Acceleration of Coronal Mass Ejection In Long Rising Solar
... • Fusion is much faster than PP-chain • C, N, O act as catalysts ...
... • Fusion is much faster than PP-chain • C, N, O act as catalysts ...
Exploration of the Kuiper Belt by High-Precision Photometric
... KBOs down to objects of 1 km radius leads to 1011 KBOs with a total mass of only 0.1 Mo (Gladman et al. 2001). In contrast, a simple extrapolation of the surface mass density of the solar system outside 35 AU yields several Earth masses. Moreover, KBO accretion models require an initial Kuiper Belt ...
... KBOs down to objects of 1 km radius leads to 1011 KBOs with a total mass of only 0.1 Mo (Gladman et al. 2001). In contrast, a simple extrapolation of the surface mass density of the solar system outside 35 AU yields several Earth masses. Moreover, KBO accretion models require an initial Kuiper Belt ...
PHYS3380_102815_bw - The University of Texas at Dallas
... nearly 96 billion kilometers from this young star system. - appears much broader than the narrow jets seen in other young stars, but it is caused by the same process - the ejection of gas from a star. ...
... nearly 96 billion kilometers from this young star system. - appears much broader than the narrow jets seen in other young stars, but it is caused by the same process - the ejection of gas from a star. ...
Binary evolution in a nutshell
... Here we made the assumption that the fraction of the stellar mass available for hydrogen fusion is the same for all stars. In reality, this factor will vary; it is ∼ 0.15 for the Sun, but may be much larger for more massive stars, for example because they have convective cores and can mix material f ...
... Here we made the assumption that the fraction of the stellar mass available for hydrogen fusion is the same for all stars. In reality, this factor will vary; it is ∼ 0.15 for the Sun, but may be much larger for more massive stars, for example because they have convective cores and can mix material f ...
–1– 2. Milky Way We know a great deal, perhaps more than any
... • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is about 10 kpc, and the MW is flattened with an axial ratio of 1/5. The Sun is abo ...
... • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is about 10 kpc, and the MW is flattened with an axial ratio of 1/5. The Sun is abo ...
Galaxies
... clusters of galaxies? – Masses measured from galaxy motions, temperature of hot gas, and gravitational lensing all indicate that the vast majority of matter in clusters is dark ...
... clusters of galaxies? – Masses measured from galaxy motions, temperature of hot gas, and gravitational lensing all indicate that the vast majority of matter in clusters is dark ...
Chapter 12 Star Stuff How do stars form?
... core, depositing a shell of helium on the core The shell of helium begins fusing to carbon while the hydrogen shell above it fuses to helium The star has become a red giant called a “double-shell burning star” This double-shell-burning stage is unsteady, and the fusion rate periodically spikes upwar ...
... core, depositing a shell of helium on the core The shell of helium begins fusing to carbon while the hydrogen shell above it fuses to helium The star has become a red giant called a “double-shell burning star” This double-shell-burning stage is unsteady, and the fusion rate periodically spikes upwar ...
The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL)
... regions The Spitzer–GLIMPSE images at 8 µm have unveiled a “bubbling Galactic disc”. More than 600 bubbles with diameters of a few arcminutes have been catalogued by Churchwell et al. (2006, 2007). As shown by Deharveng et al. (2010), more than 85 % of these 8 µm bubbles enclose H ii regions and con ...
... regions The Spitzer–GLIMPSE images at 8 µm have unveiled a “bubbling Galactic disc”. More than 600 bubbles with diameters of a few arcminutes have been catalogued by Churchwell et al. (2006, 2007). As shown by Deharveng et al. (2010), more than 85 % of these 8 µm bubbles enclose H ii regions and con ...
Finding habitable earths around white dwarfs with a robotic
... There are significant deviations from the Mestel cooling law due to a range of physical effects, most importantly for cool white dwarfs are crystallization and gravitational separation. So instead of equation 1, I used the cooling models computed by Bergeron et al.9 to compute the white dwarf lumino ...
