11 The Interstellar Medium
... b) remnants of stars that die by supernova. c) clouds of gas and dust in interstellar space. d) distant galaxies seen beyond our Milky Way. e) All of the above are correct. ...
... b) remnants of stars that die by supernova. c) clouds of gas and dust in interstellar space. d) distant galaxies seen beyond our Milky Way. e) All of the above are correct. ...
Extrasolar Kuiper Belt Dust Disks
... Dust particles are affected by radiation pressure, Poynting-Robertson and stellar wind drag, mutual collisions, and collisions with interstellar grains. All these processes contribute to make the lifetime of the dust particles significantly shorter than the age of the star. Therefore, it was realize ...
... Dust particles are affected by radiation pressure, Poynting-Robertson and stellar wind drag, mutual collisions, and collisions with interstellar grains. All these processes contribute to make the lifetime of the dust particles significantly shorter than the age of the star. Therefore, it was realize ...
Early stages of clustered star formation -massive dark clouds
... complete picture. They are expressed in units that are conveniently scalable to values appropriate for various objects. It is important to realise that mass (and density) play a crucial role in the time span of pre-stellar as well as stellar evolution. Density perturbations can move through molecula ...
... complete picture. They are expressed in units that are conveniently scalable to values appropriate for various objects. It is important to realise that mass (and density) play a crucial role in the time span of pre-stellar as well as stellar evolution. Density perturbations can move through molecula ...
Word format
... Current gas-grain chemical models of assorted regions in the interstellar medium must deal with several types of complexity. First among these is chemical complexity. Although most classes of gas-phase reactions are reasonably if not completely understood, processes occurring on dust particles are m ...
... Current gas-grain chemical models of assorted regions in the interstellar medium must deal with several types of complexity. First among these is chemical complexity. Although most classes of gas-phase reactions are reasonably if not completely understood, processes occurring on dust particles are m ...
Evolution of Circumstellar Disks Around Normal Stars
... dust in micron–sized grains. Similar studies by Weinberger et al. (2004) of stars in the β Pic moving group as well as TW Hya association (both ∼ 10 Myr old) uncovered only a handful of stars with mid–infrared excess emission. These results are being confirmed with cluster studies undertaken with th ...
... dust in micron–sized grains. Similar studies by Weinberger et al. (2004) of stars in the β Pic moving group as well as TW Hya association (both ∼ 10 Myr old) uncovered only a handful of stars with mid–infrared excess emission. These results are being confirmed with cluster studies undertaken with th ...
Chapter 1
... ‘visual’ and ‘photographic’ magnitude. The wavelength dependence of the starlight extinction could only be explained by small, solid particles that absorb starlight on a spectral range much broader than the discrete, narrow bands from transitions of specific atoms or molecules. In the end, these res ...
... ‘visual’ and ‘photographic’ magnitude. The wavelength dependence of the starlight extinction could only be explained by small, solid particles that absorb starlight on a spectral range much broader than the discrete, narrow bands from transitions of specific atoms or molecules. In the end, these res ...
A sound nebula: the origin of the Solar System in the field of a
... It consists of trillions of small objects composed of dust and water, ammonia and methane ice and it is believed that these objects were scattered outwards by the gas giants at the planetary formation stage and then acquired distant circular orbits (out to about one light year) as a result of gravi ...
... It consists of trillions of small objects composed of dust and water, ammonia and methane ice and it is believed that these objects were scattered outwards by the gas giants at the planetary formation stage and then acquired distant circular orbits (out to about one light year) as a result of gravi ...
High-Mass Star Formation
... Farther away than low-mass regions = low resolution Dense cores may be forming cluster of stars = SED dominated by most massive star = SED classification confused! Very broad linewidths consistent with turbulent gas ...
... Farther away than low-mass regions = low resolution Dense cores may be forming cluster of stars = SED dominated by most massive star = SED classification confused! Very broad linewidths consistent with turbulent gas ...
A sound nebula: the origin of the Solar System in the field of a
... It consists of trillions of small objects composed of dust and water, ammonia and methane ice and it is believed that these objects were scattered outwards by the gas giants at the planetary formation stage and then acquired distant circular orbits (out to about one light year) as a result of gravi ...
