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The Star-Galaxy Era of Big History in the Light of Universal
... force is insufficient for structuring, because in ‘an absolutely homogenous universe the emergence of large-scale structures (galaxies and their clusters) is impossible’ (Dolgov et al. 1998: 12–13). Thus, certain seed grains are necessary – this is comparable with formation of rain drops that emerge ...
... force is insufficient for structuring, because in ‘an absolutely homogenous universe the emergence of large-scale structures (galaxies and their clusters) is impossible’ (Dolgov et al. 1998: 12–13). Thus, certain seed grains are necessary – this is comparable with formation of rain drops that emerge ...
Table of Contents - Imiloa Astronomy Center
... Deep Sky Objects in Orion: M42; The Orion Nebula: ...
... Deep Sky Objects in Orion: M42; The Orion Nebula: ...
Word Document - Montana State University
... Students plot and analyze NASA data to determine the period of an invisible planet orbiting a wobbling star. In this three-part guided inquiry activity, students first explore the motion of a two-body system around a center of mass to better understand how extra-solar planets are discovered. Student ...
... Students plot and analyze NASA data to determine the period of an invisible planet orbiting a wobbling star. In this three-part guided inquiry activity, students first explore the motion of a two-body system around a center of mass to better understand how extra-solar planets are discovered. Student ...
Mid-IR Observation
... The telescope secondary mirror rocks in a quasi-square wave pattern at a few Hz, displacing the image of the object by typically ~20 arcsec on the detector. This allows the weak emission from the astronomical object to be detected differentially on top of the large thermal background. The mirror pos ...
... The telescope secondary mirror rocks in a quasi-square wave pattern at a few Hz, displacing the image of the object by typically ~20 arcsec on the detector. This allows the weak emission from the astronomical object to be detected differentially on top of the large thermal background. The mirror pos ...
Mergers of massive main sequence binaries
... R stands for rapid), while in case AS systems it can take considerably more time before a contact binary is formed, i.e. on the nuclear timescale of the primary (hence the name AS, where S stands for slow). It will turn out that this difference leads to different compositions of the merger product i ...
... R stands for rapid), while in case AS systems it can take considerably more time before a contact binary is formed, i.e. on the nuclear timescale of the primary (hence the name AS, where S stands for slow). It will turn out that this difference leads to different compositions of the merger product i ...
Power Point - Astronomer`s Proposal Tools Team
... While this issue is important in determining if the object can be used as a guide star, it is not relevant for bright object checking. Failure to do this results in a large number of "unknown" objects appearing in many fields, which then need to be "manually" cleared. Note that an additional step ha ...
... While this issue is important in determining if the object can be used as a guide star, it is not relevant for bright object checking. Failure to do this results in a large number of "unknown" objects appearing in many fields, which then need to be "manually" cleared. Note that an additional step ha ...
PACS Calibration Status and Plans
... - check of internal calibration scheme (robustness against drifts) - check of pointing, raster map and scan map mode parameter selection - decide on final option for some parameter settings - improve AOT design in case of insufficient performance • duration: >60 h • phase: Performance Verification & ...
... - check of internal calibration scheme (robustness against drifts) - check of pointing, raster map and scan map mode parameter selection - decide on final option for some parameter settings - improve AOT design in case of insufficient performance • duration: >60 h • phase: Performance Verification & ...
Harappan Astronomy
... Based on this, we can define the period of the various seasons over the millennia. As can be seen from Figure 4, at the time of the Harappan civilisation, the spring was 94 days long, summer was 90 days long, autumn was 89 days long and winter was 92 days long. However, the seasons in the Indian Sub ...
... Based on this, we can define the period of the various seasons over the millennia. As can be seen from Figure 4, at the time of the Harappan civilisation, the spring was 94 days long, summer was 90 days long, autumn was 89 days long and winter was 92 days long. However, the seasons in the Indian Sub ...
black hole
... The core of helium ash cannot generate nuclear energy. Nevertheless, it can grow hotter—because it contracts and converts gravitational energy into thermal energy. The rising temperature heats the unprocessed hydrogen just outside the core—hydrogen that was never previously hot enough to fuse. ...
... The core of helium ash cannot generate nuclear energy. Nevertheless, it can grow hotter—because it contracts and converts gravitational energy into thermal energy. The rising temperature heats the unprocessed hydrogen just outside the core—hydrogen that was never previously hot enough to fuse. ...
High precision effective temperatures for 181 F-
... K to account for the offset between the canonical Solar temperature of 5777 K and our estimate. The possible reasons for this small discrepancy are discussed below. Another point concerns the difference between the zero-point of our temperature scale and that of other authors. Comparing 30 common ob ...
... K to account for the offset between the canonical Solar temperature of 5777 K and our estimate. The possible reasons for this small discrepancy are discussed below. Another point concerns the difference between the zero-point of our temperature scale and that of other authors. Comparing 30 common ob ...
Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... of the coolest stars (see Fig. 3) in the latter component are heavily affected by titanium oxide (TiO) bands, which severely depress the continuum, in particular in the HR13 spectral range. They were omitted from further analysis. After the first abundance analysis, we found that three stars, attribu ...
