Borexino …..bla bla bla
... The reactions that take place in the core of the Sun are nuclear fusion reactions. On our neighborhood star, hydrogen is being fused into helium in the proton-proton chain reaction in which four protons are fused and two of them undergoes a beta decay to become a neutron, releasing positrons and neu ...
... The reactions that take place in the core of the Sun are nuclear fusion reactions. On our neighborhood star, hydrogen is being fused into helium in the proton-proton chain reaction in which four protons are fused and two of them undergoes a beta decay to become a neutron, releasing positrons and neu ...
Constraints on the Production of Ultra–High
... of inertia I D 1045 ergs s2, a star such as PSR 1937]21 has a rotational energy E \ 1 Iu2 D 1052 ergs, many orders of magnitude greater than2 the D1046.5 ergs required per neutron star. Thus, even if most neutron stars rotate more slowly and the efficiency of cosmic-ray generation is much less than ...
... of inertia I D 1045 ergs s2, a star such as PSR 1937]21 has a rotational energy E \ 1 Iu2 D 1052 ergs, many orders of magnitude greater than2 the D1046.5 ergs required per neutron star. Thus, even if most neutron stars rotate more slowly and the efficiency of cosmic-ray generation is much less than ...
How will the universe end?
... “Time Without End” 1979, “a universe growing without limit in richness and complexity, a universe of life surviving forever...” - humanity should hibernate ...
... “Time Without End” 1979, “a universe growing without limit in richness and complexity, a universe of life surviving forever...” - humanity should hibernate ...
Heic0116: EMBARGOED UNTIL: 20:00 (CET) WEDNESDAY 05
... The Riddle of Dark Matter The nature of Dark Matter is one of the fundamental puzzles in astrophysics today. Observations of clusters of galaxies and the large scale structure of individual galaxies tell us that no more than a quarter of the total amount of matter in the Universe consists of normal ...
... The Riddle of Dark Matter The nature of Dark Matter is one of the fundamental puzzles in astrophysics today. Observations of clusters of galaxies and the large scale structure of individual galaxies tell us that no more than a quarter of the total amount of matter in the Universe consists of normal ...
TOOLS IN ASTRONOMY SPECTROSCOPY
... Included in this activity is a table of simulated stellar spectra (page 169). Your first task is to sort the spectra by creating a classification scheme. As with real stellar spectra, you will never find two exactly the same. The thickness of each line represents how much light is received at a part ...
... Included in this activity is a table of simulated stellar spectra (page 169). Your first task is to sort the spectra by creating a classification scheme. As with real stellar spectra, you will never find two exactly the same. The thickness of each line represents how much light is received at a part ...
More than You Ever Wanted to Know about Autoguiding
... Question Three is “How good does the guiding need to be for round star images”? I have determined over the years that blur adds in an RMS sense, which not everyone realizes. What this means is that if you have 5 pixels of blur due to seeing, and the star moves three pixels during the exposure (or be ...
... Question Three is “How good does the guiding need to be for round star images”? I have determined over the years that blur adds in an RMS sense, which not everyone realizes. What this means is that if you have 5 pixels of blur due to seeing, and the star moves three pixels during the exposure (or be ...
The Sun The Sun is a very typical main sequence star. It contains 1000
... diffusion. Here, the high energy photons generated by nuclear reac9ons are sca_ered, absorbed and re-‐emi_ed by the atoms and free electrons, which causes them to degrade in energy. The fact that heat i ...
... diffusion. Here, the high energy photons generated by nuclear reac9ons are sca_ered, absorbed and re-‐emi_ed by the atoms and free electrons, which causes them to degrade in energy. The fact that heat i ...
document
... • Late life stages of high-mass stars are similar to those of low-mass stars: —Hydrogen core fusion (main sequence) ...
... • Late life stages of high-mass stars are similar to those of low-mass stars: —Hydrogen core fusion (main sequence) ...
Some observed properties of Dark Matter: a progress report on an
... • How common are systems like ours? • How do planetary systems form? • To date many planets have been detected indirectly • Direct detection: – Mass, radius, temperature, composition – ELT will provide large samples of mature giant planets in reflected light – Earth-like planets may be within reach ...
... • How common are systems like ours? • How do planetary systems form? • To date many planets have been detected indirectly • Direct detection: – Mass, radius, temperature, composition – ELT will provide large samples of mature giant planets in reflected light – Earth-like planets may be within reach ...
