![The Nature of Science](http://s1.studyres.com/store/data/008085910_1-3eebec834eb7b9033c449ebe2c391750-300x300.png)
Five New Giant Exoplanets from the California
... and orbital resonances (Mayor & Udry 2008; Marcy et al. 2008). The hot jupiters have received the most attention, observationally and theoretically, yielding extraordinary information about their chemical composition, internal structure, atmospheric behavior. However most known gas giant planets orb ...
... and orbital resonances (Mayor & Udry 2008; Marcy et al. 2008). The hot jupiters have received the most attention, observationally and theoretically, yielding extraordinary information about their chemical composition, internal structure, atmospheric behavior. However most known gas giant planets orb ...
Rotation - Indiana University Astronomy
... Alternative magnetic field indicators: collimated jets and energetic winds – Jets and winds are likely launched from the disk-magnetosphere boundary – Such winds are ubiquitous among low mass (M < 2 Msun) accreting PMS stars – Direct evidence of jets found among accreting stars as massive as M ~ 10 ...
... Alternative magnetic field indicators: collimated jets and energetic winds – Jets and winds are likely launched from the disk-magnetosphere boundary – Such winds are ubiquitous among low mass (M < 2 Msun) accreting PMS stars – Direct evidence of jets found among accreting stars as massive as M ~ 10 ...
Beatrice Muriel Hill Tinsley
... organized by Robert Williams, who very appropriately won the 1998 Tinsley prize for this work. Did anybody ever solve the cosmology problem? Yes, but not primarily bylooking at distant galaxies, which we now study to understand how we got here. Instead, observations of distant supernovae, the cosmic ...
... organized by Robert Williams, who very appropriately won the 1998 Tinsley prize for this work. Did anybody ever solve the cosmology problem? Yes, but not primarily bylooking at distant galaxies, which we now study to understand how we got here. Instead, observations of distant supernovae, the cosmic ...
White Dwarf Stars
... around to see such an alien sky is another question: All life on Earth would have been obliterated when the Sun entered its red-giant stage a billion years earlier. The white dwarf will endure for many billions of years afterward as a small monument to our solar system. Our Sun may be billions of ye ...
... around to see such an alien sky is another question: All life on Earth would have been obliterated when the Sun entered its red-giant stage a billion years earlier. The white dwarf will endure for many billions of years afterward as a small monument to our solar system. Our Sun may be billions of ye ...
Star Formation in the Milky Way - HubbleSOURCE
... http://www.astro.ex.ac.uk/people/mbate/Cluster/index.html ...
... http://www.astro.ex.ac.uk/people/mbate/Cluster/index.html ...
THE YELLOW SUPERGIANT PROGENITOR OF THE TYPE II
... Johnson–Cousins filters. In the case of the U-band, however, the difference between the F 336W filter and the Johnson U is non-negligible. Using synthetic photometry of Potsdam W-R model SEDs (Gräfener et al. 2002), we find a U − F 336W color difference of 0.55±0.2 mag. Applying this to the progeni ...
... Johnson–Cousins filters. In the case of the U-band, however, the difference between the F 336W filter and the Johnson U is non-negligible. Using synthetic photometry of Potsdam W-R model SEDs (Gräfener et al. 2002), we find a U − F 336W color difference of 0.55±0.2 mag. Applying this to the progeni ...
Luminosity and magnitude
... Lets make this difficult (actually the ancient Greeks are to blame) • Around second century B.C.E., Hipparchus scaled naked eye stars into a ranking of 1 to 6 ( brightest to least bright). • 1 – 6 range spans a factor of 100 in apparent brightness. ( a 1st magnitude star is 100 X brighter than a 6t ...
... Lets make this difficult (actually the ancient Greeks are to blame) • Around second century B.C.E., Hipparchus scaled naked eye stars into a ranking of 1 to 6 ( brightest to least bright). • 1 – 6 range spans a factor of 100 in apparent brightness. ( a 1st magnitude star is 100 X brighter than a 6t ...
mass loss and stellar evolution
... • Mass Loss rate during the 20-yr eruption > 0.5 M yr -1. (Probably much higher, since proper motions indicate a small range of ejection dates.) Lines are saturated! • HUGE amount of Kinetic Energy ( ½mv2=1050 ergs. But this is a lower limit...) ...
... • Mass Loss rate during the 20-yr eruption > 0.5 M yr -1. (Probably much higher, since proper motions indicate a small range of ejection dates.) Lines are saturated! • HUGE amount of Kinetic Energy ( ½mv2=1050 ergs. But this is a lower limit...) ...
Dark Stars: Dark Matter annihilation can power the first stars
... billion times as bright as the Sun • This new phase of stellar evolution lasts millions to billions of years (possibly even to today) ...
