1 Sun Stars Planets. Problem Sheet I
... 4. (a) A binary star system consists of stars of masses m1 and m2 moving in circular orbits of radii a1 and a2 about their common centre of mass. The orbital period is P. Derive expressions for the mass ratio, m1 /m2 , and the sum of the masses, m1 + m2, in terms of a1 , a2 and P (or equivalently th ...
... 4. (a) A binary star system consists of stars of masses m1 and m2 moving in circular orbits of radii a1 and a2 about their common centre of mass. The orbital period is P. Derive expressions for the mass ratio, m1 /m2 , and the sum of the masses, m1 + m2, in terms of a1 , a2 and P (or equivalently th ...
Properties of Ellipticals and Spirals
... Ellipticals: Velocities of stars in ellipticals are more or less random Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrou ...
... Ellipticals: Velocities of stars in ellipticals are more or less random Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrou ...
From planetesimals to planetary systems: a hardles race
... Dust coagulation model PROs: Smooth grow of larger bodies Reliable collisional model Initial size distribution of any kind Robust (it does not depend much on initial parameters) It can overcome the 1-m catastrophe ...
... Dust coagulation model PROs: Smooth grow of larger bodies Reliable collisional model Initial size distribution of any kind Robust (it does not depend much on initial parameters) It can overcome the 1-m catastrophe ...
s-process
... formation of the Milky Way and its structural components The origin of the elements – back to B2FH! A stroll through the Periodic Table A timeline of Galactic chemical enrichment What does it all mean? ...
... formation of the Milky Way and its structural components The origin of the elements – back to B2FH! A stroll through the Periodic Table A timeline of Galactic chemical enrichment What does it all mean? ...
The solar system
... In fact, that doesn't give a better approximation: the result, far from being improved, gets worse. •Convergence problems don't worry mathematicians before CAUCHY. LAPLACE's calculations were limited to the first terms. It could be hoped that expanding in a power series until a high rank would give ...
... In fact, that doesn't give a better approximation: the result, far from being improved, gets worse. •Convergence problems don't worry mathematicians before CAUCHY. LAPLACE's calculations were limited to the first terms. It could be hoped that expanding in a power series until a high rank would give ...
Stellar Continua
... I. The Paschen Continuum • The Paschen continuum slope (B-V) is a good temperature indicator • Varies smoothly with changing temperature • Slope is negative (blue is brighter) for hot stars and positive (visual is brighter) for cooler stars • B-V works as a temperature indicator from 3500K to 9000K ...
... I. The Paschen Continuum • The Paschen continuum slope (B-V) is a good temperature indicator • Varies smoothly with changing temperature • Slope is negative (blue is brighter) for hot stars and positive (visual is brighter) for cooler stars • B-V works as a temperature indicator from 3500K to 9000K ...
PowerPoint format
... • Near infrared imaging and spectroscopy at the highest possible spatial resolution • Gemini advantage: diffraction-limited performance (or near to) in the near-infrared. ...
... • Near infrared imaging and spectroscopy at the highest possible spatial resolution • Gemini advantage: diffraction-limited performance (or near to) in the near-infrared. ...
Earth, Sun, Moon System
... Composition of Your Planet and its Appearance: What type of planet is it (is it rocky or a gas giant)? What is its internal composition? What does your planet look like? Moons: If there are moons orbiting your planet, describe them and when they were discovered. Rings: If there are rings orbiting yo ...
... Composition of Your Planet and its Appearance: What type of planet is it (is it rocky or a gas giant)? What is its internal composition? What does your planet look like? Moons: If there are moons orbiting your planet, describe them and when they were discovered. Rings: If there are rings orbiting yo ...
Recipes for ULX formation: necessary ingredients and garnishments
... Myr (Portegies Zwart & McMillan 2002). However, we have argued that there is no longer a compelling need to invoke intermediate-mass BHs in ULXs, and that the upper mass limit is likely to be somewhere between 50 and 200M . Correspondingly, if dynamical collapse and merger processes are still neede ...
... Myr (Portegies Zwart & McMillan 2002). However, we have argued that there is no longer a compelling need to invoke intermediate-mass BHs in ULXs, and that the upper mass limit is likely to be somewhere between 50 and 200M . Correspondingly, if dynamical collapse and merger processes are still neede ...
ABOUT PARALLAX AND… CONSTELLATIONS Abstract
... astrometric and two-colour photometric properties of some 400,000 additional stars to a somewhat lower precision. ESA’s Hipparcos mission exceeded all expectations and catalogued more than 100,000 stars to very high precision, and more than 1 million to lesser precision. Hipparcos was ...
... astrometric and two-colour photometric properties of some 400,000 additional stars to a somewhat lower precision. ESA’s Hipparcos mission exceeded all expectations and catalogued more than 100,000 stars to very high precision, and more than 1 million to lesser precision. Hipparcos was ...
Fact Sheet - NASA Spitzer Space Telescope
... nearby stars, thought to be signposts of planetary system formation. It will also provide new insights into the birth process of stars, an event normally hidden behind veils of cosmic dust. Outside our galaxy, the new infrared facility will help astronomers uncover the engines – thought to be galaxy ...
... nearby stars, thought to be signposts of planetary system formation. It will also provide new insights into the birth process of stars, an event normally hidden behind veils of cosmic dust. Outside our galaxy, the new infrared facility will help astronomers uncover the engines – thought to be galaxy ...
