PDF file of document - University of Iowa Astrophysics
... guide your progress and test your understanding of the concepts discussed. Your score for the project will be determined by how well you answer these questions. If you are confused about questions as you progress, ask your lab instructor for assistance. Questions near the end of the project often bu ...
... guide your progress and test your understanding of the concepts discussed. Your score for the project will be determined by how well you answer these questions. If you are confused about questions as you progress, ask your lab instructor for assistance. Questions near the end of the project often bu ...
Radio pulsars
... • Some pulsars are in orbit around another star. Orbital periods range from 1.6 hours to several years. • Only a few percent of normal pulsars, but more than half of all millisecond pulsars, are binary. • Pulsar companion stars range from very low-mass white dwarfs (~0.01 solar masses) to heavy norm ...
... • Some pulsars are in orbit around another star. Orbital periods range from 1.6 hours to several years. • Only a few percent of normal pulsars, but more than half of all millisecond pulsars, are binary. • Pulsar companion stars range from very low-mass white dwarfs (~0.01 solar masses) to heavy norm ...
Spring 2015 Mercury - Astronomical Society of the Pacific
... The Eagle Nebula wasn’t new to astronomers. Telescopic observations of M16 go back to 1745 when the Swiss astronomer JeanPhilippe de Chéseaux discovered it as a star cluster. Charles Messier observed it in 1764 and noted a nebula surrounding the cluster. Using a much more powerful telescope, Caroli ...
... The Eagle Nebula wasn’t new to astronomers. Telescopic observations of M16 go back to 1745 when the Swiss astronomer JeanPhilippe de Chéseaux discovered it as a star cluster. Charles Messier observed it in 1764 and noted a nebula surrounding the cluster. Using a much more powerful telescope, Caroli ...
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... assist observers during their time at the telescope. FACSUM attempts to provide a telescope-‐monitoring interface that can provide the same information displayed on the CRT monitors directly connected to the ...
... assist observers during their time at the telescope. FACSUM attempts to provide a telescope-‐monitoring interface that can provide the same information displayed on the CRT monitors directly connected to the ...
10-Jets and outflows
... 1 pc has grown at the speed of 10 km s−1 , then it must be 105 years old, comparable to the age of a Class I protostar. In general, outflow sizes range from under 0.1 pc to several parsecs. Furthermore, outflow speeds range from a few km s−1 up to about 100 km s−1 . Therefore, kinematic ages take on ...
... 1 pc has grown at the speed of 10 km s−1 , then it must be 105 years old, comparable to the age of a Class I protostar. In general, outflow sizes range from under 0.1 pc to several parsecs. Furthermore, outflow speeds range from a few km s−1 up to about 100 km s−1 . Therefore, kinematic ages take on ...
Observations of Jets and Outflows from Young Stars
... of the source. In young, high density molecular jets, these shocks can excite H2 O maser spots and H2 emission; in mostly atomic or ionized jets from somewhat older sources, knots of Hα and/or forbidden line emission are produced. The primary jets and winds transfer momentum and entrain their surrou ...
... of the source. In young, high density molecular jets, these shocks can excite H2 O maser spots and H2 emission; in mostly atomic or ionized jets from somewhat older sources, knots of Hα and/or forbidden line emission are produced. The primary jets and winds transfer momentum and entrain their surrou ...
An Expanded View of the Universe
... Telescope (E-ELT). With a majestic primary mirror almost ~40 metres in diameter, it will be the world’s biggest eye on the sky. The telescope has an innovative five-mirror design that includes advanced adaptive optics to correct for the turbulent atmosphere, giving exceptional image quality. The ma ...
... Telescope (E-ELT). With a majestic primary mirror almost ~40 metres in diameter, it will be the world’s biggest eye on the sky. The telescope has an innovative five-mirror design that includes advanced adaptive optics to correct for the turbulent atmosphere, giving exceptional image quality. The ma ...
Stars sensors terminology and performance
... This Standard is one of the series of ECSS Standards intended to be applied together for the management, engineering and product assurance in space projects and applications. ECSS is a cooperative effort of the European Space Agency, national space agencies and European industry associations for the ...
... This Standard is one of the series of ECSS Standards intended to be applied together for the management, engineering and product assurance in space projects and applications. ECSS is a cooperative effort of the European Space Agency, national space agencies and European industry associations for the ...
View
... Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your telescope, so you should keep this manual handy until you have fully mastered your telescope’s operation. The LCM hand control has built-in i ...
... Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your telescope, so you should keep this manual handy until you have fully mastered your telescope’s operation. The LCM hand control has built-in i ...
Galaxies Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015
... A. It would inevitably get sucked into the black hole with no possibility of escape. B. It would detect the gravitational pull of the black hole and be able to go into orbit around it. C. It would be unable to locate the black hole because it’s, well, black. D. It would be repelled by the black hole ...
... A. It would inevitably get sucked into the black hole with no possibility of escape. B. It would detect the gravitational pull of the black hole and be able to go into orbit around it. C. It would be unable to locate the black hole because it’s, well, black. D. It would be repelled by the black hole ...
