COM 2014 January
... King Acrisius of Argos was warned by an oracle that one day he would be killed by his own grandson. To prevent any likelihood of this ever happening, he locked away his beautiful daughter, Danae, so that no man could ever reach her. But this did not stop the god Zeus, with his fondness for mortal wo ...
... King Acrisius of Argos was warned by an oracle that one day he would be killed by his own grandson. To prevent any likelihood of this ever happening, he locked away his beautiful daughter, Danae, so that no man could ever reach her. But this did not stop the god Zeus, with his fondness for mortal wo ...
Physics@Brock - Brock University
... 71. Most stars are born with approximately the following composition. (a) About 50% hydrogen, about 50% helium, and less than 2% heavier elements. (b) About 60% hydrogen, about 40% helium, and less than 2% heavier elements. (c) About 75% hydrogen, about 25% helium, and less than 2% heavier elements. ...
... 71. Most stars are born with approximately the following composition. (a) About 50% hydrogen, about 50% helium, and less than 2% heavier elements. (b) About 60% hydrogen, about 40% helium, and less than 2% heavier elements. (c) About 75% hydrogen, about 25% helium, and less than 2% heavier elements. ...
Ch. 21
... has accumulated too much mass from binary companion If the white dwarf’s mass exceeds 1.4 solar masses, electron degeneracy can no longer keep the core from collapsing. Carbon fusion begins throughout the star almost simultaneously, resulting in a carbon explosion. ...
... has accumulated too much mass from binary companion If the white dwarf’s mass exceeds 1.4 solar masses, electron degeneracy can no longer keep the core from collapsing. Carbon fusion begins throughout the star almost simultaneously, resulting in a carbon explosion. ...
The Galaxies
... with a speed proportional to distance, there must have been a beginning, when everything was concentrated in one single point: ...
... with a speed proportional to distance, there must have been a beginning, when everything was concentrated in one single point: ...
Star Light, Star Bright
... and traces of oxygen, neon, carbon, nitrogen, and other elements. Hydrogen provides the fuel for stars to release heat, light, and other forms of energy through a process called nuclear fusion. When the center of a star reaches a temperature of 2,000,000 degrees Fahrenheit, hydrogen gas is changed t ...
... and traces of oxygen, neon, carbon, nitrogen, and other elements. Hydrogen provides the fuel for stars to release heat, light, and other forms of energy through a process called nuclear fusion. When the center of a star reaches a temperature of 2,000,000 degrees Fahrenheit, hydrogen gas is changed t ...
8.8D Light Years
... Light years also help scientists observe conditions at an earlier point in the universe. As you gaze up into the night sky, the twinkling little lights that you see may not even be present anymore. If a star is three million light years away, then its light has traveled for three million years to re ...
... Light years also help scientists observe conditions at an earlier point in the universe. As you gaze up into the night sky, the twinkling little lights that you see may not even be present anymore. If a star is three million light years away, then its light has traveled for three million years to re ...
WSN 42 (2016) 132-142
... star has a multi-stage life cycle during which the size and its temperature varies greatly. The mass of each star (the amount of matter in the star) main determinant of long-lived stars, and how it is evolving. The greater the mass of the star, in a nuclear reactor gases burn quickly and die sooner. ...
... star has a multi-stage life cycle during which the size and its temperature varies greatly. The mass of each star (the amount of matter in the star) main determinant of long-lived stars, and how it is evolving. The greater the mass of the star, in a nuclear reactor gases burn quickly and die sooner. ...
How to Plot the H-R Diagram and Use its Applications
... star has a multi-stage life cycle during which the size and its temperature varies greatly. The mass of each star (the amount of matter in the star) main determinant of long-lived stars, and how it is evolving. The greater the mass of the star, in a nuclear reactor gases burn quickly and die sooner. ...
... star has a multi-stage life cycle during which the size and its temperature varies greatly. The mass of each star (the amount of matter in the star) main determinant of long-lived stars, and how it is evolving. The greater the mass of the star, in a nuclear reactor gases burn quickly and die sooner. ...
