Energy sources
... Stars: energy source: Gravitational Energy • As molecular cloud contracts, gravitational potential energy of particles is converted into kinetic energy. • With higher kinetic energies, the collision rate between particles increases, i.e. temperature and thermal radiation increase. • At sufficiently ...
... Stars: energy source: Gravitational Energy • As molecular cloud contracts, gravitational potential energy of particles is converted into kinetic energy. • With higher kinetic energies, the collision rate between particles increases, i.e. temperature and thermal radiation increase. • At sufficiently ...
3. Galactic Dynamics handout 3 Aim: understand equilibrium of
... • Analytic approximations necessary for a better understanding of solution In the following we investigate properties of gravitational systems without explicitly solving the equations of motion. 3.2 Do stars collide ? ...
... • Analytic approximations necessary for a better understanding of solution In the following we investigate properties of gravitational systems without explicitly solving the equations of motion. 3.2 Do stars collide ? ...
Lecture 4-Energy sources
... Stars: energy source: Gravitational Energy • As molecular cloud contracts, gravitational potential energy of particles is converted into kinetic energy. • With higher kinetic energies, the collision rate between particles increases, i.e. temperature and thermal radiation increase. • At sufficiently ...
... Stars: energy source: Gravitational Energy • As molecular cloud contracts, gravitational potential energy of particles is converted into kinetic energy. • With higher kinetic energies, the collision rate between particles increases, i.e. temperature and thermal radiation increase. • At sufficiently ...
Return both exam and scantron sheet when you
... 37. When does the intensity of the solar wind have the highest value? (a) During the solar activity maximum as measured by the number of sunspots. (b) During the solar activity minimum as measured by the number of sunspots. (c) The intensity of the solar wind does not depend on the solar activity. 3 ...
... 37. When does the intensity of the solar wind have the highest value? (a) During the solar activity maximum as measured by the number of sunspots. (b) During the solar activity minimum as measured by the number of sunspots. (c) The intensity of the solar wind does not depend on the solar activity. 3 ...
Galaxies and Stars
... 66. Base your answer to the following question on the diagram below, which shows an inferred sequence in which our solar system formed from a giant interstellar cloud of gas and debris. Stage A shows the collapse of the gas cloud, stage B shows its flattening, and stage C shows the sequence that le ...
... 66. Base your answer to the following question on the diagram below, which shows an inferred sequence in which our solar system formed from a giant interstellar cloud of gas and debris. Stage A shows the collapse of the gas cloud, stage B shows its flattening, and stage C shows the sequence that le ...
Antares - Emmi
... handsome man. He bragged that he would kill every animal on Earth. Apollo guardian of the cows pleaded with Hera the queen of the gods to send a scorpion with impenetrable armor to kill Orion which the scorpion succeeded . When the Greeks saw the stars and they way they all connected they saw the sc ...
... handsome man. He bragged that he would kill every animal on Earth. Apollo guardian of the cows pleaded with Hera the queen of the gods to send a scorpion with impenetrable armor to kill Orion which the scorpion succeeded . When the Greeks saw the stars and they way they all connected they saw the sc ...
Thursday October 1 - Montana State University
... Include last names and team number on all activities! ...
... Include last names and team number on all activities! ...
The Sky is Our Laboratory
... • A galaxy is a body of stars, gas, and dark matter kept together by gravity; • The `cosmos’ is a loose definition to indicate the Universe, or components of it. It comes from Greek, to indicate an harmonious whole, opposed to chaos. ...
... • A galaxy is a body of stars, gas, and dark matter kept together by gravity; • The `cosmos’ is a loose definition to indicate the Universe, or components of it. It comes from Greek, to indicate an harmonious whole, opposed to chaos. ...
The Formation of Low Mass Stars: Overview and Recent
... Outflow starts early, strong effect on lines Rotation on small scales ...
... Outflow starts early, strong effect on lines Rotation on small scales ...
20_LectureOutline
... 20.4 Evolution of Stars More Massive than the Sun High-mass stars, like all stars, leave the main sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars—first a hydrogen shell, then a core burning helium to carbon, surrounded by he ...
... 20.4 Evolution of Stars More Massive than the Sun High-mass stars, like all stars, leave the main sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars—first a hydrogen shell, then a core burning helium to carbon, surrounded by he ...
WEBDA - a tool for CP star research in open clusters
... success of WEBDA is documented by its worldwide usage and the related acknowledgements in the literature: more than 450 refereed publications within the last seven years acknowledge its use. It collects all published data for stars in open clusters that may be useful either to determine membership, ...
... success of WEBDA is documented by its worldwide usage and the related acknowledgements in the literature: more than 450 refereed publications within the last seven years acknowledge its use. It collects all published data for stars in open clusters that may be useful either to determine membership, ...
Type II supernovae (Inma Dominguez)
... At central He exhaustion, He burning moves to a shell just outside the CO core The following evolution is characterized by the development of a convective He-burning shell limited by the CO core and by the H-burning shell. The chemical composition of this shell, that will be active till the collapse ...
... At central He exhaustion, He burning moves to a shell just outside the CO core The following evolution is characterized by the development of a convective He-burning shell limited by the CO core and by the H-burning shell. The chemical composition of this shell, that will be active till the collapse ...
Neutron Star
... As the planets orbit around the pulsar, they cause it to wobble around, resulting in slight changes of the observed pulsar period. ...
... As the planets orbit around the pulsar, they cause it to wobble around, resulting in slight changes of the observed pulsar period. ...
Earth and Beyond - Prairie Rose School Division No. 8
... matter from the star will spiral into the black hole and as it does so the matter emits X ray radiation which can be detected. ...
... matter from the star will spiral into the black hole and as it does so the matter emits X ray radiation which can be detected. ...
QDSpaperFred1.tex
... and other high-density stars with eq. 4. Eq. 5 eliminates most normal and all giant stars. Eq. 3 eliminates hot stars, even on the main sequence, because we do not expect them to live long enough for intelligest life to develop. Eq. 1 limits the sample to stars with accurately measured distances. Th ...
... and other high-density stars with eq. 4. Eq. 5 eliminates most normal and all giant stars. Eq. 3 eliminates hot stars, even on the main sequence, because we do not expect them to live long enough for intelligest life to develop. Eq. 1 limits the sample to stars with accurately measured distances. Th ...
Stellar evolution
Stellar evolution is the process by which a star changes during its lifetime. Depending on the mass of the star, this lifetime ranges from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses. All stars are born from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star.Nuclear fusion powers a star for most of its life. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core. This process causes the star to gradually grow in size, passing through the subgiant stage until it reaches the red giant phase. Stars with at least half the mass of the Sun can also begin to generate energy through the fusion of helium at their core, whereas more-massive stars can fuse heavier elements along a series of concentric shells. Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula. Stars with around ten or more times the mass of the Sun can explode in a supernova as their inert iron cores collapse into an extremely dense neutron star or black hole. Although the universe is not old enough for any of the smallest red dwarfs to have reached the end of their lives, stellar models suggest they will slowly become brighter and hotter before running out of hydrogen fuel and becoming low-mass white dwarfs.Stellar evolution is not studied by observing the life of a single star, as most stellar changes occur too slowly to be detected, even over many centuries. Instead, astrophysicists come to understand how stars evolve by observing numerous stars at various points in their lifetime, and by simulating stellar structure using computer models.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.