25 Years of the Hubble Space Telescope - Speaker
... The immense nebula contains at least a dozen brilliant stars that are roughly estimated to be at least 50 to 100 times the mass of our Sun. The most unique and opulent inhabitant is the star Eta Carinae, at far left. Eta Carinae is in the final stages of its brief and eruptive lifespan, as evidenced ...
... The immense nebula contains at least a dozen brilliant stars that are roughly estimated to be at least 50 to 100 times the mass of our Sun. The most unique and opulent inhabitant is the star Eta Carinae, at far left. Eta Carinae is in the final stages of its brief and eruptive lifespan, as evidenced ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... Supernovae of Type Ia (SNe Ia) are the thermonuclear explosions of carbon-oxygen white dwarf (CO WD) stars, commonly used as cosmological standard candles although their progenitor scenario is not yet well understood (e.g., Howell 2011). Most likely, the WD is in a binary system with either another ...
... Supernovae of Type Ia (SNe Ia) are the thermonuclear explosions of carbon-oxygen white dwarf (CO WD) stars, commonly used as cosmological standard candles although their progenitor scenario is not yet well understood (e.g., Howell 2011). Most likely, the WD is in a binary system with either another ...
Neutron Stars
... were first proposed by Landau who suggested that in analogy to the support of white dwarfs by electron degeneracy pressure, neutron stars could be supported by neutron degeneracy pressure. Baade and Zwicky1 in 1934 firstsuggested neutron stars as being the remnants of supernovae. Tolman2 in 1939 produ ...
... were first proposed by Landau who suggested that in analogy to the support of white dwarfs by electron degeneracy pressure, neutron stars could be supported by neutron degeneracy pressure. Baade and Zwicky1 in 1934 firstsuggested neutron stars as being the remnants of supernovae. Tolman2 in 1939 produ ...
The environment of high-redshift AGN OLIMPIA JUDIT FOGASY
... galaxies (late type), which are blue and star-forming, and elliptical galaxies (early type), which are red and passive in terms of star formation. The different colour of spiral and elliptical galaxies indicate different stellar populations: spiral galaxies have very mixed stellar populations, conta ...
... galaxies (late type), which are blue and star-forming, and elliptical galaxies (early type), which are red and passive in terms of star formation. The different colour of spiral and elliptical galaxies indicate different stellar populations: spiral galaxies have very mixed stellar populations, conta ...
Gamma Ray Bursts (GRB)
... Collapsar Model – The core of a massive star rapidly collapses into a black hole. In doing so, a shock wave is created in the same way as in a supernova, but the amount of gravitational energy is very large near the event horizon. An especially violent supernova occurs, shedding high energy photons ...
... Collapsar Model – The core of a massive star rapidly collapses into a black hole. In doing so, a shock wave is created in the same way as in a supernova, but the amount of gravitational energy is very large near the event horizon. An especially violent supernova occurs, shedding high energy photons ...
Effects of triple-α and C(α, γ )16 O reaction rates on the supernova
... Apart from appearances of observations, we can see the effects of the OKK rate on stellar evolution from the ignition properties. A helium core flash is triggered if the nuclear energy generation rates (εn ) become significantly larger than the neutrino energy loss rates (εν ). We can understand cle ...
... Apart from appearances of observations, we can see the effects of the OKK rate on stellar evolution from the ignition properties. A helium core flash is triggered if the nuclear energy generation rates (εn ) become significantly larger than the neutrino energy loss rates (εν ). We can understand cle ...
Radiative winds, accretion disks and massive stars physics using
... • The resonance line of NIV is at 765A, so an ion that absorbs such a photon will increase its velocity by hν/mc=37 cm/s. To accelerate a single N3+ ion to 2000km/s requires 5x106 absorptions. In fact, since the wind is a plasma, the momentum gained by the N3+ ion is shared with all constituents in ...
... • The resonance line of NIV is at 765A, so an ion that absorbs such a photon will increase its velocity by hν/mc=37 cm/s. To accelerate a single N3+ ion to 2000km/s requires 5x106 absorptions. In fact, since the wind is a plasma, the momentum gained by the N3+ ion is shared with all constituents in ...
