Detection of Planetary Transits Across a Sun
... with the one we observe, then the likelihood that they too will generate transits is substantially enhanced relative to that for a randomly oriented system. The radial velocity data of M00 do not suggest other massive objects in this system. However, less massive objects (similar to Uranus, for inst ...
... with the one we observe, then the likelihood that they too will generate transits is substantially enhanced relative to that for a randomly oriented system. The radial velocity data of M00 do not suggest other massive objects in this system. However, less massive objects (similar to Uranus, for inst ...
Lecture Eight (Powerpoint format) - Flash
... It is important to realize that these magnitude ratings reflect the apparent brightness of a star. Two stars of the same intrinsic brightness at two different distances will have two different magnitudes. If one also knows the distance to the star (not always the case!), then one can correct for ...
... It is important to realize that these magnitude ratings reflect the apparent brightness of a star. Two stars of the same intrinsic brightness at two different distances will have two different magnitudes. If one also knows the distance to the star (not always the case!), then one can correct for ...
AY2 - Overview of the Universe
... B) The composition of most stars (mostly hydrogen and helium) is about the same as the composition of our bodies. C) Nearly every atom from which we are made once (before the solar system formed) was inside of a star. D) Sagan thought that all of us have the potential to be movie (or TV) stars like ...
... B) The composition of most stars (mostly hydrogen and helium) is about the same as the composition of our bodies. C) Nearly every atom from which we are made once (before the solar system formed) was inside of a star. D) Sagan thought that all of us have the potential to be movie (or TV) stars like ...
File - We All Love Science
... – Stars smaller than 0.1 are very rare. Why? – These low mass stars are very dim and are called “Brown Dwarf” stars due to their dim red light ...
... – Stars smaller than 0.1 are very rare. Why? – These low mass stars are very dim and are called “Brown Dwarf” stars due to their dim red light ...
GUM31 Y ALREDEDORES
... The HI gas emission distribution reveals an HI shell associated with RCW 78, which can be interpreted as an HI bubble linked to the ionized ring nebula. CO observations show the presence of molecular gas related to the nebula with velocities similar to those of the HI and HII material. The same ...
... The HI gas emission distribution reveals an HI shell associated with RCW 78, which can be interpreted as an HI bubble linked to the ionized ring nebula. CO observations show the presence of molecular gas related to the nebula with velocities similar to those of the HI and HII material. The same ...
Physical properties of Hα selected star forming galaxies at z ~ 0.84
... overall extinction correction AV = 1 mag obtained from the CFRS sample, except for two galaxies where high quality spectra were available and f (Hβ) and f (Hδ) could be measured. [1] did not attempt the extinction correction though we can apply the typical correction A(Hα) = 1 mag [2] for these kind ...
... overall extinction correction AV = 1 mag obtained from the CFRS sample, except for two galaxies where high quality spectra were available and f (Hβ) and f (Hδ) could be measured. [1] did not attempt the extinction correction though we can apply the typical correction A(Hα) = 1 mag [2] for these kind ...
Document
... Blazars at very high energies Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAS ...
... Blazars at very high energies Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAS ...
AGN jets
... Blazars at very high energies Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAS ...
... Blazars at very high energies Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAS ...
Slides from the talk
... even more compact objects! Fermi pressure of neutrons and/or quark matter??? balances gravity. For a typical neutron star ...
... even more compact objects! Fermi pressure of neutrons and/or quark matter??? balances gravity. For a typical neutron star ...
DETECTION OF PLANETARY TRANSITS ACROSS A SUN
... a deeper transit in V and B due to greater limb darkening at these shorter wavelengths. If there are other planets in the HD 209458 system, and if their orbits are approximately coplanar with the one we observe, then the likelihood that they too will generate transits is substantially enhanced relat ...
... a deeper transit in V and B due to greater limb darkening at these shorter wavelengths. If there are other planets in the HD 209458 system, and if their orbits are approximately coplanar with the one we observe, then the likelihood that they too will generate transits is substantially enhanced relat ...
SUPERMASSIVE BLACK HOLES
... The rotating speed of supermassive black holes and the rotating speed of the AGN are the same. This leads to the mature formation of galactic centers in host galaxies to supermassive black holes. The presence of a supermassive black hole influences the galaxy to take on a spheroidal shape (elliptic ...
... The rotating speed of supermassive black holes and the rotating speed of the AGN are the same. This leads to the mature formation of galactic centers in host galaxies to supermassive black holes. The presence of a supermassive black hole influences the galaxy to take on a spheroidal shape (elliptic ...
Sporadic Mass Ejection in Red Supergiants
... r?tation are preferably ejected from the atmosphere, smce they more easily attain velocities comparable to the escape speed of the star than do elements moving in the opposite direction. Accordingly, mass expulsion occurs preferentially in an equatorial plane in the forward direction of rotation. In ...
... r?tation are preferably ejected from the atmosphere, smce they more easily attain velocities comparable to the escape speed of the star than do elements moving in the opposite direction. Accordingly, mass expulsion occurs preferentially in an equatorial plane in the forward direction of rotation. In ...
Black Holes PowerPoint
... • An unusual property of rotating black holes – The Penrose process • Objects skipping off the ergoregion can steal momentum ...
