Part 1- The Basics
... temperature) to bottom-right (low luminosity and low surface temperature) – 90% stars in this band – The Sun is one of main sequence stars – Hydrogen burning as energy source ...
... temperature) to bottom-right (low luminosity and low surface temperature) – 90% stars in this band – The Sun is one of main sequence stars – Hydrogen burning as energy source ...
14.5 Yellow Giants and Pulsating Stars Variable Stars Not all stars
... variables) that have pulsation periods of about 1 year. These lie in the upper right of the HR diagram. The Sun will probably become a Mira variable near the end of its lifetime, as we will discuss in the section 14.6. The Period–Luminosity Relation Many pulsating variable stars obey a law that rel ...
... variables) that have pulsation periods of about 1 year. These lie in the upper right of the HR diagram. The Sun will probably become a Mira variable near the end of its lifetime, as we will discuss in the section 14.6. The Period–Luminosity Relation Many pulsating variable stars obey a law that rel ...
Aug 2015 supplement - Hermanus Astronomy
... Big Bang, the universe was full of a fog of hydrogen gas. But as more and more brilliant sources - both stars and quasars powered by huge black holes started to shine, they cleared away the mist and made the universe transparent to ultraviolet light. Astronomers call this the epoch of reionisation, ...
... Big Bang, the universe was full of a fog of hydrogen gas. But as more and more brilliant sources - both stars and quasars powered by huge black holes started to shine, they cleared away the mist and made the universe transparent to ultraviolet light. Astronomers call this the epoch of reionisation, ...
Black Hole
... Black Hole - a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. ...
... Black Hole - a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. ...
Stars
... Sun will become a white dwarf. • More massive stars are able to achieve temperatures hot enough to synthesize heavier elements. • The Sun’s magnetic field reverses every 11 years, producing a periodicity to the sun spots and solar activity. ...
... Sun will become a white dwarf. • More massive stars are able to achieve temperatures hot enough to synthesize heavier elements. • The Sun’s magnetic field reverses every 11 years, producing a periodicity to the sun spots and solar activity. ...
METRIC PREFIXES
... 1. One light-year in the distance light travels in one year. This distance is equal to 9.461 x 1015m. After the sun, the star nearest to Earth is Alpha Centauri, which is about 4.35 light- years from Earth. Express this distance in a. megameters ...
... 1. One light-year in the distance light travels in one year. This distance is equal to 9.461 x 1015m. After the sun, the star nearest to Earth is Alpha Centauri, which is about 4.35 light- years from Earth. Express this distance in a. megameters ...
Summary: Nuclear burning in stars
... • Spiral arms have higher density than space between arms • Excess gravitational attraction slows down gas, stars when they pass through spiral arm in course of their orbits. • Î spiral arms are a traffic jam ...
... • Spiral arms have higher density than space between arms • Excess gravitational attraction slows down gas, stars when they pass through spiral arm in course of their orbits. • Î spiral arms are a traffic jam ...
LAB: Star Classification
... KPD 0005+5106. The team who present these observations show that this white dwarf is among the hottest stars known so far, with a temperature of 200,000º K at its surface. Stars of intermediate mass (1-8 solar masses) terminate their life as an Earth-sized white dwarf after the exhaustion of their n ...
... KPD 0005+5106. The team who present these observations show that this white dwarf is among the hottest stars known so far, with a temperature of 200,000º K at its surface. Stars of intermediate mass (1-8 solar masses) terminate their life as an Earth-sized white dwarf after the exhaustion of their n ...
Unit 8 Chapter 30 Stars, Galaxies and the Universe
... These ripples are irregularities in the cosmic background radiation, which were caused by small fluctuations in the distribution of matter in the early universe. The ripples are thought to indicate the first stages in the formation of the universe's first galaxies. ...
... These ripples are irregularities in the cosmic background radiation, which were caused by small fluctuations in the distribution of matter in the early universe. The ripples are thought to indicate the first stages in the formation of the universe's first galaxies. ...
AN INTRODUCTION TO ASTRONOMY Dr. Uri Griv Department of Physics, Ben-Gurion University
... Solar System. And while Saturn has the brightest rings, this system of rings and moons actually belongs to planet Uranus, imaged here in near-infrared light by the Antu telescope at the ESO Paranal Observatory in Chile. Since gas giant Uranus’ methane-laced atmosphere absorbs sunlight at near-infrar ...
