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The Physics of Neutron Stars
The Physics of Neutron Stars

... consists of a fluid of primarily neutrons supported by neutron degeneracy pressure. Surrounding this core is a solid crust of neutron matter, often called “neutronium” by science fiction authors. The magnetic field of the neutron star is threaded through this solid surface, in a manner similar to th ...
S1-4-03 - Celestial Navigation
S1-4-03 - Celestial Navigation

... 1.True or false, using the North Star, you can estimate exactly where you are. (True. Measure the altitude of Polaris when departing, To return sail north or south, to bring Polaris to the altitude of home destination, then turn left or right as appropriate by sailing down the direction of the latit ...
TMSP Stellar Evolution & Life
TMSP Stellar Evolution & Life

... •BRIGHTNESS: how bright a star appears to our eyes and instruments, function of distance as well as intrinsic brightness or luminosity. •LUMINOSITY: how much energy the star is actually generating is a function of its mass (or size) and temperature (the big vs small bonfire analogy). •TEMPERATURE: s ...
Chapter 14 – Chemical Analysis
Chapter 14 – Chemical Analysis

... COG is independent of gravity • For ionized lines of ionized species (e.g Fe II in the Sun), the curves shift to the right with increasing gravity, roughly as g1/3 ...
SHELL H II REGIONS IN NGC 6334
SHELL H II REGIONS IN NGC 6334

... The Next Frontiers in Star Formation • With the availability of the SMA and the future construction of other interferometers we will start to study star formation with new frontiers: • Binary and multiple star formation • Star formation in the extremes (very massive stars and brown dwarfs) • Starbu ...
Centimeter and Millimeter Observations of Very Young Binary Systems
Centimeter and Millimeter Observations of Very Young Binary Systems

life cycles of stars
life cycles of stars

... Burns H in its core. Burns He in its core. Burns C and O in its core. Burns He in a shell around the core. ...
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Observational properties of stars

the life cycles of stars (5) - U3A Bendigo Courses / Activities
the life cycles of stars (5) - U3A Bendigo Courses / Activities

... sequence these stars emit material from their surface due to sheer radiation pressure. The strong light radiation carries gas with it. Our sun emits a solar wind of protons and electrons which can cause aurorae and in certain cases disrupt our electricity supply lines. In its later post main sequenc ...
Good Vibrations and Stellar Pulsations - Physics
Good Vibrations and Stellar Pulsations - Physics

Stellar Evolution : The Life and Death of Our Luminous Neighbors
Stellar Evolution : The Life and Death of Our Luminous Neighbors

... The light that moves outward through the sun is what astronomers call a continuous spectrum since the interior regions of the sun have high density. However, when the light reaches the low density region of the solar atmosphere called the chromosphere, some colors of light are absorbed. This occurs ...
Spectra PowerPoint
Spectra PowerPoint

... Three types of Spectra Continuous: from glowing solids or very compressed gases, such as the photosphere of the Sun Emission: from hot, glowing gases that are rarefied (not very compressed, such as an emission nebula or features in the solar atmosphere Absorption: a combination spectrum produced b ...
Chapter 3 Cosmology 3.1 The Doppler effect
Chapter 3 Cosmology 3.1 The Doppler effect

Order-of-Magnitude Astrophysics
Order-of-Magnitude Astrophysics

... white dwarfs have similar masses but radically different radii? Show that if m1 = m2 (as in a neutron star), a Chandrasekhar-mass object is always near the border of collapse to a black hole. 38. What is the best observational upper limit that Isaac Newton could have put on the amount of uniformly d ...
Stars: Their Life and Afterlife
Stars: Their Life and Afterlife

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... R: spectral resolving power S/N: signal to noise ratio Dl : wavelength coverage of spectrograph in Angstroms For R=110.000, S/N=150, Dl=2000 Å, s = 2 m/s ...
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AST1100 Lecture Notes

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Earth_Universe04

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Why Star Positions?

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Lecture 8a Star Formation 10/15/2014

AST1100 Lecture Notes
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... of energy carried outwards by the shock wave could in principle have blown the whole star apart, but the wave is blocked by the outer core where the energy is absorbed in photo disintegration and electron capture processes. The final part of the story is truly remarkable. We see that the electron ca ...
MHD_of_Accretion_Disks
MHD_of_Accretion_Disks

... Observing the formation and evolution of circumstellar disks is crucial for understanding the star formation and planet-building processes. If a disk becomes sufficiently massive, compared to the central object that it surrounds, a gravitational instability in the system may cause the disk to accumu ...
Chapter 24
Chapter 24

... Properties of stars Distance • Measuring a star's distance can be very difficult • Stellar parallax • Used for measuring distance to a star • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is l ...
Observations of gravitational microlensing events with OSIRIS
Observations of gravitational microlensing events with OSIRIS

Chapter 2 Surveying the stars 2.1 Star magnitudes
Chapter 2 Surveying the stars 2.1 Star magnitudes

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Dyson sphere

A Dyson sphere is a hypothetical megastructure that completely encompasses a star and hence captures most or all of its power output. It was first described by Olaf Stapledon in his science fiction novel, ""Star Maker"". The concept was later popularly adopted by Freeman Dyson. Dyson speculated that such structures would be the logical consequence of the long-term survival and escalating energy needs of a technological civilization, and proposed that searching for evidence of the existence of such structures might lead to the detection of advanced intelligent extraterrestrial life. Different types of Dyson spheres correlate with information on the Kardashev scale.Since then, other variant designs involving building an artificial structure or series of structures to encompass a star have been proposed in exploratory engineering or described in science fiction under the name ""Dyson sphere"". These later proposals have not been limited to solar-power stations. Many involve habitation or industrial elements. Most fictional depictions describe a solid shell of matter enclosing a star, which is considered the least plausible variant of the idea (see below). In May 2013, at the Starship Century Symposium in San Diego, Dyson repeated his comments that he wished the concept had not been named after him.
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