... There are significant deviations from the Mestel cooling law due to a range of physical effects, most importantly for cool white dwarfs are crystallization and gravitational separation. So instead of equation 1, I used the cooling models computed by Bergeron et al.9 to compute the white dwarf lumino ...
File
... * For example, to escape from Earth, a spaceship would have to leave Earth’s surface at 11 km/s (25,000 mph). ...
... * For example, to escape from Earth, a spaceship would have to leave Earth’s surface at 11 km/s (25,000 mph). ...
Detecting the glint of starlight on the oceans of distant planets
... by water, only a tiny percentage of the ocean surface contributes to the specular term because the probability of waves being oriented properly for sending light in the direction of Earth is small; when the planet is in quadrature phase as in Fig. 3a, the disk-averaged value of pwav is found from th ...
... by water, only a tiny percentage of the ocean surface contributes to the specular term because the probability of waves being oriented properly for sending light in the direction of Earth is small; when the planet is in quadrature phase as in Fig. 3a, the disk-averaged value of pwav is found from th ...
Local preprint copy
... 106 years for the F0 star. All of these timescales are very short relative to the lifetime of the star, but 106 years may be long enough that the exomoon’s orbit could be externally perturbed by a planet or planetesimal disk. On the other hand, as Figure 1 shows, the semimajor axis decay typically h ...
... 106 years for the F0 star. All of these timescales are very short relative to the lifetime of the star, but 106 years may be long enough that the exomoon’s orbit could be externally perturbed by a planet or planetesimal disk. On the other hand, as Figure 1 shows, the semimajor axis decay typically h ...
ASTRONOMY 120
... A nova is a binary star system that suddenly brightens and then slowly fades back to normal. It is caused by an evolving star in a binary that is expanding past its Roche lobe and losing gas to a companion white dwarf. After a while, the material (primarily hydrogen) builds up on the white dwarf and ...
... A nova is a binary star system that suddenly brightens and then slowly fades back to normal. It is caused by an evolving star in a binary that is expanding past its Roche lobe and losing gas to a companion white dwarf. After a while, the material (primarily hydrogen) builds up on the white dwarf and ...
Summary of Talks at Growing Black Holes 2004 in Garching
... to estimates of quasar lifetimes. At z < 2.5, SDSS clustering scale is about 7 Mpc. There is now preliminary, tentative evidence for correlation length to increase with redshift. Spectra of emission lines in high z quasars & Continuum shape consistent with lower z objects -> implication : rapid ch ...
... to estimates of quasar lifetimes. At z < 2.5, SDSS clustering scale is about 7 Mpc. There is now preliminary, tentative evidence for correlation length to increase with redshift. Spectra of emission lines in high z quasars & Continuum shape consistent with lower z objects -> implication : rapid ch ...
The Search for Extrasolar Earth-like Planets
... be oriented to show transits is the ratio of the stellar radius to planet semi-major axis. For Earth and the sun this is 0.5%, meaning that 200 stars with Earthlike planets would have to be monitored to detect one transiting system. Furthermore, one would want to see two or three transits to measure ...
... be oriented to show transits is the ratio of the stellar radius to planet semi-major axis. For Earth and the sun this is 0.5%, meaning that 200 stars with Earthlike planets would have to be monitored to detect one transiting system. Furthermore, one would want to see two or three transits to measure ...
Stars and Planets - The University of Texas at Dallas
... The Pleiades is a famous cluster of young stars visible in the constellation Taurus. When most of the gas and dust is gone from a stellar nursery, the young stars are in an open cluster. One day these star systems will drift apart. Image source: http://antwrp.gsfc.nasa.gov/apod/ap021201.html ...
... The Pleiades is a famous cluster of young stars visible in the constellation Taurus. When most of the gas and dust is gone from a stellar nursery, the young stars are in an open cluster. One day these star systems will drift apart. Image source: http://antwrp.gsfc.nasa.gov/apod/ap021201.html ...
