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The Universe at Your Fingertips • Astronomical Society of the Pacific
... small that its escape velocity equals light-speed, it becomes dark. This is what Laplace had in mind when he thought about 'black stars'. This idea was one of those idle speculations at the boundary of mathematics and science at the time, and nothing more was done with the idea for over 100 years. O ...
... small that its escape velocity equals light-speed, it becomes dark. This is what Laplace had in mind when he thought about 'black stars'. This idea was one of those idle speculations at the boundary of mathematics and science at the time, and nothing more was done with the idea for over 100 years. O ...
Star Formation in the Rosette Complex
... analyzed with multi-slit echelle spectroscopy in Hα, and these data revealed large systematic velocities of up to 20 km·s−1 at the cavity, a sign of rapid evacuation of material due to powerful stellar winds. A similar result was found by Smith (1973). The cluster itself has been the subject of many ...
... analyzed with multi-slit echelle spectroscopy in Hα, and these data revealed large systematic velocities of up to 20 km·s−1 at the cavity, a sign of rapid evacuation of material due to powerful stellar winds. A similar result was found by Smith (1973). The cluster itself has been the subject of many ...
Protostellar/PMS Mass Infall Luminosity Problem
... luminosity). Now that more massive protostars are included, the match with our PLF is much improved. ...
... luminosity). Now that more massive protostars are included, the match with our PLF is much improved. ...
SOFIA Engineering Meeting 12-May-2011
... – SOFIA is an observatory, not a mission – Given constraints of airplane, flight plans, etc., need to observe multiple p targets g each flight g to maximize relativelyy small observingg time (only 1000 hours per year in full opertations) Al working on sensitivity calculator for SOFIA with 1000K and ...
... – SOFIA is an observatory, not a mission – Given constraints of airplane, flight plans, etc., need to observe multiple p targets g each flight g to maximize relativelyy small observingg time (only 1000 hours per year in full opertations) Al working on sensitivity calculator for SOFIA with 1000K and ...
Magnetic fields in O-, B- and A-type stars on the main sequence
... 78 Virginis [2]. These two stars are representative of two major groups of magnetic stars, which are directly related to the dominant mechanism of heat transport in the outer layers of the stars. For the Sun and low-mass stars on the main sequence, the magnetic fields have complex surface structures ...
... 78 Virginis [2]. These two stars are representative of two major groups of magnetic stars, which are directly related to the dominant mechanism of heat transport in the outer layers of the stars. For the Sun and low-mass stars on the main sequence, the magnetic fields have complex surface structures ...
Space, Earth and Celestial Objects Test Prep
... (3) larger, hotter, and less luminous (4) larger, cooler, and more luminous Astronomers viewing light from distant galaxies observe a shift of spectral lines toward the red end of the visible spectrum. This shift provides evidence that (1) orbital velocities of stars are decreasing (2) Earth’s atmos ...
... (3) larger, hotter, and less luminous (4) larger, cooler, and more luminous Astronomers viewing light from distant galaxies observe a shift of spectral lines toward the red end of the visible spectrum. This shift provides evidence that (1) orbital velocities of stars are decreasing (2) Earth’s atmos ...
Galaxies
... • Astronomers now have decided that the morphology classification should consist of only two types of galaxies: the spiral and the elliptical. • Barred spirals are a subclass of spirals. Irregulars may be either spiral or barred spiral. ...
... • Astronomers now have decided that the morphology classification should consist of only two types of galaxies: the spiral and the elliptical. • Barred spirals are a subclass of spirals. Irregulars may be either spiral or barred spiral. ...
1. The Birth of a Star
... thousands of men and women worldwide now study space in detail and entire government agencies such as the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA) are devoted to space science. These men and women have invented powerful telescopes, and have launched hu ...
... thousands of men and women worldwide now study space in detail and entire government agencies such as the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA) are devoted to space science. These men and women have invented powerful telescopes, and have launched hu ...
Science Quarter 3 Lessons
... The motion of an object can change by speeding up, slowing down or changing direction. Forces cause changes in motion. If a force is applied in the same direction of an object's motion, the speed will increase. If a force is applied in the opposite direction of an object's motion, the speed will dec ...
... The motion of an object can change by speeding up, slowing down or changing direction. Forces cause changes in motion. If a force is applied in the same direction of an object's motion, the speed will increase. If a force is applied in the opposite direction of an object's motion, the speed will dec ...
Article PDF - IOPscience
... M31. They span distances in the range of ∼45 arcmin (G76) to ∼4 deg (B514) from the center of M31, thus allowing us to probe different areas of Andromeda, from the galaxy’s unperturbed halo to regions close to the giant stream. We are aware that these few clusters may not necessarily be representati ...
... M31. They span distances in the range of ∼45 arcmin (G76) to ∼4 deg (B514) from the center of M31, thus allowing us to probe different areas of Andromeda, from the galaxy’s unperturbed halo to regions close to the giant stream. We are aware that these few clusters may not necessarily be representati ...
Photometry`s bright future: Detecting Solar System analogues with
... tions are radial-velocity measurements (Haywood et al. 2014), different wavelengths (Evans et al. 2015), or instrumental systematics such as the drift in the roll-angle of Kepler’s K2 mission (Aigrain et al. 2015; ForemanMackey et al. 2015). When the noise timescale gets closer to the transit durati ...
... tions are radial-velocity measurements (Haywood et al. 2014), different wavelengths (Evans et al. 2015), or instrumental systematics such as the drift in the roll-angle of Kepler’s K2 mission (Aigrain et al. 2015; ForemanMackey et al. 2015). When the noise timescale gets closer to the transit durati ...
