cifutielu`s Astronomy Test 2014
... Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of the Sun’s mass. 3. _____ Giants/supergiants whose periods range from 20 to 2000 days. 4. _ ...
... Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of the Sun’s mass. 3. _____ Giants/supergiants whose periods range from 20 to 2000 days. 4. _ ...
Name Date Life and Death of a Star 2015 1. In the main
... 22. If the force of fusion in the star decreases, then gravity will now dominate hydrostatic equilibrium. This results in an unstable star. What should happen next? A. The core of the star will contract B. the gas presure will puff off the outer layers ofthe star to form a nebula C. the core of the ...
... 22. If the force of fusion in the star decreases, then gravity will now dominate hydrostatic equilibrium. This results in an unstable star. What should happen next? A. The core of the star will contract B. the gas presure will puff off the outer layers ofthe star to form a nebula C. the core of the ...
1. What is the HR diagram? 1a. The HR diagram is a plot of a star`s
... 1a. The HR diagram is a plot of a star’s luminosity on the vertical axis against the star’s temperature on the horizontal axis. 2. What is a stellar evolutionary track? 2a. A stellar evolutionary track is a plot of the values of luminosity and temperature that a star has at different times in its li ...
... 1a. The HR diagram is a plot of a star’s luminosity on the vertical axis against the star’s temperature on the horizontal axis. 2. What is a stellar evolutionary track? 2a. A stellar evolutionary track is a plot of the values of luminosity and temperature that a star has at different times in its li ...
Stellar Winds and Mass Loss
... on the order of 10-6M/yr Most notable is Hα Also, Paschen and Brackett lines of He II Wolf-Rayet stars are dominated by lines that form in high density winds ...
... on the order of 10-6M/yr Most notable is Hα Also, Paschen and Brackett lines of He II Wolf-Rayet stars are dominated by lines that form in high density winds ...
A minimum column density of 1gcm(
... stellar content below 15M[, whereas competitive accretion would allow up to 42M[ of low-mass stars. However, because radiation does not halt fragmentation until some low-mass stars have formed, we do expect most massive stars to form surrounded by a cluster. Environmental variation at the top end of ...
... stellar content below 15M[, whereas competitive accretion would allow up to 42M[ of low-mass stars. However, because radiation does not halt fragmentation until some low-mass stars have formed, we do expect most massive stars to form surrounded by a cluster. Environmental variation at the top end of ...
Star Formation in Lynds Dark Nebulae
... beginning of time (Yan, 05). Dust found in molecular clouds is crucial to the star formation process, as it allows gas to condense into pre-stellar cores and evolve into YSOs, or young stellar objects (Greene, 01). Research by Carballo (1992) identified new candidate YSOs in Scorpio-Centaurus Lupus, ...
... beginning of time (Yan, 05). Dust found in molecular clouds is crucial to the star formation process, as it allows gas to condense into pre-stellar cores and evolve into YSOs, or young stellar objects (Greene, 01). Research by Carballo (1992) identified new candidate YSOs in Scorpio-Centaurus Lupus, ...
Star Cycle Balloons - Communicating Astronomy With The Public
... This activity demonstrates the life cycle of stars using balloons to represent the different types of stars. This activity represents the different spectral types with different color balloons. Procedure 1. Give each group a set of cards and the supplies necessary to complete the activity according ...
... This activity demonstrates the life cycle of stars using balloons to represent the different types of stars. This activity represents the different spectral types with different color balloons. Procedure 1. Give each group a set of cards and the supplies necessary to complete the activity according ...
Supernovae Gamma-Ray Bursts and and some of their uses
... layers of the star • The star may collapse directly into a black hole: these are called hypernovae or collapsars • Hypernova may or may not produce a supernova explosion, it can emit jets of gamma rays • Mergers of neutron stars should occur occassionally but not enough to produce the number of GRBs ...
... layers of the star • The star may collapse directly into a black hole: these are called hypernovae or collapsars • Hypernova may or may not produce a supernova explosion, it can emit jets of gamma rays • Mergers of neutron stars should occur occassionally but not enough to produce the number of GRBs ...
Life Cycle of Stars Activity
... This activity demonstrates the life cycle of stars using balloons to represent the different types of stars. This activity represents the different spectral types with different color balloons. Procedure 1. Give each group a set of cards and the supplies necessary to complete the activity according ...
... This activity demonstrates the life cycle of stars using balloons to represent the different types of stars. This activity represents the different spectral types with different color balloons. Procedure 1. Give each group a set of cards and the supplies necessary to complete the activity according ...
Lecture 10
... shock cannot “leave” the core. Once shock does propagates outwards (perhaps using n heating) it: ...
... shock cannot “leave” the core. Once shock does propagates outwards (perhaps using n heating) it: ...
Astrophysics - Mr Priest`s Physics Notes
... Infrared astronomers study parts of the infrared spectrum, which consists of electromagnetic waves with wavelengths ranging from just longer than visible light to 1,000 times longer than visible light. Earth’s atmosphere absorbs infrared radiation, so astronomers must collect infrared radiation from ...
