9. Lectures on Star Formation.
... Birth process of a star can be divided into two main distinctive stages: Proto-star-phase: -Proto-stars still in process of attaining star-like structure. -Proto-stars accompanied by strong outflows and jets -Surrounded by accretion disks. Disk adding more mass onto the proto-star. -Proto-star hidd ...
... Birth process of a star can be divided into two main distinctive stages: Proto-star-phase: -Proto-stars still in process of attaining star-like structure. -Proto-stars accompanied by strong outflows and jets -Surrounded by accretion disks. Disk adding more mass onto the proto-star. -Proto-star hidd ...
Circumstellar Disks: the Formation and Evolution of
... • Our Solar System possesses second generation dust generated by sublimation of comets and collisions between asteroids and KBOs • There are exoplanetary systems that possess similar dust • In these systems, collisions between asteroids and comets is believed to generate dust • Whenever disks are ob ...
... • Our Solar System possesses second generation dust generated by sublimation of comets and collisions between asteroids and KBOs • There are exoplanetary systems that possess similar dust • In these systems, collisions between asteroids and comets is believed to generate dust • Whenever disks are ob ...
Between the Stars: Gas and Dust in Space
... The color of a gas gives us clues about its temperature and composition The red color commonly seen in interstellar gas comes from ionized hydrogen, or H II The proton recombines with an electron which then moves down to the lowest-energy orbit by emitting a red-wavelength photon H I refers to a neu ...
... The color of a gas gives us clues about its temperature and composition The red color commonly seen in interstellar gas comes from ionized hydrogen, or H II The proton recombines with an electron which then moves down to the lowest-energy orbit by emitting a red-wavelength photon H I refers to a neu ...
Untitled - Dommelroute
... thing happened after the formation of the solar system. The Sun and the planets were formed from a huge cloud of dust and gas. This dust and gas came together to form tiny clumps of rock, metal, and ice. These tiny clumps gathered into bigger clumps. After millions of years, these clumps were large ...
... thing happened after the formation of the solar system. The Sun and the planets were formed from a huge cloud of dust and gas. This dust and gas came together to form tiny clumps of rock, metal, and ice. These tiny clumps gathered into bigger clumps. After millions of years, these clumps were large ...
Chapter 13
... 5. Interstellar extinction is the effect by which starlight is blocked completely by interstellar material. 6. The light from distant stars is reddened by the dust through which it passes because dust grains scatter blue light more than red. The reddening caused by scattering is not the same as the ...
... 5. Interstellar extinction is the effect by which starlight is blocked completely by interstellar material. 6. The light from distant stars is reddened by the dust through which it passes because dust grains scatter blue light more than red. The reddening caused by scattering is not the same as the ...
Physics 306
... o HI clouds – clouds of neutral gas, 50-150 pc in diameter, few solar masses, 100K temp (low), 10- few hundred atom/cubic cm (high density) not ionized! *make up about 25% of interstellar mass o Intercloud medium – few thousand K, .1 atom/cubic cm (low density), IONIZED hydrogen (HII), in approx. e ...
... o HI clouds – clouds of neutral gas, 50-150 pc in diameter, few solar masses, 100K temp (low), 10- few hundred atom/cubic cm (high density) not ionized! *make up about 25% of interstellar mass o Intercloud medium – few thousand K, .1 atom/cubic cm (low density), IONIZED hydrogen (HII), in approx. e ...
الرابط الأصلي:
... The fact that its spectrum is identical to that of Sun, like the zodiacal light, enforces the conclusion that we are seeing sunlight reflected from dust grains in the plane of the solar system. There have been reports that under very favorable viewing conditions the zodiacal light extends to the geg ...
... The fact that its spectrum is identical to that of Sun, like the zodiacal light, enforces the conclusion that we are seeing sunlight reflected from dust grains in the plane of the solar system. There have been reports that under very favorable viewing conditions the zodiacal light extends to the geg ...
Outline - March 16, 2010 Interstellar Medium (ISM) Why should you
... The energy is gravitational. Half the gravitational energy goes into heating the collapsing clout, the other half escapes as light. The central object is called a “protostar”, and they are very ...