Bolte_LRIS_08A
... The Dwarf galaxy Abundances and Radial-velocities Team (DART) project using the ESO VLT/FLAMES facility measured abundances for a large number of giants in the dSph galaxies Sculptor, Fornax, Sextans and Carina. Their results show that while there are large dSph-to-dSph differences in the metallicit ...
... The Dwarf galaxy Abundances and Radial-velocities Team (DART) project using the ESO VLT/FLAMES facility measured abundances for a large number of giants in the dSph galaxies Sculptor, Fornax, Sextans and Carina. Their results show that while there are large dSph-to-dSph differences in the metallicit ...
The Sky This Month
... • Equi (equal) nox (night) – equal night and day…approximately. • On the Equinox the Sun shines down directly on the equator – your shadow is just beneath your feet. • Winter Solstice : Sun directly overhead at the (northern) tropic of Cancer. • Summer Solstice : Sun directly overhead at the (Southe ...
... • Equi (equal) nox (night) – equal night and day…approximately. • On the Equinox the Sun shines down directly on the equator – your shadow is just beneath your feet. • Winter Solstice : Sun directly overhead at the (northern) tropic of Cancer. • Summer Solstice : Sun directly overhead at the (Southe ...
Sin título de diapositiva - Universitat de Barcelona
... The GAIA mission, the next ESA Cornerstone 6 (launch 2010- 2012), will create a precise three dimensional map of about one billion stars throughout our Galaxy and beyond. To reach the scientific goals, that is to quantify the dynamical, chemical and star formation evolution of the Milky Way, it is c ...
... The GAIA mission, the next ESA Cornerstone 6 (launch 2010- 2012), will create a precise three dimensional map of about one billion stars throughout our Galaxy and beyond. To reach the scientific goals, that is to quantify the dynamical, chemical and star formation evolution of the Milky Way, it is c ...
Stellar Explosions
... has accumulated too much mass from binary companion If the white dwarf’s mass exceeds 1.4 solar masses, electron degeneracy can no longer keep the core from collapsing. Carbon fusion begins throughout the star almost simultaneously, resulting in a carbon explosion. ...
... has accumulated too much mass from binary companion If the white dwarf’s mass exceeds 1.4 solar masses, electron degeneracy can no longer keep the core from collapsing. Carbon fusion begins throughout the star almost simultaneously, resulting in a carbon explosion. ...
The Sun Like Star : HT Vir
... The light curves and data in the V band of HT Vir variable in the ASAS catalog have been taken into account (Pojmanski, 1997). The graphics according to the time (HJD) of the magnitudes (Vmag) is given in Figure1. The light curve according to phase of the stars is given in Figure2. The light curve c ...
... The light curves and data in the V band of HT Vir variable in the ASAS catalog have been taken into account (Pojmanski, 1997). The graphics according to the time (HJD) of the magnitudes (Vmag) is given in Figure1. The light curve according to phase of the stars is given in Figure2. The light curve c ...
Chapter 3 Cosmology 3.1 The Doppler effect
... from other galaxies. Many more observations since then have confirmed the Universe is accelerating. Scientists think that no known force could cause an acceleration of the expansion of the Universe and that therefore a previously unknown type of force must be releasing hidden energy called dark ener ...
... from other galaxies. Many more observations since then have confirmed the Universe is accelerating. Scientists think that no known force could cause an acceleration of the expansion of the Universe and that therefore a previously unknown type of force must be releasing hidden energy called dark ener ...
across
... Chemical burning is a way to generate heat. Chemical reactions (burning) could power the Sun for ~3,000 years. This agreed with religious dogma at the time. ...
... Chemical burning is a way to generate heat. Chemical reactions (burning) could power the Sun for ~3,000 years. This agreed with religious dogma at the time. ...
Stars (Ch. 13)
... mass. • More massive stars are more luminous, they release energy at a higher rate and are located towards the upper left of the Main Sequence. (They also consume Hydrogen ...
... mass. • More massive stars are more luminous, they release energy at a higher rate and are located towards the upper left of the Main Sequence. (They also consume Hydrogen ...