... • An unusual property of rotating black holes – The Penrose process • Objects skipping off the ergoregion can steal momentum ...
L45 DETECTION OF PLANETARY TRANSITS ACROSS A SUN
... a deeper transit in V and B due to greater limb darkening at these shorter wavelengths. If there are other planets in the HD 209458 system, and if their orbits are approximately coplanar with the one we observe, then the likelihood that they too will generate transits is substantially enhanced relat ...
... a deeper transit in V and B due to greater limb darkening at these shorter wavelengths. If there are other planets in the HD 209458 system, and if their orbits are approximately coplanar with the one we observe, then the likelihood that they too will generate transits is substantially enhanced relat ...
here - Atomki
... - Astrometry → distance - Eclipsing binaries → mass ratios, orbital info - Occultations & interferometry → angular diameter, R - Seismology → interior structure: c s, ρ, ... ...
... - Astrometry → distance - Eclipsing binaries → mass ratios, orbital info - Occultations & interferometry → angular diameter, R - Seismology → interior structure: c s, ρ, ... ...
The Milky Way - TCNJ | The College of New Jersey
... orbits of some nearby RGs very fast; those further away are slower; X-rays consistent with weak emission from accretion ...
... orbits of some nearby RGs very fast; those further away are slower; X-rays consistent with weak emission from accretion ...
Chapter 13
... Supernova Remnants • The huge, glowing cloud of debris that expands from a supernova explosion sweeping up interstellar material as it goes is called a supernova remnant – During a 1-100 year time frame, a supernova will expand from 0.03 ly to several light-years in diameter – Supernova remnants ha ...
... Supernova Remnants • The huge, glowing cloud of debris that expands from a supernova explosion sweeping up interstellar material as it goes is called a supernova remnant – During a 1-100 year time frame, a supernova will expand from 0.03 ly to several light-years in diameter – Supernova remnants ha ...
Lec11_ch13_blackholes
... collapse, a region around the star is created with a gravitational field so strong that nothing, not even electromagnetic radiation (light, radio waves, x-rays, etc) can escape – spacetime curvature is so strong that all paths lead toward the singularity--a black hole has formed! ...
... collapse, a region around the star is created with a gravitational field so strong that nothing, not even electromagnetic radiation (light, radio waves, x-rays, etc) can escape – spacetime curvature is so strong that all paths lead toward the singularity--a black hole has formed! ...
Lecture 21
... zone becomes more transparent, absorbs less energy => weight from higher layers pushes it back inward. => Contraction. Upon compression, partial He ionization zone becomes more opaque again, absorbs more energy than needed for equilibrium => Expansion ...
... zone becomes more transparent, absorbs less energy => weight from higher layers pushes it back inward. => Contraction. Upon compression, partial He ionization zone becomes more opaque again, absorbs more energy than needed for equilibrium => Expansion ...
http://www.lanl.gov/orgs/adtsc/publications/science_highlights_2013/docs/Pg24_25.pdf
... the progenitor stars from all of these observations is limited because for most of these SNe we have only lightcurve data, while for some we have spectra as well. Even in the extremely rare cases where the progenitor stars of nearby SNe can be identified on pre-explosion images[2], this only gives a ...
... the progenitor stars from all of these observations is limited because for most of these SNe we have only lightcurve data, while for some we have spectra as well. Even in the extremely rare cases where the progenitor stars of nearby SNe can be identified on pre-explosion images[2], this only gives a ...
29-4 - Fremont Peak Observatory
... astronomer J. R. Hind first observed the star in 1845. Hind reported that the star appeared “like a drop of blood on a black field.” R Lep varies in apparent magnitude from +5.5 to around +11.7 with a period of approximately 427 days. There is also a potential secondary period of approximately 40 ye ...
... astronomer J. R. Hind first observed the star in 1845. Hind reported that the star appeared “like a drop of blood on a black field.” R Lep varies in apparent magnitude from +5.5 to around +11.7 with a period of approximately 427 days. There is also a potential secondary period of approximately 40 ye ...
BLACK HOLES - Science Center of Iowa
... generally predictable ways because of the gravitational attraction between the stars. Scientists knew that if they saw a single star moving as if there were a massive object nearby, but with no other star in evidence, then its invisible companion could be a black hole. Scientists also realized that ...
... generally predictable ways because of the gravitational attraction between the stars. Scientists knew that if they saw a single star moving as if there were a massive object nearby, but with no other star in evidence, then its invisible companion could be a black hole. Scientists also realized that ...
Astronomy Assignment #1
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
Supernovae and compact objects
... February 23, 1987 three neutrino detectors on Earth detected a burst of neutrinos: the Kamiokande II detector in Japan, the Irvine-Michigan-Brookhaven detector in the US, and the Baksan detector in Russia. The neutrinos arrived more than three hours before the first detection of visible light from t ...
... February 23, 1987 three neutrino detectors on Earth detected a burst of neutrinos: the Kamiokande II detector in Japan, the Irvine-Michigan-Brookhaven detector in the US, and the Baksan detector in Russia. The neutrinos arrived more than three hours before the first detection of visible light from t ...
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.