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Distance determination for RAVE stars using stellar models
... be done without a reliable estimate of the distances to the stars under consideration. Therefore obtaining accurate distances and velocities for a representative sample of stars in our Galaxy will be essential if we are to understand both the structure of our own Galaxy and galaxy formation in gener ...
... be done without a reliable estimate of the distances to the stars under consideration. Therefore obtaining accurate distances and velocities for a representative sample of stars in our Galaxy will be essential if we are to understand both the structure of our own Galaxy and galaxy formation in gener ...
1. Uranus and Neptune
... Sun. Then came the discovery of Neptune, the eighth planet. But something was still wrong with the orbit of Uranus. Could yest another planet lurk unseen in the distant reaches of the Solar System, and could such a planet be affecting the orbit of Uranus? The first part of the question was answered ...
... Sun. Then came the discovery of Neptune, the eighth planet. But something was still wrong with the orbit of Uranus. Could yest another planet lurk unseen in the distant reaches of the Solar System, and could such a planet be affecting the orbit of Uranus? The first part of the question was answered ...
Gamma Ray Bursts
... • >100 bursts of this object found in old data in 1979-84 • most of them in 1983.11, some in groups, some single Soon, more SGR discovered • all in our Galaxy • all at SN remnants ~10 000 years old • X-ray oscillations found with ~8s period Puzzle solved in 1998 • in 3 years, the period of SGR 1806- ...
... • >100 bursts of this object found in old data in 1979-84 • most of them in 1983.11, some in groups, some single Soon, more SGR discovered • all in our Galaxy • all at SN remnants ~10 000 years old • X-ray oscillations found with ~8s period Puzzle solved in 1998 • in 3 years, the period of SGR 1806- ...
CHAPTER 1 The Formation and Structure of Stars
... • Stars form in these clouds when the densest parts of the clouds become unstable and contract under the influence of their own gravity. – Most clouds, though, do not appear to be gravitationally unstable and will not contract to form stars on their own. ...
... • Stars form in these clouds when the densest parts of the clouds become unstable and contract under the influence of their own gravity. – Most clouds, though, do not appear to be gravitationally unstable and will not contract to form stars on their own. ...
complete lab manual
... solar photography, and for studies of the solar spectrum. A unique optical system called SCRIBES permits simultaneous observations of the photosphere (using white light) and the solar chromosphere (using red light from hydrogen and ultraviolet light from calcium in the sun). ...
... solar photography, and for studies of the solar spectrum. A unique optical system called SCRIBES permits simultaneous observations of the photosphere (using white light) and the solar chromosphere (using red light from hydrogen and ultraviolet light from calcium in the sun). ...
Kepler Mission Workshop Presentation
... The photometer is composed of just one "instrument," which is, an array of 42 CCDs (charge coupled devices). Each 50x25 mm CCD has 2200x1024 pixels. The CCDs are not used to take pictures. The images are intentionally defocused to improve the photometric precision. ...
... The photometer is composed of just one "instrument," which is, an array of 42 CCDs (charge coupled devices). Each 50x25 mm CCD has 2200x1024 pixels. The CCDs are not used to take pictures. The images are intentionally defocused to improve the photometric precision. ...
Full Presentation Here
... Active Galactic Nuclei Active Galactic Nuclei refers to galaxies with a central region where high-energetic processes take place. • AGN have been found in all wavelength and they showed emission up to TeV energies. ...
... Active Galactic Nuclei Active Galactic Nuclei refers to galaxies with a central region where high-energetic processes take place. • AGN have been found in all wavelength and they showed emission up to TeV energies. ...
- National Optical Astronomy Observatory
... limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0.4 arcseconds would then be about right under good seeing.) ! Input scan parameters (number of steps, number of spectral frames, integration time, etc.) ! Start the scan sequence and simultaneously begin stepping the tra ...
... limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0.4 arcseconds would then be about right under good seeing.) ! Input scan parameters (number of steps, number of spectral frames, integration time, etc.) ! Start the scan sequence and simultaneously begin stepping the tra ...
Unit 1 test review and answer key 16
... ____ 36. Astronomical units are used to measure distances between different types of star systems. ____ 37. The light from a star that is travelling away from Earth will be red-shifted. ____ 38. According to the Big Bang theory, the universe will end in a Big Crunch. ____ 39. The Stellar Collision t ...
... ____ 36. Astronomical units are used to measure distances between different types of star systems. ____ 37. The light from a star that is travelling away from Earth will be red-shifted. ____ 38. According to the Big Bang theory, the universe will end in a Big Crunch. ____ 39. The Stellar Collision t ...
Rotation Periods of Wide Binaries in the Kepler Field
... faint for Kepler. Angus, et al. (2015) used rotation periods of Kepler stars as well as cluster stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c)b , where A is the age of a star in Myr and a, b, and n are constants. They found however that so ...
... faint for Kepler. Angus, et al. (2015) used rotation periods of Kepler stars as well as cluster stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c)b , where A is the age of a star in Myr and a, b, and n are constants. They found however that so ...
ppt cometison deka eyesonison large
... venture near enough to the sun as that icy material transforms from a solid to a gas, a process known as sublimation. Jets powered by sublimating ice also release dust, which reflect sunlight and brightens the overall look of the comet in the sky. In late November 2013, its icy material will sublima ...
... venture near enough to the sun as that icy material transforms from a solid to a gas, a process known as sublimation. Jets powered by sublimating ice also release dust, which reflect sunlight and brightens the overall look of the comet in the sky. In late November 2013, its icy material will sublima ...
Atmospheric-Turbulence Compensation Experiments Using
... One of the major objectives of the SWAT program was to develop and then demonstrate the technology necessary for compensating for the effects of atmospheric turbulence on laser beams originating from a ground transmitter and propagating to low-earthorbit satellites. In fulfilling this objective, we ...
... One of the major objectives of the SWAT program was to develop and then demonstrate the technology necessary for compensating for the effects of atmospheric turbulence on laser beams originating from a ground transmitter and propagating to low-earthorbit satellites. In fulfilling this objective, we ...
GCSE (9-1) Astronomy - Edexcel
... of planets and stars, the cycles in the night and daytime sky, and the way in which we use technology to observe and interact with space. Students will follow an incredible story of how scientists, from ancient civilisations to the modern day, have used their imagination and carefully recorded visua ...
... of planets and stars, the cycles in the night and daytime sky, and the way in which we use technology to observe and interact with space. Students will follow an incredible story of how scientists, from ancient civilisations to the modern day, have used their imagination and carefully recorded visua ...
Abstract book
... age clusters (1 to 3 Gyrs) represent one of the most challenging test for the theory of AGB evolution and nucleosynthesis. Their masses (1.3 to 2.5 M_\odot) coincides with those of the stars responsible for the Galactic production of the s process main and strong components, which include about an h ...
... age clusters (1 to 3 Gyrs) represent one of the most challenging test for the theory of AGB evolution and nucleosynthesis. Their masses (1.3 to 2.5 M_\odot) coincides with those of the stars responsible for the Galactic production of the s process main and strong components, which include about an h ...
FIRST STELLAR ABUNDANCES IN THE DWARF IRREGULAR
... evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemical evolution of a galaxy depends on the contributions of all its constituents, e.g., SNe type Ia and II, high mass sta ...
... evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemical evolution of a galaxy depends on the contributions of all its constituents, e.g., SNe type Ia and II, high mass sta ...
ALMA band 9 optical layout
... compensation by a pair of ellipsoidal mirrors is discussed. A concept of frequency independent radiation coupling between the horn and the Cassegrain telescope system is presented. An expression for parameters of two elliptical mirrors giving rise to frequency independent matching of the horn to the ...
