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... Figure 1). The abundances of non-neutron-capture elements in all nine stars are consistent with abundances in other UFD stars and Galactic halo stars11,15,24. Surprisingly, only the two most metal-poor stars show the deficiency of neutron-capture elements typically found in UFDs11,16, whereas the re ...
... Figure 1). The abundances of non-neutron-capture elements in all nine stars are consistent with abundances in other UFD stars and Galactic halo stars11,15,24. Surprisingly, only the two most metal-poor stars show the deficiency of neutron-capture elements typically found in UFDs11,16, whereas the re ...
... chondrules formed directly from the cloud of gas and dust that surrounded the Sun as it was still forming. The intellectual battle was between direct condensation from the solar nebula, as the dusty cloud is called, or secondary processes such as impact or volcanism. The secondary processes fell by ...
Accuracy of spectroscopy-based radioactive dating of stars
... available, so that they cannot be placed with confidence on theoretical isochrones in the Hertzsprung-Russell diagram (HRD). For cluster stellar populations, on the other hand, HRD fitting usually provides rather precise absolute ages (e.g. Vandenberg et al. 1996). However, for stellar clusters (esp ...
... available, so that they cannot be placed with confidence on theoretical isochrones in the Hertzsprung-Russell diagram (HRD). For cluster stellar populations, on the other hand, HRD fitting usually provides rather precise absolute ages (e.g. Vandenberg et al. 1996). However, for stellar clusters (esp ...
Flare Observations
... A few years after Carrington and Hodgson, the Sun was studied extensively in the Hα line originating in the chromosphere, and the reports of flares became much more frequent, but also bewilderingly complex. Variations of source size, ejections of plasma blobs into interplanetary space, and blast wav ...
... A few years after Carrington and Hodgson, the Sun was studied extensively in the Hα line originating in the chromosphere, and the reports of flares became much more frequent, but also bewilderingly complex. Variations of source size, ejections of plasma blobs into interplanetary space, and blast wav ...
The Evolution of Isotope Ratios in the Milky Way Galaxy
... Isotope ratios have opened a new window into the study of the details of stellar evolution, supernovae, and galactic chemical evolution. We present the evolution of the isotope ratios of elemental abundances (from C to Zn) in the solar neighbourhood, bulge, halo, and thick disk, using chemical evolu ...
... Isotope ratios have opened a new window into the study of the details of stellar evolution, supernovae, and galactic chemical evolution. We present the evolution of the isotope ratios of elemental abundances (from C to Zn) in the solar neighbourhood, bulge, halo, and thick disk, using chemical evolu ...
CHAPTER 8 Survey of Solar Systems
... When several planets appear near each other in the evening sky, we can see that they lie along a linear band extending away from the Sun (fig. 8.4). The planets appear to lie along a line because their orbits, as well as the Earth’s, all lie in nearly the same plane, as shown in the side view of the ...
... When several planets appear near each other in the evening sky, we can see that they lie along a linear band extending away from the Sun (fig. 8.4). The planets appear to lie along a line because their orbits, as well as the Earth’s, all lie in nearly the same plane, as shown in the side view of the ...
Lecture Notes and Essays in Astrophysics VOLUME III
... Venus clouds have been analyzed by remote sounding and in situ investigations which were able to characterize the vertical distribution of particles. As summarized on Figure 4 the clouds are accepted to be highly stratified in several extended layers with different types of particles. Most of the vi ...
... Venus clouds have been analyzed by remote sounding and in situ investigations which were able to characterize the vertical distribution of particles. As summarized on Figure 4 the clouds are accepted to be highly stratified in several extended layers with different types of particles. Most of the vi ...
Discovery of extremely lead-rich subdwarfs: does heavy metal signal
... absorption line at 4049.8 Å and weaker lines at 3962.5 and 4496.1 Å. These have been identified from the National Institute of Standards and Technology (NIST) atomic data base to be due to Pb IV (Kramida et al. 2012). HE 1256−2738 also shows the Pb IV lines at 4049.8 and 3962.5 Å; 4496.1 Å is too we ...
... absorption line at 4049.8 Å and weaker lines at 3962.5 and 4496.1 Å. These have been identified from the National Institute of Standards and Technology (NIST) atomic data base to be due to Pb IV (Kramida et al. 2012). HE 1256−2738 also shows the Pb IV lines at 4049.8 and 3962.5 Å; 4496.1 Å is too we ...
