When Stars Attack! In Search of Killer Supernovae
... In hot core: fusion Light elements combine hydrogen ...
... In hot core: fusion Light elements combine hydrogen ...
CBO_Paper2_UnderstandingtheStoryOfTheUniverse
... understand the properties of the Universe. This paper will explain when scientists realized that the Universe was much more complicated than they initially thought as well as their struggle to determine the history of the Universe with a special emphasis on dark matter. Galaxies Beginning in the ear ...
... understand the properties of the Universe. This paper will explain when scientists realized that the Universe was much more complicated than they initially thought as well as their struggle to determine the history of the Universe with a special emphasis on dark matter. Galaxies Beginning in the ear ...
The 2dF QSO Redshift Survey
... Croom et al. 2002, MNRAS, 322, L29 Croom et al. 2004, MNRAS, 349, 1397 ...
... Croom et al. 2002, MNRAS, 322, L29 Croom et al. 2004, MNRAS, 349, 1397 ...
Parallax
... then were improving by Tycho Brahe, who became the world's best pre-telescope observer, measuring the positions of planets at least ten times more accurately than ever before. ...
... then were improving by Tycho Brahe, who became the world's best pre-telescope observer, measuring the positions of planets at least ten times more accurately than ever before. ...
Homework #3, AST 1002
... (b) It takes about five minutes for energy from the Sun's core to reach its surface. (c) The proton cycle describes the process of energy production in the Sun's core. The correct answer(s) is(are) ____________. 5. Which of the following is (are) necessary when determining the distance to a star usi ...
... (b) It takes about five minutes for energy from the Sun's core to reach its surface. (c) The proton cycle describes the process of energy production in the Sun's core. The correct answer(s) is(are) ____________. 5. Which of the following is (are) necessary when determining the distance to a star usi ...
REVIEWS The formation of the first stars and galaxies Volker Bromm
... first sources of light and chemical elements beyond the primordial hydrogen and helium produced in the Big Bang. The interplay of theory and upcoming observations promises to answer the key open questions in this emerging field. he formation of the first stars and galaxies at the end of the cosmic ‘ ...
... first sources of light and chemical elements beyond the primordial hydrogen and helium produced in the Big Bang. The interplay of theory and upcoming observations promises to answer the key open questions in this emerging field. he formation of the first stars and galaxies at the end of the cosmic ‘ ...
Gaia - ESA`s Galactic Census
... To understand the physics of a star fully, its distance from Earth must be known. This is more difficult than it sounds because stars are so remote. Even the closest one is 40 trillion kilometres away, and thus we cannot presently send spacecraft to them to measure as they go. Nor can we bounce rada ...
... To understand the physics of a star fully, its distance from Earth must be known. This is more difficult than it sounds because stars are so remote. Even the closest one is 40 trillion kilometres away, and thus we cannot presently send spacecraft to them to measure as they go. Nor can we bounce rada ...
Gaia - ESA`s Galactic Census
... To understand the physics of a star fully, its distance from Earth must be known. This is more difficult than it sounds because stars are so remote. Even the closest one is 40 trillion kilometres away, and thus we cannot presently send spacecraft to them to measure as they go. Nor can we bounce rada ...
... To understand the physics of a star fully, its distance from Earth must be known. This is more difficult than it sounds because stars are so remote. Even the closest one is 40 trillion kilometres away, and thus we cannot presently send spacecraft to them to measure as they go. Nor can we bounce rada ...
Article PDF - IOPscience
... performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are required before running the photometry procedure. First, image defects such as bad columns and saturated pixels are ide ...
... performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are required before running the photometry procedure. First, image defects such as bad columns and saturated pixels are ide ...
Red supergiants around the obscured open cluster Stephenson 2
... Context. Several clusters of red supergiants have been discovered in a small region of the Milky Way close to the base of the ScutumCrux Arm and the tip of the Long Bar. Population synthesis models indicate that they must be very massive to harbour so many supergiants. Amongst these clusters, Stephe ...
... Context. Several clusters of red supergiants have been discovered in a small region of the Milky Way close to the base of the ScutumCrux Arm and the tip of the Long Bar. Population synthesis models indicate that they must be very massive to harbour so many supergiants. Amongst these clusters, Stephe ...
Parameters of massive stars in the Milky Way and nearby galaxies
... evolution of these stars. This, on the other hand, is very model dependent. A simple example may be given by the energy emitted by a starburst region. Assuming that this is the energy emitted by the recently formed stars, the derived IMF will depend on the prediction of the stellar emergent fluxes f ...
... evolution of these stars. This, on the other hand, is very model dependent. A simple example may be given by the energy emitted by a starburst region. Assuming that this is the energy emitted by the recently formed stars, the derived IMF will depend on the prediction of the stellar emergent fluxes f ...
Nebulae.The Lagoon and Dumbbell Nebulae
... The star is hot and blue with temperature of 85000K (Most of these stars usually turn into red giants. They lose their mass by ejection of the outer gas layers. These layers expand in space, forming a temporary wrap around the star.). M27 Dumbbell is found by Charles Messier on the 12 of July 1764. ...
... The star is hot and blue with temperature of 85000K (Most of these stars usually turn into red giants. They lose their mass by ejection of the outer gas layers. These layers expand in space, forming a temporary wrap around the star.). M27 Dumbbell is found by Charles Messier on the 12 of July 1764. ...
doc - StealthSkater
... 2. A much stronger assumption is that the star eventually rotates with the same velocity as the distant stars of Milky Way around its center after the ripping out. If the dark matter is also rotating as it should be and forms a halo, the gravitational interactions with it could force the hydrodynami ...
... 2. A much stronger assumption is that the star eventually rotates with the same velocity as the distant stars of Milky Way around its center after the ripping out. If the dark matter is also rotating as it should be and forms a halo, the gravitational interactions with it could force the hydrodynami ...
