PHYS3380_111615_bw - The University of Texas at Dallas
... Initial rotation period uncertain, but lets say similar to typical white dwarfs (e.g. 40Eri B has PWD=1350s). Hence PNS ~ 4 ms Magnetic field strengths in white dwarfs typically measured at B=5x108 Gauss, hence BNS~1014 Gauss (compare with B ~2 Gauss!) Similar luminosity to Sun, but mostly in X-ray ...
... Initial rotation period uncertain, but lets say similar to typical white dwarfs (e.g. 40Eri B has PWD=1350s). Hence PNS ~ 4 ms Magnetic field strengths in white dwarfs typically measured at B=5x108 Gauss, hence BNS~1014 Gauss (compare with B ~2 Gauss!) Similar luminosity to Sun, but mostly in X-ray ...
Introducing the black hole
... is believed that in this process, the core of a star, possibly a late giant, collapses from its original radius of a few thousand kilometers to a compact object with a radius of a few tens of kilometers. The core has slowly evolved over thousands of years to a degree where it is unstable against gra ...
... is believed that in this process, the core of a star, possibly a late giant, collapses from its original radius of a few thousand kilometers to a compact object with a radius of a few tens of kilometers. The core has slowly evolved over thousands of years to a degree where it is unstable against gra ...
Physics: Principle and Applications, 7e (Giancoli) Chapter 33
... B) red giant stars. C) regular stars like our sun. D) white dwarfs. Answer: A Var: 1 7) Black holes A) are gaps in space, containing no matter. B) are predicted by Einstein's special theory of relativity. C) are the collapsed remnant of giant stars. D) cannot be detected in binary star systems. E) a ...
... B) red giant stars. C) regular stars like our sun. D) white dwarfs. Answer: A Var: 1 7) Black holes A) are gaps in space, containing no matter. B) are predicted by Einstein's special theory of relativity. C) are the collapsed remnant of giant stars. D) cannot be detected in binary star systems. E) a ...
Prof. Kenney C lass 8 September 26, 2016
... There is no more heat generated to support core of star against weight of overlying material core collapses & star explodes in a Type II supernova outer layers of star violently ejected into space (carrying with it the elements heavier than He created during stellar evolution and the SN explosion) ...
... There is no more heat generated to support core of star against weight of overlying material core collapses & star explodes in a Type II supernova outer layers of star violently ejected into space (carrying with it the elements heavier than He created during stellar evolution and the SN explosion) ...
Snímek 1 - Physics.cz
... Paczynski Modulation, C < 1 4. General Implications of Paczynski Modulation Mechanism (disc oscillation models): report on a work in progress ...
... Paczynski Modulation, C < 1 4. General Implications of Paczynski Modulation Mechanism (disc oscillation models): report on a work in progress ...
Chapter 6: Stellar Evolution (part 2)
... stars in binary systems is of about 1.4M . A neutron star has a radius of ∼ 10 km, depending on the assumed exact equation of state, an issue of still much interest. The density is ∼ 3 × 1014 g cm−3 , comparable to the nuclear matter ...
... stars in binary systems is of about 1.4M . A neutron star has a radius of ∼ 10 km, depending on the assumed exact equation of state, an issue of still much interest. The density is ∼ 3 × 1014 g cm−3 , comparable to the nuclear matter ...
What keeps stars shining? What holds them up? Lecture 14. The
... "perfect gas" it takes a higher core temperature to maintain the same pressure. As core temperature rises, fusion rate rises, so luminosity increases somewhat. (This is very important for understanding origin of life on earth. Sun's luminosity has grown at least 50% since birth of Earth. Planetary s ...
... "perfect gas" it takes a higher core temperature to maintain the same pressure. As core temperature rises, fusion rate rises, so luminosity increases somewhat. (This is very important for understanding origin of life on earth. Sun's luminosity has grown at least 50% since birth of Earth. Planetary s ...
Counter-rotating Stellar Components in Simulated Disk Galaxies
... Prada et al (1996) found that the line-of-sight velocity distribution has two distinct peaks and can be decomposed into a fast-rotating component with v/σ ~ 3, and a slower rotating, retrograde component with v/σ ~1–1.5. The radial surface brightness profile of the counter-rotating component follows ...
... Prada et al (1996) found that the line-of-sight velocity distribution has two distinct peaks and can be decomposed into a fast-rotating component with v/σ ~ 3, and a slower rotating, retrograde component with v/σ ~1–1.5. The radial surface brightness profile of the counter-rotating component follows ...
Herbig Ae/Be Stars
... A reliable understanding of pre-main sequence evolution would reveal many details of star formation • What is the star formation history? + How long does star formation last? + Which stars form first? + What is the relation between young stars in adjacent ...
... A reliable understanding of pre-main sequence evolution would reveal many details of star formation • What is the star formation history? + How long does star formation last? + Which stars form first? + What is the relation between young stars in adjacent ...
Untitled - Notion Press
... stop the core collapsing. This collapsing gets to a point. The gravity at this point becomes such intense that not even light can escape from its gravitational force. This is a black hole. These stars of the mass of more than 8 to 20 times of solar mass end with a ‘supernova.’ The stars of these mas ...
... stop the core collapsing. This collapsing gets to a point. The gravity at this point becomes such intense that not even light can escape from its gravitational force. This is a black hole. These stars of the mass of more than 8 to 20 times of solar mass end with a ‘supernova.’ The stars of these mas ...
