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OCO-2 Data to Lead Scientists Forward into the Past
... Mars at dusk is still slightly less than 3° (two finger widths at arm's length) from Spica in the southwestern sky. But they're widening and sinking lower day by day. Sunday, July 20 In a 6- or 8-inch telescope, globular star clusters are among the most beautiful objects in the night and certainly a ...
... Mars at dusk is still slightly less than 3° (two finger widths at arm's length) from Spica in the southwestern sky. But they're widening and sinking lower day by day. Sunday, July 20 In a 6- or 8-inch telescope, globular star clusters are among the most beautiful objects in the night and certainly a ...
Markov Chain Monte Carlo Modeling of High-Redshift Quasar
... Quasars, the visible phenomena associated with the active accretion phase of supermassive black holes found in the centers of galaxies, represent one of the most energetic processes in the Universe. As matter falls into the central black hole, it is accelerated and collisionally heated, and the radi ...
... Quasars, the visible phenomena associated with the active accretion phase of supermassive black holes found in the centers of galaxies, represent one of the most energetic processes in the Universe. As matter falls into the central black hole, it is accelerated and collisionally heated, and the radi ...
Variations in the Star Formation Efficiency of the Dense Molecular
... local variables related to the physical state of the interstellar medium (ISM), for example stellar and gas surface density, interstellar radiation field, and so on. A particular emphasis of our survey is to study the disks (not just the centers) of star-forming galaxies, and so our observations spa ...
... local variables related to the physical state of the interstellar medium (ISM), for example stellar and gas surface density, interstellar radiation field, and so on. A particular emphasis of our survey is to study the disks (not just the centers) of star-forming galaxies, and so our observations spa ...
variation in the pre-transit balmer line signal around
... As followup to our recent detection of a pre-transit signal around HD 189733 b, we obtained full pre-transit phase coverage of a single planetary transit. The pre-transit signal is again detected in the Balmer lines but with variable strength and timing, suggesting that the bow shock geometry report ...
... As followup to our recent detection of a pre-transit signal around HD 189733 b, we obtained full pre-transit phase coverage of a single planetary transit. The pre-transit signal is again detected in the Balmer lines but with variable strength and timing, suggesting that the bow shock geometry report ...
Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... Homogeneous abundances of light elements, α-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 re ...
... Homogeneous abundances of light elements, α-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 re ...
SCA Laser Collimator for SCT
... even though star testing would indicate perfect collimation. In addition, the secondary mirror, convex shape, magnifies any error by about 5 times. The error of deviation for a typical well collimated SCT will return laser beam at around 0.125" to 0.250" off center. In order to compensate the mechan ...
... even though star testing would indicate perfect collimation. In addition, the secondary mirror, convex shape, magnifies any error by about 5 times. The error of deviation for a typical well collimated SCT will return laser beam at around 0.125" to 0.250" off center. In order to compensate the mechan ...
Sec 30.1 - Highland High School
... orbiting the center of the Milky Way, astronomers then used RR Lyrae variables to determine the distances to them. ...
... orbiting the center of the Milky Way, astronomers then used RR Lyrae variables to determine the distances to them. ...
Detection of Earth-impacting asteroids with the next generation all
... The impactor and NEO orbit distributions have already been discussed briefly above and in detail by Chesley & Spahr (2004). The differences between the impactor population and the fireballs are perhaps more interesting where it is important to keep in mind that the comparison in Fig. 1 is between th ...
... The impactor and NEO orbit distributions have already been discussed briefly above and in detail by Chesley & Spahr (2004). The differences between the impactor population and the fireballs are perhaps more interesting where it is important to keep in mind that the comparison in Fig. 1 is between th ...
Silicon isotopic abundance toward evolved stars and its application
... has not significantly changed in the past 4.6 Gyr when the Sun was born. In comparison, VY CMa and IRC+10216 were born ∼107 and 1−5 × 108 years ago, assuming masses of 25−32 and 3−5 M , respectively (see Portinari et al. 1998). We found stars that we believe to be significantly older than the Sun, ...
... has not significantly changed in the past 4.6 Gyr when the Sun was born. In comparison, VY CMa and IRC+10216 were born ∼107 and 1−5 × 108 years ago, assuming masses of 25−32 and 3−5 M , respectively (see Portinari et al. 1998). We found stars that we believe to be significantly older than the Sun, ...
T3-Cosmic Star Formation History
... Stadel et al. 2009; Klypin et al. 2011). However, the same does not hold for the baryons. Several complex processes are still poorly understood, for example, baryonic dissipation inside evolving CDM halos, the transformation of cold gas into stars, the formation of disks and spheroids, the chemical ...
... Stadel et al. 2009; Klypin et al. 2011). However, the same does not hold for the baryons. Several complex processes are still poorly understood, for example, baryonic dissipation inside evolving CDM halos, the transformation of cold gas into stars, the formation of disks and spheroids, the chemical ...
COMETS
... metric tons of water per second in late March. By April these values dropped to 900 and 80 metric tons, respectively. The density of Hale-Bopp’s coma was roughly one small dust particle per cubic centimeter. For most comets, stars can be seen through the tails and their light is dimmed in the coma o ...
... metric tons of water per second in late March. By April these values dropped to 900 and 80 metric tons, respectively. The density of Hale-Bopp’s coma was roughly one small dust particle per cubic centimeter. For most comets, stars can be seen through the tails and their light is dimmed in the coma o ...
