Relativity, Space-Time And Cosmology
... Every single culture has had a theory of the formation of the universe and the laws that rule it. Such a system is called a cosmology (from the Greek kosmos: world, and logia from legein: to speak). The first coherent non-religious cosmology was developed during ancient Greece, and much attention wi ...
... Every single culture has had a theory of the formation of the universe and the laws that rule it. Such a system is called a cosmology (from the Greek kosmos: world, and logia from legein: to speak). The first coherent non-religious cosmology was developed during ancient Greece, and much attention wi ...
Active mirror technology for large space telescopes
... the surface normal displacement without applying lateral forces or moments of any significance. Space based systems must also have a capability to withstand launch loads. For the very light mirrors we have chosen to utilize much the same load paths for launch restraints and operational supports. The ...
... the surface normal displacement without applying lateral forces or moments of any significance. Space based systems must also have a capability to withstand launch loads. For the very light mirrors we have chosen to utilize much the same load paths for launch restraints and operational supports. The ...
Quiescent and flaring X-ray emission from the nearby M/T dwarf
... Loiseau 2008). XMM-Newton carries three X-ray CCD cameras with moderate spectral resolution, as well as two X-ray grating spectrometers, which provide higher spectral resolution. However, the detected signal in the RGS (Reflection Grating Spectrometer) detectors is rather weak; while we clearly see ...
... Loiseau 2008). XMM-Newton carries three X-ray CCD cameras with moderate spectral resolution, as well as two X-ray grating spectrometers, which provide higher spectral resolution. However, the detected signal in the RGS (Reflection Grating Spectrometer) detectors is rather weak; while we clearly see ...
High-precision abundances of elements in solar twin stars: Trends
... Context. High-precision determinations of abundances of elements in the atmospheres of the Sun and solar twin stars indicate that the Sun has an unusual low ratio between refractory and volatile elements. This has led to the suggestion that the relation between abundance ratios, [X/Fe], and elementa ...
... Context. High-precision determinations of abundances of elements in the atmospheres of the Sun and solar twin stars indicate that the Sun has an unusual low ratio between refractory and volatile elements. This has led to the suggestion that the relation between abundance ratios, [X/Fe], and elementa ...
Annual Report 2006/2007
... is the brightest radio source in the sky, and has been created by a supernova explosion about 330 year ago. The star itself had a mass of around 20 times the mass of the sun, but by the time it exploded it must have lost most of the outer layers. The red and green colors in the image are obtained fr ...
... is the brightest radio source in the sky, and has been created by a supernova explosion about 330 year ago. The star itself had a mass of around 20 times the mass of the sun, but by the time it exploded it must have lost most of the outer layers. The red and green colors in the image are obtained fr ...
astronomy (astr)
... ASTR 102. Introduction to Astronomy: Stars, Galaxies & Cosmology. 3 Credits. The sun, stellar observables, star birth, evolution, and death, novae and supernovae, white dwarfs, neutron stars, black holes, the Milky Way galaxy, normal galaxies, active galaxies and quasars, dark matter, dark energy, c ...
... ASTR 102. Introduction to Astronomy: Stars, Galaxies & Cosmology. 3 Credits. The sun, stellar observables, star birth, evolution, and death, novae and supernovae, white dwarfs, neutron stars, black holes, the Milky Way galaxy, normal galaxies, active galaxies and quasars, dark matter, dark energy, c ...
The physics of white dwarfs
... 400 of these stars. More recently, satellite and rocket-borne observations have begun to open up the far ultraviolet and x-ray regions of the spectrum that are inaccessible from ground-based observations, and important new results have already been obtained from this research. It became apparent qui ...
... 400 of these stars. More recently, satellite and rocket-borne observations have begun to open up the far ultraviolet and x-ray regions of the spectrum that are inaccessible from ground-based observations, and important new results have already been obtained from this research. It became apparent qui ...
Astronomical imaging using ground
... As a new system at the MMT, the operation and implementation of the closed-loop laser AO system is a continually evolving process. The first step is the alignment of the telescope and science camera. The adaptive secondary mirror is set to the ‘flat’ position. This position most closely resembles a ...
... As a new system at the MMT, the operation and implementation of the closed-loop laser AO system is a continually evolving process. The first step is the alignment of the telescope and science camera. The adaptive secondary mirror is set to the ‘flat’ position. This position most closely resembles a ...
SpeX Observing Manual - NASA Infrared Telescope Facility
... SpeX is a medium-resolution infrared spectrograph built at the Institute for Astronomy (IfA), for the NASA Infrared Telescope Facility (IRTF) on Mauna Kea. The National Science Foundation (NSF) originally funded SpeX in 1996 with additional funding from NASA for the detector arrays in 1998. SpeX saw ...
... SpeX is a medium-resolution infrared spectrograph built at the Institute for Astronomy (IfA), for the NASA Infrared Telescope Facility (IRTF) on Mauna Kea. The National Science Foundation (NSF) originally funded SpeX in 1996 with additional funding from NASA for the detector arrays in 1998. SpeX saw ...
151110_1430_Operations_Planning_Update_
... programmes, to organise and conduct improvements and upgrades of the SKA telescopes in order to provide and maintain facilities that are at the forefront of science and technology, and to ensure the protection of the SKA sites for the SKA and future radio telescopes. ...
