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Lecture ppt - UCO/Lick Observatory
... • Different types of mirror have larger/smaller fitting error • Design of DMs balances stiffness and thickness of face sheet, stroke, strength of actuators, hysteresis, ability to polish mirror with high precision • Large DMs have been demonstrated (continuous face sheet, adaptive secondary) for ~ 1 ...
... • Different types of mirror have larger/smaller fitting error • Design of DMs balances stiffness and thickness of face sheet, stroke, strength of actuators, hysteresis, ability to polish mirror with high precision • Large DMs have been demonstrated (continuous face sheet, adaptive secondary) for ~ 1 ...
The Classification of Stellar Spectra
... The early spectral classification system was based on the appearance of the spectra, but the physical reason for these differences in spectra were not understood until the 1930’s and 1940’s. Then it was realized that, while there were some chemical differences among stars, the main thing that determ ...
... The early spectral classification system was based on the appearance of the spectra, but the physical reason for these differences in spectra were not understood until the 1930’s and 1940’s. Then it was realized that, while there were some chemical differences among stars, the main thing that determ ...
Stellar Evolution
... quickly on the main sequence and die explosively as supernovae. The shock sent out by such a supernova can excite further star formation. I. The Free-Fall Stage of Stellar Birth. 1. As a portion of a GMC begins to contract, cloud complexes with masses greater than ∼ 50 M become unstable and fragmen ...
... quickly on the main sequence and die explosively as supernovae. The shock sent out by such a supernova can excite further star formation. I. The Free-Fall Stage of Stellar Birth. 1. As a portion of a GMC begins to contract, cloud complexes with masses greater than ∼ 50 M become unstable and fragmen ...
Long-term monitoring of the short period SU UMa
... most acceptable model for SU UMa stars is the thermaltidal instability model developed by Osaki (1989), well reproducing the majority of observations. V844 Her was discovered by Antipin (1996) as a variable star near η Her. Antipin (1996) classified the variable, originally named Var 43 Her, as a dw ...
... most acceptable model for SU UMa stars is the thermaltidal instability model developed by Osaki (1989), well reproducing the majority of observations. V844 Her was discovered by Antipin (1996) as a variable star near η Her. Antipin (1996) classified the variable, originally named Var 43 Her, as a dw ...
Sky and Telescope - CAMS
... The new CAMS data show that at least 14 significant showers are active that week, each with its own particular radiant direction on the sky, velocity, duration (indicating stream width), and behavior. Five of these showers were completely new to me, even after spending many nights over the years on ...
... The new CAMS data show that at least 14 significant showers are active that week, each with its own particular radiant direction on the sky, velocity, duration (indicating stream width), and behavior. Five of these showers were completely new to me, even after spending many nights over the years on ...
669 - Caltech Optical Observatories
... The concept of mounting the NGAO narrow field deformable mirror (DM) on a tip-tilt mount to steer the light beam on the science instrument was proposed in KAON 558: “One can imagine steering the light beam on and around the science array with high accuracy using a steering mirror or a probe arm inst ...
... The concept of mounting the NGAO narrow field deformable mirror (DM) on a tip-tilt mount to steer the light beam on the science instrument was proposed in KAON 558: “One can imagine steering the light beam on and around the science array with high accuracy using a steering mirror or a probe arm inst ...
Outline Thesis – so far
... My thesis consists of two parts. In Part I, I describe my contributions to the laser guide star adaptive optics facility at the Large Binocular Telescope, the Advanced Rayleigh guided Ground layer adaptive Optics System , ARGOS. I investigate the effect of scattered light from propagating the laser ...
... My thesis consists of two parts. In Part I, I describe my contributions to the laser guide star adaptive optics facility at the Large Binocular Telescope, the Advanced Rayleigh guided Ground layer adaptive Optics System , ARGOS. I investigate the effect of scattered light from propagating the laser ...
Star formation and internal kinematics of irregular galaxies
... the picture that I will proceed with in this thesis; that star formation is a local process, with the same basic physics occuring in independent cells with dimensions between tens of parsecs and a couple of kiloparsecs. Thus a galaxy’s global structure and dynamics can be viewed as an organising fra ...