Preface
... Dust exists everywhere—in inter- and circum-planetary, inter- and circum-stellar, and even intergalactic, space—since its first creation in the Universe. The first generation of cosmic dust must have been produced less than 1 Gyr after the Big Bang, for the reason that more than 108 solar masses of ...
... Dust exists everywhere—in inter- and circum-planetary, inter- and circum-stellar, and even intergalactic, space—since its first creation in the Universe. The first generation of cosmic dust must have been produced less than 1 Gyr after the Big Bang, for the reason that more than 108 solar masses of ...
Powerpoint - Brown University
... –During normal operations, the spacecraft body axes are controlled to the target coordinate frame –The orientation of this frame relative to the orbital frame is defined by the enabled pointing offsets • Constant • Earth-target • Fourier ...
... –During normal operations, the spacecraft body axes are controlled to the target coordinate frame –The orientation of this frame relative to the orbital frame is defined by the enabled pointing offsets • Constant • Earth-target • Fourier ...
Habitable Zone Lifetimes of Exoplanets around Main Sequence Stars
... transition rates to return a HZ lifetime estimate. Additionally, we focus on stellar-based HZ estimations because they can provide a certain degree of observability that other parameterizations cannot; direct measurements of stellar luminosity can be made, and theories regarding stellar evolution an ...
... transition rates to return a HZ lifetime estimate. Additionally, we focus on stellar-based HZ estimations because they can provide a certain degree of observability that other parameterizations cannot; direct measurements of stellar luminosity can be made, and theories regarding stellar evolution an ...
Astronomy
... Astronomy is a natural science that deals with the study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics, chem ...
... Astronomy is a natural science that deals with the study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics, chem ...
THE VELOCITY DISTRIBUTION OF THE NEAREST
... Mg+, D0, and H0 are available for several stars in the downwind direction and toward the north Galactic pole (where column densities are also low). The component sample results primarily from fits to optical and UV absorption lines observed at relatively high resolution (<3 km s1); medium-resolution ...
... Mg+, D0, and H0 are available for several stars in the downwind direction and toward the north Galactic pole (where column densities are also low). The component sample results primarily from fits to optical and UV absorption lines observed at relatively high resolution (<3 km s1); medium-resolution ...
preprint, pdf version - LESIA
... The analysis of light curves obtained for a stellar occultation observed from many sites allows the shapes and sizes of TNOs to be measured with a precision of a few kilometers. We can probe their atmospheres or place limits on their existence down to the nanobar level. In addition, occultations can ...
... The analysis of light curves obtained for a stellar occultation observed from many sites allows the shapes and sizes of TNOs to be measured with a precision of a few kilometers. We can probe their atmospheres or place limits on their existence down to the nanobar level. In addition, occultations can ...
Principles, Limitations and Performance of Multi
... The very crude analytical approach proposed above seem to describe quite well the amplitude of the generalized tting error, at least for this kind of systems. An arbitrary limit to h when designing a MCAO system is to have both terms of Eq 3 balanced (classical tting and generalized tting erro ...
... The very crude analytical approach proposed above seem to describe quite well the amplitude of the generalized tting error, at least for this kind of systems. An arbitrary limit to h when designing a MCAO system is to have both terms of Eq 3 balanced (classical tting and generalized tting erro ...
Document
... Atmospheric seeing (about 1-2 arcseconds on average). How can one overcome the atmospheric limitation in optical? 1) By using adaptive optics 2) By using interferometry 3) By putting a telescope in space (HST) ...
... Atmospheric seeing (about 1-2 arcseconds on average). How can one overcome the atmospheric limitation in optical? 1) By using adaptive optics 2) By using interferometry 3) By putting a telescope in space (HST) ...
Rocky planetesimals as the origin of metals in DZ stars
... debris (Gänsicke et al. 2008; Farihi, Jura & Zuckerman 2009; Jura, Farihi & Zuckerman 2009a). Thus, while there is firm observational evidence of pollution via circumstellar material, as yet there is none favouring the ISM. Aannestad et al. (1993) provided an extensive spatial, kinematical and calc ...
... debris (Gänsicke et al. 2008; Farihi, Jura & Zuckerman 2009; Jura, Farihi & Zuckerman 2009a). Thus, while there is firm observational evidence of pollution via circumstellar material, as yet there is none favouring the ISM. Aannestad et al. (1993) provided an extensive spatial, kinematical and calc ...
here - NASA/IPAC Extragalactic Database
... line, we call the O star an “Of-type”, with the implication that the star is of luminosity class “I”. (The actual system is a bit more complicated than this; see, e.g., Sota et al. 2011.) The NIII emission behavior has finally been demonstrated to be dependent on stellar wind strengths, although nit ...
... line, we call the O star an “Of-type”, with the implication that the star is of luminosity class “I”. (The actual system is a bit more complicated than this; see, e.g., Sota et al. 2011.) The NIII emission behavior has finally been demonstrated to be dependent on stellar wind strengths, although nit ...
Recen t Scien ti c
... a pulsar in the Supernova Remnant 3C58, and studies of X-ray emission from the nearby AGN Centaurus A. ...
... a pulsar in the Supernova Remnant 3C58, and studies of X-ray emission from the nearby AGN Centaurus A. ...
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.