Chapter 13 - USD Home Pages
... a white dwarf might be at several hundred million K, but this extremely high temperature contributes only a small amount of the pressure, compared to EDP. As a result, as a white dwarf cools down, the decrease in total pressure (EDP plus thermodynamic) is slight, so the white dwarf does not shrink a ...
... a white dwarf might be at several hundred million K, but this extremely high temperature contributes only a small amount of the pressure, compared to EDP. As a result, as a white dwarf cools down, the decrease in total pressure (EDP plus thermodynamic) is slight, so the white dwarf does not shrink a ...
supernova - Michigan State University
... If a stellar core grows beyond its Chandrasekhar mass limit, it will collapse. Typically this will result in a Supernova explosion at least the outer part of a star is blown off into space ...
... If a stellar core grows beyond its Chandrasekhar mass limit, it will collapse. Typically this will result in a Supernova explosion at least the outer part of a star is blown off into space ...
word document - FacStaff Home Page for CBU
... and the universe in Part 5. In Section E we try to first of all categorize all the different types of stars. We then try to relate these categories into an evolutionary scheme for stars that is based on how we think a star works. ...
... and the universe in Part 5. In Section E we try to first of all categorize all the different types of stars. We then try to relate these categories into an evolutionary scheme for stars that is based on how we think a star works. ...
1” “Sky-Notes” of the Open University Astronomy Club. September
... Nebula", may just be detected east of Deneb (1.3) by the unaided eye. It shows up well in photographs together with the adjacent IC5067/70, the "Pelican Nebula". NGC7027 (10.4) en. Strange object identified as a star, then a planetary nebula and currently an emission nebula. NGC7048 (11.3) pn. NGC70 ...
... Nebula", may just be detected east of Deneb (1.3) by the unaided eye. It shows up well in photographs together with the adjacent IC5067/70, the "Pelican Nebula". NGC7027 (10.4) en. Strange object identified as a star, then a planetary nebula and currently an emission nebula. NGC7048 (11.3) pn. NGC70 ...
YSO/PMS disk types, time-scales and evolution from 1
... We created a new sample of objects that had full spectroscopic data, this means the Spectral types of the stars could be constrained We include only stars that are Class II and III from (Greene et al. 1994) ...
... We created a new sample of objects that had full spectroscopic data, this means the Spectral types of the stars could be constrained We include only stars that are Class II and III from (Greene et al. 1994) ...
The Galaxy Presentation 2011
... •Early 1900’s - Kapteyn used stellar parallax to estimate the true size of the Galaxy Kapteyn Universe •10kpc diameter and 2kpc thick with the Sun less than a kpc from the center (rather heliocentric) •Tried to estimate Rayleigh scattering due to ISM gas but determined it to be insignificant (bec ...
... •Early 1900’s - Kapteyn used stellar parallax to estimate the true size of the Galaxy Kapteyn Universe •10kpc diameter and 2kpc thick with the Sun less than a kpc from the center (rather heliocentric) •Tried to estimate Rayleigh scattering due to ISM gas but determined it to be insignificant (bec ...
N(M)
... impact the surrounding ISM and ionize it, making the jets visible. The jet creates bow-shocks, where the supersonic flow collides with the stationary ambient gas. In reality, the jet ‘lights up’ several dense knots along its path: these knots possibly mark previous ejection episodes from the protosta ...
... impact the surrounding ISM and ionize it, making the jets visible. The jet creates bow-shocks, where the supersonic flow collides with the stationary ambient gas. In reality, the jet ‘lights up’ several dense knots along its path: these knots possibly mark previous ejection episodes from the protosta ...
Misc-ReviewForAstroTest
... 2. A graduate student named Jocelyn Bell Burnell discovered a strong night time source of “twinkling”. 3. Its location was fixed with respect to the stars. From Jay Pasachoff’s “Contemporary Astronomy” ...
... 2. A graduate student named Jocelyn Bell Burnell discovered a strong night time source of “twinkling”. 3. Its location was fixed with respect to the stars. From Jay Pasachoff’s “Contemporary Astronomy” ...
Fifth - Department of Physics and Astronomy
... • Magnetic flux is also conserved such that the surface B fields is intensified. • The rotating B field creates an E field that rips charged particles from the surface of the star, which later get beamed by the B field and ejected at the poles. • They were discovered during a radio survey of the Gal ...
... • Magnetic flux is also conserved such that the surface B fields is intensified. • The rotating B field creates an E field that rips charged particles from the surface of the star, which later get beamed by the B field and ejected at the poles. • They were discovered during a radio survey of the Gal ...
Stellar Evolution – Life of a Star
... • White Dwarfs are also burning, but these stars burn heavier elements (e.g. C). Each burning creates and burns a heavier element (e.g, Ne, O, Si, S and Fe). The burning raises the core temperature and each elemental burning period is shorter than the previous. Fusion cannot continue after Fe, inter ...
... • White Dwarfs are also burning, but these stars burn heavier elements (e.g. C). Each burning creates and burns a heavier element (e.g, Ne, O, Si, S and Fe). The burning raises the core temperature and each elemental burning period is shorter than the previous. Fusion cannot continue after Fe, inter ...
Zairamink_Lifecycle of a Star
... super nova the protons and electrons of atoms are forced together into neutrons. When neutron stars form, they maintain the momentum of the entire star, but now they're just a few kilometers across. This causes them to spin at tremendous rates, sometimes as fast as hundreds of times a second. Just o ...
