SEI Structure Development - LIGO
... Prototype cost basis for optical lever receiver and Hartmann sensors Engineering cost estimate for TCS ring heaters PO mirror suspension engineering estimate based on quad SUS prototype * For LIGO estimating, contingency was first estimated using a standard qualitative process to assign risk factors ...
... Prototype cost basis for optical lever receiver and Hartmann sensors Engineering cost estimate for TCS ring heaters PO mirror suspension engineering estimate based on quad SUS prototype * For LIGO estimating, contingency was first estimated using a standard qualitative process to assign risk factors ...
The spectroscopic Hertzsprung
... stars that have a luminosity larger than the luminosity of a single star of comparable mass and evolutionary state. Kippenhahn & Weigert (1990) showed that main sequence stars are expected to obey the relation L ∼ M α µβ , where µ is the average mean molecular weight and β > 1. An overluminosity is ...
... stars that have a luminosity larger than the luminosity of a single star of comparable mass and evolutionary state. Kippenhahn & Weigert (1990) showed that main sequence stars are expected to obey the relation L ∼ M α µβ , where µ is the average mean molecular weight and β > 1. An overluminosity is ...
Classification of Variable Stars
... V1668 Cyg. These are stars in constellations for which all of the letter combinations have been exhausted. (i.e. V746 Oph is the 746th variable to be discovered in Ophiuchus.) Variable star names are determined by a committee appointed by the International Astronomical Union (I.A.U.). The assignment ...
... V1668 Cyg. These are stars in constellations for which all of the letter combinations have been exhausted. (i.e. V746 Oph is the 746th variable to be discovered in Ophiuchus.) Variable star names are determined by a committee appointed by the International Astronomical Union (I.A.U.). The assignment ...
The environment of high-redshift AGN OLIMPIA JUDIT FOGASY
... 1967; Steidel et al. 1995). As young stars emit mostly UV light and photons with energies higher than the ionization energy of hydrogen are easily absorbed by neutral gas around star-forming regions, a break can be observed in the spectral energy distribution (SED) of the galaxy at 91.2 nm rest-fram ...
... 1967; Steidel et al. 1995). As young stars emit mostly UV light and photons with energies higher than the ionization energy of hydrogen are easily absorbed by neutral gas around star-forming regions, a break can be observed in the spectral energy distribution (SED) of the galaxy at 91.2 nm rest-fram ...
Cool Stars in the Galaxy — A ROSAT and ASCA View.
... This thesis deals mainly with emission from stellar sources, however an understanding of the solar corona is useful when considering the stellar equivalents. Figure 1.1 shows a soft X-ray image of the solar corona obtained using the Japanese Yohkoh satellite. The bright regions are active (emit in t ...
... This thesis deals mainly with emission from stellar sources, however an understanding of the solar corona is useful when considering the stellar equivalents. Figure 1.1 shows a soft X-ray image of the solar corona obtained using the Japanese Yohkoh satellite. The bright regions are active (emit in t ...
A Spitzer mid-infrared spectral survey of mass
... K , M K ) ∼ (1, −10.7) in Fig. 1(b) was not a target but was accidentally observed when Spitzer selected it in the peak-up field.] It turns out that only two of the LMC sources were oxygen-rich, one of which was found to be a massive young stellar object (van Loon et al. 2005b). Here we present the ...
... K , M K ) ∼ (1, −10.7) in Fig. 1(b) was not a target but was accidentally observed when Spitzer selected it in the peak-up field.] It turns out that only two of the LMC sources were oxygen-rich, one of which was found to be a massive young stellar object (van Loon et al. 2005b). Here we present the ...
Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
... The observing facilities to which we had access imposed two additional criteria on our sample: 3. An apparent size smaller than 30 , possible to image by both facilities used for this work. 4. Target visibility from each facility during the observing time granted. We identified 34 dwarf galaxies th ...
... The observing facilities to which we had access imposed two additional criteria on our sample: 3. An apparent size smaller than 30 , possible to image by both facilities used for this work. 4. Target visibility from each facility during the observing time granted. We identified 34 dwarf galaxies th ...
Clusters: age scales for stellar physics
... imposed some limits since it was already known that Earth was much older, and the energy emission rate of the Sun was therefore not sustainable. Therefore, some new mechanism laid behind. What physicists did not know was that complete new branch of physics was at hand: relativity and quantum mechani ...
... imposed some limits since it was already known that Earth was much older, and the energy emission rate of the Sun was therefore not sustainable. Therefore, some new mechanism laid behind. What physicists did not know was that complete new branch of physics was at hand: relativity and quantum mechani ...
New brown dwarfs and giant planets
... • Finding ultracool dwarfs • The L dwarf sequence extending calibration to near-infrared wavelengths • L-dwarf binaries Separations and mass ratios • The mass function below the hydrogen-burning limit brown dwarfs and dark matter Some results and a conundrum • Heavy halo white dwarfs? ...
... • Finding ultracool dwarfs • The L dwarf sequence extending calibration to near-infrared wavelengths • L-dwarf binaries Separations and mass ratios • The mass function below the hydrogen-burning limit brown dwarfs and dark matter Some results and a conundrum • Heavy halo white dwarfs? ...
