tutorial1_2014
... The V magnitude of a star is 15.1, B-V = 1.6 and Mv = 1.3. The extinction in the direction of the star (in the visual band) is Av = 1 mag kpc-1. What is the intrinsic colour of the star? Question 8: Determine the foreground and internal extinction towards a galaxy Go to NED, the NASA/IPAC Extragalac ...
... The V magnitude of a star is 15.1, B-V = 1.6 and Mv = 1.3. The extinction in the direction of the star (in the visual band) is Av = 1 mag kpc-1. What is the intrinsic colour of the star? Question 8: Determine the foreground and internal extinction towards a galaxy Go to NED, the NASA/IPAC Extragalac ...
January 2013 - astronomy for beginners
... star itself does not change colour, it is caused by the Sirius ‘A’. turbulence in the atmosphere close to horizon. Stars positioned higher in the sky twinkle less and when directly overhead hardly twinkle at all. Not only is Sirius the brightest star in our night sky it is also the closest star that ...
... star itself does not change colour, it is caused by the Sirius ‘A’. turbulence in the atmosphere close to horizon. Stars positioned higher in the sky twinkle less and when directly overhead hardly twinkle at all. Not only is Sirius the brightest star in our night sky it is also the closest star that ...
Finding Constellations From Orion
... Following the stars of Orion’s Belt backwards (from 3 to 1) points us to Sirius (SEER-e-us), the Dog Star. This is the brightest star in the sky, and is part of the constellation Canis Major, the Great Dog. Drawing a line from Bellatrix (bell-LAY-triks) through Betelgeuse points us to Procyon (PRO- ...
... Following the stars of Orion’s Belt backwards (from 3 to 1) points us to Sirius (SEER-e-us), the Dog Star. This is the brightest star in the sky, and is part of the constellation Canis Major, the Great Dog. Drawing a line from Bellatrix (bell-LAY-triks) through Betelgeuse points us to Procyon (PRO- ...
human eye and colourful world part 2
... scattering. This phenomenon is governed by the Tyndall effect. Tyndall effect :The Tyndall effect is caused by the scattering of light by very small air particles, which are suspended in the Earth’s atmosphere. To observe the Tyndall effect, the particles diameter should be less than th of the wavel ...
... scattering. This phenomenon is governed by the Tyndall effect. Tyndall effect :The Tyndall effect is caused by the scattering of light by very small air particles, which are suspended in the Earth’s atmosphere. To observe the Tyndall effect, the particles diameter should be less than th of the wavel ...
N 2
... inversion we have the ability to amplify a signal via stimulated emission, the overall single-pass gain is quite small, and most of the excited atoms in the population emit spontaneously and do not contribute to the overall ...
... inversion we have the ability to amplify a signal via stimulated emission, the overall single-pass gain is quite small, and most of the excited atoms in the population emit spontaneously and do not contribute to the overall ...
Chapter 20-Light The Nature of Light Visible Light Is a Form of
... d. Moon and planets do not produce their own light e. Bioluminescence= biochemical process where organisms can produce their own light f. Artificial sources of light include candle, kerosene lamp, gasoline lamp, electric light, fluorescent light, neon light, sulfur lamp, laser light g. Sulfur lamp= ...
... d. Moon and planets do not produce their own light e. Bioluminescence= biochemical process where organisms can produce their own light f. Artificial sources of light include candle, kerosene lamp, gasoline lamp, electric light, fluorescent light, neon light, sulfur lamp, laser light g. Sulfur lamp= ...
Fix
... What makes the North Star, Polaris, special? A. It is the brightest star in the sky. B. It is the star straight overhead. C. It is currently very near the north celestial pole. D. It is the star directly on your northern horizon. E. It can be used to determine your longitude on Earth. ...
... What makes the North Star, Polaris, special? A. It is the brightest star in the sky. B. It is the star straight overhead. C. It is currently very near the north celestial pole. D. It is the star directly on your northern horizon. E. It can be used to determine your longitude on Earth. ...
