Sirius - Springer
... ▶ Demonstrates the importance of Sirius to many civilisations and cultures over thousands of years ▶ Provides an intriguing, in-depth treatment of longstanding Sirius controversies, such as Red Sirius and the story of the Dogon tribe ▶ Contains the results of original historical studies, as well as ...
... ▶ Demonstrates the importance of Sirius to many civilisations and cultures over thousands of years ▶ Provides an intriguing, in-depth treatment of longstanding Sirius controversies, such as Red Sirius and the story of the Dogon tribe ▶ Contains the results of original historical studies, as well as ...
Lecture 14
... Alternative unit of distance “1 Light Year is the distance traveled by light in one year.” Relation to other units: 1 light year (ly) is equivalent to 0.31 pc 63,270 AU ...
... Alternative unit of distance “1 Light Year is the distance traveled by light in one year.” Relation to other units: 1 light year (ly) is equivalent to 0.31 pc 63,270 AU ...
Cosmology and Particle Physics
... called a Doppler shift, it is notspace itself is expanding. There is no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger t ...
... called a Doppler shift, it is notspace itself is expanding. There is no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger t ...
Stars in the night Sky - ScienceEducationatNewPaltz
... single constellation or consist of stars belonging to different constellations. The Big and Little Dippers are asterisms within the constellations of Ursa Major and Ursa Minor. The Summer Triangle and Winter Hexagon are asterisms that include stars from several constellations. Related Note: "Asteris ...
... single constellation or consist of stars belonging to different constellations. The Big and Little Dippers are asterisms within the constellations of Ursa Major and Ursa Minor. The Summer Triangle and Winter Hexagon are asterisms that include stars from several constellations. Related Note: "Asteris ...
Solar and Lunar Eclipse, the Sky,_x000b_The Milky
... The origin of the Milky Way in Myths Myths about the origin of the Milky Way were influenced by the hunter nature of the people. For example the Mansi believed that the Milky Way formed when God created a deer with six legs. Humans couldn’t catch the deer so they called upon the Forest Spirit for he ...
... The origin of the Milky Way in Myths Myths about the origin of the Milky Way were influenced by the hunter nature of the people. For example the Mansi believed that the Milky Way formed when God created a deer with six legs. Humans couldn’t catch the deer so they called upon the Forest Spirit for he ...
Vasiliki Pavlidou - Center for Particle and Gravitational Astrophysics
... nearby transient (merger between compact objects ?) GLAST detects it as a very bright transient gamma-ray source. Follow up with Cherenkov detectors - high angular resolution. LIGO detects gravitational wave emission; nature of progenitor known at high confidence A success story Low-energy m ...
... nearby transient (merger between compact objects ?) GLAST detects it as a very bright transient gamma-ray source. Follow up with Cherenkov detectors - high angular resolution. LIGO detects gravitational wave emission; nature of progenitor known at high confidence A success story Low-energy m ...
Composition and Mass Loss
... Two of the major items which can affect stellar evolution are Composition: The most important variable is Y – the helium content Mass Loss: core evolution is essentially independent of envelope evolution especially during later phases. This means that “lower” mass stars can have a “high” luminosity. ...
... Two of the major items which can affect stellar evolution are Composition: The most important variable is Y – the helium content Mass Loss: core evolution is essentially independent of envelope evolution especially during later phases. This means that “lower” mass stars can have a “high” luminosity. ...
Chapter 16
... – Black hole grows from accretion of interstellar matter – Radius of black hole increases making capture of more material easier – Eventually black hole becomes large enough to swallow entire stars – Growth of black hole is exponential until equilibrium with available materials stops growth ...
... – Black hole grows from accretion of interstellar matter – Radius of black hole increases making capture of more material easier – Eventually black hole becomes large enough to swallow entire stars – Growth of black hole is exponential until equilibrium with available materials stops growth ...
Stellar variability and microvariability II. Spot maps and modelling
... solar-like activity in late-type MS stars; For at least 40-50 solar analogues and a few hundreds F5V-M0V stars/field, we expect to obtain: • AR evolution time scales and contrast properties; • preferential longitude for AR formation (if any); • surface differential rotation (SDR); • possible short-t ...
... solar-like activity in late-type MS stars; For at least 40-50 solar analogues and a few hundreds F5V-M0V stars/field, we expect to obtain: • AR evolution time scales and contrast properties; • preferential longitude for AR formation (if any); • surface differential rotation (SDR); • possible short-t ...
ON THE ORIGIN OF THE SALPETER SLOPE FOR THE INITIAL
... we are interested only in the upper IMF, however, scale-free cloud fragmentation plausibly dominates in this regime. But we note that our model contrasts with those in which the IMF slope results from physics that causes fragmentation into a steeper core mass distribution (e.g., Padoan & Nordlund 20 ...
... we are interested only in the upper IMF, however, scale-free cloud fragmentation plausibly dominates in this regime. But we note that our model contrasts with those in which the IMF slope results from physics that causes fragmentation into a steeper core mass distribution (e.g., Padoan & Nordlund 20 ...
HST observations of the field star population in the Large Magellanic
... suggests an age for the younger population of slightly less than 1 Gyr, or of ~ 2 Gyr, depending on the adopted metallicity. The redder peak corresponds to a population with age ~2-4 Gyr, again depending on metallicity. Given the proximity of our field to the bar, we tentatively identify the younger ...
