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... the Adaptive optics facility, using four Laser- and one natural guide-stars to measure the turbulence, and correcting for it by deforming the adaptive secondary mirror of a Unit telescope in the Paranal observatory. The outstanding feature of GRAAL is the extremely wide field of view correction, ove ...
Astronomy 114 - Department of Astronomy
... Spectra of stars reveal temperature (1/2) Overall, stars have blackbody (thermal) spectra Relative strength of absorption lines is a sensitive probe of temperature ...
... Spectra of stars reveal temperature (1/2) Overall, stars have blackbody (thermal) spectra Relative strength of absorption lines is a sensitive probe of temperature ...
October 2013 - Skyscrapers, Inc.
... of perhaps several trillions of comets encompassing our solar system and extending up to 465 billion miles from the Sun. Comets are leftover material from the creation of the solar system 4.6 billion years ago. They are irregularly shaped objects, estimated to range in size from several hundred feet ...
... of perhaps several trillions of comets encompassing our solar system and extending up to 465 billion miles from the Sun. Comets are leftover material from the creation of the solar system 4.6 billion years ago. They are irregularly shaped objects, estimated to range in size from several hundred feet ...
Measurements of Neutron Star Masses
... Arecibo observation.We calculated the bestfit DM for each of the 16 bins individually, keeping other timing parameters fixed at the best-fit values (Table 3). We then investigate the DM versus orbital phase for each epoch, as plotted in Fig. 10. Although variations at individual epochs are somewhat ...
... Arecibo observation.We calculated the bestfit DM for each of the 16 bins individually, keeping other timing parameters fixed at the best-fit values (Table 3). We then investigate the DM versus orbital phase for each epoch, as plotted in Fig. 10. Although variations at individual epochs are somewhat ...
DUSTY CIRCUMSTELLAR DISKS B. Zuckerman
... for approximately 15 years, except for one star (β Pictoris), no one was able to image the distribution of dust particles around the Vega-like stars. Recently, there have been significant observational breakthroughs. From the ground, with sensitive detectors on large telescopes, images have been obt ...
... for approximately 15 years, except for one star (β Pictoris), no one was able to image the distribution of dust particles around the Vega-like stars. Recently, there have been significant observational breakthroughs. From the ground, with sensitive detectors on large telescopes, images have been obt ...
Part IV: Stars
... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
History - Astrophysical Research Consortium
... Theodor Jacobsen, the sole UW astronomer since 1928. As observers used to access to excellent telescopes, Hodge and Wallerstein soon began to plan for an observatory and that first year hired Ed Mannery to help with site selection and optics design. They quickly realized, though, they needed a bette ...
... Theodor Jacobsen, the sole UW astronomer since 1928. As observers used to access to excellent telescopes, Hodge and Wallerstein soon began to plan for an observatory and that first year hired Ed Mannery to help with site selection and optics design. They quickly realized, though, they needed a bette ...
Lecture 12: Evolution of the Galaxy
... Lecture 12 • The Galaxy is presumed to have started from a huge extended low density cloud of H and He • This underwent rapid gravitational collapse over ~2 × 108 years (halo era) during which time the Population II stars were formed, all with low metallicity • As collapse proceeded, gas and dust cl ...
... Lecture 12 • The Galaxy is presumed to have started from a huge extended low density cloud of H and He • This underwent rapid gravitational collapse over ~2 × 108 years (halo era) during which time the Population II stars were formed, all with low metallicity • As collapse proceeded, gas and dust cl ...
English version - Richard de Grijs
... “The tails seem to tell us why that is,” said Posselt, adding that the pulsars’ spin and magnetic axis orientations influence what kind of emission is seen on Earth. Geminga may have magnetic poles quite close to the top and bottom of the object, and nearly aligned spin poles, much like Earth. On ...
... “The tails seem to tell us why that is,” said Posselt, adding that the pulsars’ spin and magnetic axis orientations influence what kind of emission is seen on Earth. Geminga may have magnetic poles quite close to the top and bottom of the object, and nearly aligned spin poles, much like Earth. On ...