... billion times as bright as the Sun • This new phase of stellar evolution lasts millions to billions of years (possibly even to today) ...
The DB gap and a new class of pulsating white dwarfs
... of white dwarfs with helium dominant atmospheres are described and a new class of pulsating white dwarfs, named the hot-DAV stars, is predicted from these scenarios. One pulsating DA white dwarf, being consistent with the prediction, has been discovered indeed. ...
... of white dwarfs with helium dominant atmospheres are described and a new class of pulsating white dwarfs, named the hot-DAV stars, is predicted from these scenarios. One pulsating DA white dwarf, being consistent with the prediction, has been discovered indeed. ...
Chapter 5
... layers that contain gases and, optionally, clouds or hazes. Here, we use the term ’haze’ for optically thin layers of submicron–sized particles, while ’clouds’ are thicker and composed of larger particles. The model atmospheres are bounded below by black surfaces, i.e. no light is entering the atmos ...
... layers that contain gases and, optionally, clouds or hazes. Here, we use the term ’haze’ for optically thin layers of submicron–sized particles, while ’clouds’ are thicker and composed of larger particles. The model atmospheres are bounded below by black surfaces, i.e. no light is entering the atmos ...
Astronomy Astrophysics
... that spectroscopic and photometric observations bring a strong constraint on this parameter (see discussion in M07), it does not benefit from the fact that the shape of the transit is not governed by the primary radius R∗ but by the density of the primary ρ∗ (Seager & Mallén-Ornelas 2003). Instead o ...
... that spectroscopic and photometric observations bring a strong constraint on this parameter (see discussion in M07), it does not benefit from the fact that the shape of the transit is not governed by the primary radius R∗ but by the density of the primary ρ∗ (Seager & Mallén-Ornelas 2003). Instead o ...
Chapter 23 The Milky Way Galaxy
... •Recall the solution to the “solar neutrino problem”, that neutrinos have a tiny bit of mass. Neutrinos turn out to be the most abundant particle in the universe (more than even photons). But falls short by an order of magnitude. A “weird subatomic particle” is the most (only?) favored candidate. Bu ...
... •Recall the solution to the “solar neutrino problem”, that neutrinos have a tiny bit of mass. Neutrinos turn out to be the most abundant particle in the universe (more than even photons). But falls short by an order of magnitude. A “weird subatomic particle” is the most (only?) favored candidate. Bu ...
Accretion Processes of Binaries of White Dwarfs
... Binarity of the central star system? • Severe mass loss rate through slow stellar wind from the giant. • Fast stellar wind from the white dwarf component • Collision of slow stellar wind and fast wind ...
... Binarity of the central star system? • Severe mass loss rate through slow stellar wind from the giant. • Fast stellar wind from the white dwarf component • Collision of slow stellar wind and fast wind ...
The Chemical Composition of Exoplanet
... A significant portion of stars occur as binary systems, in which two stellar components orbit a common center of mass. As the number of known exoplanet systems continues to grow, some binary systems are now known to harbor planets around one or both stellar components. As a first look into compositi ...
... A significant portion of stars occur as binary systems, in which two stellar components orbit a common center of mass. As the number of known exoplanet systems continues to grow, some binary systems are now known to harbor planets around one or both stellar components. As a first look into compositi ...
here - The Planetary Chemistry Laboratory
... mainly photosphere; also sunspots, solar flares, solar wind ...
... mainly photosphere; also sunspots, solar flares, solar wind ...
An Updated Ultraviolet Calibration for the Swift/UVOT
... bands in the optical (v, b and u) and ultraviolet (uvw1, uvm2 and uvw2) ranges. There are also two grisms for low resolution spectroscopy. Details about the instrument design and performance can be found in [4] and [5]. The in-orbit photometric calibration given in [5] was based on the ground calibr ...
... bands in the optical (v, b and u) and ultraviolet (uvw1, uvm2 and uvw2) ranges. There are also two grisms for low resolution spectroscopy. Details about the instrument design and performance can be found in [4] and [5]. The in-orbit photometric calibration given in [5] was based on the ground calibr ...
Chapter 5 Nuclear reactions in stars
... 6.1.1 Timescales and initial conditions Let’s further analyse the equations. Three kinds of time derivatives appear: • ∂2 r/∂t2 in eq. (6.2), which describes hydrodynamical changes to the stellar structure. These occur on the dynamical timescale τdyn which as we have seen is very short. Thus we can ...
... 6.1.1 Timescales and initial conditions Let’s further analyse the equations. Three kinds of time derivatives appear: • ∂2 r/∂t2 in eq. (6.2), which describes hydrodynamical changes to the stellar structure. These occur on the dynamical timescale τdyn which as we have seen is very short. Thus we can ...
