P - Inaf
... (our final sample consists of 11 296 centrals and 7053 satellites), at least the final sample of model galaxies is biased in a similar way as the real data, thus allowing for a more meaningful comparison.2 Fig. 6 shows the average metallicity and mass-weighted stellar ages of the W08 model galaxies ...
... (our final sample consists of 11 296 centrals and 7053 satellites), at least the final sample of model galaxies is biased in a similar way as the real data, thus allowing for a more meaningful comparison.2 Fig. 6 shows the average metallicity and mass-weighted stellar ages of the W08 model galaxies ...
AST1100 Lecture Notes
... limited usefulness until better detection methods are discovered. 4. gravitational waves: spacetime distortions traveling through space as a wave. These are predicted by Einstein’s general theory of relativity. Gravitational waves have still not been directly detected, but experiments are on their w ...
... limited usefulness until better detection methods are discovered. 4. gravitational waves: spacetime distortions traveling through space as a wave. These are predicted by Einstein’s general theory of relativity. Gravitational waves have still not been directly detected, but experiments are on their w ...
instructor notes stellar evolution, star clusters
... Another method of determining distances to late-type stars is by means of the Wilson-Bappu effect, namely that the width of the central emission component of the Ca II K line in G and K-type stars is directly related to the absolute magnitude of the star — the broader the emission line width, denot ...
... Another method of determining distances to late-type stars is by means of the Wilson-Bappu effect, namely that the width of the central emission component of the Ca II K line in G and K-type stars is directly related to the absolute magnitude of the star — the broader the emission line width, denot ...
instructor notes stellar evolution, star clusters
... Another method of determining distances to late-type stars is by means of the Wilson-Bappu effect, namely that the width of the central emission component of the Ca II K line in G and K-type stars is directly related to the absolute magnitude of the star — the broader the emission line width, denot ...
... Another method of determining distances to late-type stars is by means of the Wilson-Bappu effect, namely that the width of the central emission component of the Ca II K line in G and K-type stars is directly related to the absolute magnitude of the star — the broader the emission line width, denot ...
UNIT 4 - Galaxies XIV. The Milky Way A. Structure
... Interstellar gas and dust prevent observations of stars to great distances within the galaxy radio telescopes (long wavelengths) can "see" through the dust and allow astronomers to map the distribution of gas and dust in the galaxy - Milky Way has a spiral structure Spiral arms contain gas and dust ...
... Interstellar gas and dust prevent observations of stars to great distances within the galaxy radio telescopes (long wavelengths) can "see" through the dust and allow astronomers to map the distribution of gas and dust in the galaxy - Milky Way has a spiral structure Spiral arms contain gas and dust ...
GRB jets and their interaction with the progenitor star
... 10o and =10 is propagated through polytropic stars of varying mass and radius. The break-out time depends very mildly on the mass, so too the energy deposited into the star ...
... 10o and =10 is propagated through polytropic stars of varying mass and radius. The break-out time depends very mildly on the mass, so too the energy deposited into the star ...
The formation of the Solar System
... The ages of both these types can be measured, with surprising results. The parent bodies of meteorites began to form very soon after the formation of primitive grains: within 1 million years. Differentiated meteorites have ages which are only 10 million years younger than the oldest ...
... The ages of both these types can be measured, with surprising results. The parent bodies of meteorites began to form very soon after the formation of primitive grains: within 1 million years. Differentiated meteorites have ages which are only 10 million years younger than the oldest ...
Testing
... Lower-mass stars return gas to interstellar space through stellar winds and planetary nebulae. ...
... Lower-mass stars return gas to interstellar space through stellar winds and planetary nebulae. ...
Rocky planetesimals as the origin of metals in DZ stars
... obvious pattern is seen, although there may be a higher density of DZA stars near the Galactic disc and perhaps also towards more modest speeds, but the former may be an observational bias due to diminished spectroscopic sensitivity. In any case, one should expect a correlation between these quantit ...
... obvious pattern is seen, although there may be a higher density of DZA stars near the Galactic disc and perhaps also towards more modest speeds, but the former may be an observational bias due to diminished spectroscopic sensitivity. In any case, one should expect a correlation between these quantit ...
Curiosities of the Sky
... openings in the sky, for as one continues to gaze it loses its purely metaphysical quality and becomes a kind of entity, like the ocean. The observer is conscious that he can actually see the beginning of its ebon depths, in which the visible universe appears to float like an enchanted island, respl ...
... openings in the sky, for as one continues to gaze it loses its purely metaphysical quality and becomes a kind of entity, like the ocean. The observer is conscious that he can actually see the beginning of its ebon depths, in which the visible universe appears to float like an enchanted island, respl ...
The age structure of the Milky Way`s halo
... number-density contrast. Known over-densities and streams are identified by labels on the maps shown in Fig. 1; locations of these are listed in Table 1 of the Supplemental Material. Many of the recognized structures are members of the northern (leading/trailing) or southern (leading/trailing) arm ...
... number-density contrast. Known over-densities and streams are identified by labels on the maps shown in Fig. 1; locations of these are listed in Table 1 of the Supplemental Material. Many of the recognized structures are members of the northern (leading/trailing) or southern (leading/trailing) arm ...
