Gravity`s Influence on the Development of the Solar System
... While the inner region went through variations in temperature during the sun’s evolution and remained hot, the temperatures in the outer region remained low, less than 50 K. Ice particles and ice-coated dust grains, which were unable to remain solid in the inner region due to high temperatures, surv ...
... While the inner region went through variations in temperature during the sun’s evolution and remained hot, the temperatures in the outer region remained low, less than 50 K. Ice particles and ice-coated dust grains, which were unable to remain solid in the inner region due to high temperatures, surv ...
White Dwarfs - Indiana University
... – All WDs have a common origin (PNN) with some hydrogen, upper limit of 10-4 solar masses to 10-15 solar masses of hydrogen (recall that 10-4 is the limit where H burning stops) – Only about 10-15 is needed to produce an optically thick H layer at the ...
... – All WDs have a common origin (PNN) with some hydrogen, upper limit of 10-4 solar masses to 10-15 solar masses of hydrogen (recall that 10-4 is the limit where H burning stops) – Only about 10-15 is needed to produce an optically thick H layer at the ...
ppt file
... events (novae)… form a planetary nebula He or C core remains as a white dwarf… dense (stellar mass but size of Earth) and hot ...
... events (novae)… form a planetary nebula He or C core remains as a white dwarf… dense (stellar mass but size of Earth) and hot ...
Death of massive stars
... • It is a common misconception to think of black holes as giant vacuum cleaners that will suck up everything in the universe. A black hole is just a dead star with a massive gravitational field. At a reasonably large distance, its gravity is no greater than that of a normal object of similar mass. I ...
... • It is a common misconception to think of black holes as giant vacuum cleaners that will suck up everything in the universe. A black hole is just a dead star with a massive gravitational field. At a reasonably large distance, its gravity is no greater than that of a normal object of similar mass. I ...
BV Color Index and Temperature - The University of Texas at Dallas
... • give a factor of 1.4 to 1.8 × variation in the resultant distance. • increases as the stellar distance increases only accurate enough to measure stellar distances of up to about 10 Mpc. • star has to be sufficiently bright to be able to measure the spectrum • can be obscured by matter between the ...
... • give a factor of 1.4 to 1.8 × variation in the resultant distance. • increases as the stellar distance increases only accurate enough to measure stellar distances of up to about 10 Mpc. • star has to be sufficiently bright to be able to measure the spectrum • can be obscured by matter between the ...
telescope as time machine - Galaxy Evolution Explorer
... Scientists know that the universe is expanding. Like a chocolate chip cake in the oven, space is the “cake batter” that keeps getting bigger and bigger, while the stars and galaxies are the “chocolate chips” that keep getting farther and farther apart. Like energy pulsing through the ocean, light en ...
... Scientists know that the universe is expanding. Like a chocolate chip cake in the oven, space is the “cake batter” that keeps getting bigger and bigger, while the stars and galaxies are the “chocolate chips” that keep getting farther and farther apart. Like energy pulsing through the ocean, light en ...
Sections F and G
... The luminosity emitted by the accretion disc has its origin in the potential energy lost by the gas as it falls into the potential well of the white dwarf. X-ray Sources Most stars, such as the Sun, are only weak X-ray sources. But there are several hundred strong Xray emitting sources in the Galaxy ...
... The luminosity emitted by the accretion disc has its origin in the potential energy lost by the gas as it falls into the potential well of the white dwarf. X-ray Sources Most stars, such as the Sun, are only weak X-ray sources. But there are several hundred strong Xray emitting sources in the Galaxy ...
X-ray emission and the incidence of magnetic fields in the massive
... stars) was studied with the goal of disentangling the respective roles of winds and magnetic fields in producing X-rays (Stelzer et al. 2005). The production of X-rays by radiative shocks should be the dominant mechanism for the subsample of 9 O to early-B stars which have «strong winds». However, a ...
... stars) was studied with the goal of disentangling the respective roles of winds and magnetic fields in producing X-rays (Stelzer et al. 2005). The production of X-rays by radiative shocks should be the dominant mechanism for the subsample of 9 O to early-B stars which have «strong winds». However, a ...
Slide 1
... To produce WR stars and neutron stars we may be forced to appeal to episodic mass loss, perhaps through numerous LBV stages (eg Smith and Owocki 2006) rather than continual stellar winds, with major differences in the nature of the energy and enriched gas injected into the ISM. Radio free-free fluxe ...
... To produce WR stars and neutron stars we may be forced to appeal to episodic mass loss, perhaps through numerous LBV stages (eg Smith and Owocki 2006) rather than continual stellar winds, with major differences in the nature of the energy and enriched gas injected into the ISM. Radio free-free fluxe ...
Lecture 13
... In some cases astronomers can detect shifts as small as one part in a million. That implies detection of motion as small as 300m/s. ...
... In some cases astronomers can detect shifts as small as one part in a million. That implies detection of motion as small as 300m/s. ...