A Determination of the Deflection of Light by the Sun`s Gravitational
... numberof bright stars in the field, such as would not occur again for many years. With weather conditions as good. as those at Sfax in the 1905 eclipses-and these were by no means perfect-it was anticipated that twelve stars would be shown. Their positions are indicated in the diagram on next page, ...
... numberof bright stars in the field, such as would not occur again for many years. With weather conditions as good. as those at Sfax in the 1905 eclipses-and these were by no means perfect-it was anticipated that twelve stars would be shown. Their positions are indicated in the diagram on next page, ...
The physics and modes of star cluster formation: observations
... hindered by the fact that open clusters are born in molecular clouds and, during their formation and early evolution, are completely embedded in molecular gas and dust. They are thus obscured from view at optical wavelengths, where the traditional astronomical techniques are most effective. Fortunat ...
... hindered by the fact that open clusters are born in molecular clouds and, during their formation and early evolution, are completely embedded in molecular gas and dust. They are thus obscured from view at optical wavelengths, where the traditional astronomical techniques are most effective. Fortunat ...
Galactic Stellar and Substellar Initial Mass Function Invited Review Gilles Chabrier
... ABSTRACT. We review recent determinations of the present-day mass function (PDMF) and initial mass function (IMF) in various components of the Galaxy—disk, spheroid, young, and globular clusters—and in conditions characteristic of early star formation. As a general feature, the IMF is found to depen ...
... ABSTRACT. We review recent determinations of the present-day mass function (PDMF) and initial mass function (IMF) in various components of the Galaxy—disk, spheroid, young, and globular clusters—and in conditions characteristic of early star formation. As a general feature, the IMF is found to depen ...
starry night companion
... “Az” stands for azimuth, an Arabic word (as is altitude) for the position along the horizon; “bearing” is an alternative navigational term. Azimuth is measured in degrees from north, which has an azimuth of 0°, through east (which has an azimuth or a bearing of 90°), through south (180°) and west (2 ...
... “Az” stands for azimuth, an Arabic word (as is altitude) for the position along the horizon; “bearing” is an alternative navigational term. Azimuth is measured in degrees from north, which has an azimuth of 0°, through east (which has an azimuth or a bearing of 90°), through south (180°) and west (2 ...
Tracing the Evolution and Impact of the Stellar Winds
... There is one section not shown in Figure 1.2 that lies between the termination shock and the heliosphere: the heliosheath. In this region, the solar wind becomes turbulent and continues to slow. The next section of the heliosphere is the heliopause. This is the precise boundary where the winds of th ...
... There is one section not shown in Figure 1.2 that lies between the termination shock and the heliosphere: the heliosheath. In this region, the solar wind becomes turbulent and continues to slow. The next section of the heliosphere is the heliopause. This is the precise boundary where the winds of th ...
Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of
... not claim to be an expert in all these fields and I was always grateful to receive constructive comments and corrections on the various topics, which are relevant to this study. Therefore to conduct this study I first had to understand the history of ancient classical astronomy and the main events t ...
... not claim to be an expert in all these fields and I was always grateful to receive constructive comments and corrections on the various topics, which are relevant to this study. Therefore to conduct this study I first had to understand the history of ancient classical astronomy and the main events t ...
Circumstellar dust emission from nearby Solar
... stars (including resolved binaries). These data were previously reduced with older versions of the Herschel software and calibration, and have now been coherently re-reduced with more recent versions. There are 16 new marginal excess sources, and one new detected at δ Pavonis. We find a systematical ...
... stars (including resolved binaries). These data were previously reduced with older versions of the Herschel software and calibration, and have now been coherently re-reduced with more recent versions. There are 16 new marginal excess sources, and one new detected at δ Pavonis. We find a systematical ...
nexstar_gt_60,80114.. - Downloads
... Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your NexStar, so you should keep this manual handy until you have fully mastered your telescope’s operation. The NexStar hand control has built-in ...
... Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your NexStar, so you should keep this manual handy until you have fully mastered your telescope’s operation. The NexStar hand control has built-in ...
Leica ScanStation P-Series HDR
... is precision? Suppose you replace this ruler with a laser range finder. If you measure, or rather call it observe, the same object over and over again, each observation would not be exactly the same, but they would all be very similar. The similarity can be characterised many ways – for example, by ...
... is precision? Suppose you replace this ruler with a laser range finder. If you measure, or rather call it observe, the same object over and over again, each observation would not be exactly the same, but they would all be very similar. The similarity can be characterised many ways – for example, by ...
Alternate Surface Measurements for GMT Primary Mirror
... mounted on the same platform with the laser tracker, which monitor fixed retroreflectors at the edge of the mirror. They measure relative motion along the line of sight and changes in optical path length due to index variations. Some of the light from each of the DMIs is deflected to a position-sens ...
... mounted on the same platform with the laser tracker, which monitor fixed retroreflectors at the edge of the mirror. They measure relative motion along the line of sight and changes in optical path length due to index variations. Some of the light from each of the DMIs is deflected to a position-sens ...
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.