Problem set 3 solution
... The derivation in the text assumes that the smaller star is hotter, i.e. that the primary eclipse is when the smaller star passes behind the larger. Can we back this up with the data? Assuming this is true, then in the primary eclipse we see only the larger star, which gives 100(m0 −mp )/5 = 100(5.4 ...
... The derivation in the text assumes that the smaller star is hotter, i.e. that the primary eclipse is when the smaller star passes behind the larger. Can we back this up with the data? Assuming this is true, then in the primary eclipse we see only the larger star, which gives 100(m0 −mp )/5 = 100(5.4 ...
AST 341 - Homework IV - Solutions
... Explain your conclusion in part c in terms of physical process of convection and radiation. ...
... Explain your conclusion in part c in terms of physical process of convection and radiation. ...
Practice Questions for Final
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
Lecture19
... Nebula is still expanding, at ~1450 km/s The source of the luminosity and electrons is a pulsar in the centre of the nebula. ...
... Nebula is still expanding, at ~1450 km/s The source of the luminosity and electrons is a pulsar in the centre of the nebula. ...
L = σAT 4
... An electron in a higher state than the ground state is called an excited electron. ...
... An electron in a higher state than the ground state is called an excited electron. ...
The Size and Structure of the Milky Way Galaxy
... Dark Matter: A Major Problem for Contemporary Physics and Astronomy • Stars are a small fraction of the mass of major galaxies • The dark matter problem becomes more pronounced as you go out in the universe • The form of the dark matter is unknown; probably not what you studied in chemistry • Possi ...
... Dark Matter: A Major Problem for Contemporary Physics and Astronomy • Stars are a small fraction of the mass of major galaxies • The dark matter problem becomes more pronounced as you go out in the universe • The form of the dark matter is unknown; probably not what you studied in chemistry • Possi ...
PPT file
... If the mass stays the same, the protostar may shrink and never reach full star status. ...
... If the mass stays the same, the protostar may shrink and never reach full star status. ...
BrainPOP - The Science Spot
... 1. Stars change during their lifetime, which can be _______________ of years long. They start out as diffuse clouds of _______ and _________ drifting through space. __________ pulls the clouds together causing clumps to form. If the clump is large enough, the __________ caused by gravity inside a __ ...
... 1. Stars change during their lifetime, which can be _______________ of years long. They start out as diffuse clouds of _______ and _________ drifting through space. __________ pulls the clouds together causing clumps to form. If the clump is large enough, the __________ caused by gravity inside a __ ...
Stellar Structure - McMurry University
... The size of a black hole’s event horizon is related to its mass: R = (3 km) M (in solar masses) So a 20 solar mass black hole has a Schwarzschild Radius of 60 km. As a black hole eats, it gets bigger! ...
... The size of a black hole’s event horizon is related to its mass: R = (3 km) M (in solar masses) So a 20 solar mass black hole has a Schwarzschild Radius of 60 km. As a black hole eats, it gets bigger! ...
Star formation - Grosse Pointe Public School System
... • Some protostars are not massive enough to ever begin nuclear fusion, since they will never achieve high enough temperatures and pressures in their cores. • These “wanna-be” stars still glow red from light generated due to gravitational contraction. They are known as brown dwarfs, but aren’t really ...
... • Some protostars are not massive enough to ever begin nuclear fusion, since they will never achieve high enough temperatures and pressures in their cores. • These “wanna-be” stars still glow red from light generated due to gravitational contraction. They are known as brown dwarfs, but aren’t really ...
Astronomy.Practice.Quiz3
... 12. What determines the final stages of a star’s life cycle? a. size b. color c. temperature ...
... 12. What determines the final stages of a star’s life cycle? a. size b. color c. temperature ...
Stellar Parallax Problems
... 6. A. The European Space Agency sent an exact copy of the Gaia mission to orbit Saturn and take parallax measurements, what would be the largest distance to a star that the Gaia spacecraft could measure from that orbit? ...
... 6. A. The European Space Agency sent an exact copy of the Gaia mission to orbit Saturn and take parallax measurements, what would be the largest distance to a star that the Gaia spacecraft could measure from that orbit? ...
Quiz 1 Review
... They are so massive they can bend the fabric of spacetime so much that they may be able to stretch to other parallel universes. 30.How do we see black holes? Gravitational lensing ...
... They are so massive they can bend the fabric of spacetime so much that they may be able to stretch to other parallel universes. 30.How do we see black holes? Gravitational lensing ...
Stellar Forces
... electrons) is very inefficient as electrons collide often with other particles. However, ...
... electrons) is very inefficient as electrons collide often with other particles. However, ...
ppt - Astronomy & Physics
... protons, and this mass is converted into energy, which powers the Sun (and other stars) ...
... protons, and this mass is converted into energy, which powers the Sun (and other stars) ...
main sequence
... gravitationally bound to each other. They orbit around a common point, called the center of mass. It is estimated that about half of all the stars in our galaxy are part of a binary system. ...
... gravitationally bound to each other. They orbit around a common point, called the center of mass. It is estimated that about half of all the stars in our galaxy are part of a binary system. ...
chap17_s05_probs
... Given a star with an apparent magnitude of 10.0, and an absolute magnitude of 2.5, you are asked to find the distance to the star. ANSWER: Stars appear fainter if located further away, just like any luminous object. The magnitude of a star represents its brightness, either its perceived brightness, ...
... Given a star with an apparent magnitude of 10.0, and an absolute magnitude of 2.5, you are asked to find the distance to the star. ANSWER: Stars appear fainter if located further away, just like any luminous object. The magnitude of a star represents its brightness, either its perceived brightness, ...
chap17_f04_probs
... Given a star with an apparent magnitude of 10.0, and an absolute magnitude of 2.5, you are asked to find the distance to the star. ANSWER: Stars appear fainter if located further away, just like any luminous object. The magnitude of a star represents its brightness, either its perceived brightness, ...
... Given a star with an apparent magnitude of 10.0, and an absolute magnitude of 2.5, you are asked to find the distance to the star. ANSWER: Stars appear fainter if located further away, just like any luminous object. The magnitude of a star represents its brightness, either its perceived brightness, ...
Compact stars
... Although compact stars may radiate, and thus cool off and lose energy, they do not depend on high temperatures to maintain their pressure. Barring external perturbation or baryon decay, they will persist virtually forever, although black holes are generally believed to finally evaporate from Hawking ...
... Although compact stars may radiate, and thus cool off and lose energy, they do not depend on high temperatures to maintain their pressure. Barring external perturbation or baryon decay, they will persist virtually forever, although black holes are generally believed to finally evaporate from Hawking ...
Lecture 26
... may form after supernovae explosions of massive stars • How could it form? • Very likely started as a stellar-mass black hole and then grew via acretion of other material (stars, gas, and other black holes!) • Some objects just pass directly into the event horizon and disappear • Others (especially ...
... may form after supernovae explosions of massive stars • How could it form? • Very likely started as a stellar-mass black hole and then grew via acretion of other material (stars, gas, and other black holes!) • Some objects just pass directly into the event horizon and disappear • Others (especially ...
STELLAR ATMOSPHERES
... • Astr 8600 Stellar Spectroscopy detailed look at the line spectra of stars (bound-bound transitions), applications Gray Chapters 11 – 18 ...
... • Astr 8600 Stellar Spectroscopy detailed look at the line spectra of stars (bound-bound transitions), applications Gray Chapters 11 – 18 ...
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.