... of the coolest stars (see Fig. 3) in the latter component are heavily affected by titanium oxide (TiO) bands, which severely depress the continuum, in particular in the HR13 spectral range. They were omitted from further analysis. After the first abundance analysis, we found that three stars, attribu ...
PH607lec11-4gal2
... The rotation of the galaxy is seen in the emission lines from H alpha at 6563 Angstroms (the brightest line), as well as other fainter lines in this region due to [NII]. HII regions appear reddish in this image because of the prominence of the H alpha line in the red region of the spectrum. The dark ...
... The rotation of the galaxy is seen in the emission lines from H alpha at 6563 Angstroms (the brightest line), as well as other fainter lines in this region due to [NII]. HII regions appear reddish in this image because of the prominence of the H alpha line in the red region of the spectrum. The dark ...
A terrestrial planet candidate in a temperate orbit around Proxima
... 2016. The Doppler data comes from two precision radial velocity instruments, both at the European Southern Observatory (ESO): the High Accuracy Radial velocity Planet Searcher (HARPS) and the Ultraviolet and Visual Echelle Spectrograph (UVES). HARPS is a high-resolution stabilized echelle spectromet ...
... 2016. The Doppler data comes from two precision radial velocity instruments, both at the European Southern Observatory (ESO): the High Accuracy Radial velocity Planet Searcher (HARPS) and the Ultraviolet and Visual Echelle Spectrograph (UVES). HARPS is a high-resolution stabilized echelle spectromet ...
Comparing stars - The Open University
... The H-R diagram in Figure 1 contains too few stars to give us an overall picture. Before we examine a diagram containing many more stars we can speculate on what we might find. Will we find that the stars are fairly uniformly peppered over the diagram, with, for example, as many hot, high luminosity ...
... The H-R diagram in Figure 1 contains too few stars to give us an overall picture. Before we examine a diagram containing many more stars we can speculate on what we might find. Will we find that the stars are fairly uniformly peppered over the diagram, with, for example, as many hot, high luminosity ...
Star 1 A star is a massive, luminous ball of plasma held together by
... increase in the same direction.[28] In addition to his other accomplishments, William Herschel is also noted for his discovery that some stars do not merely lie along the same line of sight, but are also physical companions that form binary star systems. The science of stellar spectroscopy was pione ...
... increase in the same direction.[28] In addition to his other accomplishments, William Herschel is also noted for his discovery that some stars do not merely lie along the same line of sight, but are also physical companions that form binary star systems. The science of stellar spectroscopy was pione ...
CHAPTER 1 The Formation and Structure of Stars
... or molecules in a material—in a hot gas, the atoms move more rapidly than do those in a cool gas. – Although the interstellar clouds are very cold, even at a temperature of only 10 K, the average hydrogen atom moves about 0.5 km/s (1,100 mph). – This thermal motion would make the cloud drift apart i ...
... or molecules in a material—in a hot gas, the atoms move more rapidly than do those in a cool gas. – Although the interstellar clouds are very cold, even at a temperature of only 10 K, the average hydrogen atom moves about 0.5 km/s (1,100 mph). – This thermal motion would make the cloud drift apart i ...
NAS biographical memoir of Martin Schwarzschild
... the pathway to other diffraction-limited instruments, including NASA’s Hubble Space Telescope” and subsequent tools, which have revolutionized observational astronomy. ...
... the pathway to other diffraction-limited instruments, including NASA’s Hubble Space Telescope” and subsequent tools, which have revolutionized observational astronomy. ...
Statistical properties of a sample of periodically variable B-type supergiants ⋆
... Waelkens et al. (1998) positioned the new periodic B supergiants in the HR diagram on the basis of multicolour photometric calibrations (accurate parallaxes are not available) and found them to be situated between the SPBs and previously known α Cyg-type variables (see their Fig. 2). Oscillations we ...
... Waelkens et al. (1998) positioned the new periodic B supergiants in the HR diagram on the basis of multicolour photometric calibrations (accurate parallaxes are not available) and found them to be situated between the SPBs and previously known α Cyg-type variables (see their Fig. 2). Oscillations we ...
File
... • due on-going star formation, ages of stars widely range from age of galaxy to new • spiral arms form as sustained density waves; where majority of star formation occurs ...
... • due on-going star formation, ages of stars widely range from age of galaxy to new • spiral arms form as sustained density waves; where majority of star formation occurs ...
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... There is a significant Charge Transfer Efficiency (CTE) effect for all CCD detectors used in HST instruments; WFPC2: Dolphin (2000), STIS: Goudfrooij et al.(2006), ACS: Riess & Mack (2004), where the CTE effect was discussed in the terms of CTE-induced photometric losses in aperture photometry. Howe ...
... There is a significant Charge Transfer Efficiency (CTE) effect for all CCD detectors used in HST instruments; WFPC2: Dolphin (2000), STIS: Goudfrooij et al.(2006), ACS: Riess & Mack (2004), where the CTE effect was discussed in the terms of CTE-induced photometric losses in aperture photometry. Howe ...
Hipparcos
![](https://commons.wikimedia.org/wiki/Special:FilePath/Hipparcos-testing-estec.jpg?width=300)
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.