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. ...
suggested
... light by the interposition of obscure bodies, or aggregations of bodies, invisibly thronging space’’. It was not until the work of Trumpler in 1930 [2] that the first evidence for interstellar reddening was found; which would imply that many stars were cooler than predicted. This reddening has nothin ...
... light by the interposition of obscure bodies, or aggregations of bodies, invisibly thronging space’’. It was not until the work of Trumpler in 1930 [2] that the first evidence for interstellar reddening was found; which would imply that many stars were cooler than predicted. This reddening has nothin ...
Meade® Illuminated Reticle Eyepiece Systems
... advanced amateur. The laser-etched reticle (below) is evenly illuminated by an internal red LED, with illumination intensity variable from bright to faint. Four types of measuring scales are included, for measuring double star angular separations, position angles, planetary diameters, and lunar crat ...
... advanced amateur. The laser-etched reticle (below) is evenly illuminated by an internal red LED, with illumination intensity variable from bright to faint. Four types of measuring scales are included, for measuring double star angular separations, position angles, planetary diameters, and lunar crat ...
Mn, Cu, and Zn abundances in barium stars and their correlations
... intermediate mass AGB stars, and the weak component of the s-process, thought to be sited at He-burning cores of M ≥ 10 M stars (see Raiteri et al. 1993; Matteucci et al. 1993; Mishenina et al. 2002, and references therein). Even though their positions in the periodic table are contiguous, their be ...
... intermediate mass AGB stars, and the weak component of the s-process, thought to be sited at He-burning cores of M ≥ 10 M stars (see Raiteri et al. 1993; Matteucci et al. 1993; Mishenina et al. 2002, and references therein). Even though their positions in the periodic table are contiguous, their be ...
Ch. 20 - Astro1010
... Once all the Galaxy is within an orbit, the Orbital Velocity should diminish with distance, as the dashed curve shows. It doesn’t; more than twice the mass of the Galaxy would have to be outside the visible part to reproduce the observed curve. This mass is called Dark Matter ...
... Once all the Galaxy is within an orbit, the Orbital Velocity should diminish with distance, as the dashed curve shows. It doesn’t; more than twice the mass of the Galaxy would have to be outside the visible part to reproduce the observed curve. This mass is called Dark Matter ...
Calibration with CASA - ASIAA
... • “Calibration” is a process to derive this “G” and recover the true visibility. ALMA User Workshop, Feb 8-10, 2010 ...
... • “Calibration” is a process to derive this “G” and recover the true visibility. ALMA User Workshop, Feb 8-10, 2010 ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... Most bright stars, and several not-so-bright ones, have strangesounding names. Other stars are known merely by letters and numbers. These designations arose in various ways, as follows. A number of star names date back to Greek and Roman times. For example, the name of the brightest star in the sky, ...
... Most bright stars, and several not-so-bright ones, have strangesounding names. Other stars are known merely by letters and numbers. These designations arose in various ways, as follows. A number of star names date back to Greek and Roman times. For example, the name of the brightest star in the sky, ...
Spectral classification of O–M stars on the basis of UBV photometry
... direction. The practice of research of interstellar light absorption (e.g. Urasin et al. 1989) proves that for construction of such a dependence towards the Galactic periphery it is enough to know magnitudes and spectra of stars up to V = 15 mag only. Of course this absorption curve like the one sho ...
... direction. The practice of research of interstellar light absorption (e.g. Urasin et al. 1989) proves that for construction of such a dependence towards the Galactic periphery it is enough to know magnitudes and spectra of stars up to V = 15 mag only. Of course this absorption curve like the one sho ...
9th Conference of Hel.A.S. Athens, 20
... The January 17, 2005 complex radio event (CME- CME interaction) Metric radio bursts and fine structures observed on 20 January, 2005 Combining ground-based and space magnetic measurements for investigating the Earth's magnetosphere Energetic Neutral Atom (ENA) Production from ions trapped in Saturn' ...
... The January 17, 2005 complex radio event (CME- CME interaction) Metric radio bursts and fine structures observed on 20 January, 2005 Combining ground-based and space magnetic measurements for investigating the Earth's magnetosphere Energetic Neutral Atom (ENA) Production from ions trapped in Saturn' ...
A non-LTE analysis of the hot subdwarf O star BD+28°4211
... Heber 2009), the true reason for this relative lack of investigations must be found in the inherent challenge associated with the atmospheric modeling and spectroscopic analyses of very hot stars. For a star with T eff 50 000 K, the fundamental parameters determined by comparing the observed Balmer ...
... Heber 2009), the true reason for this relative lack of investigations must be found in the inherent challenge associated with the atmospheric modeling and spectroscopic analyses of very hot stars. For a star with T eff 50 000 K, the fundamental parameters determined by comparing the observed Balmer ...