... It consists of trillions of small objects composed of dust and water, ammonia and methane ice and it is believed that these objects were scattered outwards by the gas giants at the planetary formation stage and then acquired distant circular orbits (out to about one light year) as a result of gravi ...
Solar system formation by accretion has no observational evidence
... here—terrestrial, gas and ice planets and all, one of the considered scenarios must have worked, and since I can show it wasn’t scenario A, it must have been B!’”16 With lack of experimental confirmation of accretion spanning several decades, what are we to make of confident descriptions of accretio ...
... here—terrestrial, gas and ice planets and all, one of the considered scenarios must have worked, and since I can show it wasn’t scenario A, it must have been B!’”16 With lack of experimental confirmation of accretion spanning several decades, what are we to make of confident descriptions of accretio ...
Microsoft Word 97
... and dust as well as some old stars. The disk is slightly warped at its ends, perhaps by an interaction with our satellite galaxies, the Magellanic Clouds. Our galaxy looks like a hat with a turned down brim. 1) It is very difficult for us to tell how the material is arranged in our galaxy’s disk. 2) ...
... and dust as well as some old stars. The disk is slightly warped at its ends, perhaps by an interaction with our satellite galaxies, the Magellanic Clouds. Our galaxy looks like a hat with a turned down brim. 1) It is very difficult for us to tell how the material is arranged in our galaxy’s disk. 2) ...
Brochure - Institut für Raumfahrtsysteme
... missions Cassini, Rosetta, Stardust, Ulysses, Bepi Colombo and LADEE. The major ongoing space mission with an enormous science return for cosmic dust research is the Cassini spacecraft at Saturn. Science planning, operations and data analysis of the dust sensor onboard Cassini is performed by an int ...
... missions Cassini, Rosetta, Stardust, Ulysses, Bepi Colombo and LADEE. The major ongoing space mission with an enormous science return for cosmic dust research is the Cassini spacecraft at Saturn. Science planning, operations and data analysis of the dust sensor onboard Cassini is performed by an int ...
Dust production in debris discs: constraints on the smallest grains
... Aims. We numerically investigate the importance of this effect to find out under which conditions it can leave a signature in the small-size end of a disc’s particle size distribution (PSD). An important part of this work is to map out, in a disc at steady-state, what is the most likely collisional o ...
... Aims. We numerically investigate the importance of this effect to find out under which conditions it can leave a signature in the small-size end of a disc’s particle size distribution (PSD). An important part of this work is to map out, in a disc at steady-state, what is the most likely collisional o ...
IR Universe
... horizontally across the image. Blue sources are cool stars within our Galaxy, which show an obvious concentration to the galactic plane and center. Yellow-green sources are galaxies which are basically uniformly distributed across the sky, but show an enhancement along a great circle above the galac ...
... horizontally across the image. Blue sources are cool stars within our Galaxy, which show an obvious concentration to the galactic plane and center. Yellow-green sources are galaxies which are basically uniformly distributed across the sky, but show an enhancement along a great circle above the galac ...
A Comment on “The Far Future of Exoplanet Direct Characterization
... dust particles in the solar neighborhood is not well constrained (Landgraf et al., 2000; Frisch et al., 2009; Krüger and Grün, 2009). Interstellar particles even larger than the largest inferred from the spacecraft dust detectors (of the order of 40µm in size) may have been detected by meteor radar ...
... dust particles in the solar neighborhood is not well constrained (Landgraf et al., 2000; Frisch et al., 2009; Krüger and Grün, 2009). Interstellar particles even larger than the largest inferred from the spacecraft dust detectors (of the order of 40µm in size) may have been detected by meteor radar ...
The early stages of planet formation Ormel, Christiaan Wessel
... How do planets form? It is a simple question but the answer involves an array of diverse physical processes — complex as well as fascinating. It requires, first of all, to realize what planets really are. For centuries, humans were mystified by the ‘wandering stars,’ moving relative to a sky compose ...
... How do planets form? It is a simple question but the answer involves an array of diverse physical processes — complex as well as fascinating. It requires, first of all, to realize what planets really are. For centuries, humans were mystified by the ‘wandering stars,’ moving relative to a sky compose ...
