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MANU-CHAO: A Ground-Layer Adaptive Optics Experiment for the
... 20 km 1st step: have a look at the atmospheric turbulence above Mt. Graham: • SCIDAR measurements for 16 nights (more observations this week) – measure the strength of the turbulence as a function of the altitude above the mountain (CN2 profile) ...
... 20 km 1st step: have a look at the atmospheric turbulence above Mt. Graham: • SCIDAR measurements for 16 nights (more observations this week) – measure the strength of the turbulence as a function of the altitude above the mountain (CN2 profile) ...
Angular Momentum Evolution of Young Low
... stars in molecular clouds and young open clusters provide the best way to trace their angular momentum evolution from about 1 million years ago (Ma) to 1 billion years ago (Ga). This section discusses the observational studies of stellar rotation performed since the PPV review by Herbst al. (2007), ...
... stars in molecular clouds and young open clusters provide the best way to trace their angular momentum evolution from about 1 million years ago (Ma) to 1 billion years ago (Ga). This section discusses the observational studies of stellar rotation performed since the PPV review by Herbst al. (2007), ...
Astronomical Adaptive Optics using Multiple Laser Guide Stars
... for an advanced degree at the University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this dissertation are allowable without special permission, provided that accurate acknowledgment of source is made. Requ ...
... for an advanced degree at the University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this dissertation are allowable without special permission, provided that accurate acknowledgment of source is made. Requ ...
The magnetic field of epsilon Eri
... star, the Sun, is a fairly small star, and there are many more solar-type stars. The Sun has a magnetic eld that strongly aects Earth. During the solar cycle, the magnetic eld causes sunspots to appear in dierent amounts, depending on when it is in the cycle. From the sunspots, magnetic eld lin ...
... star, the Sun, is a fairly small star, and there are many more solar-type stars. The Sun has a magnetic eld that strongly aects Earth. During the solar cycle, the magnetic eld causes sunspots to appear in dierent amounts, depending on when it is in the cycle. From the sunspots, magnetic eld lin ...
mg_colloq - University of Massachusetts Amherst
... halos around the compact core of cETG at z≈2 (e.g. tidal tails, companions) Stack of all ETGs in the CANDELS sample in GOODS Residuals consistent with NORMAL surface density of intervening sources ...
... halos around the compact core of cETG at z≈2 (e.g. tidal tails, companions) Stack of all ETGs in the CANDELS sample in GOODS Residuals consistent with NORMAL surface density of intervening sources ...
Towards the understanding of the deepest layers of solar
... I would like to start by thanking both my supervisors, Dra. Margarida Cunha and Prof. Dr. Jørgen Christensen-Dalsgaard, without whom the realization of this thesis would not have been possible. I would like to give a very special thank to Prof. Dr. Jørgen ChristensenDalsgaard for his hospitality and ...
... I would like to start by thanking both my supervisors, Dra. Margarida Cunha and Prof. Dr. Jørgen Christensen-Dalsgaard, without whom the realization of this thesis would not have been possible. I would like to give a very special thank to Prof. Dr. Jørgen ChristensenDalsgaard for his hospitality and ...
Jul y 9- 11,
... central supermassive black holes (SMBHs) will be more often present even in smaller galaxies when seeds are generated from the remnants of the first massive stars rather than via direct gas collapse. Consequently, measurement of the local occupation fraction provides an observational discriminator b ...
... central supermassive black holes (SMBHs) will be more often present even in smaller galaxies when seeds are generated from the remnants of the first massive stars rather than via direct gas collapse. Consequently, measurement of the local occupation fraction provides an observational discriminator b ...
Slide 1
... Approximately how much time goes by between high and low tides at any location on Earth? Just over 6 hours ...
... Approximately how much time goes by between high and low tides at any location on Earth? Just over 6 hours ...
Building galaxies Hunt, Leslie Kipp
... conjectured that “There may be innumerable spheres of this kind or starry heavens in the finite universe”. Thomas Wright of Durham, England, a few years after, interpreted the observations at that time of “the many cloudy Spots, just perceivable by us, as far without our starry Regions”. This idea w ...
... conjectured that “There may be innumerable spheres of this kind or starry heavens in the finite universe”. Thomas Wright of Durham, England, a few years after, interpreted the observations at that time of “the many cloudy Spots, just perceivable by us, as far without our starry Regions”. This idea w ...
Designing a Space Telescope to Image Earth
... ing through the pupil plane from a plane pupil plane given direction at a certain point on the focal plane, say (0, 0). However, the wave nature of light makes it impossible to concentrate all of the light at a point. Instead, a small disk, called the Airy disk, with diffraction rings around it appe ...
... ing through the pupil plane from a plane pupil plane given direction at a certain point on the focal plane, say (0, 0). However, the wave nature of light makes it impossible to concentrate all of the light at a point. Instead, a small disk, called the Airy disk, with diffraction rings around it appe ...
