Dynamics
... flow increases the temperature difference between core and envelope, and a ‘gravithermal catastrophe’ ensues in which Tcore rises inexorably. The sequence of events that we have just described prevents any classical self-gravitating system, whether it be a star or a galaxy, from achieving thermal eq ...
... flow increases the temperature difference between core and envelope, and a ‘gravithermal catastrophe’ ensues in which Tcore rises inexorably. The sequence of events that we have just described prevents any classical self-gravitating system, whether it be a star or a galaxy, from achieving thermal eq ...
Scaling of Body Masses and Orbital Periods in the Solar System
... Within the last ten years several articles [2–6] were pub- can see that for sequently following couples of a body mass lished which confirm our statement that scaling is a widely M and an orbital period T the fractal dimension D is quite distributed phenomenon. Possibly, natural oscillations of mat- ...
... Within the last ten years several articles [2–6] were pub- can see that for sequently following couples of a body mass lished which confirm our statement that scaling is a widely M and an orbital period T the fractal dimension D is quite distributed phenomenon. Possibly, natural oscillations of mat- ...
Recent Developments in Physics Beyond the Standard
... if the β functions contain only the contributions from Standard Model particles, but it correctly reproduces the experimental value when one includes the quantum effects of the supersymmetric partners with masses in the 100 GeV–1 TeV range. Therefore, the theoretical motivations for low-energy supers ...
... if the β functions contain only the contributions from Standard Model particles, but it correctly reproduces the experimental value when one includes the quantum effects of the supersymmetric partners with masses in the 100 GeV–1 TeV range. Therefore, the theoretical motivations for low-energy supers ...
Key paper.
... and kinematic models21,22 confirm that, as suggested by photometric observations20, many TTs are accompanied by circumstellar disks that could be protoplanetary in nature23,24. Our new observations of MWC480 provide the strongest evidence to date for a rotating disk around a higher-mass counterpart ...
... and kinematic models21,22 confirm that, as suggested by photometric observations20, many TTs are accompanied by circumstellar disks that could be protoplanetary in nature23,24. Our new observations of MWC480 provide the strongest evidence to date for a rotating disk around a higher-mass counterpart ...
Chapter 12: The Life Cycle of Stars
... – Inert core of carbon – Surrounding shells: burning H and He • Star becomes very cool & luminous, expanding in size. • Gravity is very weak at stellar surface, leading to mass loss through a strong stellar wind (Phase #5). • Continuing contraction of the core leads to greater & greater l ...
... – Inert core of carbon – Surrounding shells: burning H and He • Star becomes very cool & luminous, expanding in size. • Gravity is very weak at stellar surface, leading to mass loss through a strong stellar wind (Phase #5). • Continuing contraction of the core leads to greater & greater l ...
15. Our Star - UC Berkeley Astronomy w
... in 5 Billion Years • Sun’s Core becomes pure helium! • No Hydrogen burning possible. • The Helium core begins to collapse. – H shell (around Helium) heats up and H fusion begins there. – Outer layers of the Sun expand. – The Sun enters red-giant phase of its life. ...
... in 5 Billion Years • Sun’s Core becomes pure helium! • No Hydrogen burning possible. • The Helium core begins to collapse. – H shell (around Helium) heats up and H fusion begins there. – Outer layers of the Sun expand. – The Sun enters red-giant phase of its life. ...
Parameters of massive stars in the Milky Way and nearby galaxies
... results in no apparent difference between Galactic (from McErlean et al. 1999, Crowther et al. 2005), LMC (Evans et al. 2004) and SMC analyses (Trundle et al. 2004, 2005), although the new results for Galactic B supergiants by Crowther et al. (2005) indicate for them lower temperatures than the olde ...
... results in no apparent difference between Galactic (from McErlean et al. 1999, Crowther et al. 2005), LMC (Evans et al. 2004) and SMC analyses (Trundle et al. 2004, 2005), although the new results for Galactic B supergiants by Crowther et al. (2005) indicate for them lower temperatures than the olde ...
File
... young Sun. Where did the gas that made up the solar nebula come from? According to modern science, it was the product of billions of years of galactic recycling that occurred before the Sun and planets were born. Recall that the universe as a whole is thought to have been born in the Big Bang, which ...
... young Sun. Where did the gas that made up the solar nebula come from? According to modern science, it was the product of billions of years of galactic recycling that occurred before the Sun and planets were born. Recall that the universe as a whole is thought to have been born in the Big Bang, which ...
Potential biosignatures in super
... this approach so that habitable surface temperatures were not enforced and allowed the temperature to adjust in a consistent way to the different spectral energy distribution of the M-dwarf stars. Thus, we separated in our investigation the effects of the different spectral energy distributions from va ...
... this approach so that habitable surface temperatures were not enforced and allowed the temperature to adjust in a consistent way to the different spectral energy distribution of the M-dwarf stars. Thus, we separated in our investigation the effects of the different spectral energy distributions from va ...
Constraining Star-Formation History in SN Ia Host Galaxies Using
... galaxies and find that ~ 30% of them are actively star-forming Further analysis is needed to investigate sources of error and estimate uncertainties on stellar masses and SFRs Even with just 4 fit parameters, degeneracies in the models exist and can affect best-fit determinations and derived par ...
... galaxies and find that ~ 30% of them are actively star-forming Further analysis is needed to investigate sources of error and estimate uncertainties on stellar masses and SFRs Even with just 4 fit parameters, degeneracies in the models exist and can affect best-fit determinations and derived par ...
