The colour-magnitude diagram
... Around 1910, Ejnar Hertzsprung and Henry Norris Russell plot stars in an `absolute magnitude – spectral type´ diagram They realize that stars do not appear at random but into specific areas: • most stars are located along the main sequence ...
... Around 1910, Ejnar Hertzsprung and Henry Norris Russell plot stars in an `absolute magnitude – spectral type´ diagram They realize that stars do not appear at random but into specific areas: • most stars are located along the main sequence ...
ASTRONOMY 120
... exposed. In the case of a solar-mass star, this core will be made of carbon. The core stabilizes at a radius roughly equal to that of the Earth. This means it has an incredibly high density, a million times the density of the Sun, as it still represents about 10% of the star’s original mass packed i ...
... exposed. In the case of a solar-mass star, this core will be made of carbon. The core stabilizes at a radius roughly equal to that of the Earth. This means it has an incredibly high density, a million times the density of the Sun, as it still represents about 10% of the star’s original mass packed i ...
Stars: flux, luminosity, color, and temperature
... • The brightness of a star is a measure of its flux. • Ptolemy (150 A.D.) grouped stars into 6 `magnitude’ groups according to how bright they looked to his eye. • Herschel (1800s) first measured the brightness of stars quantitatively and matched his measurements onto Ptolemy’s magnitude groups and ...
... • The brightness of a star is a measure of its flux. • Ptolemy (150 A.D.) grouped stars into 6 `magnitude’ groups according to how bright they looked to his eye. • Herschel (1800s) first measured the brightness of stars quantitatively and matched his measurements onto Ptolemy’s magnitude groups and ...
Distance Measurement in Astronomy
... For example the time between the radar pulse being sent out and the reflected pulse being received would be 2.5 s for the Moon and up to 50 minutes for Jupiter and around five and a half hours for Pluto. (The last two numbers depend on the relative positions of the Earth, Jupiter and Pluto in their ...
... For example the time between the radar pulse being sent out and the reflected pulse being received would be 2.5 s for the Moon and up to 50 minutes for Jupiter and around five and a half hours for Pluto. (The last two numbers depend on the relative positions of the Earth, Jupiter and Pluto in their ...
Letot STELLAR EVOLUTION By Kyle Letot Grade Level: 6
... covering of rubber on the balloon is holding the air in. (I will include that stars do NOT have a membrane such as the balloon, rather the balloon has visual similarities that students can see and touch without the harming effects of an actual star.) Next I will point out how the air we used to blow ...
... covering of rubber on the balloon is holding the air in. (I will include that stars do NOT have a membrane such as the balloon, rather the balloon has visual similarities that students can see and touch without the harming effects of an actual star.) Next I will point out how the air we used to blow ...
Binocular Objects (MS Word)
... Sagittarius contains more Messier objects than any other constellation. The best way to identify them is to take them one by one. The beginner will have to be careful not to confuse the various objects. The principal stars of Sagittarius form the famous “Teapot” asterism. The brightest part of the M ...
... Sagittarius contains more Messier objects than any other constellation. The best way to identify them is to take them one by one. The beginner will have to be careful not to confuse the various objects. The principal stars of Sagittarius form the famous “Teapot” asterism. The brightest part of the M ...
Stars and Planets - The University of Texas at Dallas
... Earth-like planets around other stars, but imaging those planets and returning spectra of their atmospheres to look for signatures of life. Terrestrial Planet Finder will also be able to closely observe the planetary formation process in stellar nurseries, as well as targets of more general astrophy ...
... Earth-like planets around other stars, but imaging those planets and returning spectra of their atmospheres to look for signatures of life. Terrestrial Planet Finder will also be able to closely observe the planetary formation process in stellar nurseries, as well as targets of more general astrophy ...
2 Galaxy morphology and classification
... Dwarf ellipticals (dE) - Small galaxies, typically „ 10´3 of the mass of a normal elliptical. having a smooth distribution of stars and little or no gas. Dwarf spheroidal (dSph) - Low-luminosity very di↵use spheroidal systems of stars The Andromeda galaxy (M31) has three dE companions (NGC 147, 185 ...
... Dwarf ellipticals (dE) - Small galaxies, typically „ 10´3 of the mass of a normal elliptical. having a smooth distribution of stars and little or no gas. Dwarf spheroidal (dSph) - Low-luminosity very di↵use spheroidal systems of stars The Andromeda galaxy (M31) has three dE companions (NGC 147, 185 ...
