The Most Massive LMC Star Sk
... R 136 a, might be a star of mass formed together. The fainter components (c-f) are probably early-type 0 250-1,000 MG' Cassinelli et al. (1981) stars, as the formation of low mass stars from the IUE data concluded that R 136 a is a single supermassive star of needs a longer time scale. This may be a ...
... R 136 a, might be a star of mass formed together. The fainter components (c-f) are probably early-type 0 250-1,000 MG' Cassinelli et al. (1981) stars, as the formation of low mass stars from the IUE data concluded that R 136 a is a single supermassive star of needs a longer time scale. This may be a ...
Ch. 17 (RGs & WDs)
... imaged directly, size must be calculated knowing the luminosity and temperature: ...
... imaged directly, size must be calculated knowing the luminosity and temperature: ...
UvA-DARE (Digital Academic Repository)
... mayy implode further to form a black hole. AA large fraction of stars are in binaries, as may have been our exploding, massive star. If thee total mass lost in the supernova explosion is not too large with respect to the total mass off the system, it remains bound and a binary neutron star is born, ...
... mayy implode further to form a black hole. AA large fraction of stars are in binaries, as may have been our exploding, massive star. If thee total mass lost in the supernova explosion is not too large with respect to the total mass off the system, it remains bound and a binary neutron star is born, ...
Deep O/IR Survey Of Chandra Galactic Bulge Fields
... analysis suggest that a large subset of the sources are intrinsically hard, and reasonably described by a power law with photon index =0. The typical luminosities of these objects are in the range 10 3133 erg/s. The largest well studied class of objects fitting this description are high magnetic fie ...
... analysis suggest that a large subset of the sources are intrinsically hard, and reasonably described by a power law with photon index =0. The typical luminosities of these objects are in the range 10 3133 erg/s. The largest well studied class of objects fitting this description are high magnetic fie ...
powerpoint file - QUB Astrophysics Research Centre
... central part of the curve (corresponding to close to a solar mass) is approximated by a power law, it has an exponent of approximately 5. Which is in good agreement with the value of 5.46 above. Similarly the lower part of the main-sequence on the observed L-Te diagram (HR diagram) is well represent ...
... central part of the curve (corresponding to close to a solar mass) is approximated by a power law, it has an exponent of approximately 5. Which is in good agreement with the value of 5.46 above. Similarly the lower part of the main-sequence on the observed L-Te diagram (HR diagram) is well represent ...
Today`s Powerpoint
... curve => "dark" matter! Dark matter must be about 90% of the mass! Composition unknown. Probably mostly exotic particles that don't interact with ordinary matter at all (except gravity). ...
... curve => "dark" matter! Dark matter must be about 90% of the mass! Composition unknown. Probably mostly exotic particles that don't interact with ordinary matter at all (except gravity). ...
Yes - Wichita State University
... •Measure the oxygen gradient in the ISM of the Milky Way disk •Employ planetary nebulae as abundance probes •Perform detailed statistical treatment of data ...
... •Measure the oxygen gradient in the ISM of the Milky Way disk •Employ planetary nebulae as abundance probes •Perform detailed statistical treatment of data ...
Our Galaxy, The Milky Way
... Pop. I: young stars in the (thin) disk, open clusters Pop. II: old stars in the bulge, halo, and globular clusters – Today, we distinguish between the old, metal-rich stars in the bulge, and old, metal-poor stars in the halo – Not clear whether the Pop. I is homogeneous: young thin disk, vs. interme ...
... Pop. I: young stars in the (thin) disk, open clusters Pop. II: old stars in the bulge, halo, and globular clusters – Today, we distinguish between the old, metal-rich stars in the bulge, and old, metal-poor stars in the halo – Not clear whether the Pop. I is homogeneous: young thin disk, vs. interme ...
Project 3: Astronomy Lesson
... then collapse in back on itself with so much force and pressure that gravity will never take hold, and the star will continue to collapse forever, creating a black hole ...
... then collapse in back on itself with so much force and pressure that gravity will never take hold, and the star will continue to collapse forever, creating a black hole ...
Is Protostellar Jet Spinning? Chin
... is estimated to be ~ 30 yrs. This periodic variation may be due to a solar-type magnetic cycle or a periodic disturbance of an unseen stellar companion orbiting the protostar at ~ 4 AU away with a period of 30 yrs. The averaged two-sided mass-loss rate of the jet is estimated to be (1-3) x10-6 M⊙ yr ...
... is estimated to be ~ 30 yrs. This periodic variation may be due to a solar-type magnetic cycle or a periodic disturbance of an unseen stellar companion orbiting the protostar at ~ 4 AU away with a period of 30 yrs. The averaged two-sided mass-loss rate of the jet is estimated to be (1-3) x10-6 M⊙ yr ...
The Death of a Star
... about 50 km in radius. The amount of energy released is equal to the Sun’s luminosity for ten’s of billions of years. The remaining outer layers are blown away by the explosion. The leftover is a neutron star. ...
