Stellar Evolution II
... • A core with remaining mass of 1.4 to 3 M, composed of tightly packed neutrons. • These tiny stars are much smaller than planet Earth -- in fact, they are about the diameter of a large city (~20 km). • One cubic centimeter (like a sugar cube) of a neutron star, would have a mass of about 1011 kg! ...
... • A core with remaining mass of 1.4 to 3 M, composed of tightly packed neutrons. • These tiny stars are much smaller than planet Earth -- in fact, they are about the diameter of a large city (~20 km). • One cubic centimeter (like a sugar cube) of a neutron star, would have a mass of about 1011 kg! ...
here - Lund Observatory
... magnitudes and intrinsic colour indices. The interstellar reddening of the two binary components is assumed to be the same. The two cluster stars are imbedded in clouds of interstellar matter. The distance to the stars C and D is assumed to be the same. The extinction coefficient for interstellar ma ...
... magnitudes and intrinsic colour indices. The interstellar reddening of the two binary components is assumed to be the same. The two cluster stars are imbedded in clouds of interstellar matter. The distance to the stars C and D is assumed to be the same. The extinction coefficient for interstellar ma ...
Name - MIT
... E) It is the next telescope that will be launched into space. 24) Which is not a reason why all large modern telescopes tend to be reflectors? A) It is much easier to make a high-quality mirror than the same quality lens B) Large mirrors are much lighter than large lenses C) Lenses focus different w ...
... E) It is the next telescope that will be launched into space. 24) Which is not a reason why all large modern telescopes tend to be reflectors? A) It is much easier to make a high-quality mirror than the same quality lens B) Large mirrors are much lighter than large lenses C) Lenses focus different w ...
a2Lec115
... Units of Distance: Use mks system: length=meter, mass =kgm, time=sec Astronomical Unit (AU): Distance from the earth to the sun = semi-major axis of the orbit of Earth around Sun 1 AU = d(sun) = 1.5 x 1011 m Parsec (PC): Distance at which 1 AU subtends Angle of 1 second 1 pc (parsec) = 206625 AU = ...
... Units of Distance: Use mks system: length=meter, mass =kgm, time=sec Astronomical Unit (AU): Distance from the earth to the sun = semi-major axis of the orbit of Earth around Sun 1 AU = d(sun) = 1.5 x 1011 m Parsec (PC): Distance at which 1 AU subtends Angle of 1 second 1 pc (parsec) = 206625 AU = ...
Supernovae - 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 ...
HR-Diagram
... This time there is so much energy because of the large mass of the outer star that the collapse causes a Super Nova Explosion. NOW…if the CORE of the star has a mass of 3x or less the size of the sun ( but has a much smaller diameter than the sun) it creates a Neutron Star which spins and emits a st ...
... This time there is so much energy because of the large mass of the outer star that the collapse causes a Super Nova Explosion. NOW…if the CORE of the star has a mass of 3x or less the size of the sun ( but has a much smaller diameter than the sun) it creates a Neutron Star which spins and emits a st ...
Death of Massive Stars
... 1. Speed of light is a constant and nothing can travel faster Speed of light = 300,000 km/s (180,000 miles/s) 2. The faster something moves, the slower time appears to move for it -For every second that passes on Earth, 0.99999999967 seconds pass on the international space station (orbiting at about ...
... 1. Speed of light is a constant and nothing can travel faster Speed of light = 300,000 km/s (180,000 miles/s) 2. The faster something moves, the slower time appears to move for it -For every second that passes on Earth, 0.99999999967 seconds pass on the international space station (orbiting at about ...
Stars
... low density outer envelope completely off the star. • As it expands, its opacity drops and we see to a deeper and deeper and hotter and hotter depth, so the star moves left on the HR diagram • Until… we see the electron degenerate core; the new white dwarf created at the center • This core can now c ...
... low density outer envelope completely off the star. • As it expands, its opacity drops and we see to a deeper and deeper and hotter and hotter depth, so the star moves left on the HR diagram • Until… we see the electron degenerate core; the new white dwarf created at the center • This core can now c ...
Stellar structure
... automatically determined once M is given. The steady-state, homogeneous composition model that we have constructed is meaningful only for timescales shorter than the nuclear evolution timescale of the star. For example, when the star switches from p-p chain to helium burning both its composition and ...
... automatically determined once M is given. The steady-state, homogeneous composition model that we have constructed is meaningful only for timescales shorter than the nuclear evolution timescale of the star. For example, when the star switches from p-p chain to helium burning both its composition and ...
A Chandra Observation of the Massive Star-Forming
... XLFs constructed from hard band luminosities and total luminosities the ACIS-I FOV compared to those (449) detected in X-ray (uncorrected for absorption) compared with Orion XLF from COUP Three color composite MSX image of NGC 6357. Central cavity and bright nebulosities are clearly seen. ...
... XLFs constructed from hard band luminosities and total luminosities the ACIS-I FOV compared to those (449) detected in X-ray (uncorrected for absorption) compared with Orion XLF from COUP Three color composite MSX image of NGC 6357. Central cavity and bright nebulosities are clearly seen. ...
Unit 1
... • Photons traveling away from a massive object will experience a gravitational redshift. – Their frequency will be shifted toward the red end of the ...
... • Photons traveling away from a massive object will experience a gravitational redshift. – Their frequency will be shifted toward the red end of the ...