... compensation by a pair of ellipsoidal mirrors is discussed. A concept of frequency independent radiation coupling between the horn and the Cassegrain telescope system is presented. An expression for parameters of two elliptical mirrors giving rise to frequency independent matching of the horn to the ...
Lecture-25 Notes - Georgia Southern University Astrophysics
... 4) “Regular” galaxy clusters are ~spherical, centrally concentrated, very massive, and are dominated by large ellipticals/S0’s in their cores. Spirals are found in the outskirts. Large amounts of ~107 K X-ray emitting gas is present. 5) “Irregular” clusters are smaller, looser, and dominated by spir ...
... 4) “Regular” galaxy clusters are ~spherical, centrally concentrated, very massive, and are dominated by large ellipticals/S0’s in their cores. Spirals are found in the outskirts. Large amounts of ~107 K X-ray emitting gas is present. 5) “Irregular” clusters are smaller, looser, and dominated by spir ...
m V
... • Mean dust density in the galactic disk is ndust ~ 10-6 grains/m3 Compare this to mean gas density of ngas ~ 10+6 gas atoms/m3 • Mean visual extinction in galactic plane (b = 0º) is AV ~ 1 to 2 mag. for each kpc of distance but the distribution is very patchy. ...
... • Mean dust density in the galactic disk is ndust ~ 10-6 grains/m3 Compare this to mean gas density of ngas ~ 10+6 gas atoms/m3 • Mean visual extinction in galactic plane (b = 0º) is AV ~ 1 to 2 mag. for each kpc of distance but the distribution is very patchy. ...
How we found about COMETS
... 130 BC, one of them, Hipparchus, had calculated that the Moon was about 386,000 kilometers from the Earth. In 1577, Tycho decided to try to measure the parallax of the comet in the sky, as Hipparchus had measured the parallax of the Moon. If the comet was part of the air, it should be much closer th ...
... 130 BC, one of them, Hipparchus, had calculated that the Moon was about 386,000 kilometers from the Earth. In 1577, Tycho decided to try to measure the parallax of the comet in the sky, as Hipparchus had measured the parallax of the Moon. If the comet was part of the air, it should be much closer th ...
Astrobiology - Anatomy Atlases
... • At time of Sputnik's launch in 1957, Joshua Lederberg realized that if humans were about to travel into space, they could spread terrestrial organisms to other planets + bring alien organisms back to Earth • Man was set to destroy indigenous life-forms across solar system or ourselves - a "cosmi ...
... • At time of Sputnik's launch in 1957, Joshua Lederberg realized that if humans were about to travel into space, they could spread terrestrial organisms to other planets + bring alien organisms back to Earth • Man was set to destroy indigenous life-forms across solar system or ourselves - a "cosmi ...
Observational Data
... from R23 by using [O II], [O III] vs Hβ (or Hα by assuming intrinsic ratio of Hβ/Hα constant) as metallicity indicator. If these z~2 starbursts are progenitors of z~1 EROs and local ellipticals, their metallicity should be high, at least near-solar or more. Metallicity is a good indicator of stellar ...
... from R23 by using [O II], [O III] vs Hβ (or Hα by assuming intrinsic ratio of Hβ/Hα constant) as metallicity indicator. If these z~2 starbursts are progenitors of z~1 EROs and local ellipticals, their metallicity should be high, at least near-solar or more. Metallicity is a good indicator of stellar ...
V. - Humboldt Digital Library
... pressed as to whether it has been tions of the Sun influence the terrestrial magnetism," the new and ex» cellent investigations of Faraday have proved the reality of such an influence. Long series of magnetic observations in opposite hemispheres (e. g., Toronto in Canada, and Hobart Town in Van Dier ...
... pressed as to whether it has been tions of the Sun influence the terrestrial magnetism," the new and ex» cellent investigations of Faraday have proved the reality of such an influence. Long series of magnetic observations in opposite hemispheres (e. g., Toronto in Canada, and Hobart Town in Van Dier ...
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.