Luminosities and magnitudes of stars
... The solid angle, , that an object subtends at a point is a measure of how big that object appears to an observer at that point. For instance, a small object nearby could subtend the same solid angle as a large object far away. The solid angle is proportional to the surface area, S, of a projection ...
... The solid angle, , that an object subtends at a point is a measure of how big that object appears to an observer at that point. For instance, a small object nearby could subtend the same solid angle as a large object far away. The solid angle is proportional to the surface area, S, of a projection ...
Lecture 15 Star Formation and Evolution 3/7
... • test out model of stellar evolution using Star Clusters • HR diagram of a cluster gives “snapshot” of stars with the same age but different masses • Birth Main Sequence Red Giant “live+die” faster if higher mass • tell age of cluster by most massive star still on Main Sequence ...
... • test out model of stellar evolution using Star Clusters • HR diagram of a cluster gives “snapshot” of stars with the same age but different masses • Birth Main Sequence Red Giant “live+die” faster if higher mass • tell age of cluster by most massive star still on Main Sequence ...
Starspots (AIP – Klaus G
... Measuring Stellar Surface Magnetic Fields (AIP – Klaus G. Strassmeier, with Drs. T. Carroll, I. Ilyin) Magnetic fields likely play an important role in almost any astrophysical target, from the early Universe to the Sun, Earth, and its environment. While numerical 3-D MHD simulations became more an ...
... Measuring Stellar Surface Magnetic Fields (AIP – Klaus G. Strassmeier, with Drs. T. Carroll, I. Ilyin) Magnetic fields likely play an important role in almost any astrophysical target, from the early Universe to the Sun, Earth, and its environment. While numerical 3-D MHD simulations became more an ...
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman
... 5. Hydrogen exospheres around TRAPPIST-1b/c Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a ...
... 5. Hydrogen exospheres around TRAPPIST-1b/c Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a ...
15 May 2011 Gas Giants, (Rigel, Betelgeuse, Aldebaran etc
... As one can see, in the above table I discard the values presently published and present the values obtained with my theory (UDS). Note: the mass values given in the above table will be justified below through calculations of gravitational formulations. In the paper ruggeri8 is presented a formula (o ...
... As one can see, in the above table I discard the values presently published and present the values obtained with my theory (UDS). Note: the mass values given in the above table will be justified below through calculations of gravitational formulations. In the paper ruggeri8 is presented a formula (o ...
Grade Nine Planetarium script
... Merak and Debhe are the pointers in the big dipper (Dubhe is the closer to Polaris) Bellatrix is the right shoulder of Orion, while Saiph is the left knee Many stars have no names, just letter designations based on the constellation that they are in. Cygnus-X1 is a star about half-way along the neck ...
... Merak and Debhe are the pointers in the big dipper (Dubhe is the closer to Polaris) Bellatrix is the right shoulder of Orion, while Saiph is the left knee Many stars have no names, just letter designations based on the constellation that they are in. Cygnus-X1 is a star about half-way along the neck ...
astronomy - Scioly.org
... Accelerated fusion in H burning shell directly above core causes star to expand, causing outer layers of the star to cool and adopt the red color. -The red-giant-branch follows the main-sequence. Here, the core is comprised of helium. The initial contraction of the star is halted by electron degener ...
... Accelerated fusion in H burning shell directly above core causes star to expand, causing outer layers of the star to cool and adopt the red color. -The red-giant-branch follows the main-sequence. Here, the core is comprised of helium. The initial contraction of the star is halted by electron degener ...
ACTIVITIES for Grades 3-5 (Continued)
... years to reach them. Ask students: What types of information does light provide about celestial objects too far for us to ever reach in our lifetime? Answers may include: The color of the light that a celestial object emits tells us its temperature. The light given off at a specific frequency by an a ...
... years to reach them. Ask students: What types of information does light provide about celestial objects too far for us to ever reach in our lifetime? Answers may include: The color of the light that a celestial object emits tells us its temperature. The light given off at a specific frequency by an a ...
copyright 2002 scientific american, inc.
... the most extreme objects they knew of: black holes. Among the first GRBs pinpointed by BeppoSAX was GRB970508, so named because it occurred on May 8, 1997. Radio observations of its afterglow provided an essential clue. The glow varied erratically by roughly a factor of two during the first three we ...
... the most extreme objects they knew of: black holes. Among the first GRBs pinpointed by BeppoSAX was GRB970508, so named because it occurred on May 8, 1997. Radio observations of its afterglow provided an essential clue. The glow varied erratically by roughly a factor of two during the first three we ...
Gamma Ray Bursts
... The core of the hypernova collapses directly into a black hole and two extremely energetic jets of plasma are emitted from its rotational poles at nearly the speed of light. These jets emit intense gamma rays, and are a candidate explanation for gamma ray bursts. About 1 out of every 100 superno ...
... The core of the hypernova collapses directly into a black hole and two extremely energetic jets of plasma are emitted from its rotational poles at nearly the speed of light. These jets emit intense gamma rays, and are a candidate explanation for gamma ray bursts. About 1 out of every 100 superno ...
Exam #2 Solutions
... The cooler giant stars are mostly K and M giants with temperatures around 5,000 K to 3,000K and luminosities between 50 and 5,000 solar luminosities. The stars are all larger in radius than the Sun, being between 1 and 100 solar radii. All these stars will have very short lifetimes compared to ...
... The cooler giant stars are mostly K and M giants with temperatures around 5,000 K to 3,000K and luminosities between 50 and 5,000 solar luminosities. The stars are all larger in radius than the Sun, being between 1 and 100 solar radii. All these stars will have very short lifetimes compared to ...
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.