7. Debris disk model basics
... where α = 6.24x10-4(M*/Msun)β AU2/yr • So time for a particle to migrate in from a1 to a2 is tpr = 400(Msun/M*)[a12 – a22]/β years • On their way in particles can become trapped in resonance with interior planets, or be scattered, or accreted, or pass through secular resonances… • Large particles ...
... where α = 6.24x10-4(M*/Msun)β AU2/yr • So time for a particle to migrate in from a1 to a2 is tpr = 400(Msun/M*)[a12 – a22]/β years • On their way in particles can become trapped in resonance with interior planets, or be scattered, or accreted, or pass through secular resonances… • Large particles ...
Chapter 10
... chapter on wheat and flour. In our discussion of the birth and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of ...
... chapter on wheat and flour. In our discussion of the birth and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of ...
absorption lines
... chapter on wheat and flour. In our discussion of the birth and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of ...
... chapter on wheat and flour. In our discussion of the birth and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of ...
Zinc Carbonate - Prairie Mud Service
... Wear suitable protection for eyes and skin when handling. Use with adequate ventilation. Avoid contact with incompatible material. Store in cool, dry, well-ventilated area away from sources of heat, initiation and sparks. Eye wash and safety showers should be easily accessible and in proper operatin ...
... Wear suitable protection for eyes and skin when handling. Use with adequate ventilation. Avoid contact with incompatible material. Store in cool, dry, well-ventilated area away from sources of heat, initiation and sparks. Eye wash and safety showers should be easily accessible and in proper operatin ...
The Interstellar Medium
... a. The Sun is producing calcium and iron. b. The Sun is consuming hydrogen, carbon, and oxygen. c. The heavier elements on the Sun have settled toward its center. d. The absorption lines of calcium and iron are difficult to detect at low temperature. e. Calcium and iron are in dust grains of the int ...
... a. The Sun is producing calcium and iron. b. The Sun is consuming hydrogen, carbon, and oxygen. c. The heavier elements on the Sun have settled toward its center. d. The absorption lines of calcium and iron are difficult to detect at low temperature. e. Calcium and iron are in dust grains of the int ...
The Southern Winter PDF
... exposed and, with a temperature of over 220,000 degrees C, it is violently hot, with most of the radiation being emitted in the extreme ultraviolet part of the spectrum. This causes the expanding outer layers of the star to glow in their characteristic colors. The image reveals a complex history of ...
... exposed and, with a temperature of over 220,000 degrees C, it is violently hot, with most of the radiation being emitted in the extreme ultraviolet part of the spectrum. This causes the expanding outer layers of the star to glow in their characteristic colors. The image reveals a complex history of ...
3D maps of the local interstellar medium: searching for the imprints
... color excess measurements towards 23,000 stars within 2,000 pc has been inverted by means of a Bayesian technique devised by Vergely (2001), to produce a 3D distribution of differential reddening (Lallement et al, 2014). Figure 1 is a horizontal cut in the computed 3D distribution, here along the Ga ...
... color excess measurements towards 23,000 stars within 2,000 pc has been inverted by means of a Bayesian technique devised by Vergely (2001), to produce a 3D distribution of differential reddening (Lallement et al, 2014). Figure 1 is a horizontal cut in the computed 3D distribution, here along the Ga ...
American Scientist
... it is orbited by five exoplanets within a distance a third the size of Mercury’s orbit. Perhaps the most puzzling case study comes from the Kepler-36 system. Two planets are found at roughly the same distance from the star: one with a density less than that of water, whereas the other is as dense as ...
... it is orbited by five exoplanets within a distance a third the size of Mercury’s orbit. Perhaps the most puzzling case study comes from the Kepler-36 system. Two planets are found at roughly the same distance from the star: one with a density less than that of water, whereas the other is as dense as ...
Educational Brief
... about 300 light years in radius and is filled with extremely low density gas (about 0.001 gas atoms per cubic centimeter) - this is much less dense than the ISM surrounding it. The coffee mug that would contain about 500 hydrogen atoms in the average ISM would only contain 1 hydrogen atom (or maybe ...
... about 300 light years in radius and is filled with extremely low density gas (about 0.001 gas atoms per cubic centimeter) - this is much less dense than the ISM surrounding it. The coffee mug that would contain about 500 hydrogen atoms in the average ISM would only contain 1 hydrogen atom (or maybe ...
The Intricate Role of Cold Gas and Dust in Galaxy Evolution at Early
... …at z>3, no direct measurements are available (below bright end) reason: limited sensitivity/source confusion of submm surveys ! how can we measure dust-obscured part of the cosmic SF history?! ...
... …at z>3, no direct measurements are available (below bright end) reason: limited sensitivity/source confusion of submm surveys ! how can we measure dust-obscured part of the cosmic SF history?! ...
2_ISM - UCT Astronomy Department
... - derived from looking at pairs of stellar spectra with similar temperatures but different foreground extinctions. - The general extinction curve within each of the Milky Way, LMC, and SMC is fairly well defined - The overall increase to shorter wavelengths (approximately with absorption in magnitud ...
... - derived from looking at pairs of stellar spectra with similar temperatures but different foreground extinctions. - The general extinction curve within each of the Milky Way, LMC, and SMC is fairly well defined - The overall increase to shorter wavelengths (approximately with absorption in magnitud ...