Starspots: A Key to the Stellar Dynamo | SpringerLink
... tests of solar dynamo models. Using only solar observations limits the range of the global stellar parameters for such tests, while an extensive sample of stars of various activity levels provides key constraints for stellar and solar dynamo theory. Stellar activity similar to that of the Sun was fi ...
... tests of solar dynamo models. Using only solar observations limits the range of the global stellar parameters for such tests, while an extensive sample of stars of various activity levels provides key constraints for stellar and solar dynamo theory. Stellar activity similar to that of the Sun was fi ...
Introduction
... The observed K-band luminosity function of galaxies in the local Universe compared to theoretical predictions, with and without AGN feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The sky distribution of the HRS+ galaxies, with a magnified view of the Virgo cluster r ...
... The observed K-band luminosity function of galaxies in the local Universe compared to theoretical predictions, with and without AGN feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The sky distribution of the HRS+ galaxies, with a magnified view of the Virgo cluster r ...
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 ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... "Your world, Urantia, is one of many similar inhabited planets which comprise the local universe of Nebadon. This universe, together with similar creations, makes up the superuniverse of Orvonton, from whose capital, Uversa, our commission hails. Orvonton is one of the seven evolutionary superuniver ...
... "Your world, Urantia, is one of many similar inhabited planets which comprise the local universe of Nebadon. This universe, together with similar creations, makes up the superuniverse of Orvonton, from whose capital, Uversa, our commission hails. Orvonton is one of the seven evolutionary superuniver ...
WAS THE SUN BORN IN A MASSIVE CLUSTER?
... A number of authors have argued that the Sun must have been born in a cluster of no more than several thousand stars, on the basis that, in a larger cluster, close encounters between the Sun and other stars would have truncated the outer solar system or excited the outer planets into eccentric orbit ...
... A number of authors have argued that the Sun must have been born in a cluster of no more than several thousand stars, on the basis that, in a larger cluster, close encounters between the Sun and other stars would have truncated the outer solar system or excited the outer planets into eccentric orbit ...
Origami Sunshield Concepts for Space Telescopes Lee Wilson and Sergio Pellegrino Rolf Danner
... There were two primary constraints in developing these solutions. The first constraint was the folded sunshield had to fit within the envelope defined by the rocket fairing and the telescope. The second constraint was that during deployment the sunshield must not interfere with the telescope, althou ...
... There were two primary constraints in developing these solutions. The first constraint was the folded sunshield had to fit within the envelope defined by the rocket fairing and the telescope. The second constraint was that during deployment the sunshield must not interfere with the telescope, althou ...
Multiwavelength observations of XTE J1118+480`s outburst
... ISGRI localisation not enough to identify the counterpart ...
... ISGRI localisation not enough to identify the counterpart ...
The redshift of extragalactic nebulae
... first tried to connect the red-shift to the apparent concentration of the nebulae. He started from the idea that the redshift correlated with the famous Einstein effect. It appeared, however, that it was not possible in this way to uncover rational relationships. E. HUBBLE then tried to correlate th ...
... first tried to connect the red-shift to the apparent concentration of the nebulae. He started from the idea that the redshift correlated with the famous Einstein effect. It appeared, however, that it was not possible in this way to uncover rational relationships. E. HUBBLE then tried to correlate th ...
Stellarium User Guide
... planetarium. It calculates the positions of the Sun and Moon, planets and stars, and draws how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. It c ...
... planetarium. It calculates the positions of the Sun and Moon, planets and stars, and draws how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. It c ...
Astro Review - Parkway C-2
... main-sequence star. It will remain a main-sequence star until it depletes the store of hydrogen fuel in its core. Then, it will become a red giant and consume hydrogen in its outer shell and helium in its core. When all nuclear fuel is consumed, the sun will cast off its outer layer, creating a plan ...
... main-sequence star. It will remain a main-sequence star until it depletes the store of hydrogen fuel in its core. Then, it will become a red giant and consume hydrogen in its outer shell and helium in its core. When all nuclear fuel is consumed, the sun will cast off its outer layer, creating a plan ...
The Solar System and Beyond
... This book summarizes the results of ISSI Workshop projects in a number of scientific areas, to which they have made important contributions, but we do not claim any completeness. There are two parts to the volume: Part A contains essays relating to the evolution and scientific goals of ISSI, while t ...
... This book summarizes the results of ISSI Workshop projects in a number of scientific areas, to which they have made important contributions, but we do not claim any completeness. There are two parts to the volume: Part A contains essays relating to the evolution and scientific goals of ISSI, while t ...
Galaxy Evolution
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
Galaxy Evolution Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mauro Giavalisco
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
p of the Sky
... brighter than the Moon If in M42 (Orion nebula) brighter than the Sun! Egamma > 104x Evisible ...
... brighter than the Moon If in M42 (Orion nebula) brighter than the Sun! Egamma > 104x Evisible ...
International Ultraviolet Explorer
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.