STAR MAKER Olaf Stapledon
... ceiling and floor, but as depth beyond flashing depth of suns. And though for the most part the great and familiar lights of the sky stood forth as our near neighbors, some brilliant stars were seen to be in fact remote and mighty, while some dim lamps were visible only because they were so near. On ...
... ceiling and floor, but as depth beyond flashing depth of suns. And though for the most part the great and familiar lights of the sky stood forth as our near neighbors, some brilliant stars were seen to be in fact remote and mighty, while some dim lamps were visible only because they were so near. On ...
The Milky Way`s Restless Swarms of Stars
... of neutron stars or the event horizon of a sizable black hole at the center of it all. There’s just one problem: Such a planet almost certainly doesn’t exist. Stars in the hearts of globular clusters interact so closely and so frequently, in astronomical terms, that planetary systems can’t survive t ...
... of neutron stars or the event horizon of a sizable black hole at the center of it all. There’s just one problem: Such a planet almost certainly doesn’t exist. Stars in the hearts of globular clusters interact so closely and so frequently, in astronomical terms, that planetary systems can’t survive t ...
Three Coordinate Systems
... Location of prime meridian is arbitrary = Greenwich observatory in UK 1 minute of longitude = 1 nautical mile * cosine(latitude) Lines of longitude converge at the north and south poles To find longitude typically requires a clock, although there is a technique, called the lunar method that relies o ...
... Location of prime meridian is arbitrary = Greenwich observatory in UK 1 minute of longitude = 1 nautical mile * cosine(latitude) Lines of longitude converge at the north and south poles To find longitude typically requires a clock, although there is a technique, called the lunar method that relies o ...
H2CO and CO in S140
... absorption is clearly separated by a full 10' (~ 3 pc) from the CO peak. This CO peak is nearly coincident with the H arc S140. From a consideration of a different sensitivities of H2CO and CO to local excitation conditions, we conclude that the CO emission in this region is bright because of local ...
... absorption is clearly separated by a full 10' (~ 3 pc) from the CO peak. This CO peak is nearly coincident with the H arc S140. From a consideration of a different sensitivities of H2CO and CO to local excitation conditions, we conclude that the CO emission in this region is bright because of local ...
Three Coordinate Systems
... Location of prime meridian is arbitrary = Greenwich observatory in UK 1 minute of longitude = 1 nautical mile * cosine(latitude) Lines of longitude converge at the north and south poles To find longitude typically requires a clock, although there is a technique, called the lunar method that relies o ...
... Location of prime meridian is arbitrary = Greenwich observatory in UK 1 minute of longitude = 1 nautical mile * cosine(latitude) Lines of longitude converge at the north and south poles To find longitude typically requires a clock, although there is a technique, called the lunar method that relies o ...
Astronomy - Career Account Web Pages
... the deepest infrared image taken of the universe. Based on the object's color, astronomers believe it is 13.2 billion light-years away. The most distant objects in the universe appear extremely red because their light is stretched to longer, redder wavelengths by the expansion of the universe. This ...
... the deepest infrared image taken of the universe. Based on the object's color, astronomers believe it is 13.2 billion light-years away. The most distant objects in the universe appear extremely red because their light is stretched to longer, redder wavelengths by the expansion of the universe. This ...
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman
... Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a variable corona (Wheatley et al. 2017), this ...
... Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a variable corona (Wheatley et al. 2017), this ...
Stellar Explosions
... Nickel-56 is unstable and quickly decays to cobalt-56 which subsequently decays into iron-56 Iron-56 is the most stable nucleus, so it neither fuses nor decays Within the cores of the most massive stars, neutron capture can create heavier elements, all the way up to bismuth-209 The heaviest elements ...
... Nickel-56 is unstable and quickly decays to cobalt-56 which subsequently decays into iron-56 Iron-56 is the most stable nucleus, so it neither fuses nor decays Within the cores of the most massive stars, neutron capture can create heavier elements, all the way up to bismuth-209 The heaviest elements ...
The Hα Balmer line as an effective temperature criterion
... the continuum level. We initially expected a higher rms than that, because of the difficulty in placing the continuum with spectra taken with cross-dispersed spectrographs. For the northern stars, the rms of the best fit was obtained in dividing the variance by the number of points minus the number of ...
... the continuum level. We initially expected a higher rms than that, because of the difficulty in placing the continuum with spectra taken with cross-dispersed spectrographs. For the northern stars, the rms of the best fit was obtained in dividing the variance by the number of points minus the number of ...
banff04
... higher accretion rates and mass outflow rates (e.g. Pudritz 1985). • Disk photo-evaporation could create a low-velocity disk outflow (e.g. Hollenbach et al. 1994; Yorke & Welz 1996). • Radiation pressure higher for dusty gas (e.g. Wolfire & Cassinelli 1987), may contribute to flow acceleration and a ...