... the picture that I will proceed with in this thesis; that star formation is a local process, with the same basic physics occuring in independent cells with dimensions between tens of parsecs and a couple of kiloparsecs. Thus a galaxy’s global structure and dynamics can be viewed as an organising fra ...
3. Daylight Mapping
... pointing upward on the IR camera detector as displayed by the RTD. The direction of the East is retrieved accordingly. 4.4. Coordinates Scale The reference for the relative coordinates’ scale is the telescope offset pointing. All the other functions will base their scale w.r.t. telescope pointing of ...
... pointing upward on the IR camera detector as displayed by the RTD. The direction of the East is retrieved accordingly. 4.4. Coordinates Scale The reference for the relative coordinates’ scale is the telescope offset pointing. All the other functions will base their scale w.r.t. telescope pointing of ...
Document
... Why is adaptive optics needed? Turbulence in earth’s atmosphere makes stars twinkle More importantly, turbulence spreads out light; makes it a blob rather than a point ...
... Why is adaptive optics needed? Turbulence in earth’s atmosphere makes stars twinkle More importantly, turbulence spreads out light; makes it a blob rather than a point ...
classifying stars
... brighter to us on earth because they are much closer than others, astronomers call this apparent magnitude (HOW BRIGHT A STAR APPEARS.) However, if astronomers could take two stars and place them exactly the same distance from earth, they could tell which one really is brighter... unfortunately, thi ...
... brighter to us on earth because they are much closer than others, astronomers call this apparent magnitude (HOW BRIGHT A STAR APPEARS.) However, if astronomers could take two stars and place them exactly the same distance from earth, they could tell which one really is brighter... unfortunately, thi ...
Radial Velocity - Yale Exoplanet
... achieved the unprecedented precision of 15 m s−1 . Unfortunately, because of the small sample size, no planets were found. However, upper limits were set on M sin i for orbital periods out to 15 years for the 21 stars that they observed (Walker et al. 1995). Cross-correlation speedometers were also ...
... achieved the unprecedented precision of 15 m s−1 . Unfortunately, because of the small sample size, no planets were found. However, upper limits were set on M sin i for orbital periods out to 15 years for the 21 stars that they observed (Walker et al. 1995). Cross-correlation speedometers were also ...
OBSERVATIONS OF DISINTEGRATING, EVAPORATING AND HOT
... Hot Jupiters have been a big boon for exoplanet science because they enabled the early detection of planets outside the Solar System and the early detection of detailed atmospheric and orbital parameters to model and study comparatively. Our giant planets all take more than 11 years to orbit the Sun ...
... Hot Jupiters have been a big boon for exoplanet science because they enabled the early detection of planets outside the Solar System and the early detection of detailed atmospheric and orbital parameters to model and study comparatively. Our giant planets all take more than 11 years to orbit the Sun ...
Skyscraper How to Color the Universe by Kim Arcand the
... well placed for observers during the last week of March into the first week or so of April. In fact, the accompanying image was taken on April 1 from my backyard as I stood in 18-inches of fresh snow! While there have been many other comets since then, quite a few of them have been better observed f ...
... well placed for observers during the last week of March into the first week or so of April. In fact, the accompanying image was taken on April 1 from my backyard as I stood in 18-inches of fresh snow! While there have been many other comets since then, quite a few of them have been better observed f ...
PVPhotFlux
... ◦ calibration block during slew to target prior to AOR execution ◦ chopping between two CSs having different temperatures ◦ minimised or no down time for satellite – celestial flux standard ◦ point-source AOR on ε Car (5 repetitions, always visible, ~10 Jy) ◦ estimated time required: 0.5 h • Status: ...
... ◦ calibration block during slew to target prior to AOR execution ◦ chopping between two CSs having different temperatures ◦ minimised or no down time for satellite – celestial flux standard ◦ point-source AOR on ε Car (5 repetitions, always visible, ~10 Jy) ◦ estimated time required: 0.5 h • Status: ...
Shortв•`lived radioactivity in the early solar system: The Superв•`AGB
... Soni (2006) pollution of 26Al due to the winds of lowmass AGB stars (initial masses lower than approximately 1.5 Mx) and Wolf-Rayet stars (initial masses higher than approximately 60 Mx) would have left no signature in the O isotopic composition. These two stellar sources do not produce 60Fe and to ...