11/17/2011 1 Ch. 27 Notes: Nebular Hypothesis The Nebular
... • A rotating cloud of gas and dust condensed to form the sun and surrounding planets. ...
... • A rotating cloud of gas and dust condensed to form the sun and surrounding planets. ...
m V
... • Light from a nearby star is scattered by dust grains into the line of sight • Colour is blue, as blue light is the most readily scattered • Scattering of light from blue stars, usually type B; spectrum is also of this type, i.e. absorption lines • Light is often highly polarized (20 – 30 per cent) ...
... • Light from a nearby star is scattered by dust grains into the line of sight • Colour is blue, as blue light is the most readily scattered • Scattering of light from blue stars, usually type B; spectrum is also of this type, i.e. absorption lines • Light is often highly polarized (20 – 30 per cent) ...
The absence of CO from the dust peak around ϵ Eri
... in the beam. If the emission from the ESE peak fills the JCMT beam, and if this peak holds 15 per cent of all material in the disc (Greaves et al. 1998), then the disc contains a total CO mass of <2.2 × 1017 kg (3σ ). Any shielding afforded the CO molecules by dust in the ESE peak will be weaker els ...
... in the beam. If the emission from the ESE peak fills the JCMT beam, and if this peak holds 15 per cent of all material in the disc (Greaves et al. 1998), then the disc contains a total CO mass of <2.2 × 1017 kg (3σ ). Any shielding afforded the CO molecules by dust in the ESE peak will be weaker els ...
02-Physics
... collectively as interstellar dust. They consist mainly of the elements carbon (C) or silicon (Si) with H, O, Mg and Fe in the form of ices, silicates, graphite, metals and organic compounds. The Milky Way contains vast lanes of dust which, being dark, were originally thought to be due to the absence ...
... collectively as interstellar dust. They consist mainly of the elements carbon (C) or silicon (Si) with H, O, Mg and Fe in the form of ices, silicates, graphite, metals and organic compounds. The Milky Way contains vast lanes of dust which, being dark, were originally thought to be due to the absence ...
Document
... • Another method would be to study the Doppler shift of the light of the star as it “wobbled” from the effects of the planet ...
... • Another method would be to study the Doppler shift of the light of the star as it “wobbled” from the effects of the planet ...
CML_DPS_PressBriefing_10Oct2006
... 9P/Tempel 1 or C/Hale-Bopp 1995 O1 and comet-dominated YSO HD100546. It lacks carbonaceous and ferrous materials but includes small icy grains. - The composition of the HD 69830 dust resembles that of a disrupted P or D-type asteroid. The amount of mass responsible for the observed emission is the e ...
... 9P/Tempel 1 or C/Hale-Bopp 1995 O1 and comet-dominated YSO HD100546. It lacks carbonaceous and ferrous materials but includes small icy grains. - The composition of the HD 69830 dust resembles that of a disrupted P or D-type asteroid. The amount of mass responsible for the observed emission is the e ...
Lecture 13 - Star Formation
... luminosity of the Sun. The star's lifetime will be ____ times that of Sun. A) 32 B) 4 C) 1 D) ¼ E) 1/32 ...
... luminosity of the Sun. The star's lifetime will be ____ times that of Sun. A) 32 B) 4 C) 1 D) ¼ E) 1/32 ...
The Origin and Evolution of Dust in Galaxies
... High-z galaxies Lower metallicities do not hamper dust formation in AGB stars Origins of dust in high-z galaxies are still open question. Dust mass in high-z galaxies may be explained, if both SNe and AGB stars contribute dust formation The orign and evolution of dust in galaxies ...
... High-z galaxies Lower metallicities do not hamper dust formation in AGB stars Origins of dust in high-z galaxies are still open question. Dust mass in high-z galaxies may be explained, if both SNe and AGB stars contribute dust formation The orign and evolution of dust in galaxies ...
Historic mass loss from the RS Ophiuchi system
... Stars with an initial mass between ∼ 1 and ∼ 40 M¯ become hydrogen/heliumshell-burning Asymptotic Giant Branch (AGB) stars or core-helium-burning red supergiants (RSG). These phases are characterised by cool, molecular atmospheres giving rise to M spectral types (S or C for some chemically peculiar ...
... Stars with an initial mass between ∼ 1 and ∼ 40 M¯ become hydrogen/heliumshell-burning Asymptotic Giant Branch (AGB) stars or core-helium-burning red supergiants (RSG). These phases are characterised by cool, molecular atmospheres giving rise to M spectral types (S or C for some chemically peculiar ...
The Interstellar Medium
... • Large fraction of the volume (~50%). • Emission lines in the ultraviolet, e.g., O VI ...
... • Large fraction of the volume (~50%). • Emission lines in the ultraviolet, e.g., O VI ...
Collapse: Method 2
... since the magnetic field is only tied to the ions, and the ions slip through the molecules. ...
... since the magnetic field is only tied to the ions, and the ions slip through the molecules. ...
interstellar dust - Ira-Inaf
... The study of dust is a many-faceted research topic that brings together different scientific fields: physics (solid-state, electromagnetic theory, surface physics, statistical physics, thermal physics), fractal mathematics, chemistry (chemical reactions on grain surfaces), meteoritics, as well as ...
... The study of dust is a many-faceted research topic that brings together different scientific fields: physics (solid-state, electromagnetic theory, surface physics, statistical physics, thermal physics), fractal mathematics, chemistry (chemical reactions on grain surfaces), meteoritics, as well as ...
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.