Dyson Spheres around White Dwarfs arXiv:1503.04376
... of the power3 and mass of the central object. We then draw temperaturegravity graphs for a representative sample of white dwarfs, and observe that for about one third of the white dwarfs, acceptable radii for Dyson Spheres can be found. In section 4, we discuss some details such as the material requ ...
... of the power3 and mass of the central object. We then draw temperaturegravity graphs for a representative sample of white dwarfs, and observe that for about one third of the white dwarfs, acceptable radii for Dyson Spheres can be found. In section 4, we discuss some details such as the material requ ...
Program and Abstract Book - European Southern Observatory
... Mike Dunham (SUNY Fredonia, NY, USA) Stars form from the gravitational collapse of dense molecular cloud cores. In the protostellar phase, mass both accretes from the core onto a protostar, likely through an accretion disk, and is ejected in the form of jets and outflows. It is during this protostel ...
... Mike Dunham (SUNY Fredonia, NY, USA) Stars form from the gravitational collapse of dense molecular cloud cores. In the protostellar phase, mass both accretes from the core onto a protostar, likely through an accretion disk, and is ejected in the form of jets and outflows. It is during this protostel ...
A Compilation of Relevant Articles from MMM`s first 25 years, issues
... 4.A. Stars come bigger, brighter, and hotter; and they come smaller, dimmer, and cooler. But there are far, far more stars smaller than the Sun, than larger. About 4% of stars are solar-type, perhaps another 4% bigger and brighter, and 92% smaller. Ours is well above average, and that often heard pu ...
... 4.A. Stars come bigger, brighter, and hotter; and they come smaller, dimmer, and cooler. But there are far, far more stars smaller than the Sun, than larger. About 4% of stars are solar-type, perhaps another 4% bigger and brighter, and 92% smaller. Ours is well above average, and that often heard pu ...
Unravelling the Origin and Evolution of Our Galaxy
... than our Sun. These are all within a distance of about 100 light-years. The planets detectable by this method are rather massive, comparable to Jupiter (which has about 300 times the mass of Earth). The systems have some surprising properties: two thirds of these giant planets are orbiting their hos ...
... than our Sun. These are all within a distance of about 100 light-years. The planets detectable by this method are rather massive, comparable to Jupiter (which has about 300 times the mass of Earth). The systems have some surprising properties: two thirds of these giant planets are orbiting their hos ...
Astronomy, Astrophysics, and Cosmology
... G If star is in equilibrium + acceleration balanced by pressure gradient from center of star to its surface G Since P = F/A + pressure change along distance dr yields ...
... G If star is in equilibrium + acceleration balanced by pressure gradient from center of star to its surface G Since P = F/A + pressure change along distance dr yields ...
Using color photometry to separate transiting exoplanets from false
... and V − I of blends constructed of identical eclipsing components with constant components of slightly different colors for several different projected inclinations. For these blends, the separation between the eclipsing and constant components was adjusted such that there was a fixed transit depth ...
... and V − I of blends constructed of identical eclipsing components with constant components of slightly different colors for several different projected inclinations. For these blends, the separation between the eclipsing and constant components was adjusted such that there was a fixed transit depth ...
PDF Full-text
... during flares. Increasing photodissociation of H2 O leads to increases in the mixing ratios of O and H at these atmospheric levels. This calculation does not include the rest of the observed UV flux from GJ 436 or the flux in the 91.2–120 nm band that is important for the photodissociation of CO and ...
... during flares. Increasing photodissociation of H2 O leads to increases in the mixing ratios of O and H at these atmospheric levels. This calculation does not include the rest of the observed UV flux from GJ 436 or the flux in the 91.2–120 nm band that is important for the photodissociation of CO and ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosit ...
... We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosit ...
The Royal Arch of the Heavens
... We all know that the equator of the earth is tilted at 23½ from its path around the Sun and this tilt is what gives us our seasons. Viewed from Earth, the Sun appears to move along an orbit called the plane of the ecliptic which makes the sun appear to rise and set at different places on the horizo ...
... We all know that the equator of the earth is tilted at 23½ from its path around the Sun and this tilt is what gives us our seasons. Viewed from Earth, the Sun appears to move along an orbit called the plane of the ecliptic which makes the sun appear to rise and set at different places on the horizo ...
Spectroscopy: Unlocking the Secrets of Star Light
... The slit on the spectrograph limits the light entering the spectrograph so that it acts as a point source of light from a larger image. This allows an astronomer to take a number of spectra from different regions of an extended source such as a galaxy or of s specific star in the telescope's field o ...
... The slit on the spectrograph limits the light entering the spectrograph so that it acts as a point source of light from a larger image. This allows an astronomer to take a number of spectra from different regions of an extended source such as a galaxy or of s specific star in the telescope's field o ...
Spectroscopy: Unlocking the Secrets of Star Light
... The slit on the spectrograph limits the light entering the spectrograph so that it acts as a point source of light from a larger image. This allows an astronomer to take a number of spectra from different regions of an extended source such as a galaxy or of s specific star in the telescope's field o ...