Dust formation in the winds of AGBs: the contribution at low
... TDU are different. TDU is accompanied by the increase in the surface abundance of carbon, and, to a smaller extent, of oxygen. The effects of HBB reflect proton-capture nucleosynthesis, and thus depend on the temperature at which HBB occurs. For temperatures ...
... TDU are different. TDU is accompanied by the increase in the surface abundance of carbon, and, to a smaller extent, of oxygen. The effects of HBB reflect proton-capture nucleosynthesis, and thus depend on the temperature at which HBB occurs. For temperatures ...
Article PDF - IOPscience
... systems are unlikely to detect significant numbers of meteors from debris disks such as Pictoris. However, we suggest improvements to radar systems that should allow for the detection of multiple examples of all three classes. Subject headings: dust, extinction — planetary systems: protoplanetary ...
... systems are unlikely to detect significant numbers of meteors from debris disks such as Pictoris. However, we suggest improvements to radar systems that should allow for the detection of multiple examples of all three classes. Subject headings: dust, extinction — planetary systems: protoplanetary ...
The Stellar Population Synthesis Technique Charlie Conroy Princeton
... Effects of Dust Assumptions on Mass Estimates: I – Stellar mass dependence on galaxy inclination – Should be uncorrelated – But heavily-used public stellar mass catalogs do ...
... Effects of Dust Assumptions on Mass Estimates: I – Stellar mass dependence on galaxy inclination – Should be uncorrelated – But heavily-used public stellar mass catalogs do ...
A cold detached dust envelope around an oxygen-rich Mira
... data. It is noted, however, that in the successful model fitting of the IRAS photometric and LRS data of the red 1n M stars we have to introduce either a detached inner boundary for the circumstellar dust envelope of silicate-type grains or some exotic optical properties of oxygen-rich dust grains w ...
... data. It is noted, however, that in the successful model fitting of the IRAS photometric and LRS data of the red 1n M stars we have to introduce either a detached inner boundary for the circumstellar dust envelope of silicate-type grains or some exotic optical properties of oxygen-rich dust grains w ...
GCR Neon Isotopic Abundances: Comparison with Wolf
... Wolf-Rayet Stars-The overabundance of 22Ne in OCRs may be a result of the acceleration of WR star material as first suggested by Casse and Paul [13]. It has been estimated that ~2xlO~5 solar masses of material per year is ejected from a typical WR star in high velocity winds [18, 37]. There are two ...
... Wolf-Rayet Stars-The overabundance of 22Ne in OCRs may be a result of the acceleration of WR star material as first suggested by Casse and Paul [13]. It has been estimated that ~2xlO~5 solar masses of material per year is ejected from a typical WR star in high velocity winds [18, 37]. There are two ...
Cosmic dust
Cosmic dust is dust which exists in space. It is for the most part a type of small dust particles which are a few molecules to 0.1 µm in size. A smaller fraction of all dust in space consists of larger refractory minerals that condensed as matter left the stars. It is called ""stardust"" and is included in a separate section below. The dust density in the local interstellar medium of the Local Bubble is approximately 10−6 × dust grain/m3 with each grain having a mass of approximately 10−17 kg.Cosmic dust can be further distinguished by its astronomical location: intergalactic dust, interstellar dust, interplanetary dust (such as in the zodiacal cloud) and circumplanetary dust (such as in a planetary ring). In the Solar System, interplanetary dust causes the zodiacal light. Sources of Solar System dust include comet dust, asteroidal dust, dust from the Kuiper belt, and interstellar dust passing through the Solar System. The terminology has no specific application for describing materials found on the planet Earth except for dust that has demonstrably fallen to Earth. By one estimate, as much as 40,000 tons of cosmic dust reaches the Earth's surface every year. In October 2011, scientists reported that cosmic dust contains complex organic matter (""amorphous organic solids with a mixed aromatic–aliphatic structure"") that could be created naturally, and rapidly, by stars.On August 14, 2014, scientists announced the collection of possible interstellar dust particles from the Stardust spacecraft since returning to Earth in 2006.