... super nova the protons and electrons of atoms are forced together into neutrons. When neutron stars form, they maintain the momentum of the entire star, but now they're just a few kilometers across. This causes them to spin at tremendous rates, sometimes as fast as hundreds of times a second. Just o ...
1. If a star`s temperature is doubled but radius is kept constant, by
... All stars with LC=V. Which stars are supergiants? All stars with LC=I. If a star is cool and bright, which region of the HR diagram is it in? Top right. What is a spectrum? The way the light emitted by an object varies with wavelength. Which stars might have the most similar spectra? Probably Regulu ...
... All stars with LC=V. Which stars are supergiants? All stars with LC=I. If a star is cool and bright, which region of the HR diagram is it in? Top right. What is a spectrum? The way the light emitted by an object varies with wavelength. Which stars might have the most similar spectra? Probably Regulu ...
solution - Evergreen Archives
... the typical sizes of brighter structures in the cosmic microwave background. the ratio of the average density of matter to that of radiation energy in the universe as a whole. the "lensing" or the bending of light from distant galaxies. 26. We can see only a certain distance out into the universe, a ...
... the typical sizes of brighter structures in the cosmic microwave background. the ratio of the average density of matter to that of radiation energy in the universe as a whole. the "lensing" or the bending of light from distant galaxies. 26. We can see only a certain distance out into the universe, a ...
Planisphere
... On a clear, dark night, it is possible to see M31 with the naked eye. However, even on such a night, it will appear very faint, so you will need to use nearby stars in order to find its location. Imagine it is 8pm on Feb. 6th. Starting from the Great Square of Pegasus and using a technique called “s ...
... On a clear, dark night, it is possible to see M31 with the naked eye. However, even on such a night, it will appear very faint, so you will need to use nearby stars in order to find its location. Imagine it is 8pm on Feb. 6th. Starting from the Great Square of Pegasus and using a technique called “s ...
The star is moving away from earth
... By measuring the red-shifts of the most distant galaxies, it is possible to calculate the a. b. c. d. ...
... By measuring the red-shifts of the most distant galaxies, it is possible to calculate the a. b. c. d. ...
The Hertzsprung-Russell Diagram
... you know the stars are all at the same distance. Then apparent brightness vs spectral type is basically the same as luminosity vs temperature. They found that stars only appear in certain parts of the diagram. ...
... you know the stars are all at the same distance. Then apparent brightness vs spectral type is basically the same as luminosity vs temperature. They found that stars only appear in certain parts of the diagram. ...
Lecture 17, PPT version
... black hole) Now often called a “hypernova” (more energy than a typical high-mass star supernova) Newly formed black hole in core sucks in some of mass surrounding core during few seconds while star explodes ...
... black hole) Now often called a “hypernova” (more energy than a typical high-mass star supernova) Newly formed black hole in core sucks in some of mass surrounding core during few seconds while star explodes ...
Star G has an apparent magnitude of +5.0 and an absolute
... • The regions producing light in emission nebulae are optically thick • The dust grains in reflection nebulae scatter longer wavelengths of visible light better than ...
... • The regions producing light in emission nebulae are optically thick • The dust grains in reflection nebulae scatter longer wavelengths of visible light better than ...
Weighing a galaxy / Black holes / Quasars —16 Nov Nov-09
... speed is greater than speed of light: nothing can escape. • If sun were squeezed to 3-km radius, light could not escape from it. • If Earth were squeezed to 1-cm radius, light could not escape from it. • Schwarzschild radius is boundary between inside & outside of a black hole. – Light can escape if ...
... speed is greater than speed of light: nothing can escape. • If sun were squeezed to 3-km radius, light could not escape from it. • If Earth were squeezed to 1-cm radius, light could not escape from it. • Schwarzschild radius is boundary between inside & outside of a black hole. – Light can escape if ...
Main Sequence Stars
... • Spheres of water have several properties: mass, volume, radius, surface area … • We can make a “Vogt-Russell” theorem for balls of water that says that all of the other properties of a ball of water are determined by just the mass and even write down equations, i.e. volume = mass/(density of water ...
... • Spheres of water have several properties: mass, volume, radius, surface area … • We can make a “Vogt-Russell” theorem for balls of water that says that all of the other properties of a ball of water are determined by just the mass and even write down equations, i.e. volume = mass/(density of water ...
Section 1
... A model atmosphere is a numerical simulation of a real stellar atmosphere, typically presented as the run of physical parameters (such as temperature) as a function of depth; here ‘depth’ generally refers to optical depth (§3.4), measured inwards. Observationally, the most easily accessible part of ...
... A model atmosphere is a numerical simulation of a real stellar atmosphere, typically presented as the run of physical parameters (such as temperature) as a function of depth; here ‘depth’ generally refers to optical depth (§3.4), measured inwards. Observationally, the most easily accessible part of ...
Due: January 14, 2014 Name: White dwarfs are “has been
... b. The star is slowly shrinking, thereby releasing gravitational potential energy. c. The star is generating energy by helium fusion in its core, having stopped hydrogen "burning." d. The star has ceased nuclear "burning" and is simply cooling down by emitting radiation. ...
... b. The star is slowly shrinking, thereby releasing gravitational potential energy. c. The star is generating energy by helium fusion in its core, having stopped hydrogen "burning." d. The star has ceased nuclear "burning" and is simply cooling down by emitting radiation. ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.