... about 50 km in radius. The amount of energy released is equal to the Sun’s luminosity for ten’s of billions of years. The remaining outer layers are blown away by the explosion. The leftover is a neutron star. ...
Interstellar Medium and Star Formation
... Revealed large scale field of galaxy Radio polarization of synchrotron shows field in external galaxies as well At high extinctions (high densities), IR emission polarization fails to trace field ...
... Revealed large scale field of galaxy Radio polarization of synchrotron shows field in external galaxies as well At high extinctions (high densities), IR emission polarization fails to trace field ...
2009_ASU_Exam
... a) What is the name of this object? b) What type of variability does this object exhibit? c) Which image shows a close-up of the surface of this object? d) Which image shows a light curve that represents the eventual catastrophic collapse of this object? e) This object is 1400 light-years from Earth ...
... a) What is the name of this object? b) What type of variability does this object exhibit? c) Which image shows a close-up of the surface of this object? d) Which image shows a light curve that represents the eventual catastrophic collapse of this object? e) This object is 1400 light-years from Earth ...
L7 - QUB Astrophysics Research Centre
... interactions between the elements and photons of different frequencies. This requires an enormous amount of calculation and is beyond the scope of this course. When it has been done, the results are usually approximated by the ...
... interactions between the elements and photons of different frequencies. This requires an enormous amount of calculation and is beyond the scope of this course. When it has been done, the results are usually approximated by the ...
The correct answers are written in bold, italic and underlined. The
... Cosmic rays are made up primarily of atomic nuclei that travel through space after being accelerated to very high speeds and energies, often by processes associated with supernovae. 5. What is believed to be the origin of most of the cosmic rays arriving at the Earth from outside the solar system? • ...
... Cosmic rays are made up primarily of atomic nuclei that travel through space after being accelerated to very high speeds and energies, often by processes associated with supernovae. 5. What is believed to be the origin of most of the cosmic rays arriving at the Earth from outside the solar system? • ...
Document
... provides a good fit to the distribution of GCS stars in the age-metallicity plane although this plane was not used in the fitting process. Although this model's starformation rate is monotonic declining, its disc naturally splits into an alphaenhanced thick disc and a normal thin disc. In particular ...
... provides a good fit to the distribution of GCS stars in the age-metallicity plane although this plane was not used in the fitting process. Although this model's starformation rate is monotonic declining, its disc naturally splits into an alphaenhanced thick disc and a normal thin disc. In particular ...
Lecture 25&26
... Now believe that AGN are indeed accreting supermassive black holes Matter can’t fall straight in… forms an accretion disk. Accretion disks power jets. ...
... Now believe that AGN are indeed accreting supermassive black holes Matter can’t fall straight in… forms an accretion disk. Accretion disks power jets. ...
ppt - IASF Milano
... •There are very few constraints on groups scale (1013 ≤ M ≤ 1014 Msun) , where numerical predictions are more accurate because a large number of halo can be simulated. ...
... •There are very few constraints on groups scale (1013 ≤ M ≤ 1014 Msun) , where numerical predictions are more accurate because a large number of halo can be simulated. ...
Star and Planet Formation - Homepages of UvA/FNWI staff
... 1. If the Earth rotates around the Sun, birds should actually stay behind because of the movement of the Earth on its orbit. 2. If the Earth rotates around its axis (as required to explain day and night), things should fly off the spinning planet. 3. If the Earth rotates around the Sun, we should ob ...
... 1. If the Earth rotates around the Sun, birds should actually stay behind because of the movement of the Earth on its orbit. 2. If the Earth rotates around its axis (as required to explain day and night), things should fly off the spinning planet. 3. If the Earth rotates around the Sun, we should ob ...
Molecular gas in z~6 quasar host galaxies
... degree are required for most of the sources • However, the obscured fraction is probably ≤50% for the very luminous quasars: large torus opening angle at high luminosity (Simpson 2005; Treister et al. 2008) inclination angle range of about 0 to 60 degree. • An average inclination angle of 40 degree ...
... degree are required for most of the sources • However, the obscured fraction is probably ≤50% for the very luminous quasars: large torus opening angle at high luminosity (Simpson 2005; Treister et al. 2008) inclination angle range of about 0 to 60 degree. • An average inclination angle of 40 degree ...
Radiation from Proxima Centauri
... Radiation from Proxima Centauri. The closest star to the Solar System is known as Proxima Centauri. Its distance has been accurately measured as 4.243 light years [4.01 1016 m]. The strength of the radiation at different wavelengths has been studied by satellites orbiting the Earth and the spectru ...
... Radiation from Proxima Centauri. The closest star to the Solar System is known as Proxima Centauri. Its distance has been accurately measured as 4.243 light years [4.01 1016 m]. The strength of the radiation at different wavelengths has been studied by satellites orbiting the Earth and the spectru ...
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.