Flow-Driven Formation of Molecular Clouds
... If all the molecular gas in the Galaxy collapsed on its free-fall time, the star formation rate would be ~20 times higher than observed. Traditional solution: Molecular clouds supported against collapse for many free-fall times by turbulence and/or magnetic fields. Star formation: slow equilibrium p ...
... If all the molecular gas in the Galaxy collapsed on its free-fall time, the star formation rate would be ~20 times higher than observed. Traditional solution: Molecular clouds supported against collapse for many free-fall times by turbulence and/or magnetic fields. Star formation: slow equilibrium p ...
The self-enrichment of galactic halo globular clusters: a clue to their
... According to the scenario suggested by Jehin et al. (1998, 1999), GCs may have undergone a Type II supernovae phase in their early history. This scenario appears therefore to be linked with the self-enrichment model developed by Brown et al. within the context of the Fall and Rees theory. Following ...
... According to the scenario suggested by Jehin et al. (1998, 1999), GCs may have undergone a Type II supernovae phase in their early history. This scenario appears therefore to be linked with the self-enrichment model developed by Brown et al. within the context of the Fall and Rees theory. Following ...
Hubble Space Telescope Imaging of Post
... and/or supernova feedback. Observationally, post-starburst galaxies have been linked to mergers and AGN (e.g., Brown et al. 2009; Falkenberg et al. 2009; Wild et al. 2009, and references therein). The environments and morphologies of post-starburst galaxies are heterogeneous, which is suggestive of ...
... and/or supernova feedback. Observationally, post-starburst galaxies have been linked to mergers and AGN (e.g., Brown et al. 2009; Falkenberg et al. 2009; Wild et al. 2009, and references therein). The environments and morphologies of post-starburst galaxies are heterogeneous, which is suggestive of ...
Classification of Variable Stars
... Bluish Blue-white White Yellow-white Yellowish Orange Reddish Red-infrared infrared infrared infrared ...
... Bluish Blue-white White Yellow-white Yellowish Orange Reddish Red-infrared infrared infrared infrared ...
GALEX and Star Formation
... massive stars, hot, luminous, and short-lived, are the unambiguous tracers of star formation. They are luminous enough that they can be seen in distant galaxies. They evolve on fast timescales (.10 Myrs for Otype stars), therefore they also trace the original spatial structure of the star-formation ...
... massive stars, hot, luminous, and short-lived, are the unambiguous tracers of star formation. They are luminous enough that they can be seen in distant galaxies. They evolve on fast timescales (.10 Myrs for Otype stars), therefore they also trace the original spatial structure of the star-formation ...
PDF - ASSA
... the brightest in the sky with so little known about it, is ripe for study. That the two stars are truly connected is unquestioned as they have been tracking each other at their current separation for nearly 200 years. They must be at least 1 900 astronomical units apart, and given that they are each ...
... the brightest in the sky with so little known about it, is ripe for study. That the two stars are truly connected is unquestioned as they have been tracking each other at their current separation for nearly 200 years. They must be at least 1 900 astronomical units apart, and given that they are each ...
Goal: To understand clusters of stars
... Distance to cluster A key step in finding distances to other galaxies. How stars evolve How clusters evolve How our galaxy evolves How the composition of our galaxy changes with ...
... Distance to cluster A key step in finding distances to other galaxies. How stars evolve How clusters evolve How our galaxy evolves How the composition of our galaxy changes with ...
March 2002 Vol - European Journal of Science and Theology
... Chartres cathedral, and they do not depend on the astronomical epoch; in other words, they depend only on the cathedral itself and they have remained invariant throughout the 800 years since the epoch J1200, close to the period when Chartres cathedral was built (Figure 4). Nevertheless, an unavoidab ...
... Chartres cathedral, and they do not depend on the astronomical epoch; in other words, they depend only on the cathedral itself and they have remained invariant throughout the 800 years since the epoch J1200, close to the period when Chartres cathedral was built (Figure 4). Nevertheless, an unavoidab ...