... suggests an age for the younger population of slightly less than 1 Gyr, or of ~ 2 Gyr, depending on the adopted metallicity. The redder peak corresponds to a population with age ~2-4 Gyr, again depending on metallicity. Given the proximity of our field to the bar, we tentatively identify the younger ...
Some notes on the Inka constellations
... its location the names and significance of celestial objects. It is important to emphasize that within the astronomy of the Inkas there are two types of constellations: (a) Stellar constellations or bright stars, made up of individual bright stars which constitute a ‘constellation’ and grouped togeth ...
... its location the names and significance of celestial objects. It is important to emphasize that within the astronomy of the Inkas there are two types of constellations: (a) Stellar constellations or bright stars, made up of individual bright stars which constitute a ‘constellation’ and grouped togeth ...
Effect of the symmetry energy on gravitational waves from axial
... and only the perturbation of the spacetime, exists for all relativistic stars, including neutron star and black holes. ...
... and only the perturbation of the spacetime, exists for all relativistic stars, including neutron star and black holes. ...
Life of a Star - University of Texas Astronomy Home Page
... SOL: Yes. A lot like waking up, I suppose. As my density increased, my internal temperature had to go up. I was trading potential energy for kinetic energy. PAGE: How much time had passed since the collapse to this point? SOL: Oh not very long – a moment. 100,000 years. PAGE: What about the gas law? ...
... SOL: Yes. A lot like waking up, I suppose. As my density increased, my internal temperature had to go up. I was trading potential energy for kinetic energy. PAGE: How much time had passed since the collapse to this point? SOL: Oh not very long – a moment. 100,000 years. PAGE: What about the gas law? ...
THE ORIGIN AND EVOLUTION OF PLANETARY NEBULAE
... Planetary nebulae as a phase of stellar evolution At the beginning of the 20th Century, when stars were believed to evolve from high temperatures to low temperatures, PN were thought to be very young stars because of their high temperatures. From his studies of the velocity distribution of PN, Curti ...
... Planetary nebulae as a phase of stellar evolution At the beginning of the 20th Century, when stars were believed to evolve from high temperatures to low temperatures, PN were thought to be very young stars because of their high temperatures. From his studies of the velocity distribution of PN, Curti ...
PowerPoint Presentation - 16. Properties of Stars
... in many phases of life, just as we might study how humans age by observing the humans living in a village at one time. • What two basic physical properties do astronomers use to classify stars? • Stars are classified by their luminosity and surface temperature. These properties, in turn, depend prim ...
... in many phases of life, just as we might study how humans age by observing the humans living in a village at one time. • What two basic physical properties do astronomers use to classify stars? • Stars are classified by their luminosity and surface temperature. These properties, in turn, depend prim ...
THE SPECTRA OF FIVE IRREGULAR VARIABLE STARS George H
... Several of the strongest Fe n lines are present, as well as a very faint He ι λ 4471. On the plate of February 4, 1949, strong longward absorption fringes, with a displacement of +250 km/sec, are present at the Η and Can lines, but they are not visible on the other spectrograms. ...
... Several of the strongest Fe n lines are present, as well as a very faint He ι λ 4471. On the plate of February 4, 1949, strong longward absorption fringes, with a displacement of +250 km/sec, are present at the Η and Can lines, but they are not visible on the other spectrograms. ...
Empirical properties of Very Massive Stars
... 1 Historical background and definition Massive stars are usually defined as stars with masses higher than 8 M⊙ . In the standard picture of single star evolution, these objects end their lives as core collapse supernovae. Unlike lower mass stars, they go beyond the core carbon burning phase, and pro ...
... 1 Historical background and definition Massive stars are usually defined as stars with masses higher than 8 M⊙ . In the standard picture of single star evolution, these objects end their lives as core collapse supernovae. Unlike lower mass stars, they go beyond the core carbon burning phase, and pro ...
Chapter 7 Formation of metal-enriched 2nd generation objects 7.1
... pressure-balanced with the IGM after metal has spread several hundred parsecs from the initial halo. Comparison of the leftmost and rightmost columns shows that metal has spread to at least the distance of the nearest neighboring halos, though it is unclear at present how much metal has managed to g ...
... pressure-balanced with the IGM after metal has spread several hundred parsecs from the initial halo. Comparison of the leftmost and rightmost columns shows that metal has spread to at least the distance of the nearest neighboring halos, though it is unclear at present how much metal has managed to g ...
http://www.highpoint.edu/~afuller/PHY-1050
... layers into space. • If the initial mass of the star on the main sequence is not too large (< 25 Msun), the remnant inner core will stabilize and become a neutron star, supported by degenerate neutron pressure. • However, if the initial stellar mass is much larger, even the pressure of ...
... layers into space. • If the initial mass of the star on the main sequence is not too large (< 25 Msun), the remnant inner core will stabilize and become a neutron star, supported by degenerate neutron pressure. • However, if the initial stellar mass is much larger, even the pressure of ...
Astrophysics Pristine CNO abundances from Magellanic Cloud B stars
... changes due to dredge-up episodes in the red-giant phase and potentially rotational mixing in earlier phases when the rotation rate was still high. This is particularly true for stars located in the so-called Blue Hertzsprung Gap (between the MS and the region of blue-loop excursions, cf. Fitzpatric ...
... changes due to dredge-up episodes in the red-giant phase and potentially rotational mixing in earlier phases when the rotation rate was still high. This is particularly true for stars located in the so-called Blue Hertzsprung Gap (between the MS and the region of blue-loop excursions, cf. Fitzpatric ...
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.