The presence of gamma rays in space was known before they were
... gamma rays due to Rutherford. It was not until 1948 when Freeberg and Primakoff theorised that gamma rays are produced in space. The first actual gamma rays detected from space were detected by sensors mounted on a high altitude balloon by the scientists Peterson and Winckler in 1958. This was in th ...
... gamma rays due to Rutherford. It was not until 1948 when Freeberg and Primakoff theorised that gamma rays are produced in space. The first actual gamma rays detected from space were detected by sensors mounted on a high altitude balloon by the scientists Peterson and Winckler in 1958. This was in th ...
Accuracy of spectroscopy-based radioactive dating of stars
... Hf abundances are derived from singly ionized species which constitute the dominant ionization stage in the late-type stars of interest here. Moreover, the diagnostic lines of Th and Hf emerge from low lying energy levels which makes the Boltzmann factor and consequently the temperature sensitivity ...
... Hf abundances are derived from singly ionized species which constitute the dominant ionization stage in the late-type stars of interest here. Moreover, the diagnostic lines of Th and Hf emerge from low lying energy levels which makes the Boltzmann factor and consequently the temperature sensitivity ...
Telluric Line Removal in Astrophysical Spectroscopy
... not affected by the motion of the Earth around the Sun. The object’s lines will shift according to the Doppler Effect, being blue shifted slightly when the Earth moves toward the object, and red shifted when the Earth moves away. Since the telluric lines do not shift wavelengths, this motion around ...
... not affected by the motion of the Earth around the Sun. The object’s lines will shift according to the Doppler Effect, being blue shifted slightly when the Earth moves toward the object, and red shifted when the Earth moves away. Since the telluric lines do not shift wavelengths, this motion around ...
Astronomy 112 - Solar Physics and Space Weather
... anything impacting the surface causing a crater to form) will carve out a crater about 20 times its own diameter. After a crater has been formed, there are several factors, such as erosion by water and wind, that gradually obliterate a crater. On Mars, it is estimated that wind-carried dust can obli ...
... anything impacting the surface causing a crater to form) will carve out a crater about 20 times its own diameter. After a crater has been formed, there are several factors, such as erosion by water and wind, that gradually obliterate a crater. On Mars, it is estimated that wind-carried dust can obli ...
(a) Mean solar time
... position on the celestial sphere, but with the effect of nutation on the coordinates also removed. This is done by referring the equatorial coordinates (α,δ) to the mean equator and equinox for the time of observation, instead of the true equator and equinox. The mean position still has the effects ...
... position on the celestial sphere, but with the effect of nutation on the coordinates also removed. This is done by referring the equatorial coordinates (α,δ) to the mean equator and equinox for the time of observation, instead of the true equator and equinox. The mean position still has the effects ...
1 Discovery of peculiar periodic spectral
... KEY WORDS: Stars: solar type - Techniques: spectroscopic - Extraterrestrial intelligence ...
... KEY WORDS: Stars: solar type - Techniques: spectroscopic - Extraterrestrial intelligence ...
Superbubble Activity in Star-Forming Galaxies M. S. Oey
... emission has been detected within many objects, which is qualitatively consistent with the adiabatic evolution model. Two classes of X-ray emission have been identified: objects with X-ray luminosity Lx in excess of the model’s prediction (Chu & Mac Low 1990; Wang & Helfand 1991), and objects that r ...
... emission has been detected within many objects, which is qualitatively consistent with the adiabatic evolution model. Two classes of X-ray emission have been identified: objects with X-ray luminosity Lx in excess of the model’s prediction (Chu & Mac Low 1990; Wang & Helfand 1991), and objects that r ...
Astronomical Circumstances
... may have much different fates. For example, small stars Once its hydrogen fuel is mostly consumed, a medium do not go through the giant stage but simply collapse sized star like our own will expand outward to become a into white dwarves after the main sequence. The death red giant. During this stag ...
