Lecture 3 - University of Washington
... Spiral arms cannot be a static structure (i.e. at different times, arms must be made of different stars) ...
... Spiral arms cannot be a static structure (i.e. at different times, arms must be made of different stars) ...
Unit 13―The “Fixed” Stars
... 186. Classification by magnitudes. Stars that can only be made visible by means of a telescope are generally called telescopic and those that can be visible to the unaided eye are called lucid. (Have you ever heard someone state, “Now let me make this lucidly clear?”) As soon as telescopes started m ...
... 186. Classification by magnitudes. Stars that can only be made visible by means of a telescope are generally called telescopic and those that can be visible to the unaided eye are called lucid. (Have you ever heard someone state, “Now let me make this lucidly clear?”) As soon as telescopes started m ...
Lecture 15 Star Formation and Evolution 3/7
... • if Mass(WD) > 1.4 M(Sun) degenerate electrons can not resist gravity called Chandrasekhar limit and no WD has a mass greater than this • If WD can acquire mass from companion star and goes over this limit Supernova and (usually) a Neutron Star ...
... • if Mass(WD) > 1.4 M(Sun) degenerate electrons can not resist gravity called Chandrasekhar limit and no WD has a mass greater than this • If WD can acquire mass from companion star and goes over this limit Supernova and (usually) a Neutron Star ...
ASTRONOMY 113 Modern Astronomy
... Stars at different distances all appear to lie on the Celestial Sphere. Ecliptic is Sun’s apparent path through the celestial sphere. ...
... Stars at different distances all appear to lie on the Celestial Sphere. Ecliptic is Sun’s apparent path through the celestial sphere. ...
A Search for New Solar-Type Post-T Tauri Stars in
... gravities of 5.0 (blue), 4.0 (green), and 3.0 (red) with redder UV-J colors at lower surface gravity in spectral types earlier than M. The young stars targetted in our investigation are expected to have surface gravity values between 4.2 and 5.0. Symbols represent a cross-correlation of a GalEx earl ...
... gravities of 5.0 (blue), 4.0 (green), and 3.0 (red) with redder UV-J colors at lower surface gravity in spectral types earlier than M. The young stars targetted in our investigation are expected to have surface gravity values between 4.2 and 5.0. Symbols represent a cross-correlation of a GalEx earl ...
AST 112 – Activity #4 The Stellar Magnitude System
... The distance unit called the parsec (pc) is the distance at which an object shows a parallax of one arcsecond. It is also 3.26 Light Years, or 26 trillion miles. For convenience sake, astronomers define an object’s absolute magnitude to equal its apparent magnitude as seen from a distance of 10 pc. ...
... The distance unit called the parsec (pc) is the distance at which an object shows a parallax of one arcsecond. It is also 3.26 Light Years, or 26 trillion miles. For convenience sake, astronomers define an object’s absolute magnitude to equal its apparent magnitude as seen from a distance of 10 pc. ...
Space astrometry 2: Scientific results from Hipparcos
... • monitoring Sun-like stars within 60 pc probes activity versus age (Wright 2004, 2006) (3) Various other studies of Sun’s orbit, spiral arm + Galactic plane passages (vertical oscillation period ~ 82 Myr), cratering records, geological crustal features, and relation between cosmic ray production an ...
... • monitoring Sun-like stars within 60 pc probes activity versus age (Wright 2004, 2006) (3) Various other studies of Sun’s orbit, spiral arm + Galactic plane passages (vertical oscillation period ~ 82 Myr), cratering records, geological crustal features, and relation between cosmic ray production an ...
PowerPoint
... a) Clouds fragment into smaller objects, forming many stars at one time. b) One star forms; other matter goes into planets, moons, asteroids, & comets. c) Clouds rotate & throw off mass until only enough is left to form one star. ...
... a) Clouds fragment into smaller objects, forming many stars at one time. b) One star forms; other matter goes into planets, moons, asteroids, & comets. c) Clouds rotate & throw off mass until only enough is left to form one star. ...
PH607lec08
... that cluster galaxies commonly interact. Over time, the galaxy interactions are likely to affect the content of the cluster itself. Researchers believe that the Hercules Cluster is significantly similar to young galaxy clusters in the distant, early Universe and that exploring galaxy types and their ...
... that cluster galaxies commonly interact. Over time, the galaxy interactions are likely to affect the content of the cluster itself. Researchers believe that the Hercules Cluster is significantly similar to young galaxy clusters in the distant, early Universe and that exploring galaxy types and their ...
Procedurally Generating an Artificial Galaxy
... simple game. Space is a popular environment for procedural generation, partly because of the scope, and partly because of the relative ease of mimicking the superficial arrangement of celestial bodies. What follows is just a rudimentary example, but a rather powerful one at that. We will place stars ...
... simple game. Space is a popular environment for procedural generation, partly because of the scope, and partly because of the relative ease of mimicking the superficial arrangement of celestial bodies. What follows is just a rudimentary example, but a rather powerful one at that. We will place stars ...
The Rocket Science of Launching Stellar Disks
... • This is from Doppler shift of gas moving toward and away from the observer . ...