... Solar System. And while Saturn has the brightest rings, this system of rings and moons actually belongs to planet Uranus, imaged here in near-infrared light by the Antu telescope at the ESO Paranal Observatory in Chile. Since gas giant Uranus’ methane-laced atmosphere absorbs sunlight at near-infrar ...
hotstar_xrays
... models (left) and wind-shock models (right). Line profiles as a function of the scaled wind velocity (x=cDl/lov) are shown for different instrumental resolutions in each sub-panel. The panels have wind attenuation increasing downward. Note that as the wind attenuation increases less and less of the ...
... models (left) and wind-shock models (right). Line profiles as a function of the scaled wind velocity (x=cDl/lov) are shown for different instrumental resolutions in each sub-panel. The panels have wind attenuation increasing downward. Note that as the wind attenuation increases less and less of the ...
Stellar Evolution
... carbon core. • How they get from main sequence to the carbon core stage is a little different. • Now however, there is enough mass that it becomes hot enough to fuse carbon? • Hot enough to eventually fuse lots of elements. ...
... carbon core. • How they get from main sequence to the carbon core stage is a little different. • Now however, there is enough mass that it becomes hot enough to fuse carbon? • Hot enough to eventually fuse lots of elements. ...
Lecture 11, PPT version
... your line of sight, there is no Doppler shift and you see the “zero velocity” line pattern. The curved magenta line above shows you how one particular black absorption line sweeps up and down the spectrum due to orbital motion. ...
... your line of sight, there is no Doppler shift and you see the “zero velocity” line pattern. The curved magenta line above shows you how one particular black absorption line sweeps up and down the spectrum due to orbital motion. ...
Milky Way - Wayne Hu`s Tutorials
... • Dust (silicates, graphite, hydrocarbons) in ISM (Chap 12) dims stars at visible wavelengths making true distance less than apparent • Distance formula modified to be d = 10(mλ −Mλ −Aλ )/5 10pc where the extinction coefficient Aλ ≥ 0 depends on wavelength λ • Extinction also depends on direction, e ...
... • Dust (silicates, graphite, hydrocarbons) in ISM (Chap 12) dims stars at visible wavelengths making true distance less than apparent • Distance formula modified to be d = 10(mλ −Mλ −Aλ )/5 10pc where the extinction coefficient Aλ ≥ 0 depends on wavelength λ • Extinction also depends on direction, e ...
Molecular gas in z~6 quasar host galaxies
... • Molecular CO has been detected in a sample of eight mm bright quasars at z~6. • The CO detections suggest the presence of highly excited molecular gas in the quasar host galaxies, with molecular gas masses on order of 1010 Msun. The gas mass and line width distributions are similar to that of the ...
... • Molecular CO has been detected in a sample of eight mm bright quasars at z~6. • The CO detections suggest the presence of highly excited molecular gas in the quasar host galaxies, with molecular gas masses on order of 1010 Msun. The gas mass and line width distributions are similar to that of the ...
Today`s Powerpoint
... equally bright but we knew that star A was 10 times further away, what do we know about the luminosity of star A? A: The two stars have equal luminosity. ...
... equally bright but we knew that star A was 10 times further away, what do we know about the luminosity of star A? A: The two stars have equal luminosity. ...
THERMAL STABILITY OF LOW MASS STARS
... The sequence of stars in thermal equilibrium may be extended beyond the point defined with equation (ts.30). However, while the stellar radius may still decrease, the stellar mass will increase. Therefore, for masses somewhat above the minimum mass there are two different equilibrium models: one on ...
... The sequence of stars in thermal equilibrium may be extended beyond the point defined with equation (ts.30). However, while the stellar radius may still decrease, the stellar mass will increase. Therefore, for masses somewhat above the minimum mass there are two different equilibrium models: one on ...
Take time to understand it now
... • Come to a consensus answer you both agree on. • If you get stuck or are not sure of your answer, ask ...
... • Come to a consensus answer you both agree on. • If you get stuck or are not sure of your answer, ask ...
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.