Thermal emission and internal heating processes in millisecond
... • Observed UV emission of PSR J0437-4715 may be due to rotochemical heating • The same emission can be used to constrain |dG/dt|: – competitive with best existing constraints if fast cooling processes could be ruled out ...
... • Observed UV emission of PSR J0437-4715 may be due to rotochemical heating • The same emission can be used to constrain |dG/dt|: – competitive with best existing constraints if fast cooling processes could be ruled out ...
2015 SAO Summer Intern AAS Abstracts - Harvard
... (1 Howard University, 2 Harvard-Smithsonian Center for Astrophysics,3 Sagan Fellow) Transit light curves contain a wealth of information about the basic properties of a planet, such as its radius, semi-major axis, and orbital period. For the latter property, there is a distinct lack of planets with ...
... (1 Howard University, 2 Harvard-Smithsonian Center for Astrophysics,3 Sagan Fellow) Transit light curves contain a wealth of information about the basic properties of a planet, such as its radius, semi-major axis, and orbital period. For the latter property, there is a distinct lack of planets with ...
Gamma Ray Bursts: The biggest bang since the big one!
... across interstellar space • Contains all heavy elements needed for life (C, N, O, Fe etc) • Where slams into molecular gas then triggers next generation of stars/planets(/life?) ...
... across interstellar space • Contains all heavy elements needed for life (C, N, O, Fe etc) • Where slams into molecular gas then triggers next generation of stars/planets(/life?) ...
Kathy Geise `08 - DU Portfolio
... temperature, the surface gravitational acceleration and average mean molecular weight of the gas. The model steps through the atmosphere from the surface to the bottom using differential steps in optical depth, dτ. All other parameters are defined by the optical depth. The model also uses different ...
... temperature, the surface gravitational acceleration and average mean molecular weight of the gas. The model steps through the atmosphere from the surface to the bottom using differential steps in optical depth, dτ. All other parameters are defined by the optical depth. The model also uses different ...
end-of-summer report
... activity in stars differs depending on which energy band is observed. Thus far, stellar UV emission has proven to be the most convenient medium for detecting magnetic flux variability over long time scales. Simply put, ground based telescopes can easily detect the UV band from stars and this allows ...
... activity in stars differs depending on which energy band is observed. Thus far, stellar UV emission has proven to be the most convenient medium for detecting magnetic flux variability over long time scales. Simply put, ground based telescopes can easily detect the UV band from stars and this allows ...
Lecture 6: Continuum Opacity and Stellar Atmospheres
... Free-Free: The main free-free emission source is also from HI. This means transitions within the continuum levels of the HI atom. (In effect, these are ionized atoms that have electrons temporarily in their vicinity but not bound to them. A photon passing by can interact with this proton plus electr ...
... Free-Free: The main free-free emission source is also from HI. This means transitions within the continuum levels of the HI atom. (In effect, these are ionized atoms that have electrons temporarily in their vicinity but not bound to them. A photon passing by can interact with this proton plus electr ...
Oxygen isotopes in circumstellar Al_2O_3 grains from meteorites
... orders of magnitude below those where grain formation is considered possible. However, shortly before becoming carbon stars, low-mass AGB stars may become Mira variables, which have observed mass loss rates of up to 10- 6 M 0 yr- 1 and infrared excesses indicating grain formation (Willems & de Jong ...
... orders of magnitude below those where grain formation is considered possible. However, shortly before becoming carbon stars, low-mass AGB stars may become Mira variables, which have observed mass loss rates of up to 10- 6 M 0 yr- 1 and infrared excesses indicating grain formation (Willems & de Jong ...
Kepler`s Laws of Planetary Motion
... center of mass of the galaxy to be moving more slowly, but this is not the case. One explanation for this is that there is more mass present, dark mass we cannot detect, spread throughout the galaxy and not concentrated just near the center. According to Einstein, massive objects can bend light. Thi ...
... center of mass of the galaxy to be moving more slowly, but this is not the case. One explanation for this is that there is more mass present, dark mass we cannot detect, spread throughout the galaxy and not concentrated just near the center. According to Einstein, massive objects can bend light. Thi ...
CENTRAL MICHIGAN UNIVERSITY
... Special Requirements of the Course Nighttime use of the astronomical observatory is required. ...
... Special Requirements of the Course Nighttime use of the astronomical observatory is required. ...
Chapter 1.3 Motion of the Sun and the Stars
... that there was a practical benefit in being able to predict the positions of the stars, but its roots go much deeper than that. The need to understand where we came from, and how we fit into the cosmos, is an integral part of human nature. 2.2 The Geocentric Universe The Greeks of antiquity, and und ...
... that there was a practical benefit in being able to predict the positions of the stars, but its roots go much deeper than that. The need to understand where we came from, and how we fit into the cosmos, is an integral part of human nature. 2.2 The Geocentric Universe The Greeks of antiquity, and und ...
L21 THE NONSPHERICAL SHAPE OF BETELGEUSE IN THE
... as a source of opacity (Ohnaka 2004; Tsuji 2006), but it is difficult for current models to generate lines broad enough to agree with no significant structure being seen in the spectra at ISI wavelengths (Weiner et al. 2003; Verhoelst et al. 2006). Furthermore, temperatures are high enough near the ...
... as a source of opacity (Ohnaka 2004; Tsuji 2006), but it is difficult for current models to generate lines broad enough to agree with no significant structure being seen in the spectra at ISI wavelengths (Weiner et al. 2003; Verhoelst et al. 2006). Furthermore, temperatures are high enough near the ...