The Classification of Galaxies By Daniel Underwood Contents The
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
RPT-O-G0047 Gemini Telescopes f/16 Optical
... Chopping. "Chopping" is the procedure of tip-tilting the secondary mirror in a repetitive pattern to provide an image location shift for infrared background cancellation. Conic Constant ("K"). K = -e , where e equals the eccentricity of any conic section. Emissivity, Telescope. The "Telescope emissi ...
... Chopping. "Chopping" is the procedure of tip-tilting the secondary mirror in a repetitive pattern to provide an image location shift for infrared background cancellation. Conic Constant ("K"). K = -e , where e equals the eccentricity of any conic section. Emissivity, Telescope. The "Telescope emissi ...
Gamma Ray Burst Afterglows and Host Galaxies
... Probable Sequence of GRB Events • The central engine emits a large amount of energy (in almost any form). • Most of that energy accelerates a small mass (about the mass of the Earth) to speeds > 99.99% of lightspeed. • Collisions between different shells of ejected debris creates the gamma rays. ...
... Probable Sequence of GRB Events • The central engine emits a large amount of energy (in almost any form). • Most of that energy accelerates a small mass (about the mass of the Earth) to speeds > 99.99% of lightspeed. • Collisions between different shells of ejected debris creates the gamma rays. ...
Carbon-enhanced metal-poor stars in dwarf galaxies
... [Fe/H]≤ −3 have been observed, and 10 of them are found to be CEMP-no stars. This gives FCEMP (< −3) ≈ 42%. However, when we consider individual dwarf galaxies, the fractions are highly variable. The carbon measurements in the least luminous ultra-faint dwarf galaxies, log(L/L# ) < 4.0 (shown in Fig ...
... [Fe/H]≤ −3 have been observed, and 10 of them are found to be CEMP-no stars. This gives FCEMP (< −3) ≈ 42%. However, when we consider individual dwarf galaxies, the fractions are highly variable. The carbon measurements in the least luminous ultra-faint dwarf galaxies, log(L/L# ) < 4.0 (shown in Fig ...
How We See The Sky
... Diffraction places a limit on the resolution of an optical system. As detail becomes smaller, diffraction has a proportionally stronger “smearing” effect (failure to fully “transfer” scene contrast), diminishing the ability of the optical system to resolve fine detail. High MTF at low contrast level ...
... Diffraction places a limit on the resolution of an optical system. As detail becomes smaller, diffraction has a proportionally stronger “smearing” effect (failure to fully “transfer” scene contrast), diminishing the ability of the optical system to resolve fine detail. High MTF at low contrast level ...
Process of Science: PreMainSequence Stellar Life Tracks on the HR
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
Stars: Stellar Evol & “death” Galaxies Astronomy 1 — Elementary Astronomy
... A. It would inevitably get sucked into the black hole with no possibility of escape. B. It would detect the gravitational pull of the black hole and be able to go into orbit around it. C. It would be unable to locate the black hole because it’s, well, black. D. It would be repelled by the black hole ...
... A. It would inevitably get sucked into the black hole with no possibility of escape. B. It would detect the gravitational pull of the black hole and be able to go into orbit around it. C. It would be unable to locate the black hole because it’s, well, black. D. It would be repelled by the black hole ...
Radiative winds, accretion disks and massive stars physics using
... • Ions which provide the radiative acceleration constitute about only 10-5 of all ions by number (since H and He contribute negligibly to the acceleration since fully ionized) so if a typical ion increases its velocity by 20cm/s, the effective increase per absorption is 2x10-3 cm/s. To accelerate th ...
... • Ions which provide the radiative acceleration constitute about only 10-5 of all ions by number (since H and He contribute negligibly to the acceleration since fully ionized) so if a typical ion increases its velocity by 20cm/s, the effective increase per absorption is 2x10-3 cm/s. To accelerate th ...
Astronomy 250 - University of Victoria
... A difficult task in astronomy is to determine the distances to various astronomical targets. For nearby objects, simple geometric methods can be used to find fairly accurate distances. Annual Parallax The first efforts by the Greeks to measure stellar distances were largely frustrated by inaccurate ...
... A difficult task in astronomy is to determine the distances to various astronomical targets. For nearby objects, simple geometric methods can be used to find fairly accurate distances. Annual Parallax The first efforts by the Greeks to measure stellar distances were largely frustrated by inaccurate ...
IRAM Annual Report 2011
... green light for the first and most important phase of the NOEMA project with the related financial support. With these decisions the IRAM associates have laid out a solid basis for the future of IRAM and the role it will play while ALMA starts operation. All throughout 2011 the IRAM users, with the ...
... green light for the first and most important phase of the NOEMA project with the related financial support. With these decisions the IRAM associates have laid out a solid basis for the future of IRAM and the role it will play while ALMA starts operation. All throughout 2011 the IRAM users, with the ...
Looking Through a Telescope with an Obsidian Mirror
... Corresponding author: Michael A. Rappenglück ([email protected]) ...
... Corresponding author: Michael A. Rappenglück ([email protected]) ...
NEW DESIGN AND NEW CHALLENGE FOR SPACE LARGE
... and cyanate resin. Based on this concept a 2 meter mirror has been designed, Fig. 11, and finely analyzed by finite elements models. Such mirror has an area mass of only 17 Kg/m2. Mirror ISM has been fixed on the rear side inside reinforcements of the Zerodur® back skin and fixed at 2/3 of the diame ...
... and cyanate resin. Based on this concept a 2 meter mirror has been designed, Fig. 11, and finely analyzed by finite elements models. Such mirror has an area mass of only 17 Kg/m2. Mirror ISM has been fixed on the rear side inside reinforcements of the Zerodur® back skin and fixed at 2/3 of the diame ...
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.