... • This is from Doppler shift of gas moving toward and away from the observer . ...
Frontiers: Intermediate-Mass Black Holes For our final lecture we will
... 1039 erg s−1 . Ask class: what is special about this value? It is the Eddington luminosity for a 10 − 20 M¯ object. Since various models of stellar evolution suggest that solitary stars in the current universe don’t evolve into black holes more massive than about 20 M ¯ , luminosities beyond the as ...
... 1039 erg s−1 . Ask class: what is special about this value? It is the Eddington luminosity for a 10 − 20 M¯ object. Since various models of stellar evolution suggest that solitary stars in the current universe don’t evolve into black holes more massive than about 20 M ¯ , luminosities beyond the as ...
The Origin, Structure, and Evolution of the Stars
... stage the central temperatures may be high enough (200,000,000° F) to ignite helium as a new nuclear fuel. In this new reaction helium nuclei are converted to the nuclei of carbon and other heavier elements. The length of time that a star remains a red giant is not well known, but the observational ...
... stage the central temperatures may be high enough (200,000,000° F) to ignite helium as a new nuclear fuel. In this new reaction helium nuclei are converted to the nuclei of carbon and other heavier elements. The length of time that a star remains a red giant is not well known, but the observational ...
CHAPTER 14
... their colors resemble the colors of Neptune and Uranus when seen through a small telescope. 3. The material in the shell glows because UV radiation from the central hot star causes it to fluoresce. 4. Pulsations in the core of the red giant and/or stellar winds emitted from the dying star (and which ...
... their colors resemble the colors of Neptune and Uranus when seen through a small telescope. 3. The material in the shell glows because UV radiation from the central hot star causes it to fluoresce. 4. Pulsations in the core of the red giant and/or stellar winds emitted from the dying star (and which ...
Part I Light, Telescopes, Atoms and Stars
... Near the center (the core) of the sun nuclear fusion is proceeding generating tremendous energy (4.7 million tons per second from E=mc2 and 3.9x1026 J/s luminosity) This is surrounded by the radiation zone – photons must take the energy out – random walk – 500,000 years! ...
... Near the center (the core) of the sun nuclear fusion is proceeding generating tremendous energy (4.7 million tons per second from E=mc2 and 3.9x1026 J/s luminosity) This is surrounded by the radiation zone – photons must take the energy out – random walk – 500,000 years! ...
Properties of Supernovae
... Supernova explosions are the most powerful events in the Universe. In less than a second, about 1044 Joules of energy are released---about the same as the Sun has released in its entire lifetime! The explosion results from the death of a massive star which has consumed its entire fuel supply. The ap ...
... Supernova explosions are the most powerful events in the Universe. In less than a second, about 1044 Joules of energy are released---about the same as the Sun has released in its entire lifetime! The explosion results from the death of a massive star which has consumed its entire fuel supply. The ap ...
First Light Sources at the End of the Dark Ages: Direct
... The latter quantity is inferred from ultraviolet and far-infrared emission, which are dominated by the most massive stars, while the stellar mass of galaxies is dominated by lower mass stars. The fact that the integral of the star-formation rate density appears to be a factor of 2 higher than the s ...
... The latter quantity is inferred from ultraviolet and far-infrared emission, which are dominated by the most massive stars, while the stellar mass of galaxies is dominated by lower mass stars. The fact that the integral of the star-formation rate density appears to be a factor of 2 higher than the s ...
- Cosmotography
... A candidate diffuse stellar substructure was previously reported in the halo of the nearby dwarf starburst galaxy NGC 4449 by Karachentsev et al. We map and analyze this feature using a unique combination of deep integrated-light images from the Black Bird 0.5-meter telescope, and high-resolution wi ...
... A candidate diffuse stellar substructure was previously reported in the halo of the nearby dwarf starburst galaxy NGC 4449 by Karachentsev et al. We map and analyze this feature using a unique combination of deep integrated-light images from the Black Bird 0.5-meter telescope, and high-resolution wi ...
Solutions to Homework #4, AST 203, Spring 2009
... value seems wrong, take three points off. Answers differing slightly from the solutions given here because of slightly different rounding (e.g., off in the second decimal point for results that should be given to two significant figures) get full credit. Two points off per question for not being exp ...
... value seems wrong, take three points off. Answers differing slightly from the solutions given here because of slightly different rounding (e.g., off in the second decimal point for results that should be given to two significant figures) get full credit. Two points off per question for not being exp ...
03jan13.ppt - Institute for Astronomy
... • The Earth’s axis is tilted 23.5° from being perpendicular to the ecliptic plane. • Therefore, the celestial equator is tilted 23.5° to the ecliptic. • As seen from Earth, the Sun spends 6 months north of the celestial equator and 6 months south of the celestial equator. ...
... • The Earth’s axis is tilted 23.5° from being perpendicular to the ecliptic plane. • Therefore, the celestial equator is tilted 23.5° to the ecliptic. • As seen from Earth, the Sun spends 6 months north of the celestial equator and 6 months south of the celestial equator. ...
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.