... Infrared astronomers study parts of the infrared spectrum, which consists of electromagnetic waves with wavelengths ranging from just longer than visible light to 1,000 times longer than visible light. Earth’s atmosphere absorbs infrared radiation, so astronomers must collect infrared radiation from ...
Extraordinary Gamma-Ray Burst
... and variability seen, the outward-directed beam from Swift 1644+57 must point virtually straight at Earth. Other astronomical objects have shown somewhat similar bursts of radiation at X-ray, ultraviolet, and optical wavelengths. These have led researchers to believe they too were witnessing the tid ...
... and variability seen, the outward-directed beam from Swift 1644+57 must point virtually straight at Earth. Other astronomical objects have shown somewhat similar bursts of radiation at X-ray, ultraviolet, and optical wavelengths. These have led researchers to believe they too were witnessing the tid ...
Lecture 2. Isolated Neutron Stars – I.
... They were neutron stars in close binary systems, BUT ... .... they were «not recognized».... Now we know hundreds of X-ray binaries with neutron stars in the Milky Way and in other galaxies. ...
... They were neutron stars in close binary systems, BUT ... .... they were «not recognized».... Now we know hundreds of X-ray binaries with neutron stars in the Milky Way and in other galaxies. ...
Astrophysics
... number and proper unit. c. (1 pt) The system is losing energy, say by gravitational radiation. This will cause the small body to spiral in and eventually collide with the neutron star. What is the orbital period of the system when the small body is orbiting just at the surface of the NS? (Ignore rel ...
... number and proper unit. c. (1 pt) The system is losing energy, say by gravitational radiation. This will cause the small body to spiral in and eventually collide with the neutron star. What is the orbital period of the system when the small body is orbiting just at the surface of the NS? (Ignore rel ...
The Formation of High Mass Stars
... High mass protostars have outflows that look like larger versions of low mass protostellar outflows (Beuther et al. 2004) ...
... High mass protostars have outflows that look like larger versions of low mass protostellar outflows (Beuther et al. 2004) ...
All_Stars
... How do pulsars work? The “lighthouse” model attempts to explains why pulsars: • rotate rapidly • have intense magnetic fields • emit beams of radiation that spew from their magnetic poles ...
... How do pulsars work? The “lighthouse” model attempts to explains why pulsars: • rotate rapidly • have intense magnetic fields • emit beams of radiation that spew from their magnetic poles ...
1 - People Server at UNCW
... (9 pts) Answer the following: a. ________________ assigned the original magnitude range for stars. b. The binding energy of deuterium is ________________. c. After studying the Coma cluster, ________________ introduced the idea of dark matter. d. The Cepheids were first classified by _______________ ...
... (9 pts) Answer the following: a. ________________ assigned the original magnitude range for stars. b. The binding energy of deuterium is ________________. c. After studying the Coma cluster, ________________ introduced the idea of dark matter. d. The Cepheids were first classified by _______________ ...
Powerpoint Presentation (large file)
... neutron stars produce novae and bursters • Material from an ordinary star in a close binary can fall onto the surface of the companion white dwarf or neutron star to produce a surface layer in which thermonuclear reactions can explosively ignite • Explosive hydrogen fusion may occur in the surface l ...
... neutron stars produce novae and bursters • Material from an ordinary star in a close binary can fall onto the surface of the companion white dwarf or neutron star to produce a surface layer in which thermonuclear reactions can explosively ignite • Explosive hydrogen fusion may occur in the surface l ...
Discover - Astronomy Magazine
... gravitational waves, these undulations are so tiny that one passing through Earth would jostle us by far less than the diameter of a proton. Over time, however, the outgoing gravitational waves would deplete a binary system’s energy, causing the objects to spiral in toward each other. Over a 30-year ...
... gravitational waves, these undulations are so tiny that one passing through Earth would jostle us by far less than the diameter of a proton. Over time, however, the outgoing gravitational waves would deplete a binary system’s energy, causing the objects to spiral in toward each other. Over a 30-year ...
Astronomy 122 mid Term Exam
... Here is an example that got ½ credit – again even though it’s not even close to correct: “You determine the age by looking at the stars around it. Since they are in a stellar cluster they are the same age. The age of the star is 2 times the age of the Sun.” Or “The most massive star still on the mai ...
... Here is an example that got ½ credit – again even though it’s not even close to correct: “You determine the age by looking at the stars around it. Since they are in a stellar cluster they are the same age. The age of the star is 2 times the age of the Sun.” Or “The most massive star still on the mai ...
FIRST LIGHT IN THE UNIVERSE
... What would they look like? • Partridge & Peebles (1967, Ap J 147, 868): free-fall collapse - 700 L* systems at z~10-30, large diffuse & red, possible L • Meier (1976, Ap J 207, 343): compact stellar systems, possibly QSOs • Tinsley (1980, Ap J 241, 41): MS brightening goes as dM/dt 1.3-0.3x leadin ...
... What would they look like? • Partridge & Peebles (1967, Ap J 147, 868): free-fall collapse - 700 L* systems at z~10-30, large diffuse & red, possible L • Meier (1976, Ap J 207, 343): compact stellar systems, possibly QSOs • Tinsley (1980, Ap J 241, 41): MS brightening goes as dM/dt 1.3-0.3x leadin ...
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.