Europium, Samarium, and Neodymium Isotopic Fractions in Metal
... exhibits radial velocity variations (Lucatello et al. 2005), indicating that it is a member of a binary or multiple star system. These characteristics have led to the classification of HD 196944 as a carbon-enhanced metal-poor senriched (CEMP-s) star, as defined in Beers & Christlieb (2005). Gallino ...
... exhibits radial velocity variations (Lucatello et al. 2005), indicating that it is a member of a binary or multiple star system. These characteristics have led to the classification of HD 196944 as a carbon-enhanced metal-poor senriched (CEMP-s) star, as defined in Beers & Christlieb (2005). Gallino ...
X-ray astronomy of stellar coronae (Review)
... not mentioned. The high-quality images of the full-disk Sun in X-rays formed, together with data from previous rocket flights, our modern picture of the solar and therefore stellar coronae. The solar X-ray corona is now understood as a dynamic ensemble of magnetic loops that contain hot plasma in ev ...
... not mentioned. The high-quality images of the full-disk Sun in X-rays formed, together with data from previous rocket flights, our modern picture of the solar and therefore stellar coronae. The solar X-ray corona is now understood as a dynamic ensemble of magnetic loops that contain hot plasma in ev ...
Here - NASA/IPAC Extragalactic Database
... at which one is working). The effective temperatures T? of the ionizing stars lie in the range 35 000 – 50 000 K. The nebular geometries result from the structure of the parent molecular cloud. Stellar winds, at evolved stages, may produce ring-like structures, but the morphology of H ii regions is ...
... at which one is working). The effective temperatures T? of the ionizing stars lie in the range 35 000 – 50 000 K. The nebular geometries result from the structure of the parent molecular cloud. Stellar winds, at evolved stages, may produce ring-like structures, but the morphology of H ii regions is ...
Gamma-Ray Bursts and Puzzles of Core
... The SN 2006aj spectrum in rest wavelengths obtained with BTA in 2.55 days after XRF/GRB 060218 corrected for galactic extinction. The fitting by synthetic (SYNOW: D.Branch et al., 2001, A.Elmhamdi et al., 2006) spectra with the velocity of the photosphere (V ), all elements and their ions ...
... The SN 2006aj spectrum in rest wavelengths obtained with BTA in 2.55 days after XRF/GRB 060218 corrected for galactic extinction. The fitting by synthetic (SYNOW: D.Branch et al., 2001, A.Elmhamdi et al., 2006) spectra with the velocity of the photosphere (V ), all elements and their ions ...
probing quasar environments with tunable filter
... MRC B1256-243 lack the sensitivity to probe deep into the quasar environment, but detect a number of extremely luminous objects. In BR B0019-1522, we show convincing evidence of a protocluster, including both galaxy and star formation rate densities an order of magnitude higher than that observed in ...
... MRC B1256-243 lack the sensitivity to probe deep into the quasar environment, but detect a number of extremely luminous objects. In BR B0019-1522, we show convincing evidence of a protocluster, including both galaxy and star formation rate densities an order of magnitude higher than that observed in ...
FY96
... major common motion groups. The consequence is that the halo is dynamically young, with comingling but identifiable streams of stars of different ages, metallicities and trajectories, presumably from capture of satellite systems by the Milky Way. This "can of worms" model for the halo may explain se ...
... major common motion groups. The consequence is that the halo is dynamically young, with comingling but identifiable streams of stars of different ages, metallicities and trajectories, presumably from capture of satellite systems by the Milky Way. This "can of worms" model for the halo may explain se ...
Astronomy Edexcel GCSE in Astronomy (2AS01)
... Students will be assessed on their ability to: a describe the location and nature of the main constituents of our Solar System, including planets, dwarf planets, asteroids, comets, centaurs and Trans-Neptunian Objects (TNOs) b recall the names of planets and dwarf planets in order of their mean dist ...
... Students will be assessed on their ability to: a describe the location and nature of the main constituents of our Solar System, including planets, dwarf planets, asteroids, comets, centaurs and Trans-Neptunian Objects (TNOs) b recall the names of planets and dwarf planets in order of their mean dist ...
OBSERVATIONS OF PHYSICAL PROCESSES IN
... though they are expected in a cool core with radio emission. We simulate X-ray images with various bubble configurations and sizes to set limits on what we could have missed in the data. We analyze narrow band Hα imaging and optical spectra and find elongation of the Hα filaments along the same east ...
... though they are expected in a cool core with radio emission. We simulate X-ray images with various bubble configurations and sizes to set limits on what we could have missed in the data. We analyze narrow band Hα imaging and optical spectra and find elongation of the Hα filaments along the same east ...
Aalborg Universitet Spacecraft Attitude Determination with Earth Albedo Corrected Sun Sensor Measurements
... attitude determination. Since the recent development of the CubeSat pico-satellite concept, numerous universities have initiated student satellite projects. The minimal size of the CubeSats limits the hardware configuration, which, for an attitude determination point-of-view, only allows simple atti ...
