Lecture 5
... The Greek philosophers Anaxagoras (ca. 500–428 BC) and Democritus (450– 370 B.C.) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. Aristotle (384-322 B.C.), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of s ...
... The Greek philosophers Anaxagoras (ca. 500–428 BC) and Democritus (450– 370 B.C.) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. Aristotle (384-322 B.C.), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of s ...
How Bright is that star?
... Relates luminosity, temperature and Radius of a star. The luminosity/meter² (l), is determined by the temperature (T) of that area ) l = σT⁴ (σ is a constant which if T is in °K, “l “ comes out in Watts) Surface area is determined by radius(R): A = 4πR² So the total Luminosity of star becomes L = 4π ...
... Relates luminosity, temperature and Radius of a star. The luminosity/meter² (l), is determined by the temperature (T) of that area ) l = σT⁴ (σ is a constant which if T is in °K, “l “ comes out in Watts) Surface area is determined by radius(R): A = 4πR² So the total Luminosity of star becomes L = 4π ...
Where Do Chemical Elements Come From?
... individual nucleons and the total mass of the resulting nucleus. This energy would be required to disrupt the nucleus of an atom. Thus, nuclei like iron’s and those of heavier elements require large amounts of energy, far beyond the energy available in a normal star. However, as the article states, ...
... individual nucleons and the total mass of the resulting nucleus. This energy would be required to disrupt the nucleus of an atom. Thus, nuclei like iron’s and those of heavier elements require large amounts of energy, far beyond the energy available in a normal star. However, as the article states, ...
Slide 1
... The Greek philosophers Anaxagoras (ca. 500–428 BC) and Democritus (450– 370 B.C.) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. Aristotle (384-322 B.C.), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of s ...
... The Greek philosophers Anaxagoras (ca. 500–428 BC) and Democritus (450– 370 B.C.) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. Aristotle (384-322 B.C.), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of s ...
Understanding Stars
... In this exercise, your group will calculate the temperature, luminosity, and radius of a number of stars, and add these values to the temperature-luminosity diagram on the board. The accompanying handout gives recipes for calculating, in physical units, the properties of any star based only on its s ...
... In this exercise, your group will calculate the temperature, luminosity, and radius of a number of stars, and add these values to the temperature-luminosity diagram on the board. The accompanying handout gives recipes for calculating, in physical units, the properties of any star based only on its s ...
Details of the measurement technique
... Most every large galaxy with a nucleus and a bulge has, at its center, a supermassive black hole. When the black hole is actively accreting matter, it releases a tremendous amount of energy, and the galaxy is said to have an active nucleus. Buffered by the dust in the accretion flow, molecules can s ...
... Most every large galaxy with a nucleus and a bulge has, at its center, a supermassive black hole. When the black hole is actively accreting matter, it releases a tremendous amount of energy, and the galaxy is said to have an active nucleus. Buffered by the dust in the accretion flow, molecules can s ...
Observational Evidence for Dark Matter Simona Murgia, SLAC-KIPAC XXXIX SLAC Summer Institute
... (Much longer timescales for heavier elements to form, e.g. C, N, O) Constrains baryon density: ΩB~ few % ρ ...
... (Much longer timescales for heavier elements to form, e.g. C, N, O) Constrains baryon density: ΩB~ few % ρ ...
Steven R. Majewski - UCLA Physics & Astronomy
... structure and dynamics on galactic to largest scales. • Great success in matching observations on largest scales. • But numerous problems matching data on galaxy scales, e.g.: – “missing satellites problem”/mass spectrum of subhalos – “central cusps problem” – “angular momentum problems” Abadi et al ...
... structure and dynamics on galactic to largest scales. • Great success in matching observations on largest scales. • But numerous problems matching data on galaxy scales, e.g.: – “missing satellites problem”/mass spectrum of subhalos – “central cusps problem” – “angular momentum problems” Abadi et al ...
Topic 3: The Spectroscope - Danielle`s science9 weebly
... The significance of the spectral lines was discovered about 50 years later when Kirschoff and Bunsen, two chemists used a spectroscope to observe various chemicals when they were heated. They found some of the lines missing in some of the chemicals. Each particular element had its own unique spectra ...
... The significance of the spectral lines was discovered about 50 years later when Kirschoff and Bunsen, two chemists used a spectroscope to observe various chemicals when they were heated. They found some of the lines missing in some of the chemicals. Each particular element had its own unique spectra ...
File - Physics with Mr. Mason
... 2. How wide is the Sun (and how does that compare to the Earth)? 3. How far is the Sun from the Earth? 4. What is the Sun made from? 5. What is the corona? 6. What are Sun spots? 7. What are solar flares (coronal mass ejections to be posh)? 8. What type of star is the Sun (e.g. white dwarf, black ho ...
... 2. How wide is the Sun (and how does that compare to the Earth)? 3. How far is the Sun from the Earth? 4. What is the Sun made from? 5. What is the corona? 6. What are Sun spots? 7. What are solar flares (coronal mass ejections to be posh)? 8. What type of star is the Sun (e.g. white dwarf, black ho ...