... The slit on the spectrograph limits the light entering the spectrograph so that it acts as a point source of light from a larger image. This allows an astronomer to take a number of spectra from different regions of an extended source such as a galaxy or of s specific star in the telescope's field o ...
preprint, pdf version - LESIA
... events observed in Brazil and Chile (4 June 2011) and in Hawaii (23 June 2011). These last two events, as in 22 June 2008, were double events in which Charon and Pluto occulted the same star. In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of ...
... events observed in Brazil and Chile (4 June 2011) and in Hawaii (23 June 2011). These last two events, as in 22 June 2008, were double events in which Charon and Pluto occulted the same star. In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of ...
Document
... there are several another populations (Giant, supergiant , white dwarfs). • Giant stars are stars in the late stage of the evolution. • White dwarfs are end stage of the low mass star. • After main sequence phase, how do star evolve? ...
... there are several another populations (Giant, supergiant , white dwarfs). • Giant stars are stars in the late stage of the evolution. • White dwarfs are end stage of the low mass star. • After main sequence phase, how do star evolve? ...
The Starry Gnosis - Archidoxical Order of Magi
... the sensations and feelings that the symbols created in the imagination are real; acting as if the goal of the operation has already been accomplished. We might say that the Holy Guardian Angel, as the Augoeides is the conductor that moves the symbol from the internal field of the imagination to the ...
... the sensations and feelings that the symbols created in the imagination are real; acting as if the goal of the operation has already been accomplished. We might say that the Holy Guardian Angel, as the Augoeides is the conductor that moves the symbol from the internal field of the imagination to the ...
Course Outline - Tony Bacigalupo
... The region of a galaxy beyond the visible halo where dark matter is believed to reside Composition? ...
... The region of a galaxy beyond the visible halo where dark matter is believed to reside Composition? ...
Folie 1
... How to answer some of these? Monitor the brightness of many YSOs over a long period of time. ...
... How to answer some of these? Monitor the brightness of many YSOs over a long period of time. ...
Course Materials - Weber State University
... One of the simplest and yet most confusing astronomical issues is the 'reason for the seasons'. Years ago, a group of film-makers went to a graduation ceremony at Harvard University, and asked students AND FACULTY! what caused the seasons. Clearly, this would not be interesting if they all got it ri ...
... One of the simplest and yet most confusing astronomical issues is the 'reason for the seasons'. Years ago, a group of film-makers went to a graduation ceremony at Harvard University, and asked students AND FACULTY! what caused the seasons. Clearly, this would not be interesting if they all got it ri ...
The Classification of Stellar Spectra
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
Complete Lecture Notes (pdf file)
... • Individual stars • Binary systems • Star clusters....these reveal how stars evolve with time • Nuclear physics...energy source, synthesis of heavy elements No direct information about physical conditions in stellar interiors (except from helioseismology and solar neutrinos) No direct evidence for ...
... • Individual stars • Binary systems • Star clusters....these reveal how stars evolve with time • Nuclear physics...energy source, synthesis of heavy elements No direct information about physical conditions in stellar interiors (except from helioseismology and solar neutrinos) No direct evidence for ...
Shortв•`lived radioactivity in the early solar system: The Superв•`AGB
... Soni (2006) pollution of 26Al due to the winds of lowmass AGB stars (initial masses lower than approximately 1.5 Mx) and Wolf-Rayet stars (initial masses higher than approximately 60 Mx) would have left no signature in the O isotopic composition. These two stellar sources do not produce 60Fe and to ...
... Soni (2006) pollution of 26Al due to the winds of lowmass AGB stars (initial masses lower than approximately 1.5 Mx) and Wolf-Rayet stars (initial masses higher than approximately 60 Mx) would have left no signature in the O isotopic composition. These two stellar sources do not produce 60Fe and to ...
GRB EXPERIMENT
... after its formation • Coupled with rapid rotation (~1 ms period), this makes the neutron star a likely site for dynamo action • If the rotation period is less than the convective overturn time, magnetic field amplification is possible • In principle, B ~ 3 x 1017 G can be generated (magnetic field e ...
... after its formation • Coupled with rapid rotation (~1 ms period), this makes the neutron star a likely site for dynamo action • If the rotation period is less than the convective overturn time, magnetic field amplification is possible • In principle, B ~ 3 x 1017 G can be generated (magnetic field e ...
Galactic Archaeology: Current Surveys
... reveals that these stars formed, and thus reflect conditions, at redshifts greater than 2. These stars retain some memory of the initial early conditions at which they form, and thus the early stages of galaxy evolution. The chemical elemental abundances in the stellar photospheres of main sequence ...
... reveals that these stars formed, and thus reflect conditions, at redshifts greater than 2. These stars retain some memory of the initial early conditions at which they form, and thus the early stages of galaxy evolution. The chemical elemental abundances in the stellar photospheres of main sequence ...
A search for a new class of pulsating DA white dwarf stars in the DB
... Most importantly in the context of this discussion: gravitational settling stratifies the structure of white dwarf stars, and in the presence of such strong gravitational fields it does so quickly. In the absence of any mixing – particularly in the absence of convection – we would expect all white d ...
... Most importantly in the context of this discussion: gravitational settling stratifies the structure of white dwarf stars, and in the presence of such strong gravitational fields it does so quickly. In the absence of any mixing – particularly in the absence of convection – we would expect all white d ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.