12-1 MAIN-SEQUENCE STARS
... If the collapsing core of a supernova has a mass greater than 3 solar masses, then degenerate neutrons cannot stop the contraction, and it must contract to a very small size—perhaps to a singularity, an object of zero radius. Near such an object, gravity is so strong that not even light can escape, ...
... If the collapsing core of a supernova has a mass greater than 3 solar masses, then degenerate neutrons cannot stop the contraction, and it must contract to a very small size—perhaps to a singularity, an object of zero radius. Near such an object, gravity is so strong that not even light can escape, ...
Nitrogen abundances in solar
... Work focus: non-LTE line formation, quantitative analysis Solar-type stars are valuable tracers of the chemical evolution of the Milky Way over cosmic history because of their longevity. They are numerous, accessible at high spectral resolution out to distances of several kpc with large telescopes, ...
... Work focus: non-LTE line formation, quantitative analysis Solar-type stars are valuable tracers of the chemical evolution of the Milky Way over cosmic history because of their longevity. They are numerous, accessible at high spectral resolution out to distances of several kpc with large telescopes, ...
Part 1: If a 10000 K blackbody has a wavelength of peak emission at
... Here is an example that got ½ credit – again even though it’s not even close to correct: “You determine the age by looking at the stars around it. Since they are in a stellar cluster they are the same age. The age of the star is 2 times the age of the Sun.” ...
... Here is an example that got ½ credit – again even though it’s not even close to correct: “You determine the age by looking at the stars around it. Since they are in a stellar cluster they are the same age. The age of the star is 2 times the age of the Sun.” ...
Introduction to Astronomy
... Absolute Magnitude Absolute Magnitude and Luminosity If the star was at 10 parsecs distance from us, then its apparent magnitude would be equal to its absolute magnitude. The absolute magnitude is a measure of the star's luminosity---the total amount of energy radiated by the star every second. ...
... Absolute Magnitude Absolute Magnitude and Luminosity If the star was at 10 parsecs distance from us, then its apparent magnitude would be equal to its absolute magnitude. The absolute magnitude is a measure of the star's luminosity---the total amount of energy radiated by the star every second. ...
Weighing a Galaxy15 Nov 11/15/2010
... blob of gas orbits the galaxy. If the orbital speed is greater, the mass of the galaxy is greater. Mass ...
... blob of gas orbits the galaxy. If the orbital speed is greater, the mass of the galaxy is greater. Mass ...
Astronomy_Syllabus
... Late work: Late work will not be accepted. It is your responsibility to know when something is due, and to have it done by that time. Anyone who comes to me the day before the main lesson book is due and asks for an extension will not get it, barring exceptional circumstances. Exceptional circumstan ...
... Late work: Late work will not be accepted. It is your responsibility to know when something is due, and to have it done by that time. Anyone who comes to me the day before the main lesson book is due and asks for an extension will not get it, barring exceptional circumstances. Exceptional circumstan ...
Final Exam, Dec. 19, 2015 - Physics@Brock
... (b) some stars are circumpolar and some stars rise and set on the horizon. (c) all stars are circumpolar stars. 78. The celestial equator is (a) the projection of the Earth’s orbit on the celestial sphere. (b) the projection of the Earth’s equator on the celestial sphere. (c) the Sun’s apparent path ...
... (b) some stars are circumpolar and some stars rise and set on the horizon. (c) all stars are circumpolar stars. 78. The celestial equator is (a) the projection of the Earth’s orbit on the celestial sphere. (b) the projection of the Earth’s equator on the celestial sphere. (c) the Sun’s apparent path ...
Notes
... superwind dissipates, it will light up a planetary nebulae Temperatures from 25,000 K on up (to 300,000 K or even higher) Zanstra temperature - Measure brightness of star compared to brightness of nebula in optical hydrogen emission lines to estimate the uv/optical flux ratio to get temperature ...
... superwind dissipates, it will light up a planetary nebulae Temperatures from 25,000 K on up (to 300,000 K or even higher) Zanstra temperature - Measure brightness of star compared to brightness of nebula in optical hydrogen emission lines to estimate the uv/optical flux ratio to get temperature ...
Stars - Mike Brotherton
... The Deaths of Massive Stars: Supernovae Final stages of fusion in high-mass stars (> 8 Msun), leading to the formation of an iron core, happen extremely rapidly: Si burning lasts only for ~ 1 day. Iron core ultimately collapses, triggering an explosion that destroys the star: ...
... The Deaths of Massive Stars: Supernovae Final stages of fusion in high-mass stars (> 8 Msun), leading to the formation of an iron core, happen extremely rapidly: Si burning lasts only for ~ 1 day. Iron core ultimately collapses, triggering an explosion that destroys the star: ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.