NASSP Class Test – 2008 April 7th Section A
... (EMCCD), how they are operated and what advantages they have in astronomy. ...
... (EMCCD), how they are operated and what advantages they have in astronomy. ...
VNGS_april2014v2 - McMaster Physics and Astronomy
... • T. Parkin et al., 2014, “The physical characteristics of the gas in the disk of Centaurus A using the Herschel Space Observatory”, ApJ, in press • T. Hughes et al., “A resolved analysis of cold dust and gas in the nearby edge-on spiral NGC 891”, 2014, A&A • M. Schirm et al., “Herschel-SPIRE Fourie ...
... • T. Parkin et al., 2014, “The physical characteristics of the gas in the disk of Centaurus A using the Herschel Space Observatory”, ApJ, in press • T. Hughes et al., “A resolved analysis of cold dust and gas in the nearby edge-on spiral NGC 891”, 2014, A&A • M. Schirm et al., “Herschel-SPIRE Fourie ...
sections 12-15 instructor notes
... the University of Toronto, April 1979) Luminosity Functions. Every astronomer deals almost daily with luminosity functions of some sort. In a way the most basic of such functions is the general luminosity function (GLF), which gives us the distribution function of absolute magnitude, M, for the aver ...
... the University of Toronto, April 1979) Luminosity Functions. Every astronomer deals almost daily with luminosity functions of some sort. In a way the most basic of such functions is the general luminosity function (GLF), which gives us the distribution function of absolute magnitude, M, for the aver ...
Project 8 : Stellar Spectra: Classification
... Objective: The main objective of this project is to learn how to estimate the spectral type of stars from their stellar spectra. At the completion of the project the students should i) understand the process of classifying different spectra by the relative strengths ...
... Objective: The main objective of this project is to learn how to estimate the spectral type of stars from their stellar spectra. At the completion of the project the students should i) understand the process of classifying different spectra by the relative strengths ...
Notes: Stellar Nucleosynthesis
... Fusion of Heavier Elements • Iron is a “star killer” • fusion of iron takes energy (endothermic) instead of giving off energy (exothermic) • therefore, stars begin to “die” once iron is created. ...
... Fusion of Heavier Elements • Iron is a “star killer” • fusion of iron takes energy (endothermic) instead of giving off energy (exothermic) • therefore, stars begin to “die” once iron is created. ...
What is the Zodiac? The Zodiac is defined by 12 constellations
... The 1st decan in the constellation of Virgo is Crux, the Southern Cross. ...
... The 1st decan in the constellation of Virgo is Crux, the Southern Cross. ...
Circumstellar Disks: the Formation and Evolution of
... STIS/CCD coronagraphic images of the b Pic disk. The half-width of the occulted region is 15 AU. At the top is the disk at a logarithmic stretch. At bottom is the disk normalized to the maximum flux, with the vertical scale 16 expanded by a factor of 4 (Heap et al. 2000) ...
... STIS/CCD coronagraphic images of the b Pic disk. The half-width of the occulted region is 15 AU. At the top is the disk at a logarithmic stretch. At bottom is the disk normalized to the maximum flux, with the vertical scale 16 expanded by a factor of 4 (Heap et al. 2000) ...
HW #02 Solutions
... 11. Some stars have temperatures of only 3000 K but have over 100X more luminosity than the Sun. How is this possible? The luminosity of a star depends on two factors; its temperature and its surface area. This is summarized in the Stefan-Boltzmann Law L 4R 2 T 4 . Thus a cool star can have a ...
... 11. Some stars have temperatures of only 3000 K but have over 100X more luminosity than the Sun. How is this possible? The luminosity of a star depends on two factors; its temperature and its surface area. This is summarized in the Stefan-Boltzmann Law L 4R 2 T 4 . Thus a cool star can have a ...
Procedurally Generating an Artificial Galaxy
... We now have a model for creating a two-dimensional galaxy, but we obviously want three dimensions. So we bring in (Z), an integer ranging from -50 to +49. This gives us a three-dimensional grid (X,Y,Z). With one cube at every combination of X, Y and Z, we have 10 000 × 10 000 × 100 = 1010 cubes. The ...
... We now have a model for creating a two-dimensional galaxy, but we obviously want three dimensions. So we bring in (Z), an integer ranging from -50 to +49. This gives us a three-dimensional grid (X,Y,Z). With one cube at every combination of X, Y and Z, we have 10 000 × 10 000 × 100 = 1010 cubes. The ...
Large-eddy simulations of isolated disc galaxies with thermal and
... our simulations, such as an average star formation efficiency ∼1 per cent, a typical velocity dispersion around ∼ 10 km s−1 in star-forming regions, and an almost linear relationship between the column densities of star formation and dense molecular gas. Key words: methods: numerical - galaxies: ISM ...
... our simulations, such as an average star formation efficiency ∼1 per cent, a typical velocity dispersion around ∼ 10 km s−1 in star-forming regions, and an almost linear relationship between the column densities of star formation and dense molecular gas. Key words: methods: numerical - galaxies: ISM ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.