... programmes, to organise and conduct improvements and upgrades of the SKA telescopes in order to provide and maintain facilities that are at the forefront of science and technology, and to ensure the protection of the SKA sites for the SKA and future radio telescopes. ...
Lamp mapping technique for independent determination of
... described by Avila et al. [9], while for nitrogen, the transitions were calculated using the methods summarized in the article by Adam [12]. We obtained values for the total cross section of 2:744 × 1034 m2 =sr and 6:952 × 1034 m2 =sr for nitrogen and water vapor, respectively. In our analysis we ...
... described by Avila et al. [9], while for nitrogen, the transitions were calculated using the methods summarized in the article by Adam [12]. We obtained values for the total cross section of 2:744 × 1034 m2 =sr and 6:952 × 1034 m2 =sr for nitrogen and water vapor, respectively. In our analysis we ...
An Unbiased Near-infrared Interferometric Survey for Hot
... the hot material is supplied through some mechanism from this outer reservoir. Our team carried out the first large, NIR interferometric survey for hot exozodiacal dust in order to statistically address the questions on the origin and evolution of these enigmatic systems (Absil et al., 2013; Ertel e ...
... the hot material is supplied through some mechanism from this outer reservoir. Our team carried out the first large, NIR interferometric survey for hot exozodiacal dust in order to statistically address the questions on the origin and evolution of these enigmatic systems (Absil et al., 2013; Ertel e ...
Cycles of magnetic activity in solar-type stars. The place of the Sun
... It is well known that the duration of the 11-yr cycle of solar activity (Schwabe cycle) ranges from 7 to 17 years according to a century and a half of direct solar observations. Durations of chromospheric activity cycles, found for 50 stars of late spectral classes (F, G and K), vary from 7 to 20 ye ...
... It is well known that the duration of the 11-yr cycle of solar activity (Schwabe cycle) ranges from 7 to 17 years according to a century and a half of direct solar observations. Durations of chromospheric activity cycles, found for 50 stars of late spectral classes (F, G and K), vary from 7 to 20 ye ...
Notes - Bill Wolf
... Absolute and Apparent Magnitude Obviously how bright a star appears on earth is only somewhat related to how bright the star actually is, since varying distances can make a star appear brighter or dimmer. Astronomer then use the word brightness generically to talk about how bright a star appears fro ...
... Absolute and Apparent Magnitude Obviously how bright a star appears on earth is only somewhat related to how bright the star actually is, since varying distances can make a star appear brighter or dimmer. Astronomer then use the word brightness generically to talk about how bright a star appears fro ...
2009 THE INTERNATIONAL YEAR OF ASTRONOMY
... Copernicus, Brahe & Kepler Galilei and the telescope Galilei’s observations and Neptune ...
... Copernicus, Brahe & Kepler Galilei and the telescope Galilei’s observations and Neptune ...
DIRECT OBSERVATION OF GRAVITATIONAL WAVES DIRECT
... as the planet orbits the Sun. What we mean by this is that the point of closest approach to the Sun, called the perihelion, slowly rotates around the Sun, as does the point of greatest distance from the Sun, the aphelion (see Figure 6). The amount of this orbital shift is very small, and most of ...
... as the planet orbits the Sun. What we mean by this is that the point of closest approach to the Sun, called the perihelion, slowly rotates around the Sun, as does the point of greatest distance from the Sun, the aphelion (see Figure 6). The amount of this orbital shift is very small, and most of ...
MCWP 3-16.7 Chapter 7: Astronomy
... pattern, all of which affect the Earth’s relationship to the stars and other planets. The Earth’s axis has a cone-shaped motion (or precession) making one turn in 25,800 solar years or one platonic year (great year). This is caused by torque imposed on the Earth mostly by the Moon and Sun. Visualize ...
... pattern, all of which affect the Earth’s relationship to the stars and other planets. The Earth’s axis has a cone-shaped motion (or precession) making one turn in 25,800 solar years or one platonic year (great year). This is caused by torque imposed on the Earth mostly by the Moon and Sun. Visualize ...
The ALTIUS mission
... wavelength away from its incident direction (by a few degrees). The diverted beam can then be collected by an off-axis optical detector. Used inside an imaging system, such a device offers many advantages:it is small and lightweight, contains no moving parts, it consumes only 1 to 3 watts and can be ...
... wavelength away from its incident direction (by a few degrees). The diverted beam can then be collected by an off-axis optical detector. Used inside an imaging system, such a device offers many advantages:it is small and lightweight, contains no moving parts, it consumes only 1 to 3 watts and can be ...
CHaracterising ExOPlanets Satellite arXiv:1310.7800v1 [astro
... Space Agency. It will carry out follow-up measurements on transiting planets. This requires exquisite data that can be acquired only by a space-borne observatory and by well understood and mitigated sources of noise. Earth stray light is one of them which becomes the most prominent noise for faint s ...
... Space Agency. It will carry out follow-up measurements on transiting planets. This requires exquisite data that can be acquired only by a space-borne observatory and by well understood and mitigated sources of noise. Earth stray light is one of them which becomes the most prominent noise for faint s ...
Optical Fabrication and Testing - National Optical Astronomy
... • Astronomers are already planning telescopes larger ...
... • Astronomers are already planning telescopes larger ...
International Ultraviolet Explorer
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.