The LMC transition star R84 and the core of the LH 39 OB association
... astrometric results are summarized in Table 2. Note that the magnitudes of stars # 34 to #38 were obtained by aperture photometry. Despite the impression of perfection first felt when looking at the deconvolved images, one has to remember that it is a model of the reality constructed from imperfect ...
... astrometric results are summarized in Table 2. Note that the magnitudes of stars # 34 to #38 were obtained by aperture photometry. Despite the impression of perfection first felt when looking at the deconvolved images, one has to remember that it is a model of the reality constructed from imperfect ...
Chapter 16 Option E: ASTROPHYSICS
... Our planet, Earth, is an insigniicant object orbiting an insigniicant star, the Sun. he Sun is situated in one arm of an insigniicant galaxy, the Milky Way, which contains around 200 billion stars. he Milky Way measures about 105 light years from one end to the other yet this enormous distance is ti ...
... Our planet, Earth, is an insigniicant object orbiting an insigniicant star, the Sun. he Sun is situated in one arm of an insigniicant galaxy, the Milky Way, which contains around 200 billion stars. he Milky Way measures about 105 light years from one end to the other yet this enormous distance is ti ...
L103 A NEW MILKY WAY DWARF SATELLITE IN CANES
... of the Milky Way. Together with the two dwarf irregulars (the Large and Small Magellanic Clouds), these make up all the known satellite galaxies of the Milky Way. The dSphs have such low surface brightness that they have often been found serendipitously. For example, while Sextans (Irwin et al. 1990 ...
... of the Milky Way. Together with the two dwarf irregulars (the Large and Small Magellanic Clouds), these make up all the known satellite galaxies of the Milky Way. The dSphs have such low surface brightness that they have often been found serendipitously. For example, while Sextans (Irwin et al. 1990 ...
Through Hubble`s Eye - Arizona State University
... Astronomers cannot see the very edge of the universe. Not yet. What light may exist there is so young that it comes from a time when the universe was not much more than a warm bath of neutral hydrogen gas. The first few stars and galaxies formed in this period are concealed from us today by this gas ...
... Astronomers cannot see the very edge of the universe. Not yet. What light may exist there is so young that it comes from a time when the universe was not much more than a warm bath of neutral hydrogen gas. The first few stars and galaxies formed in this period are concealed from us today by this gas ...
Metallicity maps
... Ram-pressure stripping can produce considerably more metals than galactic winds (depending on cluster mass and other cluster properties) Schindler et al. 2005, Kapferer et al. 2007, 2009 ...
... Ram-pressure stripping can produce considerably more metals than galactic winds (depending on cluster mass and other cluster properties) Schindler et al. 2005, Kapferer et al. 2007, 2009 ...
Available online www.jsaer.com Journal of Scientific and
... energy creation, colours and formation of stars, which may answer some questions about these shiny heavenly hot objects. A retrospect of literatures on stars concerning their energy creation, colours and formation A lot of research literatures have been published about stars. This section is a retro ...
... energy creation, colours and formation of stars, which may answer some questions about these shiny heavenly hot objects. A retrospect of literatures on stars concerning their energy creation, colours and formation A lot of research literatures have been published about stars. This section is a retro ...
Planetary nebula
![](https://commons.wikimedia.org/wiki/Special:FilePath/NGC6543.jpg?width=300)
A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives. The word ""nebula"" is Latin for mist or cloud and the term ""planetary nebula"" is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to resemble the rounded shapes of planets. Herschel's name for these objects was popularly adopted and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.A mechanism for formation of most planetary nebulae is thought to be the following: at the end of the star's life, during the red giant phase, the outer layers of the star are expelled by strong stellar winds. Eventually, after most of the red giant's atmosphere is dissipated, the exposed hot, luminous core emits ultraviolet radiation to ionize the ejected outer layers of the star. Absorbed ultraviolet light energises the shell of nebulous gas around the central star, appearing as a bright coloured planetary nebula at several discrete visible wavelengths.Planetary nebulae may play a crucial role in the chemical evolution of the Milky Way, returning material to the interstellar medium from stars where elements, the products of nucleosynthesis (such as carbon, nitrogen, oxygen and neon), have been created. Planetary nebulae are also observed in more distant galaxies, yielding useful information about their chemical abundances.In recent years, Hubble Space Telescope images have revealed many planetary nebulae to have extremely complex and varied morphologies. About one-fifth are roughly spherical, but the majority are not spherically symmetric. The mechanisms which produce such a wide variety of shapes and features are not yet well understood, but binary central stars, stellar winds and magnetic fields may play a role.