... higher accretion rates and mass outflow rates (e.g. Pudritz 1985). • Disk photo-evaporation could create a low-velocity disk outflow (e.g. Hollenbach et al. 1994; Yorke & Welz 1996). • Radiation pressure higher for dusty gas (e.g. Wolfire & Cassinelli 1987), may contribute to flow acceleration and a ...
Draft Science Cases for KPAO
... The visible applications may be the strongest selling point for KPAO, because there is a “hard” limit at 120nm rms, which produces diffraction limited images in the red part of the visible spectrum. The cone effect on an 8 meter telescope with a single laser guide star produces 125nm of error. So a ...
... The visible applications may be the strongest selling point for KPAO, because there is a “hard” limit at 120nm rms, which produces diffraction limited images in the red part of the visible spectrum. The cone effect on an 8 meter telescope with a single laser guide star produces 125nm of error. So a ...
doc - StealthSkater
... logarithmic potential of form Klog(ρ/ρ0) in the approximation that the individual stars of the dwarf galaxy move completely independently. The second extreme would be a hydrodynamic flow. Sagittarius rotates around the axis orthogonal to the plane of the galaxy with the same velocity as the galactic ...
... logarithmic potential of form Klog(ρ/ρ0) in the approximation that the individual stars of the dwarf galaxy move completely independently. The second extreme would be a hydrodynamic flow. Sagittarius rotates around the axis orthogonal to the plane of the galaxy with the same velocity as the galactic ...
Neutron Stars - Lick Observatory
... agreement with modern EoS. Gamma ray bursters (GRB) have recently been associated with afterglows from which very high REDSHIFTS (z ( 1) could be determined. An enormous energy output of E~1053 ergs can be inferred, if isotropically emitted, but there is evidence for beaming or jets and the GRB ther ...
... agreement with modern EoS. Gamma ray bursters (GRB) have recently been associated with afterglows from which very high REDSHIFTS (z ( 1) could be determined. An enormous energy output of E~1053 ergs can be inferred, if isotropically emitted, but there is evidence for beaming or jets and the GRB ther ...
Photometry Review from Some Constellations of Autumn in the
... Photometry is the measurement of the intensity of light or of relative illuminating power. Photometric measurements are made with instruments called photometers. The devices function by collecting light through some kind of input optics, passing it through a spectral modifying filter and then measur ...
... Photometry is the measurement of the intensity of light or of relative illuminating power. Photometric measurements are made with instruments called photometers. The devices function by collecting light through some kind of input optics, passing it through a spectral modifying filter and then measur ...
Stellar Evolution
... … another one, observed Energy equivalent to the entire mass by us with the MDM 1.3 m of the sun (E = mc2), converted into gamma-rays in just a few seconds! telescope on Kitt Peak! ...
... … another one, observed Energy equivalent to the entire mass by us with the MDM 1.3 m of the sun (E = mc2), converted into gamma-rays in just a few seconds! telescope on Kitt Peak! ...
THE 3-D UNIVERSE CONCEPTS
... Our eyes alone cannot judge the distances to objects in space It is impossible to determine the distance to a star using your eyes alone. You are able to judge the distance to nearby objects because each eye views them from a different angle. Your brain combines these two perspectives to give you a ...
... Our eyes alone cannot judge the distances to objects in space It is impossible to determine the distance to a star using your eyes alone. You are able to judge the distance to nearby objects because each eye views them from a different angle. Your brain combines these two perspectives to give you a ...
Astronomy
... rise in the east, cross overhead, and set in the west, much like the Sun. (Use page 4 Edmond Star Guide to explain) Demonstrate the change in position of the Big Dipper in the sky (using a skymap) Explain the assignment that each Scout will need to draw the sketches on a clear night this week an ...
... rise in the east, cross overhead, and set in the west, much like the Sun. (Use page 4 Edmond Star Guide to explain) Demonstrate the change in position of the Big Dipper in the sky (using a skymap) Explain the assignment that each Scout will need to draw the sketches on a clear night this week an ...
Slide 1
... Calculate the ages of the coolest white dwarf stars: White dwarf cosmochronology • Critical theoretical uncertainties for dating the coolest WDs – Outer layers • Convection, degeneracy, and radiative opacity ...
... Calculate the ages of the coolest white dwarf stars: White dwarf cosmochronology • Critical theoretical uncertainties for dating the coolest WDs – Outer layers • Convection, degeneracy, and radiative opacity ...
Multi-Object Spectroscopy: Science Applications
... Dynamical measurement of Wm 1. Assume average galaxy M/L is the same in clusters and in the field 2. Use the field sample from same survey to measure (M/L)crit = rcrit/j, where j is the luminosity density of the Universe 3. This calculation yields Wm~0.3; the most convincing evidence for low Wm at ...
... Dynamical measurement of Wm 1. Assume average galaxy M/L is the same in clusters and in the field 2. Use the field sample from same survey to measure (M/L)crit = rcrit/j, where j is the luminosity density of the Universe 3. This calculation yields Wm~0.3; the most convincing evidence for low Wm at ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.