Optics - Mr. Gallagher's Physics
... • The incident ray is the light ray that strikes the mirror. • The reflected ray is the light ray that bounces off the mirror • Between the incident and reflected rays, there is an imaginary line called the normal line which is perpendicular to the surface of the mirror. • The angle between the inci ...
... • The incident ray is the light ray that strikes the mirror. • The reflected ray is the light ray that bounces off the mirror • Between the incident and reflected rays, there is an imaginary line called the normal line which is perpendicular to the surface of the mirror. • The angle between the inci ...
The photoelectric effect - University of Toronto Physics
... The experiment that shattered the fundaments of classical physics was carried out by J.J. Thomson in 1899: he discovered that ultraviolet light discharges a negatively charged metal target. The target actually emits charges which were found to have the same charge/mass ratio as the electrons. The em ...
... The experiment that shattered the fundaments of classical physics was carried out by J.J. Thomson in 1899: he discovered that ultraviolet light discharges a negatively charged metal target. The target actually emits charges which were found to have the same charge/mass ratio as the electrons. The em ...
Goal: To understand how Saturn formed and what its core is
... • Once the material between 2 planets is consumed the outer planet can only eat what is outside of it and will move out. • The inner planet will eat the material inside of it as it moves in. ...
... • Once the material between 2 planets is consumed the outer planet can only eat what is outside of it and will move out. • The inner planet will eat the material inside of it as it moves in. ...
Rotation ,vibration, electronic spectra
... emit, and scatter electromagnetic radiation. • From the equipartition theorem, the N2 molecule may be thought of as two N atoms held together with a massless, rigid rod (rigid rotator model). • In a purely rotational system, the kinetic energy is expressed in terms of the angular momentum L and rota ...
... emit, and scatter electromagnetic radiation. • From the equipartition theorem, the N2 molecule may be thought of as two N atoms held together with a massless, rigid rod (rigid rotator model). • In a purely rotational system, the kinetic energy is expressed in terms of the angular momentum L and rota ...
The evolution of galaxy groups
... groups have few members. • Things to find out: – What is efficiency of galaxy formation in groups? Need stellar mass, gas mass, dynamical mass – What is star formation rate? [OII], Ha, UV ...
... groups have few members. • Things to find out: – What is efficiency of galaxy formation in groups? Need stellar mass, gas mass, dynamical mass – What is star formation rate? [OII], Ha, UV ...
NGC 3801 caught in the act: A post-merger starforming early
... more similar to the hysteresis loop. The radio lobes, also in the shape of S, is seen confined within this hysteresis loop structure (HLS), with similar clockwise bending (See Fig.1; Heckman et al. 1986). Surrounding these radio lobes, shock shells have been discovered with the Chandra X-ray observa ...
... more similar to the hysteresis loop. The radio lobes, also in the shape of S, is seen confined within this hysteresis loop structure (HLS), with similar clockwise bending (See Fig.1; Heckman et al. 1986). Surrounding these radio lobes, shock shells have been discovered with the Chandra X-ray observa ...
Stability of hot neutron stars
... presence of the Urca shell the energy losses owing to neutrino emission and the entropy increase resulting from non-equilibrium beta reactions are much smaller than the rate of decrease of the energy of pulsations by the excitation of shortwavelength acoustic waves. The dissipation of the vibrationa ...
... presence of the Urca shell the energy losses owing to neutrino emission and the entropy increase resulting from non-equilibrium beta reactions are much smaller than the rate of decrease of the energy of pulsations by the excitation of shortwavelength acoustic waves. The dissipation of the vibrationa ...
White dwarfs - University of Toronto
... A Type Ia supernova more than twice as bright as others of its type has been observed, suggesting it arose from a star that managed to grow more massive than the Chandrasekhar limit. This mass cut-off was thought to make all such supernovae explode with about the same intrinsic brightness, allowing ...
... A Type Ia supernova more than twice as bright as others of its type has been observed, suggesting it arose from a star that managed to grow more massive than the Chandrasekhar limit. This mass cut-off was thought to make all such supernovae explode with about the same intrinsic brightness, allowing ...