3-D Visualization of Cataclysmic Variables With IDL by:
... The focus of this summer's research was the modeling of magnetic cataclysmic variables using Interactive Data Language(IDL) software. A basic IDL program designed for this specific purpose was already in existence; created by Dr. Cash and previous research students under her supervision. The ultima ...
... The focus of this summer's research was the modeling of magnetic cataclysmic variables using Interactive Data Language(IDL) software. A basic IDL program designed for this specific purpose was already in existence; created by Dr. Cash and previous research students under her supervision. The ultima ...
L12-no equations
... Discovery of neutron stars 1967: Hewish and Bell discovered regularly spaced radio pulses P=1.337s, repeating from same point in sky. Approx. 1500 pulsars now known, with periods on range 0.002 < P < 4.3 s Crab pulsar - embedded in Crab nebula, which is remnant of supernova historically recorded in ...
... Discovery of neutron stars 1967: Hewish and Bell discovered regularly spaced radio pulses P=1.337s, repeating from same point in sky. Approx. 1500 pulsars now known, with periods on range 0.002 < P < 4.3 s Crab pulsar - embedded in Crab nebula, which is remnant of supernova historically recorded in ...
Astronomy 112: The Physics of Stars Class 11 Notes: Stellar
... contrast, instability occurs when any small deviation from an equilibrium solution tends to drive the system further and further away from it. The classic example of an unstable system is a pencil standing on its point. If one could get the pencil to balance completely perfectly, it would be in equi ...
... contrast, instability occurs when any small deviation from an equilibrium solution tends to drive the system further and further away from it. The classic example of an unstable system is a pencil standing on its point. If one could get the pencil to balance completely perfectly, it would be in equi ...
Today The Sun Events
... It can be powered by NUCLEAR ENERGY! (E = mc2) Nuclear potential energy (core) ...
... It can be powered by NUCLEAR ENERGY! (E = mc2) Nuclear potential energy (core) ...
AAS_winter14rev1final - BU Blogs
... particle belt objects in 5.1. Some Implications of the Disk Model s through the inner region where dustdistribution interactsbetween with the (e.g., Barucci al. 2008), cross section (and thus optical depth) to massetsurface densitywe may expect many additional own inner planet. Two possible orbits v ...
... particle belt objects in 5.1. Some Implications of the Disk Model s through the inner region where dustdistribution interactsbetween with the (e.g., Barucci al. 2008), cross section (and thus optical depth) to massetsurface densitywe may expect many additional own inner planet. Two possible orbits v ...
doc - StealthSkater
... the dark matter distribution. Maybe the "parts" refer to the 4 globular clusters of stars belonging to Sagittarius. In any case, a highly-refined study of the structure of the star stream left behind by Sagittarius is carried out and one goal has been to find a gravitational potential allowing to fi ...
... the dark matter distribution. Maybe the "parts" refer to the 4 globular clusters of stars belonging to Sagittarius. In any case, a highly-refined study of the structure of the star stream left behind by Sagittarius is carried out and one goal has been to find a gravitational potential allowing to fi ...
Unit 8 Chapter 30 Stars, Galaxies and the Universe
... metals (U, Pb, Fe, Ni). When all of the fuel is used up the collapse of these metals is very rapid. The star can not contain all the material, it just EXPLODES. The death takes millions of years, but when it gets to the core, it can take a few weeks to a few months. This becomes the source material ...
... metals (U, Pb, Fe, Ni). When all of the fuel is used up the collapse of these metals is very rapid. The star can not contain all the material, it just EXPLODES. The death takes millions of years, but when it gets to the core, it can take a few weeks to a few months. This becomes the source material ...
Pulsars as Astrophysical Laboratories for Nuclear and Particle Physics
... potential energy of the matter accreted from a low-mass companion is the energy source, and (3) magnetars (e.g, SGR 1806-20), where the decay of a ultra-strong magnetic field powers the radiation. The fastest, very recently discovered neutron star, PSR J1748-2446ad, rotates at a period of 1.39 ms (w ...
... potential energy of the matter accreted from a low-mass companion is the energy source, and (3) magnetars (e.g, SGR 1806-20), where the decay of a ultra-strong magnetic field powers the radiation. The fastest, very recently discovered neutron star, PSR J1748-2446ad, rotates at a period of 1.39 ms (w ...
P-nuclei
p-Nuclei (p stands for proton-rich) are certain proton-rich, naturally occurring isotopes of some elements between selenium and mercury which cannot be produced in either s- or r-process.