Protoplanetary Discs
... 1. The invention of infrared detectors ⇒ Infrared measurements revealed circumstellar matter in “spectral enegery distributions” (SEDs) ⇒ Differences between “extinction” and “excess” allowed the conclusion that matter is distributed not in a shell, but in a disc ...
... 1. The invention of infrared detectors ⇒ Infrared measurements revealed circumstellar matter in “spectral enegery distributions” (SEDs) ⇒ Differences between “extinction” and “excess” allowed the conclusion that matter is distributed not in a shell, but in a disc ...
The Terrestrial Planet Finder Mission
... ing through the pupil plane from a plane pupil plane given direction at a certain point on the focal plane, say (0, 0). However, the wave nature of light makes it impossible to concentrate all of the light at a point. Instead, a small disk, called the Airy disk, with diffraction rings around it appe ...
... ing through the pupil plane from a plane pupil plane given direction at a certain point on the focal plane, say (0, 0). However, the wave nature of light makes it impossible to concentrate all of the light at a point. Instead, a small disk, called the Airy disk, with diffraction rings around it appe ...
The CCD Photometric Calibration Cookbook
... CCD (Charge-Coupled Device) photometric calibration is concerned with converting the arbitrary units in which CCD images are recorded into standard, reproducible units. In principle the observed brightness could be calibrated into genuine physical units, such as W m , and indeed this is occasionally ...
... CCD (Charge-Coupled Device) photometric calibration is concerned with converting the arbitrary units in which CCD images are recorded into standard, reproducible units. In principle the observed brightness could be calibrated into genuine physical units, such as W m , and indeed this is occasionally ...
The chemical composition of solar-type stars and its impact on the
... iron abundance [Fe/H] is often used as an approximation for the overall metallicity in a star. It is common to use the unit dex in this context to account for logarithmic values. Since we use the logarithm to base ten, one dex stands for one order of magnitude. ...
... iron abundance [Fe/H] is often used as an approximation for the overall metallicity in a star. It is common to use the unit dex in this context to account for logarithmic values. Since we use the logarithm to base ten, one dex stands for one order of magnitude. ...
19th Century Ether Theory.1
... illustrated in the drawing on the right. The orbit of the earth has been shrunk to a point to indicate that the star is so far away that its parallax is unobservable. The arrows labeled 1 through 4 represent the earth’s velocity at the points of the earth’s orbit labeled 1 through 4 in the drawing ...
... illustrated in the drawing on the right. The orbit of the earth has been shrunk to a point to indicate that the star is so far away that its parallax is unobservable. The arrows labeled 1 through 4 represent the earth’s velocity at the points of the earth’s orbit labeled 1 through 4 in the drawing ...
Revising the census of low luminosity AGN
... A LOW EW (~1 Å) IS CHARACTERISTIC OF STELLAR PROCESSES AGN 10 - Roma 10/09/2012 ...
... A LOW EW (~1 Å) IS CHARACTERISTIC OF STELLAR PROCESSES AGN 10 - Roma 10/09/2012 ...
The physics and modes of star cluster formation: observations
... phase of early stellar evolution. As many as 50 per cent of all members of a young cluster may have lost their discs and any other accretion signatures at an age of 2–3 Myr. Observations made from space with X-ray observatories, such as the Chandra X-ray Observatory, have shown that young stars emit ...
... phase of early stellar evolution. As many as 50 per cent of all members of a young cluster may have lost their discs and any other accretion signatures at an age of 2–3 Myr. Observations made from space with X-ray observatories, such as the Chandra X-ray Observatory, have shown that young stars emit ...
- Spiral - Imperial College London
... One of the most robust patterns of stellar variability established by the Lowell program was a conspicuous division between less active (and consequently older, see e.g. Soderblom et al. 1991) and more active (younger) stars. The former usually demonstrate a direct correlation between brightness and ...
... One of the most robust patterns of stellar variability established by the Lowell program was a conspicuous division between less active (and consequently older, see e.g. Soderblom et al. 1991) and more active (younger) stars. The former usually demonstrate a direct correlation between brightness and ...
Article PDF - IOPscience
... objects (CSOs) taken with the Infrared Spectrograph on the Spitzer Space Telescope. The hosts of these young, powerful radio galaxies show significant diversity in their mid-IR spectra. This includes multiple atomic fine-structure lines, H2 gas, polycyclic aromatic hydrocarbon (PAH) emission, warm d ...
... objects (CSOs) taken with the Infrared Spectrograph on the Spitzer Space Telescope. The hosts of these young, powerful radio galaxies show significant diversity in their mid-IR spectra. This includes multiple atomic fine-structure lines, H2 gas, polycyclic aromatic hydrocarbon (PAH) emission, warm d ...
Radio Emission Toward Regions of Massive Star Formation
... the observational work on massive YSOs is carried out at infrared and radio frequencies. Despite their low numbers, it is high-mass stars that do most of the work in galaxies. They ...
... the observational work on massive YSOs is carried out at infrared and radio frequencies. Despite their low numbers, it is high-mass stars that do most of the work in galaxies. They ...
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.