Star Types
... sun, an O star, a white dwarf, or a red giant? Which of these star is the hottest? What are Sun-like stars (0.4 Msun < M < 8 Msun) in common? What about red dwarfs (0.08 Msun < M < 0.4 Msun) ? Where do stars spend most of their time? ...
... sun, an O star, a white dwarf, or a red giant? Which of these star is the hottest? What are Sun-like stars (0.4 Msun < M < 8 Msun) in common? What about red dwarfs (0.08 Msun < M < 0.4 Msun) ? Where do stars spend most of their time? ...
Nov 2017 - What`s Out Tonight?
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
Stellar Evolution II
... Larger clouds of gas (GMCs) tend to fragment into smaller ones before collapsing to form stars – very massive stars are rare • Stars with masses above 50 MSUN are unstable – nuclear reactions in their core produce energy at such a fast rate that they blow off their outer layers, losing mass. ...
... Larger clouds of gas (GMCs) tend to fragment into smaller ones before collapsing to form stars – very massive stars are rare • Stars with masses above 50 MSUN are unstable – nuclear reactions in their core produce energy at such a fast rate that they blow off their outer layers, losing mass. ...
Globular Cluster in Canes Venatici
... stars within each cubic light year) than in the Sun’s neighborhood. If the earth orbitted a star located in a globular cluster, the next nearest star would be light months away rather than light years. ...
... stars within each cubic light year) than in the Sun’s neighborhood. If the earth orbitted a star located in a globular cluster, the next nearest star would be light months away rather than light years. ...
05spectralclasses
... that hydrogen electrons will be in the n = 2 level • But for very hot stars, hydrogen will lose its electrons completely ...
... that hydrogen electrons will be in the n = 2 level • But for very hot stars, hydrogen will lose its electrons completely ...
Light, spectra, Doppler shifts
... If you take an evacuated glass tube, fill it with hydrogen gas, and apply a voltage (i.e., “light it up like a neon sign”), it will produce light at very specific wavelengths. If viewed with a diffraction grating or spectrograph, the bright lines produced will have wavelengths of: ...
... If you take an evacuated glass tube, fill it with hydrogen gas, and apply a voltage (i.e., “light it up like a neon sign”), it will produce light at very specific wavelengths. If viewed with a diffraction grating or spectrograph, the bright lines produced will have wavelengths of: ...
Light, spectra, Doppler shifts
... If you take an evacuated glass tube, fill it with hydrogen gas, and apply a voltage (i.e., “light it up like a neon sign”), it will produce light at very specific wavelengths. If viewed with a diffraction grating or spectrograph, the bright lines produced will have wavelengths of: ...
... If you take an evacuated glass tube, fill it with hydrogen gas, and apply a voltage (i.e., “light it up like a neon sign”), it will produce light at very specific wavelengths. If viewed with a diffraction grating or spectrograph, the bright lines produced will have wavelengths of: ...
The HR Diagram (PowerPoint version)
... sciences: namely, look for correlations between various attributes! In other words, see if any one property appears to depend on any other. This may provide helpful insights. A century ago, we had little astrophysical information to play with, essentially only the following: - stellar colours - what ...
... sciences: namely, look for correlations between various attributes! In other words, see if any one property appears to depend on any other. This may provide helpful insights. A century ago, we had little astrophysical information to play with, essentially only the following: - stellar colours - what ...
Life Cycle of a Star
... • Main sequence stars are stars that are fusing hydrogen atoms to form helium atoms in their cores. • These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. ...
... • Main sequence stars are stars that are fusing hydrogen atoms to form helium atoms in their cores. • These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. ...
PREVIEW-Reading Quiz 06 - Chapter 12
... "Quantum mechanics restricts the number of electrons that can have low energy. Basically, each electron must occupy its own energy state. When electrons are packed together, as they are in a white dwarf, the number of available low energy states is too small and many electrons are forced into high e ...
... "Quantum mechanics restricts the number of electrons that can have low energy. Basically, each electron must occupy its own energy state. When electrons are packed together, as they are in a white dwarf, the number of available low energy states is too small and many electrons are forced into high e ...
Stellar Evolution
... and diameter. In fact, astronomers have discovered that the mass and the composition (makeup) of a star determine nearly all its other properties. ...
... and diameter. In fact, astronomers have discovered that the mass and the composition (makeup) of a star determine nearly all its other properties. ...
Beatrice Muriel Hill Tinsley
... numbers : its total mass, the fraction of gas turned into stars in each generation, the mix of mass formed and the age of the galaxy. And the output could be given as the time-history of the luminosity, colour, chemical composition, and residual gas mass of the model. The first happy result was that ...
... numbers : its total mass, the fraction of gas turned into stars in each generation, the mix of mass formed and the age of the galaxy. And the output could be given as the time-history of the luminosity, colour, chemical composition, and residual gas mass of the model. The first happy result was that ...
Life Cycle of a Star
... • Main sequence stars are stars that are fusing hydrogen atoms to form helium atoms in their cores. • These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. ...
... • Main sequence stars are stars that are fusing hydrogen atoms to form helium atoms in their cores. • These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.