Commentary & discussion of nonparametric inference
... I suggest that the study of elliptical galaxy structure was confused by the belief that any interpretation of data must be based on a parametric model, however heuristic or implausible. ...
... I suggest that the study of elliptical galaxy structure was confused by the belief that any interpretation of data must be based on a parametric model, however heuristic or implausible. ...
Stellar evolution
... • The supernova can last weeks or months, and release as much energy as the sun does in its entire lifespan. • The supernova is a main source of heavy elements in the universe. • The remaining core will collapse into either a neutron star or a black hole. ...
... • The supernova can last weeks or months, and release as much energy as the sun does in its entire lifespan. • The supernova is a main source of heavy elements in the universe. • The remaining core will collapse into either a neutron star or a black hole. ...
Slide 1
... • Nothing is left behind, except whatever elements were left over from the white dwarf or forged in the supernova blast • Among the new elements is radioactive nickel, which liberates huge amounts of energy, including visible light ...
... • Nothing is left behind, except whatever elements were left over from the white dwarf or forged in the supernova blast • Among the new elements is radioactive nickel, which liberates huge amounts of energy, including visible light ...
Last time: looked at proton-proton chain to convert Hydrogen into
... Young stars which are still accreting material are called T-Tauri Stars. Because mass is piling on, they sometimes have explosive outbursts. ...
... Young stars which are still accreting material are called T-Tauri Stars. Because mass is piling on, they sometimes have explosive outbursts. ...
Search for Life in the Universe
... – Nulling: directly measure a difference instead of subtracting full observations after the fact – Interferometers: utilize the physical interference of light waves – Terrestrial Planet Finder (TPF, schedule??) and/or Darwin (schedule ??): Search for Earth-size planets around ~150 nearby stars ...
... – Nulling: directly measure a difference instead of subtracting full observations after the fact – Interferometers: utilize the physical interference of light waves – Terrestrial Planet Finder (TPF, schedule??) and/or Darwin (schedule ??): Search for Earth-size planets around ~150 nearby stars ...
answer key
... The Universe: Life & Death of a Star Key Forces of Gravity 1. How many stars are in our galaxy? ...
... The Universe: Life & Death of a Star Key Forces of Gravity 1. How many stars are in our galaxy? ...
First detection of helium emissions in RR Lyrae⋆
... Just after the first apparition of the Hα emission shoulder (at ϕ = 0.887), a sudden onset of the He I λ5875.66 (D3) emission appears at ϕ = 0.902. It is weakly blueshifted (−6 km s−1 ), while the Hα emission component is more blueshifted (−43 km s−1 ). Figures 3 and 4 present the variation in the H ...
... Just after the first apparition of the Hα emission shoulder (at ϕ = 0.887), a sudden onset of the He I λ5875.66 (D3) emission appears at ϕ = 0.902. It is weakly blueshifted (−6 km s−1 ), while the Hα emission component is more blueshifted (−43 km s−1 ). Figures 3 and 4 present the variation in the H ...
γ The Potential for Intensity Interferometry with –
... Photospheric absorption lines show Be stars are close to break-up rotational velocities. Also, Balmer line emission show gaseous circumstellar discs that appear and disappear on timescales of months to years. These two properties are somehow related, but have many open questions about the detailed p ...
... Photospheric absorption lines show Be stars are close to break-up rotational velocities. Also, Balmer line emission show gaseous circumstellar discs that appear and disappear on timescales of months to years. These two properties are somehow related, but have many open questions about the detailed p ...
Lecture 33 : Chiral molecules and Optical Activity
... Chirality Simply stated, when a molecule or any geometric object and it’s mirror image are not identical (super-imposable) we call these objects chiral. Examples are: right handed or left handed helices, carbon atom covalently bonded to 4 different substituients. Most important biological molecules ...
... Chirality Simply stated, when a molecule or any geometric object and it’s mirror image are not identical (super-imposable) we call these objects chiral. Examples are: right handed or left handed helices, carbon atom covalently bonded to 4 different substituients. Most important biological molecules ...
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.