Stellar astrophysics based on interferometry
... MIDI: Mid-Infrared (8-13 mm) 2-way beam combiner. Spectral resolution R=30 (prism), R=230 (grism). AMBER: Near-Infrared (J, H, K; 1-2.5 mm) 3-way beam combiner. Spectal resolution R=30 (low resolution), 1500 (medium r.), 12000 (high r.). VLTI instruments and their operation are designed along the sa ...
... MIDI: Mid-Infrared (8-13 mm) 2-way beam combiner. Spectral resolution R=30 (prism), R=230 (grism). AMBER: Near-Infrared (J, H, K; 1-2.5 mm) 3-way beam combiner. Spectal resolution R=30 (low resolution), 1500 (medium r.), 12000 (high r.). VLTI instruments and their operation are designed along the sa ...
G030020-00 - DCC
... orbit such that its closest point to the Sun (or "perihelion") shifts forward with each pass. ...
... orbit such that its closest point to the Sun (or "perihelion") shifts forward with each pass. ...
THE EVOLUTION OF SOLAR FLUX FROM 0.1 nm TO 160μm
... where the scaling parameters α are given in Table 1, but cancel out here, due to the normalization to the modern Sun. It is important to note that Equation (2) is only one part of a competing set of physical process (including strong lines, photospheric models, and a “chromospheric excess”) that wil ...
... where the scaling parameters α are given in Table 1, but cancel out here, due to the normalization to the modern Sun. It is important to note that Equation (2) is only one part of a competing set of physical process (including strong lines, photospheric models, and a “chromospheric excess”) that wil ...
Building` a Galaxy SED
... Practical problem: galaxies are biased tracers of underlying mass distribution. In order to use galaxies to measure underlying mass distribution, we must understand galaxies. ...
... Practical problem: galaxies are biased tracers of underlying mass distribution. In order to use galaxies to measure underlying mass distribution, we must understand galaxies. ...
Rotational Doppler beaming in eclipsing binaries
... stars with no limb darkening (but, see Sect. 3.1) and Eqs. 1 & 2. The two stars are denoted by M1 and M2 with M1 the more massive object, and the mass ratio q = M2 /M1 < 1. Each star is given a blackbody spectrum characterized by the effective temperature Teff . The orbital Doppler beaming has been ...
... stars with no limb darkening (but, see Sect. 3.1) and Eqs. 1 & 2. The two stars are denoted by M1 and M2 with M1 the more massive object, and the mass ratio q = M2 /M1 < 1. Each star is given a blackbody spectrum characterized by the effective temperature Teff . The orbital Doppler beaming has been ...
cassini, rømer and the velocity of light
... depends. They estimated that one would have a fast and secure way to determine longitudes, if one could find in the sky some rapid phenomenon which could be observed at the same time from very distant points on the Earth. This being assumed, comparing with each other the times of observations done s ...
... depends. They estimated that one would have a fast and secure way to determine longitudes, if one could find in the sky some rapid phenomenon which could be observed at the same time from very distant points on the Earth. This being assumed, comparing with each other the times of observations done s ...
ATTENTION: Epreuve non définitive!!!
... Urbain-Jean-Joseph le Verrier explained the unruly behavior of Uranus by positing the existence of an unknown planet, which was subsequently discovered and named Neptune. His father, Louis-Baptiste le Verrier, a civil servant, and mother, Pauline de Baudre, came from the lower Norman aristocracy. Th ...
... Urbain-Jean-Joseph le Verrier explained the unruly behavior of Uranus by positing the existence of an unknown planet, which was subsequently discovered and named Neptune. His father, Louis-Baptiste le Verrier, a civil servant, and mother, Pauline de Baudre, came from the lower Norman aristocracy. Th ...
Tycho Brahe
... • “Let me not be thought to have lived in vain.” • Kepler uses Tycho’s info to produce the 3 laws of planetary motion. ...
... • “Let me not be thought to have lived in vain.” • Kepler uses Tycho’s info to produce the 3 laws of planetary motion. ...
Comets
... the gas glowing due to fluorescence (see below). The inner portion of the coma is the brightest part of a comet. Sometimes this inner coma is symmetric about the nucleus, but more often it is brightest in the direction of the Sun. Spectroscopic analysis of inner comae indicates the existence of comp ...
... the gas glowing due to fluorescence (see below). The inner portion of the coma is the brightest part of a comet. Sometimes this inner coma is symmetric about the nucleus, but more often it is brightest in the direction of the Sun. Spectroscopic analysis of inner comae indicates the existence of comp ...
The Extragalactic Group of MPE and USM
... of Massive Galaxies in the FORS Deep and GOODS South fields • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter lumin ...
... of Massive Galaxies in the FORS Deep and GOODS South fields • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter lumin ...
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.