SUB-KILOPARSEC IMAGING OF COOL MOLECULAR GAS IN
... conducted by the South Pole Telsecope (SPT; Carlstrom et al. 2011; Vieira et al. 2010; Mocanu et al. 2013) and Herschel (Negrello et al. 2010; Wardlow et al. 2013) have discovered large numbers of lensed DSFGs. Subsequent spectroscopy and high-resolution imaging have confirmed that the large majorit ...
... conducted by the South Pole Telsecope (SPT; Carlstrom et al. 2011; Vieira et al. 2010; Mocanu et al. 2013) and Herschel (Negrello et al. 2010; Wardlow et al. 2013) have discovered large numbers of lensed DSFGs. Subsequent spectroscopy and high-resolution imaging have confirmed that the large majorit ...
Interactive 4 - Hertzsprung-Russell Diagram Explorer
... Chandra X-Ray Observatory, NASA, United States http://chandra.harvard.edu/edu/formal/stellar_ev/s tellar_ev_flash.html This interactive shows the various stellar evolutions of stars based on their masses. It outlines what is occurring at each stage with a real example for each stage collected by the ...
... Chandra X-Ray Observatory, NASA, United States http://chandra.harvard.edu/edu/formal/stellar_ev/s tellar_ev_flash.html This interactive shows the various stellar evolutions of stars based on their masses. It outlines what is occurring at each stage with a real example for each stage collected by the ...
Direct Imaging of Exoplanets - American Museum of Natural History
... thermal inversions in two gas giant planets. Transits will also be valuable for determining mass and orbit statistics of distant planets, but its geometric bias precludes using it for the vast majority of nearby systems. Ultimately, exoplanet science will require direct images and spectra of exoplan ...
... thermal inversions in two gas giant planets. Transits will also be valuable for determining mass and orbit statistics of distant planets, but its geometric bias precludes using it for the vast majority of nearby systems. Ultimately, exoplanet science will require direct images and spectra of exoplan ...
Galactic Chemical Evolution and the Oxygen Isotopic Composition
... (IMA), which assumes that the ISM consists of a single homogeneous reservoir. The IMA cannot be absolutely correct; winds from AGB stars and SN ejecta are hot and tenuous compared to molecular clouds and will not mix efficiently; and SNe drive bubbles and “galactic fountains” that eject hot gas into ...
... (IMA), which assumes that the ISM consists of a single homogeneous reservoir. The IMA cannot be absolutely correct; winds from AGB stars and SN ejecta are hot and tenuous compared to molecular clouds and will not mix efficiently; and SNe drive bubbles and “galactic fountains” that eject hot gas into ...
MASSIVE CLOSE BINARIES
... trivial to understand that Case A components have smaller final masses whereas it is obvious that Case C (and non-interacting) binaries are similar to single stars. Equation 1 decides upon the mass loss during the RSG phase. The top-figure holds for the WR rates predicted by Equation 2 whereas the b ...
... trivial to understand that Case A components have smaller final masses whereas it is obvious that Case C (and non-interacting) binaries are similar to single stars. Equation 1 decides upon the mass loss during the RSG phase. The top-figure holds for the WR rates predicted by Equation 2 whereas the b ...
Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... We used the high-resolution IR-spectrograph CRIRES (Käufl et al. 2004) mounted on the 8.2 m Antu telescope of ESO’s Very Large Telescope on Cerro Paranal observatory to observe nine cool main-sequence dwarfs of the solar neighbourhood. The resolving power of the spectra was R ∼ 50 000 and the exposu ...
... We used the high-resolution IR-spectrograph CRIRES (Käufl et al. 2004) mounted on the 8.2 m Antu telescope of ESO’s Very Large Telescope on Cerro Paranal observatory to observe nine cool main-sequence dwarfs of the solar neighbourhood. The resolving power of the spectra was R ∼ 50 000 and the exposu ...
13.1 Galaxy Evolution: Introduction
... to know what is the initial mass function - the distribution of stars by mass when they're formed - because stars of different masses can evolve at very different pace. Then, for each stellar mass and and age we need a spectrum. So, we need libraries of stellar spectra that can b ...
... to know what is the initial mass function - the distribution of stars by mass when they're formed - because stars of different masses can evolve at very different pace. Then, for each stellar mass and and age we need a spectrum. So, we need libraries of stellar spectra that can b ...
