A Hero`s Little Horse: Discovery of a Dissolving Star Cluster in
... elliptical annuli around Kim 1, where r is the elliptical radius. For the center of the overdensity we adopted the centre of mass calculated in terms of the normalised signals on the array into which the stars were binned and smoothed as described in Section 2. We derive an ellipticity = 0.42 ± 0. ...
... elliptical annuli around Kim 1, where r is the elliptical radius. For the center of the overdensity we adopted the centre of mass calculated in terms of the normalised signals on the array into which the stars were binned and smoothed as described in Section 2. We derive an ellipticity = 0.42 ± 0. ...
Module 5 Modelling the universe - Pearson Schools and FE Colleges
... towards themselves than the regions where the density is very low. Given enough time, these areas will very gradually become more dense, and the density will rise at an ever increasing rate until some of the gases in the area become hot enough to glow. This means that they can be detected through te ...
... towards themselves than the regions where the density is very low. Given enough time, these areas will very gradually become more dense, and the density will rise at an ever increasing rate until some of the gases in the area become hot enough to glow. This means that they can be detected through te ...
Preview Sample 2
... travel in 1 year, so traveling this distance in a decade would require a speed of 10% of the speed of light. Astronomers recently discovered a moon that does not orbit a planet. This statement does not make sense because a moon is defined to be an object that orbits a planet. NASA soon plans to laun ...
... travel in 1 year, so traveling this distance in a decade would require a speed of 10% of the speed of light. Astronomers recently discovered a moon that does not orbit a planet. This statement does not make sense because a moon is defined to be an object that orbits a planet. NASA soon plans to laun ...
The Galactic evolution of phosphorus
... stars in globular clusters NGC 6397 and NGC 6752, where it appears to be strongly enhanced, by more than 2 dex and almost 3 dex, respectively. Chemical anomalies in HB stars are usually attributed to diffusion effects, but the current models by Michaud et al. (2008) do not seem to account for more t ...
... stars in globular clusters NGC 6397 and NGC 6752, where it appears to be strongly enhanced, by more than 2 dex and almost 3 dex, respectively. Chemical anomalies in HB stars are usually attributed to diffusion effects, but the current models by Michaud et al. (2008) do not seem to account for more t ...
Sample
... Circumpolar stars are stars that never appear to rise or set from a given location, but are always visible on any clear night. From the North Pole, every visible star is circumpolar, as all circle the horizon at constant altitudes. In contrast, a much smaller portion of the sky is circumpolar from t ...
... Circumpolar stars are stars that never appear to rise or set from a given location, but are always visible on any clear night. From the North Pole, every visible star is circumpolar, as all circle the horizon at constant altitudes. In contrast, a much smaller portion of the sky is circumpolar from t ...
Galaxies - WordPress.com
... A galaxies occasionally collide with one another, particularly within cluster of galaxies B galaxies are so closely packed in the universe that they are always interacting with one another C galaxies are so widely separated that they never interact or collide D the universe is composed of one giant ...
... A galaxies occasionally collide with one another, particularly within cluster of galaxies B galaxies are so closely packed in the universe that they are always interacting with one another C galaxies are so widely separated that they never interact or collide D the universe is composed of one giant ...
Chap4-Timing
... Has a binary companion, a 0.3 M white dwarf in a 191-d low eccentricity orbit. 10 MJ planet orbiting pulsar-WD binary with a~35 AU, P~100 yr. Such a wide companion can survive the dense environment of the cluster (Woolson 2004). Signatures of Newtonian interactionb between planet and WD obs ...
... Has a binary companion, a 0.3 M white dwarf in a 191-d low eccentricity orbit. 10 MJ planet orbiting pulsar-WD binary with a~35 AU, P~100 yr. Such a wide companion can survive the dense environment of the cluster (Woolson 2004). Signatures of Newtonian interactionb between planet and WD obs ...
Lecture 22 - Cosmic distance scale
... As the Earth moves from one side of the Sun to the other, a nearby star will seem to change its position relative to the distant background stars. ...
... As the Earth moves from one side of the Sun to the other, a nearby star will seem to change its position relative to the distant background stars. ...
Powerpoint Presentation (large file)
... observed in a supernova • Explosive helium fusion may occur in the surface layer of a companion neutron star • This produces a sudden increase in X-ray radiation, which we call a burster ...
... observed in a supernova • Explosive helium fusion may occur in the surface layer of a companion neutron star • This produces a sudden increase in X-ray radiation, which we call a burster ...
EF Eri: Its White Dwarf Primary and L Dwarf Secondary
... EF Eri - Summary • EF Eri has just recovered from a nine year low state - the longest known for any polar. • Secondary star line emission started ~7 years in, 1.5 years before new high state. • RV solution yields secondary star mass = 0.055 Msun (fairly insensitive to M1) • Emission lines not irrad ...
... EF Eri - Summary • EF Eri has just recovered from a nine year low state - the longest known for any polar. • Secondary star line emission started ~7 years in, 1.5 years before new high state. • RV solution yields secondary star mass = 0.055 Msun (fairly insensitive to M1) • Emission lines not irrad ...
Age-Dating of Young Stars and Stellar Systems
... low sensitivity of the Rayleigh-Jeans part of the spectrum observed in hot stars (Massey et al. 1995). As a result, optical colors of young hot stars are mostly sensitive to dust reddening rather to age effects. Direct observations of the ionizing continuum of even the closest hot stars are infeasib ...
... low sensitivity of the Rayleigh-Jeans part of the spectrum observed in hot stars (Massey et al. 1995). As a result, optical colors of young hot stars are mostly sensitive to dust reddening rather to age effects. Direct observations of the ionizing continuum of even the closest hot stars are infeasib ...
PHYS3380_110415_bw - The University of Texas at Dallas
... star would blow itself apart. • as the RR Lyrae shrinks and expands, the surface heats up and cools down. -change in brightness accounted for by temperature change • often found in globular clusters - allow better determination of distance and metallicity ...
... star would blow itself apart. • as the RR Lyrae shrinks and expands, the surface heats up and cools down. -change in brightness accounted for by temperature change • often found in globular clusters - allow better determination of distance and metallicity ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.