LETG Spring, 2015
... atmosphere. At shorter wavelengths, we need to appeal to petulant, harder X-ray sources, none of which can be described by models of absolute flux, and all of which have a tendency to vary well beyond the percent precision level on the several hour timescales it takes us to observe them to acquire s ...
... atmosphere. At shorter wavelengths, we need to appeal to petulant, harder X-ray sources, none of which can be described by models of absolute flux, and all of which have a tendency to vary well beyond the percent precision level on the several hour timescales it takes us to observe them to acquire s ...
Exam Study Guide
... 27. The Messier List was generated by an astronomer who was interested in studying what kind of object? 28. Altitude and Azimuth are useful because … 29. Celestial coordinates (RA and Dec) are useful because … 30. Find the star whose coordinates are RA=4h35m and Dec=16°. ❆ 31. What is zodiacal light ...
... 27. The Messier List was generated by an astronomer who was interested in studying what kind of object? 28. Altitude and Azimuth are useful because … 29. Celestial coordinates (RA and Dec) are useful because … 30. Find the star whose coordinates are RA=4h35m and Dec=16°. ❆ 31. What is zodiacal light ...
ppt - SLAC
... Unified picture of active galaxies • Presumably all AGN have the same basic ingredients: a black ...
... Unified picture of active galaxies • Presumably all AGN have the same basic ingredients: a black ...
Life Cycle of a Star - Intervention Worksheet
... A dying red super giant star can suddenly explode. The explosion is called a supernova. After the star explodes, some of the materials from the star are left behind. This material may form a neutron star. Neutron stars are the remains of high-mass stars. The most massive stars become black holes whe ...
... A dying red super giant star can suddenly explode. The explosion is called a supernova. After the star explodes, some of the materials from the star are left behind. This material may form a neutron star. Neutron stars are the remains of high-mass stars. The most massive stars become black holes whe ...
V Example: our SUN (G2V)
... Modified in part from http://astronomyonline.org/Stars/HighMassEvolution.asp A white dwarf is the degenerate carbon core of a low mass star (like our Sun). A neutron star is the degenerate iron core of a high mass star. A pulsar is spinning neutron star. A black hole is the remnant of the collapse o ...
... Modified in part from http://astronomyonline.org/Stars/HighMassEvolution.asp A white dwarf is the degenerate carbon core of a low mass star (like our Sun). A neutron star is the degenerate iron core of a high mass star. A pulsar is spinning neutron star. A black hole is the remnant of the collapse o ...
Brightness vs. Distance
... The POWER of the source Definition: the total amount of energy emitted by the source per second. For a star this is called “LUMINOSITY”. The unit of Energy: JOULE. The unit of Power: WATT = 1 joule/sec ...
... The POWER of the source Definition: the total amount of energy emitted by the source per second. For a star this is called “LUMINOSITY”. The unit of Energy: JOULE. The unit of Power: WATT = 1 joule/sec ...
(as Main Sequence Stars)?
... Mass of end products is less than mass of 4 protons by 0.7%. Mass converted to energy. 600 millions of tons per second fused. Takes billions of years to convert p's to 4He in Sun's core. Process sets lifetime of stars. Hydrostatic Equilibrium: pressure from fusion reactions balances gravity. Sun is ...
... Mass of end products is less than mass of 4 protons by 0.7%. Mass converted to energy. 600 millions of tons per second fused. Takes billions of years to convert p's to 4He in Sun's core. Process sets lifetime of stars. Hydrostatic Equilibrium: pressure from fusion reactions balances gravity. Sun is ...
SpfFin - Academic Program Pages
... 13. What produces the rapid rotation rate of a young neutron star, or pulsar? The core of the dying star spins up because it collapses to a very small radius. Matter falling onto the neutron star from the debris of the supernova explosion causes the neutron star to spin up. Mass transfer from a com ...
... 13. What produces the rapid rotation rate of a young neutron star, or pulsar? The core of the dying star spins up because it collapses to a very small radius. Matter falling onto the neutron star from the debris of the supernova explosion causes the neutron star to spin up. Mass transfer from a com ...
14-1 Reading Questions: Neutron Stars
... 1. A neutron star, containing a little more than _________ solar mass, compressed to a radius of about __________, can be left as a remnant after a type ______ supernova explosion. A neutron star’s density is so high that physicists calculate that this material is stable only as a __________________ ...
... 1. A neutron star, containing a little more than _________ solar mass, compressed to a radius of about __________, can be left as a remnant after a type ______ supernova explosion. A neutron star’s density is so high that physicists calculate that this material is stable only as a __________________ ...
PowerPoint Presentation - ASTR498E High energy
... The area under consideration must be oriented face-on to lineof-sight to the star In principle, this definition works for any kind of energy emitted by the star… most commonly, we mean e/m radiation Sometimes, it is useful to consider the observed flux in a restricted range of e/m wavelengths (e.g., ...
... The area under consideration must be oriented face-on to lineof-sight to the star In principle, this definition works for any kind of energy emitted by the star… most commonly, we mean e/m radiation Sometimes, it is useful to consider the observed flux in a restricted range of e/m wavelengths (e.g., ...
Luminosity
... • Luminosity=intrinsic brightness =total energy emitted • Diameter and Mass • And to define a typical star ...
... • Luminosity=intrinsic brightness =total energy emitted • Diameter and Mass • And to define a typical star ...
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.