Estimating the Age of Supernova Remnants - Chandra X
... most of the gas in the remnant is not from the star. As the ejected material expands outwards, it encounters and intermingles with the interstellar medium and propels it outward, building up the outer shock wave. The volume through which the remnant has expanded and the density of the interstellar m ...
... most of the gas in the remnant is not from the star. As the ejected material expands outwards, it encounters and intermingles with the interstellar medium and propels it outward, building up the outer shock wave. The volume through which the remnant has expanded and the density of the interstellar m ...
Sparse aperture masking at the VLT II. Detection limits for the eight
... Key words. instrumentation: high angular resolution – stars: planetary systems – planets and satellites: formation ...
... Key words. instrumentation: high angular resolution – stars: planetary systems – planets and satellites: formation ...
Hot Jupiters Provoke Their Own Host Suns to Wobble
... Auroras tonight? And possibly Saturday night? A coronal mass ejection from the Sun hit the Earth around 8 this morning Eastern Daylight Time (12:00 UT), and another arrived a few hours later. They were not as strong as expected, but their effects may continue for more than a day. See our article: Po ...
... Auroras tonight? And possibly Saturday night? A coronal mass ejection from the Sun hit the Earth around 8 this morning Eastern Daylight Time (12:00 UT), and another arrived a few hours later. They were not as strong as expected, but their effects may continue for more than a day. See our article: Po ...
Visible light laser guidestar experimental system (Villages): on
... than the smallest LGS spot reported so far (as to be expected from the improvement over seeing limited propagation). With such a small spot there is a potential for much greater efficiency in wavefront sensing. In particular, our recent simulations of a diffractive pyramid sensor have shown that bea ...
... than the smallest LGS spot reported so far (as to be expected from the improvement over seeing limited propagation). With such a small spot there is a potential for much greater efficiency in wavefront sensing. In particular, our recent simulations of a diffractive pyramid sensor have shown that bea ...
Galaxies
... • Once you have measured Hubble Law (using supernovas) then a measurement of the redshift gives you the distance • Use for determining distance to galaxies formed in early Universe even if they don’t have a supernova PHYS 162 Lecture 13a ...
... • Once you have measured Hubble Law (using supernovas) then a measurement of the redshift gives you the distance • Use for determining distance to galaxies formed in early Universe even if they don’t have a supernova PHYS 162 Lecture 13a ...
Minutes SSWG_10
... Draft: 28 April 2004 The tenth meeting of the SSWG took place on Sunday 26th October 2003, in the SALT Boardroom, Cape Town. Gerald Cecil kindly volunteered to take the minutes. Presentations given at the meeting can be downloaded from the SSWG website (www.salt.ac.za/content/science/restrict/restri ...
... Draft: 28 April 2004 The tenth meeting of the SSWG took place on Sunday 26th October 2003, in the SALT Boardroom, Cape Town. Gerald Cecil kindly volunteered to take the minutes. Presentations given at the meeting can be downloaded from the SSWG website (www.salt.ac.za/content/science/restrict/restri ...
Developments in Space Policies, Programmes and Technologies
... to 3 October 2014, India’s intention to expand its presence in the global launch market became more apparent. Representatives from Antrix announced that India’s PSLV had five slots available for commercial Earth observation and research customers, i.e. one in 2015, three in 2016, and one in 2017, to ...
... to 3 October 2014, India’s intention to expand its presence in the global launch market became more apparent. Representatives from Antrix announced that India’s PSLV had five slots available for commercial Earth observation and research customers, i.e. one in 2015, three in 2016, and one in 2017, to ...
In This Issue… The Milky Way above Kancamagus Highway
... affiliated with the Margaret and H.A. Rey Center and live in the area. While Al Larsson set up the Center’s Meade SCT, Joe used his 17.5” Newtonian, possibly the largest aperture seen at these events. It didn't get dark until well after 9:30pm, so we started with the planets and then moved on to dee ...
... affiliated with the Margaret and H.A. Rey Center and live in the area. While Al Larsson set up the Center’s Meade SCT, Joe used his 17.5” Newtonian, possibly the largest aperture seen at these events. It didn't get dark until well after 9:30pm, so we started with the planets and then moved on to dee ...
International Ultraviolet Explorer
![](https://en.wikipedia.org/wiki/Special:FilePath/International_Ultraviolet_Explorer.gif?width=300)
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.