Goal: To understand clusters of stars
... Distance to cluster A key step in finding distances to other galaxies. How stars evolve How clusters evolve How our galaxy evolves How the composition of our galaxy changes with ...
... Distance to cluster A key step in finding distances to other galaxies. How stars evolve How clusters evolve How our galaxy evolves How the composition of our galaxy changes with ...
In This Issue The most volcanically active place is out-of- this
... Jupiter and the outer Jovian moons. On Earth, the gravity from the Sun and Moon causes the ocean tides to raise-and-lower by one-to-two meters, on average, far too small to cause any heating. Io has no oceans, yet the tidal forces acting on it cause the world itself to stretch and bend by an astonis ...
... Jupiter and the outer Jovian moons. On Earth, the gravity from the Sun and Moon causes the ocean tides to raise-and-lower by one-to-two meters, on average, far too small to cause any heating. Io has no oceans, yet the tidal forces acting on it cause the world itself to stretch and bend by an astonis ...
astro-ph/0303282 PDF
... The IRAS satellite discovered that a significant population of nearby main sequence stars, including Vega, display strong excess far-infrared emission, now known to be due to circumstellar dust (Zuckerman 2001 and references therein.) The region containing the dust at these “Vega-like” stars is anal ...
... The IRAS satellite discovered that a significant population of nearby main sequence stars, including Vega, display strong excess far-infrared emission, now known to be due to circumstellar dust (Zuckerman 2001 and references therein.) The region containing the dust at these “Vega-like” stars is anal ...
5 Report of the Panel on Stars and Stellar Evolution
... How Do Rotation and Magnetic Fields Affect Stars? There’s an old chestnut about a dozing theorist at the weekly colloquium who opens his eyes at the end of every talk and rouses himself to ask, to great approbation for his subliminal understanding, “Yes, all very interesting, but what about rotatio ...
... How Do Rotation and Magnetic Fields Affect Stars? There’s an old chestnut about a dozing theorist at the weekly colloquium who opens his eyes at the end of every talk and rouses himself to ask, to great approbation for his subliminal understanding, “Yes, all very interesting, but what about rotatio ...
Notes on Stars
... Spectra of stars contain a wealth of detailed information about the properties of stars. Surface temperatures, masses, radii, luminosities, chemical compositions etc can be derived from the analysis of stellar spectra. Some historical milestones: Wollaston was probably the first who reported a few d ...
... Spectra of stars contain a wealth of detailed information about the properties of stars. Surface temperatures, masses, radii, luminosities, chemical compositions etc can be derived from the analysis of stellar spectra. Some historical milestones: Wollaston was probably the first who reported a few d ...
Lives of Stars - McDonald Observatory
... layers! The core collapsed further, with little to support it against its weight. Since it was so small and massive, the gravitational force was incredibly strong. PAGE: So, the core and shells must have been even hotter this time? SOL: Yes, it’s amazing how the core changes in such short time. But ...
... layers! The core collapsed further, with little to support it against its weight. Since it was so small and massive, the gravitational force was incredibly strong. PAGE: So, the core and shells must have been even hotter this time? SOL: Yes, it’s amazing how the core changes in such short time. But ...
PDF format
... d) No, the constellations are upside down so they appear different but they are actually the same. e) This might be true if the visit occurred in the winter when different constellations are visible than in the summer. © 2014 Pearson Education, Inc. ...
... d) No, the constellations are upside down so they appear different but they are actually the same. e) This might be true if the visit occurred in the winter when different constellations are visible than in the summer. © 2014 Pearson Education, Inc. ...
Betelgeuse - TeacherWeb
... • In 1995 the Hubble’s telescope discovered Betelgeuse. It has been noticed before but never named. In 1836 Sir John Frederick William Hersche noticed that Betelgeuse had changed in brightness. ...
... • In 1995 the Hubble’s telescope discovered Betelgeuse. It has been noticed before but never named. In 1836 Sir John Frederick William Hersche noticed that Betelgeuse had changed in brightness. ...
