that other galaxies exist and that they include stars and planets. D3. Matter and Energy i. Use examples of energy transformations from one form to another to explain that energy cannot be created or destroyed. k. Describe the pr ...
... c. Describe the location of our solar system in its galaxy and explain that other galaxies exist and that they include stars and planets. D3. Matter and Energy i. Use examples of energy transformations from one form to another to explain that energy cannot be created or destroyed. k. Describe the pr ...
L43 THE STARFISH TWINS: TWO YOUNG
... N1 with S4, N2 with S3, and N3 with S1 is equally plausible. A comparison of the fluxes of both PNs at different wavelengths indicates that they are intrinsically similar in size and brightness but are located at different distances. We find that the stellar blue and visual (continuum) fluxes, the H ...
... N1 with S4, N2 with S3, and N3 with S1 is equally plausible. A comparison of the fluxes of both PNs at different wavelengths indicates that they are intrinsically similar in size and brightness but are located at different distances. We find that the stellar blue and visual (continuum) fluxes, the H ...
Interpretation of the Helix Planetary Nebula using Hydro
... by its big bang turbulent beginning (Gibson 2005) implies a closed contracting fate for the universe, not an open accelerating expansion driven by dark energy (Busa et al. 2007). According to HGD, SNe Ia explosions always occur in PNes within PGC massive dense clumps of frozen primordial planets whe ...
... by its big bang turbulent beginning (Gibson 2005) implies a closed contracting fate for the universe, not an open accelerating expansion driven by dark energy (Busa et al. 2007). According to HGD, SNe Ia explosions always occur in PNes within PGC massive dense clumps of frozen primordial planets whe ...
REVIEW Numerical Star-Formation Studies— A Status Report
... Santa Cruz and at Leiden Observatory. He got his Ph.D. in 1998 from Heidelberg University for his work on star cluster formation with Andreas Burkert at the Max Planck Institute for Astronomy. Ralf Klessen received the Ludwig Biermann Prize of the German Astronomical Society and the Otto Hahn Award ...
... Santa Cruz and at Leiden Observatory. He got his Ph.D. in 1998 from Heidelberg University for his work on star cluster formation with Andreas Burkert at the Max Planck Institute for Astronomy. Ralf Klessen received the Ludwig Biermann Prize of the German Astronomical Society and the Otto Hahn Award ...
Interstellar Space Not as Empty as you Might Think
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) All the heavy elements in the Earth were made in stars, then spent time in interst ...
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) All the heavy elements in the Earth were made in stars, then spent time in interst ...
Atoms and Stars IST 3360 and IST 1990
... o Celestial physics: heavens are perfect • Smooth, spherical, flawless • Natural state: moving in a circle with constant speed • Earth at center (geocentric) ...
... o Celestial physics: heavens are perfect • Smooth, spherical, flawless • Natural state: moving in a circle with constant speed • Earth at center (geocentric) ...
Interstellar Space Not as Empty as you Might Think
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) ...
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) ...
Interstellar Space
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) All the heavy elements in the Earth were made in stars, then spent time in interst ...
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) All the heavy elements in the Earth were made in stars, then spent time in interst ...
10 Astrophysics (Option E)
... gets light, and when it goes down, it gets dark. If people counted the sun-ups and sundowns, they could predict when flowers would bloom and fruit ripen, and from the position of the Moon they could calculate the tides. Since the largest objects in the sky gave such good predictions, it was a small ...
... gets light, and when it goes down, it gets dark. If people counted the sun-ups and sundowns, they could predict when flowers would bloom and fruit ripen, and from the position of the Moon they could calculate the tides. Since the largest objects in the sky gave such good predictions, it was a small ...
The coronal temperatures of low-mass main
... threshold in rotation, given that saturation happens at a single mass-independent value of RX . It would further imply that all saturated stars have similar coronal temperatures. On the other hand, if either LX or FX are the relevant parameters, then it would indicate that among stars that lie above ...
