Document
... clusters, and there are also superclusters separated by enormous voids. By looking back in time at very distant galaxies and clusters, we can study how they formed and evolved. Surprisingly, we now know that all these enormous structures consist largely of “dark matter” that emits little or no elect ...
... clusters, and there are also superclusters separated by enormous voids. By looking back in time at very distant galaxies and clusters, we can study how they formed and evolved. Surprisingly, we now know that all these enormous structures consist largely of “dark matter” that emits little or no elect ...
The evolution of low-metallicity massive stars - Argelander
... find that the fast rotating models (& 300 km/s) become a particular type of objects predicted only at low-metallicity: the so-called Transparent Wind Ultraviolet INtense (TWUIN) stars. TWUIN stars are fast rotating massive stars that are extremely hot (90 kK), very bright and as compact as Wolf–Raye ...
... find that the fast rotating models (& 300 km/s) become a particular type of objects predicted only at low-metallicity: the so-called Transparent Wind Ultraviolet INtense (TWUIN) stars. TWUIN stars are fast rotating massive stars that are extremely hot (90 kK), very bright and as compact as Wolf–Raye ...
Understanding Variable Stars - Central Florida Astronomical Society
... perspective, an introduction to stars in general, the techniques for discovering and studying variable stars, and a description of the main types of variable stars. It ends with short reflections about the connection between the study of variable stars, and research, education, amateur astronomy, and ...
... perspective, an introduction to stars in general, the techniques for discovering and studying variable stars, and a description of the main types of variable stars. It ends with short reflections about the connection between the study of variable stars, and research, education, amateur astronomy, and ...
Document
... • First observational evidence for gravitational waves • Confirmation of General Relativity as an accurate description of strong-field gravity ...
... • First observational evidence for gravitational waves • Confirmation of General Relativity as an accurate description of strong-field gravity ...
Proposal - ESA Science
... pointing of the spacecraft. The FGS provides simultaneous information on the photometric stability of the target stars. The instrument design uses only technologies with a high degree of technical maturity. Transit spectroscopy means that no angular resolution is required and detailed performance st ...
... pointing of the spacecraft. The FGS provides simultaneous information on the photometric stability of the target stars. The instrument design uses only technologies with a high degree of technical maturity. Transit spectroscopy means that no angular resolution is required and detailed performance st ...
DIO 15 - DIO, The International Journal of Scientific History
... where p is the precession constant (about 1.4° per century). It is clear that the size of σt can be made smaller and smaller by using more stars N. There is another easy, and equally naïve and incorrect, way to determine the uncertainty σt, and that is to use a Monte Carlo simulation. Having determi ...
... where p is the precession constant (about 1.4° per century). It is clear that the size of σt can be made smaller and smaller by using more stars N. There is another easy, and equally naïve and incorrect, way to determine the uncertainty σt, and that is to use a Monte Carlo simulation. Having determi ...
Modeling, Simulation, and Characterization of Space Debris in low
... The study of space debris is of critical importance to all space-faring nations. Characterization efforts are proposed using long-wave infrared sensors for space-based observations of debris objects in low-Earth orbit. Long-wave infrared sensors are commercially available and do not require solar il ...
... The study of space debris is of critical importance to all space-faring nations. Characterization efforts are proposed using long-wave infrared sensors for space-based observations of debris objects in low-Earth orbit. Long-wave infrared sensors are commercially available and do not require solar il ...
DIO vol. 15 - DIO, The International Journal of Scientific History
... these successes, I started a full-scale survey of the ecliptic region in 1977. This promptly led to my discovery of the object Chiron in November of that year. In the back of my mind during this survey, was the possibility of discovering a new planet. The only evidence that such a planet might exist ...
... these successes, I started a full-scale survey of the ecliptic region in 1977. This promptly led to my discovery of the object Chiron in November of that year. In the back of my mind during this survey, was the possibility of discovering a new planet. The only evidence that such a planet might exist ...
Untitled - NMSU Astronomy
... wavelength of spectral lines in nanometers, and measure the sizes of features on the Sun that are larger than 100,000 kilometers. ...
... wavelength of spectral lines in nanometers, and measure the sizes of features on the Sun that are larger than 100,000 kilometers. ...
I N S T
... Scope Setup Features ............................................................................................................................................................................22 Steup Time-Site......................................................................................... ...
... Scope Setup Features ............................................................................................................................................................................22 Steup Time-Site......................................................................................... ...
Stellar Intensity Interferometry: The Background John Davis Sydney Institute for Astronomy
... stars”. Robert Hanbury Brown (RHB) was determined to measure them • If these sources were galaxies their angular sizes would be of the order of a minute of arc and easy to measure with a conventional interferometer but, if they were stars, extremely long baselines would be needed and RHB concluded ...
... stars”. Robert Hanbury Brown (RHB) was determined to measure them • If these sources were galaxies their angular sizes would be of the order of a minute of arc and easy to measure with a conventional interferometer but, if they were stars, extremely long baselines would be needed and RHB concluded ...
The ALMA Universe - ALMA Observatory
... Each one of ALMA’s 12-meter diameter antennas is thus larger than the largest visible-light telescopes on Earth. ALMA will have 54 antennas of twelve meters in diameter and 12 antennas that are seven meters in diameter. The latter antennas, as well as four of the larger ones, make up the Atacama Com ...
... Each one of ALMA’s 12-meter diameter antennas is thus larger than the largest visible-light telescopes on Earth. ALMA will have 54 antennas of twelve meters in diameter and 12 antennas that are seven meters in diameter. The latter antennas, as well as four of the larger ones, make up the Atacama Com ...
IRAM Annual Report 2014
... stars. In order to shed new light on the formation of stars more than 10 times the mass of our Sun, an international team of astronomers led by Nicolas Peretto (Cardiff University) has used the IRAM 30-meter telescope in Spain. Stars form in some of the coldest (~10 Kelvin) regions of the Universe, ...
... stars. In order to shed new light on the formation of stars more than 10 times the mass of our Sun, an international team of astronomers led by Nicolas Peretto (Cardiff University) has used the IRAM 30-meter telescope in Spain. Stars form in some of the coldest (~10 Kelvin) regions of the Universe, ...
MPA Anniversary Brochure - Max Planck Institute for Astrophysics
... Not only the content of astronomy, but also its practice has been through several revolutions during MPA’s lifetime. Astronomical observations have been extended from the traditional optical domain to all parts of the electromagnetic spectrum, and even beyond, to neutrinos, energetic particles and, ...
... Not only the content of astronomy, but also its practice has been through several revolutions during MPA’s lifetime. Astronomical observations have been extended from the traditional optical domain to all parts of the electromagnetic spectrum, and even beyond, to neutrinos, energetic particles and, ...
Chandra News March 2005 Published by the Chandra X-ray Center (CXC)
... on approach to the X-ray minimum, while the higher-temperature He-like Fe lines (which are unresolved in the HEG spectra) do not. The line shifts in all cases are much larger than the expected orbital velocities near periastron, and so do not appear to represent the bulk motion of the shock cone. Th ...
... on approach to the X-ray minimum, while the higher-temperature He-like Fe lines (which are unresolved in the HEG spectra) do not. The line shifts in all cases are much larger than the expected orbital velocities near periastron, and so do not appear to represent the bulk motion of the shock cone. Th ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.