Kings Dethroned - The Flat Earth Society
... covery which convinced him that the sun was very much nearer to the earth than was generally supposed. The fact he had discovered was demonstrated beyond all doubt, so that he was compelled to believe that— however improbable it might seem— astronomers had made a mistake when they estimated the dist ...
... covery which convinced him that the sun was very much nearer to the earth than was generally supposed. The fact he had discovered was demonstrated beyond all doubt, so that he was compelled to believe that— however improbable it might seem— astronomers had made a mistake when they estimated the dist ...
Constraints on Long-Period Planets from an L
... stars are rare, the median distance to stars in each of these surveys has been more than 20 pc. In contrast to those above, our survey concentrates on very nearby F, G, and K stars, with proximity prioritized more than youth in the sample selection. The median distance to our survey targets is only ...
... stars are rare, the median distance to stars in each of these surveys has been more than 20 pc. In contrast to those above, our survey concentrates on very nearby F, G, and K stars, with proximity prioritized more than youth in the sample selection. The median distance to our survey targets is only ...
structure and evolution of white dwarfs and their
... winning work has been extended by subsequent developments, the basic ...
... winning work has been extended by subsequent developments, the basic ...
The Milky Way thin disk structure as revealed by stars and young
... when seen face-off, possess dusty and gaseous disks where stars are barely visible. On the other hand, when seen face-on, they exhibit quite spectacular structures in the form of gaseous and stellar spiral arms, bridges, inter-arm structures, knots, bifurcations, and so forth. These detailed shapes a ...
... when seen face-off, possess dusty and gaseous disks where stars are barely visible. On the other hand, when seen face-on, they exhibit quite spectacular structures in the form of gaseous and stellar spiral arms, bridges, inter-arm structures, knots, bifurcations, and so forth. These detailed shapes a ...
Magnetic fields in O-, B- and A-type stars on the main sequence
... An explanation of the observed fields of Ap stars already proposed a long time ago is the fossil origin. The fossil origin suggests that magnetic fields reside inside the star without being continuously renewed. Therefore, these fields have been formed during an early phase of the life of the star. The ...
... An explanation of the observed fields of Ap stars already proposed a long time ago is the fossil origin. The fossil origin suggests that magnetic fields reside inside the star without being continuously renewed. Therefore, these fields have been formed during an early phase of the life of the star. The ...
Static, Infinite, Etern and Auto sustentable Universe
... This mechanical and fragmentary vision of the Universe would remain for approximately two centuries, until Einstein (1917) proposed its own gravitational theory in his General Theory of Relativity. In the Einstein‟s vision of the Universe, the space, time and matter are constituent not separated, bu ...
... This mechanical and fragmentary vision of the Universe would remain for approximately two centuries, until Einstein (1917) proposed its own gravitational theory in his General Theory of Relativity. In the Einstein‟s vision of the Universe, the space, time and matter are constituent not separated, bu ...
Project 5: Globular cluster
... by gravity. Globular clusters orbit around the Milky Way galaxy core like satellites. The number of stars in a globular cluster varies from a few thousand up to a million stars for the more massive ones. There are ~150 known globular clusters that orbit our own Milky Way galaxy cor ...
... by gravity. Globular clusters orbit around the Milky Way galaxy core like satellites. The number of stars in a globular cluster varies from a few thousand up to a million stars for the more massive ones. There are ~150 known globular clusters that orbit our own Milky Way galaxy cor ...
Document
... the idea that time is restricted to a single dimension of spacetime. We introduce the novel idea that time is properly modeled as a geometric object. In addition to the trivial directionality associated with past and future, time is associated with relative geometric directionality associated with m ...
... the idea that time is restricted to a single dimension of spacetime. We introduce the novel idea that time is properly modeled as a geometric object. In addition to the trivial directionality associated with past and future, time is associated with relative geometric directionality associated with m ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.