Galaxies
... visual appearance does not allow us to place them into any of the other categories just discussed. Irregulars tend to be rich in interstellar matter and young, blue stars, but they lack any regular structure such as well-defined spiral arms or central bulges. They are conventionally divided into two ...
... visual appearance does not allow us to place them into any of the other categories just discussed. Irregulars tend to be rich in interstellar matter and young, blue stars, but they lack any regular structure such as well-defined spiral arms or central bulges. They are conventionally divided into two ...
What is a star?
... They added to the magnitude system. • Today, the brightest stars have a magnitude of about –2, and the faintest stars that we can see with a telescope have a magnitude of +30. • Dim stars have positive (larger) numbers, and bright stars have negative (smaller) numbers. ...
... They added to the magnitude system. • Today, the brightest stars have a magnitude of about –2, and the faintest stars that we can see with a telescope have a magnitude of +30. • Dim stars have positive (larger) numbers, and bright stars have negative (smaller) numbers. ...
(Relative) Distances from the HST Snapshot Database
... Canonical models predict that the HeII convective region approaches the stellar surface in the ZAHB structures at T=23.000. In addition, mass loss, which is a competing process to diffusion increases with effective temperature. As a result, radiative levitation is less and less effective in the temp ...
... Canonical models predict that the HeII convective region approaches the stellar surface in the ZAHB structures at T=23.000. In addition, mass loss, which is a competing process to diffusion increases with effective temperature. As a result, radiative levitation is less and less effective in the temp ...
Omega Centauri
... “A Simple Stellar Population (SSP) is defined as an assembly of coeval, initially chemically homogeneous, single stars. Four main parameters are required to describe a SSP, namely its age, composition (Y, Z) and initial mass function. In nature, the best examples of SSP’s are the star clusters….” Re ...
... “A Simple Stellar Population (SSP) is defined as an assembly of coeval, initially chemically homogeneous, single stars. Four main parameters are required to describe a SSP, namely its age, composition (Y, Z) and initial mass function. In nature, the best examples of SSP’s are the star clusters….” Re ...
The HR Diagram - Faculty Web Pages
... brightnesses. Now let's see if we can find some relationships between these stellar properties. We know that hotter stars are brighter, as described by the Stefan-Boltzmann Law, and we know that the hotter stars are also bluer, as described by Wien's Law. The H-R diagram is a way of displaying an im ...
... brightnesses. Now let's see if we can find some relationships between these stellar properties. We know that hotter stars are brighter, as described by the Stefan-Boltzmann Law, and we know that the hotter stars are also bluer, as described by Wien's Law. The H-R diagram is a way of displaying an im ...
March 2010 - Pomona Valley Amateur Astronomers
... was Hubble who first proved that known "spiral nebulae" were actually enormous groups of stars like out own Milky Way. He studied the closer dwarf galaxies and the Andromeda Galaxy to determine their distances. It was then he developed Hubble's Law stating that the more distant a galaxy is, the fast ...
... was Hubble who first proved that known "spiral nebulae" were actually enormous groups of stars like out own Milky Way. He studied the closer dwarf galaxies and the Andromeda Galaxy to determine their distances. It was then he developed Hubble's Law stating that the more distant a galaxy is, the fast ...
CosmologyL2
... Distances to Galaxies: Step by step approach (the distance ladder) based on the assumption that cepheids, RR Lyrae stars have the same properties in other galaxies. The same for the SN explosions. These assumptions are supported by essentially the same spectra and light curves. variable stars: up t ...
... Distances to Galaxies: Step by step approach (the distance ladder) based on the assumption that cepheids, RR Lyrae stars have the same properties in other galaxies. The same for the SN explosions. These assumptions are supported by essentially the same spectra and light curves. variable stars: up t ...
Order-of-Magnitude Astrophysics
... 12 kpc. What is the minimum possible space velocity of this moving blob? If the blob has mass m, how much energy was required to accelerate it to this velocity? ...
... 12 kpc. What is the minimum possible space velocity of this moving blob? If the blob has mass m, how much energy was required to accelerate it to this velocity? ...
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.