... attitude determination. Since the recent development of the CubeSat pico-satellite concept, numerous universities have initiated student satellite projects. The minimal size of the CubeSats limits the hardware configuration, which, for an attitude determination point-of-view, only allows simple atti ...
148 Jun - British Astronomical Association
... cloud of dust and gas that partially obscures epsilon. Egress was interrupted by a denser part of the disk which may suggest a ring structure. Professionals involved in the international observing campaign have requested that observations (visual) and measurements (CCD / DSLR photometry) continue fo ...
... cloud of dust and gas that partially obscures epsilon. Egress was interrupted by a denser part of the disk which may suggest a ring structure. Professionals involved in the international observing campaign have requested that observations (visual) and measurements (CCD / DSLR photometry) continue fo ...
SPICA Yellow Book
... of distant galaxies; however, its relatively warm telescope (between 82 and 90 K) greatly limits its sensitivity. A new much more sensitive mission reaching must therefore build on the work started by Herschel and gain a deeper understanding of the physics of the objects discovered there: i.e., to s ...
... of distant galaxies; however, its relatively warm telescope (between 82 and 90 K) greatly limits its sensitivity. A new much more sensitive mission reaching must therefore build on the work started by Herschel and gain a deeper understanding of the physics of the objects discovered there: i.e., to s ...
Chapter 10 Formation and evolution of the Local Group
... diameter of ∼3 Mpc having a total mass of 2-5 × 1012 M⊙ . A strong morphologydensity relation exists in which gas-poor dwarf spheroidals (dSphs) are preferentially found closer to the Galaxy/M 31 than gas-rich dwarf irregulars (dIrrs). This is often promoted as evidence of environmental processes du ...
... diameter of ∼3 Mpc having a total mass of 2-5 × 1012 M⊙ . A strong morphologydensity relation exists in which gas-poor dwarf spheroidals (dSphs) are preferentially found closer to the Galaxy/M 31 than gas-rich dwarf irregulars (dIrrs). This is often promoted as evidence of environmental processes du ...
constellations - Richmond and Glen Allen Weather
... even the bright sun is dimmed toward one’s horizon at setting or rising. The apparent magnitude difference from the zenith to the horizon is approximately two magnitudes dimmer in brightness. 2. The least desirable time to observe the constellations is when the moon, brighter than a quarter phase, i ...
... even the bright sun is dimmed toward one’s horizon at setting or rising. The apparent magnitude difference from the zenith to the horizon is approximately two magnitudes dimmer in brightness. 2. The least desirable time to observe the constellations is when the moon, brighter than a quarter phase, i ...
Annual Report 2011 - Max Planck Institute for Astrophysics
... development of a distributed processing system to be used as the backbone both for simulation of the mission and later for the data analysis itself. The mission simulation package was mainly developed at MPA and is still maintained here. MPA directly supports the operation of the Trieste data centre ...
... development of a distributed processing system to be used as the backbone both for simulation of the mission and later for the data analysis itself. The mission simulation package was mainly developed at MPA and is still maintained here. MPA directly supports the operation of the Trieste data centre ...
harlow shapley - National Academy of Sciences
... to be taken, which were used for the discovery of new shortperiod variable stars. A careful measurement of the apparent brightness of every variable star on a photograph had to be performed, and the period of light variation and median apparent magnitude for every star of interest had to be determin ...
... to be taken, which were used for the discovery of new shortperiod variable stars. A careful measurement of the apparent brightness of every variable star on a photograph had to be performed, and the period of light variation and median apparent magnitude for every star of interest had to be determin ...
Lab 14 Galaxy Morphology
... glowing hydrogen gas within the Milky Way galaxy (HII regions), others (some of which resembled pinwheels) were true galaxies–similar to the Milky Way in size and structure, but millions of light years from us. It was not until the 1920’s that the actual nature of galaxies was confirmed–they were tr ...
... glowing hydrogen gas within the Milky Way galaxy (HII regions), others (some of which resembled pinwheels) were true galaxies–similar to the Milky Way in size and structure, but millions of light years from us. It was not until the 1920’s that the actual nature of galaxies was confirmed–they were tr ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... The Urantia Book is probably referring here to the Hale (Mt Palomar) telescope, which went into operation in 1948. The figure 375 million thus refers to the additional new galaxies observable when the Hale telescope was put into operation, not the number of galaxies in the master universe. Recently ...
... The Urantia Book is probably referring here to the Hale (Mt Palomar) telescope, which went into operation in 1948. The figure 375 million thus refers to the additional new galaxies observable when the Hale telescope was put into operation, not the number of galaxies in the master universe. Recently ...
Spacecraft Navigation Using X-Ray Pulsars
... and with their faint emissions, radio-based systems would require large antennas (on the order of 25 m in diameter or larger) to detect sources, which would be impractical for most spacecraft. Also, neighboring celestial objects including the sun, moon, Jupiter, and close stars, as well as distance ...
... and with their faint emissions, radio-based systems would require large antennas (on the order of 25 m in diameter or larger) to detect sources, which would be impractical for most spacecraft. Also, neighboring celestial objects including the sun, moon, Jupiter, and close stars, as well as distance ...
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.