Star Cluster Trivia!
... They are extremely dense! At the centers of clusters, stars are sometimes as close together as Pluto is to the Sun! Because of high density, stars interact with each other! - Stars can collide - Complicated binary interactions help create cool binary sources, like X-ray binaries ...
... They are extremely dense! At the centers of clusters, stars are sometimes as close together as Pluto is to the Sun! Because of high density, stars interact with each other! - Stars can collide - Complicated binary interactions help create cool binary sources, like X-ray binaries ...
How to measure seeing
... Astronomy is scientific field which deals with all objects beyond Earth's atmosphere. We can divide astronomical observing into daily and night observing. The daily observing is limited by the brightness of the Sun. The Sun is the most sought after object for the daily observing. It is necessary to ...
... Astronomy is scientific field which deals with all objects beyond Earth's atmosphere. We can divide astronomical observing into daily and night observing. The daily observing is limited by the brightness of the Sun. The Sun is the most sought after object for the daily observing. It is necessary to ...
–1– 28. HIGH-MASS STAR FORMATION: THEORY 28.1. The Effects
... s−1 considered by Keto, this restricts the accretion rate to ṁ∗ . 3 × 10−5 M¯ yr−1 , smaller than the values he considers. (One can show that when one generalizes the Bondi accretion model to approximately include the self gravity of the gas, the accretion rate is indeed about c 3 /G.) Bonnell and ...
... s−1 considered by Keto, this restricts the accretion rate to ṁ∗ . 3 × 10−5 M¯ yr−1 , smaller than the values he considers. (One can show that when one generalizes the Bondi accretion model to approximately include the self gravity of the gas, the accretion rate is indeed about c 3 /G.) Bonnell and ...
Present classification: Suggested
... ~EA, EB, ~EW, eclipsing (more marginal cases), Cepheids, Cepheids (with more marginal cases), LPVs, RR Lyrae candidates, various case class, small amplitude variables, SARVs, SRs, Miras. The authors estimate the type classification error level to be about 7 percent. In my opinion, first, this level ...
... ~EA, EB, ~EW, eclipsing (more marginal cases), Cepheids, Cepheids (with more marginal cases), LPVs, RR Lyrae candidates, various case class, small amplitude variables, SARVs, SRs, Miras. The authors estimate the type classification error level to be about 7 percent. In my opinion, first, this level ...
Document
... Other spiral galaxies are also shown (see figures) for comparison and to show something of what our Galaxy must look like when seen from high above it. ...
... Other spiral galaxies are also shown (see figures) for comparison and to show something of what our Galaxy must look like when seen from high above it. ...
Astronomy 10 Measuring Stars
... The sun has a temperature of about 6000K. Given the data you have calculated so far, what is the ratio of the radius of Sirius A to that of the sun? ...
... The sun has a temperature of about 6000K. Given the data you have calculated so far, what is the ratio of the radius of Sirius A to that of the sun? ...
the stebbins galaxy: the origins of interstellar medium studies
... from such neighboring objects as the Andromeda Nebula, as it was then called. The structure, composition, and dynamics of a unique ‗super-galaxy‘ as set out by Shapley would be very different from the throng of negligible wisps —the spiral nebulae and globular clusters— swarming about it. General ac ...
... from such neighboring objects as the Andromeda Nebula, as it was then called. The structure, composition, and dynamics of a unique ‗super-galaxy‘ as set out by Shapley would be very different from the throng of negligible wisps —the spiral nebulae and globular clusters— swarming about it. General ac ...
Galaxies - WordPress.com
... A galaxies occasionally collide with one another, particularly within cluster of galaxies B galaxies are so closely packed in the universe that they are always interacting with one another C galaxies are so widely separated that they never interact or collide D the universe is composed of one giant ...
... A galaxies occasionally collide with one another, particularly within cluster of galaxies B galaxies are so closely packed in the universe that they are always interacting with one another C galaxies are so widely separated that they never interact or collide D the universe is composed of one giant ...
A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds. III
... For many years, our knowledge of the Wolf-Rayet (WR) population of the Magellanic Clouds (MCs) was considered essentially complete: twelve WRs were known in the SMC (Massey et al. 2003) and 134 were known in the LMC (Breysacher et al. 1999). These stars had been found by a combination of general obj ...
... For many years, our knowledge of the Wolf-Rayet (WR) population of the Magellanic Clouds (MCs) was considered essentially complete: twelve WRs were known in the SMC (Massey et al. 2003) and 134 were known in the LMC (Breysacher et al. 1999). These stars had been found by a combination of general obj ...
Discovery of a bright quasar without a massive
... cases considered in the previous paragraph. Our upper limit is between 6 and 12 times fainter than the expected value, depending on the assumed stellar age. In the most conservative case (i.e. a smooth spheroidal distribution of old stars), the deviation from the average relation is 3.7 σ, which is ...
... cases considered in the previous paragraph. Our upper limit is between 6 and 12 times fainter than the expected value, depending on the assumed stellar age. In the most conservative case (i.e. a smooth spheroidal distribution of old stars), the deviation from the average relation is 3.7 σ, which is ...
17 April 2013 When Galaxies Collide Professor Carolin Crawford
... The bulge is a yellowy-white colour, revealing that it is an accumulation of older stars, similar to the population found in an elliptical galaxy. The spiral arms within the disc are notably much bluer, as they trace regions where massive star formation is currently active (blue stars are short-liv ...
... The bulge is a yellowy-white colour, revealing that it is an accumulation of older stars, similar to the population found in an elliptical galaxy. The spiral arms within the disc are notably much bluer, as they trace regions where massive star formation is currently active (blue stars are short-liv ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.