... The energy is gravitational. Half the gravitational energy goes into heating the collapsing clout, the other half escapes as light. The central object is called a “protostar”, and they are very ...
Great Migrations & other natural history tales
... telescopes with those obtained while combining several such telescopes into an interferometric array (this technique, long practiced by radio astronomers, allows us to achieve very good, low-angular resolution, observations). ...
... telescopes with those obtained while combining several such telescopes into an interferometric array (this technique, long practiced by radio astronomers, allows us to achieve very good, low-angular resolution, observations). ...
Beta Pictoris
... telescopes with those obtained while combining several such telescopes into an interferometric array (this technique, long practiced by radio astronomers, allows us to achieve very good, low-angular resolution, observations). ...
... telescopes with those obtained while combining several such telescopes into an interferometric array (this technique, long practiced by radio astronomers, allows us to achieve very good, low-angular resolution, observations). ...
SES4U ~ The Formation of Our Solar Systemstudentcopy
... negative buoyancy (silicate is hot enough to be plastic and "squishy" if not actually molten). – Conditions are HOT – volatile elements were lost to a significant degree. – Based on: • Asteroids – "unassembled" planets, – already differentiated into chemically different types. – Therefore, Protoplan ...
... negative buoyancy (silicate is hot enough to be plastic and "squishy" if not actually molten). – Conditions are HOT – volatile elements were lost to a significant degree. – Based on: • Asteroids – "unassembled" planets, – already differentiated into chemically different types. – Therefore, Protoplan ...
featured in the Arizona Daily Star
... they can’t visit a star to extract a sample of it. But there are ways to get a piece of a star and study it in the laboratory. That’s what I do — I study pieces of ancient stardust. But instead of using a telescope, I use a microscope to look for stardust inside meteorites. Over their lifetimes, sta ...
... they can’t visit a star to extract a sample of it. But there are ways to get a piece of a star and study it in the laboratory. That’s what I do — I study pieces of ancient stardust. But instead of using a telescope, I use a microscope to look for stardust inside meteorites. Over their lifetimes, sta ...
powerpoint - High Energy Physics at Wayne State
... 50 LY across •H II region (red) high-energy UV hits interstellar gas •dark dust filaments – extinction due to debris from supernovae •blue reflection nebula February 14, 2006 ...
... 50 LY across •H II region (red) high-energy UV hits interstellar gas •dark dust filaments – extinction due to debris from supernovae •blue reflection nebula February 14, 2006 ...
Chapter-3-Section-1-p.-64-67-Cornell
... where stars are born or where stars explode at the end of their lives o Gravity and pressure interact in a nebula to form stars ...
... where stars are born or where stars explode at the end of their lives o Gravity and pressure interact in a nebula to form stars ...
Signatures of planets and of planet formation in debris disks Mark
... Several white dwarfs have near-IR emission from hot dust close to the ~1Rsun tidal destruction radius (von Hippel et al. 2007; Farihi et al. 2009), some also have CaII emission from circumstellar gas at same location (Gaensicke et al. 2009), while more have metal polluted atmospheres from accretion ...
... Several white dwarfs have near-IR emission from hot dust close to the ~1Rsun tidal destruction radius (von Hippel et al. 2007; Farihi et al. 2009), some also have CaII emission from circumstellar gas at same location (Gaensicke et al. 2009), while more have metal polluted atmospheres from accretion ...
Metallicity, Age, and Mass of Star Forming Galaxies at z~3
... `One explanation for the widespread adoption of a mythological overlying screen of dust absorption in galaxies is a parallel with stellar astronomy, in which only grains along the line of sight to a star will extinguish the light.’ ...
... `One explanation for the widespread adoption of a mythological overlying screen of dust absorption in galaxies is a parallel with stellar astronomy, in which only grains along the line of sight to a star will extinguish the light.’ ...
Masers and high mass star formation Claire Chandler
... If you know flux density, dust temperature, distance to source, and opacity characteristics of dust, you can get Md. Assume dust to gas ratio and you get total mass of object. ...
... If you know flux density, dust temperature, distance to source, and opacity characteristics of dust, you can get Md. Assume dust to gas ratio and you get total mass of object. ...