... threshold in rotation, given that saturation happens at a single mass-independent value of RX . It would further imply that all saturated stars have similar coronal temperatures. On the other hand, if either LX or FX are the relevant parameters, then it would indicate that among stars that lie above ...
Photospheric activity, rotation, and star
... drifts present in individual channels, we sum up the flux in the red, green, and blue channels to obtain a light curve in a spectral range extending from 300 to 1100 nm. The observations and data processing are described by Fridlund et al. (2010), to whom we refer the reader for details. The reducti ...
... drifts present in individual channels, we sum up the flux in the red, green, and blue channels to obtain a light curve in a spectral range extending from 300 to 1100 nm. The observations and data processing are described by Fridlund et al. (2010), to whom we refer the reader for details. The reducti ...
CO emissions from optically selected galaxies at z ∼0.1–0.2: Tight
... and M > 1010.5 M consist of the later- and earliertype galaxies, respectively (e.g., Conselice 2006); (3) massive galaxies with M > 1011 M acquired most of their stellar mass before z = 1 while less massive galaxies with M < 1010 M acquired most of their stellar mass after z = 1 (e.g., Leitner ...
... and M > 1010.5 M consist of the later- and earliertype galaxies, respectively (e.g., Conselice 2006); (3) massive galaxies with M > 1011 M acquired most of their stellar mass before z = 1 while less massive galaxies with M < 1010 M acquired most of their stellar mass after z = 1 (e.g., Leitner ...
Abundances and possible diffusion of elements in M 67 stars⋆
... solar abundances, with abundance ratios closer to solar than those of most solar twins in the solar neighbourhood. An exception is Li, which shows considerable scatter among the cluster stars. There is a tendency for the cluster-star abundances to be more depleted than the abundances in the field st ...
... solar abundances, with abundance ratios closer to solar than those of most solar twins in the solar neighbourhood. An exception is Li, which shows considerable scatter among the cluster stars. There is a tendency for the cluster-star abundances to be more depleted than the abundances in the field st ...
Low-Res Version - Chandra X
... galaxy. It was formed from a relatively recent (30 million years ago) merger of two smaller galaxies. The merger is causing stars to form, evolve, and explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the mer ...
... galaxy. It was formed from a relatively recent (30 million years ago) merger of two smaller galaxies. The merger is causing stars to form, evolve, and explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the mer ...
Neon abundances - UCL Astrophysics Group
... Explorer (IUE) on the ultraviolet resonance lines of iron-peak elements in 26 HgMn, four superficially normal and 10 normal stars. We observed definite detections or determined upper limits for Ne i in 21 of the HgMn stars in the Smith & Dworetsky (1993) sample, and in 11 of the normal and superfici ...
... Explorer (IUE) on the ultraviolet resonance lines of iron-peak elements in 26 HgMn, four superficially normal and 10 normal stars. We observed definite detections or determined upper limits for Ne i in 21 of the HgMn stars in the Smith & Dworetsky (1993) sample, and in 11 of the normal and superfici ...
Is the central binary system of the planetary nebula Henize 2
... (Prinja and Urbaneja, 2014). This structure varies on time scales down to about an hour. Prinja and Urbaneja (2014) attribute the variation in the line to a variable distribution of clumps in the wind, variations in the velocity field, and/or the mass loss rate, rather to a binary star. It could be a ...
... (Prinja and Urbaneja, 2014). This structure varies on time scales down to about an hour. Prinja and Urbaneja (2014) attribute the variation in the line to a variable distribution of clumps in the wind, variations in the velocity field, and/or the mass loss rate, rather to a binary star. It could be a ...
sections 16-18 instructor notes
... line-of-sight to the Galactic centre, the velocities, whereas stars in strictly circular orbits have no such component of their orbital motion. The correlation of asymmetric drift with the dispersion in velocities, 2, for various kinematic groups, is also predicted from quantitative arguments, ...
... line-of-sight to the Galactic centre, the velocities, whereas stars in strictly circular orbits have no such component of their orbital motion. The correlation of asymmetric drift with the dispersion in velocities, 2, for various kinematic groups, is also predicted from quantitative arguments, ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.