Than Our Eyes Can See - Cool Cosmos
... combined with the large numbers of stars in the Milky Way, lead to the conclusion that planet formation is probably a common phenomenon. ...
... combined with the large numbers of stars in the Milky Way, lead to the conclusion that planet formation is probably a common phenomenon. ...
ppt - Astronomy at Swarthmore College
... What is the mechanism by which massive stars produce x-rays? New results from the Chandra X-ray Observatory – high-resolution x-ray spectroscopy: measuring Doppler broadening in emission lines Testing different theories of x-ray production with new observations Modeling the underlying physics and c ...
... What is the mechanism by which massive stars produce x-rays? New results from the Chandra X-ray Observatory – high-resolution x-ray spectroscopy: measuring Doppler broadening in emission lines Testing different theories of x-ray production with new observations Modeling the underlying physics and c ...
On the migration of a system of protoplanets
... present position. The inward migration was eventually halted by tidal interaction with the star or through interaction with the stellar magnetosphere (Lin, Bodenheimer & Richardson 1996). The only extrasolar planetary system around a main-sequence star known so far (y And) consists of one planet at ...
... present position. The inward migration was eventually halted by tidal interaction with the star or through interaction with the stellar magnetosphere (Lin, Bodenheimer & Richardson 1996). The only extrasolar planetary system around a main-sequence star known so far (y And) consists of one planet at ...
A dust ring around Epsilon Eridani: analogue to the young Solar
... 8′′ ). The cavity region out to this distance has only 6 % of the total integrated flux. There is an apparent rise in flux density within r = 4.5′′ , which in the unsmoothed data appears to correspond to a small peak south of the star. However, the signal level in this region is uncertain, as it inc ...
... 8′′ ). The cavity region out to this distance has only 6 % of the total integrated flux. There is an apparent rise in flux density within r = 4.5′′ , which in the unsmoothed data appears to correspond to a small peak south of the star. However, the signal level in this region is uncertain, as it inc ...
On the migration of a system of protoplanets
... present position. The inward migration was eventually halted by tidal interaction with the star or through interaction with the stellar magnetosphere (Lin, Bodenheimer & Richardson 1996). The only extrasolar planetary system around a main-sequence star known so far (y And) consists of one planet at ...
... present position. The inward migration was eventually halted by tidal interaction with the star or through interaction with the stellar magnetosphere (Lin, Bodenheimer & Richardson 1996). The only extrasolar planetary system around a main-sequence star known so far (y And) consists of one planet at ...
Asteroseismic constraints on Asymmetric Dark Matter: Light particles
... modelling have stellar fundamental properties strongly constrained by photometric and spectroscopic observations. Within that subset, the best candidates are those for which astrometric observations are also available, for example stars observed by both Kepler and Hipparcos [52]. Thus, the ideal can ...
... modelling have stellar fundamental properties strongly constrained by photometric and spectroscopic observations. Within that subset, the best candidates are those for which astrometric observations are also available, for example stars observed by both Kepler and Hipparcos [52]. Thus, the ideal can ...
- ANU Repository
... smaller value. Importantly, MIMC does not require binning, which may blur important features in a distribution. Gaidos et al. (2014) used MIMC to estimate an occurrence f of 2.0 ± 0.3 for 1–4 R⊕ planets with orbital periods P < 180 d, a radius distribution that peaks at ∼1 R⊕ and a period distributi ...
... smaller value. Importantly, MIMC does not require binning, which may blur important features in a distribution. Gaidos et al. (2014) used MIMC to estimate an occurrence f of 2.0 ± 0.3 for 1–4 R⊕ planets with orbital periods P < 180 d, a radius distribution that peaks at ∼1 R⊕ and a period distributi ...
10 - Keele Astrophysics Group
... define a star’s position in the HR diagram. Certain spectral lines are not only temperaturesensitive but also gravity-sensitive. Such lines are used to further classify stars into luminosity classes (using roman numerals): supergiants (type I), giants (III), and mainsequence stars (V). The Sun for i ...
... define a star’s position in the HR diagram. Certain spectral lines are not only temperaturesensitive but also gravity-sensitive. Such lines are used to further classify stars into luminosity classes (using roman numerals): supergiants (type I), giants (III), and mainsequence stars (V). The Sun for i ...
On the Cosmic Nuclear Cycle and the Similarity of Nuclei and Stars
... [7–9] independently confirmed that the Sun selectively moves lighter ions into the photosphere, over the mass range of A=25–207 amu [8], leaving little doubt that the interior of the Sun is iron-rich [6] like the material that formed iron meteorites and iron cores of rocky planets at the birth of the ...
... [7–9] independently confirmed that the Sun selectively moves lighter ions into the photosphere, over the mass range of A=25–207 amu [8], leaving little doubt that the interior of the Sun is iron-rich [6] like the material that formed iron meteorites and iron cores of rocky planets at the birth of the ...
AN ATTEMPT To prove the MOTION OF THE EARTH FROM
... the Vulgar, especially as to the frame and fabrick of the World, which leave so deep an impression upon the fancy, that they are not without great pain and trouble obliterated: Others, as a further confirmation in their childish opinion, have been instructed in the Ptolomaick or Tichonick System, an ...
... the Vulgar, especially as to the frame and fabrick of the World, which leave so deep an impression upon the fancy, that they are not without great pain and trouble obliterated: Others, as a further confirmation in their childish opinion, have been instructed in the Ptolomaick or Tichonick System, an ...