Document
... In 1969, however, two concepts that had been previously published by Forward, laser-propelled lightsails9 and the use of electrically-charged spacecraft to turn in the interstellar magngljie field,12 were combined by Norem'3 into a laserpushed interstellar flight system that could stop at the target ...
... In 1969, however, two concepts that had been previously published by Forward, laser-propelled lightsails9 and the use of electrically-charged spacecraft to turn in the interstellar magngljie field,12 were combined by Norem'3 into a laserpushed interstellar flight system that could stop at the target ...
Radiation Environment of the Chandra X-ray Observatory yr
... Spectroscopy (5) array. Two of the S CCDs are back-illuminated devices; all other CCDs are front-illuminated. ...
... Spectroscopy (5) array. Two of the S CCDs are back-illuminated devices; all other CCDs are front-illuminated. ...
Surface reflectance properties of distant Solar system bodies
... of possible faint objects found on long-exposure frames taken with the Hubble Space Telescope (HST), Cochran et al. (1995) found that many of the possible objects identified were not just noise, but were likely to be Halley-sized (i.e. ~ 10 kIn) KBOs (although no one object could be confirmed as bei ...
... of possible faint objects found on long-exposure frames taken with the Hubble Space Telescope (HST), Cochran et al. (1995) found that many of the possible objects identified were not just noise, but were likely to be Halley-sized (i.e. ~ 10 kIn) KBOs (although no one object could be confirmed as bei ...
Thesis.dot
... Insert your information in place of the sample text, and then click Save As on the File menu. In the Save as type list, click Document Template. To Create a Document from the Template To open the thesis template as a document, on the File menu, click New. The customizations you made will appear in t ...
... Insert your information in place of the sample text, and then click Save As on the File menu. In the Save as type list, click Document Template. To Create a Document from the Template To open the thesis template as a document, on the File menu, click New. The customizations you made will appear in t ...
PDF only - at www.arxiv.org.
... models of radiation-driven accretion disk winds (17). An independent corroboration of the above estimate comes from the variability timescale of ~1 week of the Fe-K absorption feature, probed during the monitoring of PDS 456 by the Suzaku X-ray satellite in early 2013 (18). Indeed, the historical be ...
... models of radiation-driven accretion disk winds (17). An independent corroboration of the above estimate comes from the variability timescale of ~1 week of the Fe-K absorption feature, probed during the monitoring of PDS 456 by the Suzaku X-ray satellite in early 2013 (18). Indeed, the historical be ...
Entire Guide
... Sun-Earth connection. Solar flares are caused by sudden changes of strong magnetic fields in the Sun’s corona. The changing magnetic field converts magnetic potential energy into kinetic energy by accelerating charged gases (plasmas) in the corona. The plasma is channeled by the magnetic field up an ...
... Sun-Earth connection. Solar flares are caused by sudden changes of strong magnetic fields in the Sun’s corona. The changing magnetic field converts magnetic potential energy into kinetic energy by accelerating charged gases (plasmas) in the corona. The plasma is channeled by the magnetic field up an ...
EUV and X-ray Spectroscopy of the Active Sun
... purely by non-thermal beam heating as previously believed, but also required direct heating of the plasma. An observational investigation in to the initiation mechanism of a coronal mass ejection and eruptive flare was then carried out, again utilising observations from a wide range of spacecraft: M ...
... purely by non-thermal beam heating as previously believed, but also required direct heating of the plasma. An observational investigation in to the initiation mechanism of a coronal mass ejection and eruptive flare was then carried out, again utilising observations from a wide range of spacecraft: M ...
transparencies - Indico
... If Pentaquark baryons exist it is the most important finding in hadronic physics since the J/Y discovery. It is absolutely necessary to obtain fully convincing experimental data. Many experiments see positive Q+ signal with specific kinematical cuts, taken together they represent an impressive s ...
... If Pentaquark baryons exist it is the most important finding in hadronic physics since the J/Y discovery. It is absolutely necessary to obtain fully convincing experimental data. Many experiments see positive Q+ signal with specific kinematical cuts, taken together they represent an impressive s ...
Advanced Composition Explorer
Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997 and entered a Lissajous orbit close to the L1 Lagrangian point (which lies between the Sun and the Earth at a distance of some 1.5 million km from the latter) on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters at right are only approximate. The spacecraft is still in generally good condition in 2015, and is projected to have enough fuel to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.