Observational properties of stars
... observed throughout history – though they were not recognized as such. Usually they are considered short term events, referred to by ancient Chinese astronomers as “guest stars”. There are a few very famous observed SNe over the centuries: SN1006 – (April 30) in Lupus (below Orion), observed by Arab ...
... observed throughout history – though they were not recognized as such. Usually they are considered short term events, referred to by ancient Chinese astronomers as “guest stars”. There are a few very famous observed SNe over the centuries: SN1006 – (April 30) in Lupus (below Orion), observed by Arab ...
An-Introduction-to-Spectrometric
... dimensions significantly smaller than the wavelength of the radiation is called Rayleigh scattering; its intensity is proportional to the inverse fourth-power of the wavelength, the dimensions of the scattering particles, and the square of the polarizability of the particles. An everyday manifestati ...
... dimensions significantly smaller than the wavelength of the radiation is called Rayleigh scattering; its intensity is proportional to the inverse fourth-power of the wavelength, the dimensions of the scattering particles, and the square of the polarizability of the particles. An everyday manifestati ...
wilner_alma06
... ALMA and Dust Emission • “vibrational” emission is dominant mechanism (thermal fluctuations in charge distribution) • longest observable ’s: 0.35 to >3 mm • sensitive to cold dust: T<10’s of K • samples all disk radii/depths • if low opacity, then flux ~ Mdust weighted by Tdust • wavelength depend ...
... ALMA and Dust Emission • “vibrational” emission is dominant mechanism (thermal fluctuations in charge distribution) • longest observable ’s: 0.35 to >3 mm • sensitive to cold dust: T<10’s of K • samples all disk radii/depths • if low opacity, then flux ~ Mdust weighted by Tdust • wavelength depend ...
7.8 Polarized light - one more excursion into optics 7.8.1 The
... We first discuss the production of circularly polarised light from a linearly polarised laser beam. The standard tool is a λ/4 plate. This is a plane parallel birefringent crystal plate (usually of quartz or magnesium fluoride), i. e. , it has two different indices of refraction n f and n s > n f fo ...
... We first discuss the production of circularly polarised light from a linearly polarised laser beam. The standard tool is a λ/4 plate. This is a plane parallel birefringent crystal plate (usually of quartz or magnesium fluoride), i. e. , it has two different indices of refraction n f and n s > n f fo ...
Lecture notes
... Schönberg and Chandrasekhar determined the constant to be 0.37, and if the envelope has a solar composition and the core consists of helium we have that µenv = 0.6 and µc = 1, which gives us Mc /M ≤ 0.13. As the core mass exceeds this value the core contracts rapidly. For stars larger than 2M the ...
... Schönberg and Chandrasekhar determined the constant to be 0.37, and if the envelope has a solar composition and the core consists of helium we have that µenv = 0.6 and µc = 1, which gives us Mc /M ≤ 0.13. As the core mass exceeds this value the core contracts rapidly. For stars larger than 2M the ...
Communicating Research to the General Public
... wavelengths matches the separation between energy levels in the ozone molecules (we would say that the light is resonant with the transition) and the probability of the molecule absorbing the right-colored light that happens to hit it is high (we would say that the transition dipole moment is large) ...
... wavelengths matches the separation between energy levels in the ozone molecules (we would say that the light is resonant with the transition) and the probability of the molecule absorbing the right-colored light that happens to hit it is high (we would say that the transition dipole moment is large) ...
Large distance of epsilon Aurigae from interstellar
... perplexed astronomers for over a century. The eclipse arises from the transit of a huge, cool and opaque, disk across the face of the F0 Iab star. One of the principal problems with understanding this binary is that the very small parallax of p = (1.53 ± 1.29) mas, implying a distance range of d ∼ ( ...
... perplexed astronomers for over a century. The eclipse arises from the transit of a huge, cool and opaque, disk across the face of the F0 Iab star. One of the principal problems with understanding this binary is that the very small parallax of p = (1.53 ± 1.29) mas, implying a distance range of d ∼ ( ...
LouysLSBGalaxiesDete..
... to increasing scales of the image. •We want to compute the a posteriori probability of having site s in one class c, knowing the observation Ys and the class number of the parent node within the Markov tree. •The Quadtree provides an in-scale regularisation framework, providing exact and non iterati ...
... to increasing scales of the image. •We want to compute the a posteriori probability of having site s in one class c, knowing the observation Ys and the class number of the parent node within the Markov tree. •The Quadtree provides an in-scale regularisation framework, providing exact and non iterati ...
Slide 1
... should dominate over N2 and CH4 over CO, but it is possible that interstellar N2 and CO never transformed into NH3 and CH4. • At distances from the Sun > approx. 3-5 AU (beyond the “snow line”) icy planetesimals may exist and facilitate the formation of gas planets. • Hydrated minerals like talk or ...
... should dominate over N2 and CH4 over CO, but it is possible that interstellar N2 and CO never transformed into NH3 and CH4. • At distances from the Sun > approx. 3-5 AU (beyond the “snow line”) icy planetesimals may exist and facilitate the formation of gas planets. • Hydrated minerals like talk or ...