Lecture 5: Molecular Clouds (2) Dense Cores
... also polarize radiation through dichroic extinction. This is because the particles are irregular structures that tend to rotate about their shortest axes. Grain material has a small electric charge and is paramagnetic " grains acquire a magnetic moment M that points along the axis of rotation. Inter ...
... also polarize radiation through dichroic extinction. This is because the particles are irregular structures that tend to rotate about their shortest axes. Grain material has a small electric charge and is paramagnetic " grains acquire a magnetic moment M that points along the axis of rotation. Inter ...
Chapter 18 The Interstellar Medium - University of Texas Astronomy
... “Nebula” is a general term used for fuzzy objects in the sky: Dark nebula: Dust cloud Emission nebula: Glows, due to emission lines from gas heated by hot young stars (a way to find where stars have recently formed). Emission nebulae generally glow red—this is the Hα line of hydrogen. But others shi ...
... “Nebula” is a general term used for fuzzy objects in the sky: Dark nebula: Dust cloud Emission nebula: Glows, due to emission lines from gas heated by hot young stars (a way to find where stars have recently formed). Emission nebulae generally glow red—this is the Hα line of hydrogen. But others shi ...
Formation of Stars
... UV and optical radiation. At the end of stage 2, the fragments are ~100 times the size of the solar system. Stage 3: The cloud fragment develops a hot core - from 100 K to 104 K. The gas density increases much faster in the core than at the surface. A photosphere develops. Size is about the size o ...
... UV and optical radiation. At the end of stage 2, the fragments are ~100 times the size of the solar system. Stage 3: The cloud fragment develops a hot core - from 100 K to 104 K. The gas density increases much faster in the core than at the surface. A photosphere develops. Size is about the size o ...
The Interstellar Medium (ch. 18) Interstellar Dust Grains
... generally has about the same composition as the sun and other stars (i.e. mostly H, some He, and ~1% heavier elements, consistent with stars forming from this gas), except that some elements are depleted , i.e. their abundances are low compared to stars. This is almost certainly because these elemen ...
... generally has about the same composition as the sun and other stars (i.e. mostly H, some He, and ~1% heavier elements, consistent with stars forming from this gas), except that some elements are depleted , i.e. their abundances are low compared to stars. This is almost certainly because these elemen ...
aspartic acid - West Liberty University
... Chemical Stability: Stable under normal conditions of use and storage. Incompatibility with other substances: May react violently or explosively with strong oxidizers. Reactivity: Avoid excessive heat, ignition sources, all incompatible materials, generation of dust. Hazardous Decomposition Products ...
... Chemical Stability: Stable under normal conditions of use and storage. Incompatibility with other substances: May react violently or explosively with strong oxidizers. Reactivity: Avoid excessive heat, ignition sources, all incompatible materials, generation of dust. Hazardous Decomposition Products ...
AST301.Ch18.InterstelMed - University of Texas Astronomy
... Grain size, shape, composition. Each dust grain is a solid particle ~1000 times bigger than an atom, containing on average ~109 atoms. These grains are elongated or very irregular in shape (Fig. 18.3); this is known from the way they “polarize” light—don’t worry if you don’t understand details of t ...
... Grain size, shape, composition. Each dust grain is a solid particle ~1000 times bigger than an atom, containing on average ~109 atoms. These grains are elongated or very irregular in shape (Fig. 18.3); this is known from the way they “polarize” light—don’t worry if you don’t understand details of t ...
Violent Adolescent Planet Caught Infrared Handed
... Rochester (New York) analyzed infrared spectra obtained by the Spitzer Space Telescope. They found a prominent peak in the spectrum at 9.3 micrometers, and two smaller ones at slightly lower and higher wavelengths. These peaks are consistent with the presence of SiO gas, a product expected to be pro ...
... Rochester (New York) analyzed infrared spectra obtained by the Spitzer Space Telescope. They found a prominent peak in the spectrum at 9.3 micrometers, and two smaller ones at slightly lower and higher wavelengths. These peaks are consistent with the presence of SiO gas, a product expected to be pro ...
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.