... Soni (2006) pollution of 26Al due to the winds of lowmass AGB stars (initial masses lower than approximately 1.5 Mx) and Wolf-Rayet stars (initial masses higher than approximately 60 Mx) would have left no signature in the O isotopic composition. These two stellar sources do not produce 60Fe and to ...
Astronomy 112: The Physics of Stars Class 14 Notes: The Main
... and the hydrogen burning stage is the one with the largest value of and the smallest value of L. When we look at a population of stars that are at many different ages, and thus at many random points in their lives, we expect the number of stars we see in a given population to be proportional to th ...
... and the hydrogen burning stage is the one with the largest value of and the smallest value of L. When we look at a population of stars that are at many different ages, and thus at many random points in their lives, we expect the number of stars we see in a given population to be proportional to th ...
Tycho Brahe
... After twenty years, Tycho had a run in with the new king, Christian IV, who wished to cut the astronomer’s stipend. Tycho closed the observatory, packed up his instruments, and set out to find a new sponsor. In 1599 he was appointed Imperial Mathematician in the court of the Holy Roman Emperor, Rudo ...
... After twenty years, Tycho had a run in with the new king, Christian IV, who wished to cut the astronomer’s stipend. Tycho closed the observatory, packed up his instruments, and set out to find a new sponsor. In 1599 he was appointed Imperial Mathematician in the court of the Holy Roman Emperor, Rudo ...
Module 4.1 - The Scale of the Universe [slide 1] We now turn to
... neat separation, between Hubble constant that sets the scale, and all other parameters that describe the qualitative behavior of the universe. So distances to anything, galaxies, quasars, anything cosmology, scale with Hubble's constant and thus its importance. Moreover, physical parameters of, obje ...
... neat separation, between Hubble constant that sets the scale, and all other parameters that describe the qualitative behavior of the universe. So distances to anything, galaxies, quasars, anything cosmology, scale with Hubble's constant and thus its importance. Moreover, physical parameters of, obje ...
The star-forming content of the W3 giant molecular cloud
... variations in the stellar IMF (Massey 2003). Turbulent fragmentation models of star formation (e.g. Padoan & Nordlund 2002) predict that complete Salpeterlike mass functions of gravitationally bound dense clumps will form spontanously in molecular clouds with driven turbulence. Such models also sugg ...
... variations in the stellar IMF (Massey 2003). Turbulent fragmentation models of star formation (e.g. Padoan & Nordlund 2002) predict that complete Salpeterlike mass functions of gravitationally bound dense clumps will form spontanously in molecular clouds with driven turbulence. Such models also sugg ...
Chapter 15 Stars, Galaxies, and Universe
... Galaxies •Huge group of single stars, star systems, star clusters, dust and gas •Many have black holes in center •Billions of stars in galaxy •Billions of galaxies in universe •Quasar – distant, very bright young galaxy with black hole in center. ...
... Galaxies •Huge group of single stars, star systems, star clusters, dust and gas •Many have black holes in center •Billions of stars in galaxy •Billions of galaxies in universe •Quasar – distant, very bright young galaxy with black hole in center. ...
Studies of molecular clouds at the Galactic centre Roland Karlsson DECLINATION (B1950)
... and evolution of star-forming complexes, ignition of starbursts as well as the overall kinematic behaviour of the interstellar medium throughout the Galaxy. In spiral galaxies, radial transport of material is considered essential for the build-up of the energy budget and the evolution of the various ...
... and evolution of star-forming complexes, ignition of starbursts as well as the overall kinematic behaviour of the interstellar medium throughout the Galaxy. In spiral galaxies, radial transport of material is considered essential for the build-up of the energy budget and the evolution of the various ...
Using time to measure distance - AS-A2
... sky. They were both in the south at midnight, which means that the Earth was directly between them and the Sun. This is called an ‘opposition’. It also means that the two planets were both at the same time at their closest to the Earth. At this time Jupiter was the brightest object in the night sky ...
... sky. They were both in the south at midnight, which means that the Earth was directly between them and the Sun. This is called an ‘opposition’. It also means that the two planets were both at the same time at their closest to the Earth. At this time Jupiter was the brightest object in the night sky ...
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.