New layout
... with extensive book and video collection, astronomical viewing deck, ten rental telescopes from 7-24, outdoor gas grill, meadow and mountain hiking trails, mountain meadow labyrinth and meditation garden. There are powered piers for your own scope and the 24 is an impressive Ritchey-Chretien origi ...
... with extensive book and video collection, astronomical viewing deck, ten rental telescopes from 7-24, outdoor gas grill, meadow and mountain hiking trails, mountain meadow labyrinth and meditation garden. There are powered piers for your own scope and the 24 is an impressive Ritchey-Chretien origi ...
Analemma - Stony Brook University
... • Perseus, Andromeda, Pegasus, Cetus, Cepheus, and Cassiopeia are all to be found in the fall evening sky. • Perseus holds the head of Medusa (the variable star Algol - the Ghoul - is her eye). • As punishment for her vanity, Queen Cassiopeia, as a circumpolar constellation, is condemned to hang ups ...
... • Perseus, Andromeda, Pegasus, Cetus, Cepheus, and Cassiopeia are all to be found in the fall evening sky. • Perseus holds the head of Medusa (the variable star Algol - the Ghoul - is her eye). • As punishment for her vanity, Queen Cassiopeia, as a circumpolar constellation, is condemned to hang ups ...
L53 He I 1.083 mm EMISSION AND ABSORPTION IN DG TAURI
... coincide with a high-velocity component of the [Fe ii] 1.257 mm emission, which arises from a jet within an arcsecond of the star. The presence of such a high-excitation line (with an excitation energy of ∼20 eV) within the jet supports the scenario of shock heating. The bright He i component does n ...
... coincide with a high-velocity component of the [Fe ii] 1.257 mm emission, which arises from a jet within an arcsecond of the star. The presence of such a high-excitation line (with an excitation energy of ∼20 eV) within the jet supports the scenario of shock heating. The bright He i component does n ...
Neutron stars as probes of extreme energy density matter
... 2GM = c2 R in the characteristic mass M vs. characteristic distance R diagram of the objects in our Universe (G is the Newton’s gravitational constant and c is the speed of light) [1]. Observed neutron star masses lie in the range 1−2M , whereas their radii are about 10−15 km so that GM/c2 R ∼ 0.1− ...
... 2GM = c2 R in the characteristic mass M vs. characteristic distance R diagram of the objects in our Universe (G is the Newton’s gravitational constant and c is the speed of light) [1]. Observed neutron star masses lie in the range 1−2M , whereas their radii are about 10−15 km so that GM/c2 R ∼ 0.1− ...
Semin2012.2 - Institute of Astronomy
... OPTICON gives possibility of the Bulgarian astronomers to use the ESO facilities !!! ...
... OPTICON gives possibility of the Bulgarian astronomers to use the ESO facilities !!! ...
From planetesimals to planetary systems: a hardles race
... Single size particles in the simulations (small particles may contribute significantly to the the growth of larger bodies). Each particle is representative of many particles (pre-clumping?) Drag is computed from nodes around the particle and back reaction acts on the nodes. What is the effect ...
... Single size particles in the simulations (small particles may contribute significantly to the the growth of larger bodies). Each particle is representative of many particles (pre-clumping?) Drag is computed from nodes around the particle and back reaction acts on the nodes. What is the effect ...
Stellivore Extraterrestrials? Binary Stars as Living Systems
... have to evolve from type KI to type KII and harness the energy of the Sun? There are essentially two reasons. First, simply to meet our growing energy consumption needs. Indeed, the Sun is the obvious long-term resource to harness energy from, because it contains 99.8% of our solar system's mass-ene ...
... have to evolve from type KI to type KII and harness the energy of the Sun? There are essentially two reasons. First, simply to meet our growing energy consumption needs. Indeed, the Sun is the obvious long-term resource to harness energy from, because it contains 99.8% of our solar system's mass-ene ...
Low-Res Version - Chandra X
... explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the merged galaxy contains an extraordinary feature: there are two bright nuclei. Chandra was able to clearly distinguish the two nuclei, and to measure the d ...
... explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the merged galaxy contains an extraordinary feature: there are two bright nuclei. Chandra was able to clearly distinguish the two nuclei, and to measure the d ...
Project 9: Stellar Spectra: Temperature
... Hydrogen dominates the Sun, yet absorption lines of ionized calcium dominate the solar spectrum even though there is 440,000 times as much hydrogen as calcium. Hydrogen has a low efficiency of absorption, whereas that of ionized calcium is very high. The efficiency depend ...
... Hydrogen dominates the Sun, yet absorption lines of ionized calcium dominate the solar spectrum even though there is 440,000 times as much hydrogen as calcium. Hydrogen has a low efficiency of absorption, whereas that of ionized calcium is very high. The efficiency depend ...
The Hipparcos Star Globe Booklet - Cosmos
... rotation so that over time the telescope could repeatedly scan the entire celestial sphere. A simultaneous onboard experiment named Tycho was also to provide astrometric and two-colour photometric information for one million stars with lesser but still unprecedented accuracy. The complex task of ana ...
... rotation so that over time the telescope could repeatedly scan the entire celestial sphere. A simultaneous onboard experiment named Tycho was also to provide astrometric and two-colour photometric information for one million stars with lesser but still unprecedented accuracy. The complex task of ana ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.