... may have much different fates. For example, small stars Once its hydrogen fuel is mostly consumed, a medium do not go through the giant stage but simply collapse sized star like our own will expand outward to become a into white dwarves after the main sequence. The death red giant. During this stag ...
Astrometry of Asteroids
... The techniques you will be using for this lab involve the measurement of precise star positions, a technique called astrometry, which is one of the fundamental tools of astronomers. Astrometry, of course, enables us to make charts of objects in the sky, assigning two numbers or celestial coordinates ...
... The techniques you will be using for this lab involve the measurement of precise star positions, a technique called astrometry, which is one of the fundamental tools of astronomers. Astrometry, of course, enables us to make charts of objects in the sky, assigning two numbers or celestial coordinates ...
Super-Eddington outburst in a binary system: V4641 Sgr Mikhail Revnivtsev, Marat Gilfanov
... • We argue that V4641 Sgr in Sep. 1999 demonstrated an episode of super-Eddington accretion • During this episode a powerful expended evelope was formed • When the accretion rate decreased the envelope vanished • X-ray observations support this picture: we have detected the change in the X-ray absor ...
... • We argue that V4641 Sgr in Sep. 1999 demonstrated an episode of super-Eddington accretion • During this episode a powerful expended evelope was formed • When the accretion rate decreased the envelope vanished • X-ray observations support this picture: we have detected the change in the X-ray absor ...
Exploring Neutral Hydrogen and Galaxy Evolution with the SKA
... Analysis of thousands of galaxies in the Sloan Digital Sky Survey (SDSS) has shown that they follow a bimodal distribution in colour as a function of stellar mass (Baldry et al. (2004)); most galaxies are either located in the so-called blue cloud or on the red sequence, indicating that star formati ...
... Analysis of thousands of galaxies in the Sloan Digital Sky Survey (SDSS) has shown that they follow a bimodal distribution in colour as a function of stellar mass (Baldry et al. (2004)); most galaxies are either located in the so-called blue cloud or on the red sequence, indicating that star formati ...
Homologous Stars: Simple Scaling Relations
... The case n = 0 corresponds to incompressible fluid, i.e. ρ = ρc = const, P = Pc θ, and it requires rewriting eq. (poly.6) in a different form. In this case pressure vanishes at the surface, but density is the same throughout the ”star”. This solution is a crude approximation to the interior structur ...
... The case n = 0 corresponds to incompressible fluid, i.e. ρ = ρc = const, P = Pc θ, and it requires rewriting eq. (poly.6) in a different form. In this case pressure vanishes at the surface, but density is the same throughout the ”star”. This solution is a crude approximation to the interior structur ...
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... experiments, but then thought of something new: The Kepler spacecraft in its search for extra-‐solar planets might be far better than any of the ground-‐based microlensing searches We were surprised ...
... experiments, but then thought of something new: The Kepler spacecraft in its search for extra-‐solar planets might be far better than any of the ground-‐based microlensing searches We were surprised ...
CORONAL EVOLUTION OF THE SUN IN TIME: HIGH
... bright chromospheric plages, chromospheric emission lines, and coronal radio and X-ray emissions. The coronal emissions display the largest range of variation in response to the surface magnetic activity level. Whereas starspots may cover a few percent of the photosphere of the most active solar ana ...
... bright chromospheric plages, chromospheric emission lines, and coronal radio and X-ray emissions. The coronal emissions display the largest range of variation in response to the surface magnetic activity level. Whereas starspots may cover a few percent of the photosphere of the most active solar ana ...
Grade 9 Space Review 50KB Nov 18 2009 10:52:00 AM
... 31. The Sun emits not only visible light but also other forms of radiation. List some of these other forms and their effect on living things on Earth. Write your answer in complete sentences. 32. What advice would you give to dedicated sunbathers? Why? Publish your advice in the school newspaper. 33 ...
... 31. The Sun emits not only visible light but also other forms of radiation. List some of these other forms and their effect on living things on Earth. Write your answer in complete sentences. 32. What advice would you give to dedicated sunbathers? Why? Publish your advice in the school newspaper. 33 ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.