A. Menegolli
... Teflon also presents both reflective and diffusive behavior, but the diffusion now dominates; it is present a strong asymmetry going from -45° to +45°, maybe due to the shadow from the support of the sample; the two contributions could not properly have been disentangled, so that it was possible jus ...
... Teflon also presents both reflective and diffusive behavior, but the diffusion now dominates; it is present a strong asymmetry going from -45° to +45°, maybe due to the shadow from the support of the sample; the two contributions could not properly have been disentangled, so that it was possible jus ...
Jeans Length
... N molecules of mass m in box of size L at temp T. • Gravitational Energy: EG ~ G M M L ...
... N molecules of mass m in box of size L at temp T. • Gravitational Energy: EG ~ G M M L ...
Blackholes - Indiana University Astronomy
... Compact objects in binary systems with masses greater than about 3 solar masses can’t be neutron stars They must be black holes ...
... Compact objects in binary systems with masses greater than about 3 solar masses can’t be neutron stars They must be black holes ...
2 Big Bang - Net Texts
... Except as otherwise noted, all CK-12 Content (including CK-12 Curriculum Material) is made available to Users in accordance with the Creative Commons Attribution/NonCommercial/Share Alike 3.0 Unported (CC BY-NC-SA) License (http://creativecommons.org/licenses/by-nc-sa/3.0/), as amended and updated b ...
... Except as otherwise noted, all CK-12 Content (including CK-12 Curriculum Material) is made available to Users in accordance with the Creative Commons Attribution/NonCommercial/Share Alike 3.0 Unported (CC BY-NC-SA) License (http://creativecommons.org/licenses/by-nc-sa/3.0/), as amended and updated b ...
1. What is the HR diagram? 1a. The HR diagram is a plot of a star`s
... The explosive start to Helium burning in the core for low mass stars. On the horizontal branch, how is the star powered? What burns where? Helium burning in the core. No real shell burning at this stage. On the asymptotic giant branch (AGB), can you ever get a helium burning shell outside a hydrogen ...
... The explosive start to Helium burning in the core for low mass stars. On the horizontal branch, how is the star powered? What burns where? Helium burning in the core. No real shell burning at this stage. On the asymptotic giant branch (AGB), can you ever get a helium burning shell outside a hydrogen ...
Sample pages 1 PDF
... One of my fellow faculty members has a Ganesha deity on his table, which he had collected from India during a trip several years ago. Ganesha sits there displaying a deep sense of tranquility close to a computer in all his majesty and mystery in an American office setting. Another of my colleagues, ...
... One of my fellow faculty members has a Ganesha deity on his table, which he had collected from India during a trip several years ago. Ganesha sits there displaying a deep sense of tranquility close to a computer in all his majesty and mystery in an American office setting. Another of my colleagues, ...
The difficulty of forming large disk galaxies with small bulges
... Cosmological hydro simulations provide a guide: simulations (Fernandez et al 2012) of a MW-sized galaxy shows that the amount of HI present in the halo since z = 0.3 is roughly constant, at about 108 M. The HI accretion rate on to the disk is about 0.2 M yr-1. The satellites are losing gas (about ...
... Cosmological hydro simulations provide a guide: simulations (Fernandez et al 2012) of a MW-sized galaxy shows that the amount of HI present in the halo since z = 0.3 is roughly constant, at about 108 M. The HI accretion rate on to the disk is about 0.2 M yr-1. The satellites are losing gas (about ...
Foreign molecules and ions in beryl obtained by infrared and visible
... data about main characteristics there is a limited amount of information about foreign molecules in the mineral structure. Two beryl samples from different locations in Serbia were examined in detail but infrared spectroscopy (IR) and spectrophotometry (VIS) was used for determination of foreign mol ...
... data about main characteristics there is a limited amount of information about foreign molecules in the mineral structure. Two beryl samples from different locations in Serbia were examined in detail but infrared spectroscopy (IR) and spectrophotometry (VIS) was used for determination of foreign mol ...
Powerpoint file
... • Can get good statistics on Earth mass planets in the habitable zone of stars • Multiple systems can be detected at the same time ...
... • Can get good statistics on Earth mass planets in the habitable zone of stars • Multiple systems can be detected at the same time ...
Poster - unist
... solve gas and dark matter dynamics in spherical symmetry, consistently incorporating the radiative transfer of UV photons and non-equilibrium chemical reactions regarding hydrogen molecules (H2). In addition, the star formation from cooled gas component is included.We also simulate the evolution of ...
... solve gas and dark matter dynamics in spherical symmetry, consistently incorporating the radiative transfer of UV photons and non-equilibrium chemical reactions regarding hydrogen molecules (H2). In addition, the star formation from cooled gas component is included.We also simulate the evolution of ...
Stefan-Boltzmann Law Problems
... This question is the most involved of th3ese practice problems because you are not given enough information in the question to find the answer directly. The Stefan-Boltzmann Law is a relationship between luminosity, temperature and radius. In this problem we are asked to determine the radii ratio o ...
... This question is the most involved of th3ese practice problems because you are not given enough information in the question to find the answer directly. The Stefan-Boltzmann Law is a relationship between luminosity, temperature and radius. In this problem we are asked to determine the radii ratio o ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.