AS2001 - University of St Andrews
... No Pop III (Z=0) stars seen (were they all high mass?). Infall of Z = 0 material causes Z => y. Z » min [ y, y ln(1/ m )] ...
... No Pop III (Z=0) stars seen (were they all high mass?). Infall of Z = 0 material causes Z => y. Z » min [ y, y ln(1/ m )] ...
death_low_mass
... • Stars form in clusters, with all types of stars forming. O,B,A,F,G,K,M • Spiral arms barely move, but gas clouds and stars orbit around the galaxy moving in and out of spiral arms • From the HR diagram, by far the most luminous stars are the O-type stars. Their luminosity can be 100,000 times the ...
... • Stars form in clusters, with all types of stars forming. O,B,A,F,G,K,M • Spiral arms barely move, but gas clouds and stars orbit around the galaxy moving in and out of spiral arms • From the HR diagram, by far the most luminous stars are the O-type stars. Their luminosity can be 100,000 times the ...
NGC 3370 Spiral Galaxy
... • Stars form in clusters, with all types of stars forming. O,B,A,F,G,K,M • Spiral arms barely move, but gas clouds and stars orbit around the galaxy moving in and out of spiral arms • From the HR diagram, by far the most luminous stars are the O-type stars. Their luminosity can be 100,000 times the ...
... • Stars form in clusters, with all types of stars forming. O,B,A,F,G,K,M • Spiral arms barely move, but gas clouds and stars orbit around the galaxy moving in and out of spiral arms • From the HR diagram, by far the most luminous stars are the O-type stars. Their luminosity can be 100,000 times the ...
astrocoursespring2012lec4
... Society of Canada, JRASC, and was active member in a number of professional societies. She also began categorizing clusters according to the degree of concentration the system has toward the core. The most concentrated cluster ...
... Society of Canada, JRASC, and was active member in a number of professional societies. She also began categorizing clusters according to the degree of concentration the system has toward the core. The most concentrated cluster ...
Time From the Perspective of a Particle Physicist
... What to Remember - EW • What time during the day a star rises, is overhead, and sets changes with the seasons • look up on Star Chart (right ascension is the East-West location) • Changes 2 hours/month • Only on the Equator can all stars be viewed from a single location Hawaii or northern Chile a ...
... What to Remember - EW • What time during the day a star rises, is overhead, and sets changes with the seasons • look up on Star Chart (right ascension is the East-West location) • Changes 2 hours/month • Only on the Equator can all stars be viewed from a single location Hawaii or northern Chile a ...
MS Word version
... line drawn through them points toward Polaris (a very important marker in the sky since it is located very near the NCP). Use the constellations control to add the Big Dipper to the celestial sphere. Now manipulate the observer's location to estimate where on the Earth the Big Dipper can always be s ...
... line drawn through them points toward Polaris (a very important marker in the sky since it is located very near the NCP). Use the constellations control to add the Big Dipper to the celestial sphere. Now manipulate the observer's location to estimate where on the Earth the Big Dipper can always be s ...
Class 12 : Star formation I : The Interstellar Medium (ISM)
... A gas cloud of density ρ and temperature T collapses if its mass is above a critical amount given by… ...
... A gas cloud of density ρ and temperature T collapses if its mass is above a critical amount given by… ...
Chapter 12 - Indiana State University
... Analyzing the HR Diagram • The Stefan-Boltzmann law is a key to understanding the H-R diagram – For stars of a given temperature, the larger the radius, the larger the luminosity – Therefore, as one moves up the H-R diagram, a star’s radius must become bigger – On the other hand, for a given lumino ...
... Analyzing the HR Diagram • The Stefan-Boltzmann law is a key to understanding the H-R diagram – For stars of a given temperature, the larger the radius, the larger the luminosity – Therefore, as one moves up the H-R diagram, a star’s radius must become bigger – On the other hand, for a given lumino ...
PHYS-638-07f: Problem set #0 Solutions
... Remembering that the brightest stars are around magnitude zero, we see that the sun would still be a very bright star, about 10,000 times brighter than the brightest actual star! (Since m=-10 is 10 magnitudes brighter than m=0, and each difference of 5 in magnitude represents a factor 100 in brightn ...
... Remembering that the brightest stars are around magnitude zero, we see that the sun would still be a very bright star, about 10,000 times brighter than the brightest actual star! (Since m=-10 is 10 magnitudes brighter than m=0, and each difference of 5 in magnitude represents a factor 100 in brightn ...
11 - Visual Magnitudes Project
... Attached is a finding chart for the brighter stars in the open star cluster named Praesepe or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is ...
... Attached is a finding chart for the brighter stars in the open star cluster named Praesepe or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is ...
Astronomy 252: Short Project 2 Stellar Spectra: Their Classification
... From the lectures you already know that stars come in a wide range of sizes and temperatures. The hottest stars in the sky have temperatures in excess of 40,000 K, whereas the coolest stars that we can detect optically have temperatures on the order of 2000 - 3000 K. As you might guess, the appearan ...
... From the lectures you already know that stars come in a wide range of sizes and temperatures. The hottest stars in the sky have temperatures in excess of 40,000 K, whereas the coolest stars that we can detect optically have temperatures on the order of 2000 - 3000 K. As you might guess, the appearan ...
Structure of the Universe
... Supernova Standard Candles Type Ia supernovae are not exploding massive stars, but rather a white dwarf that accretes mass from a companion until it exceeds the Chandrasekhar limit (1.4 Msun) ...
... Supernova Standard Candles Type Ia supernovae are not exploding massive stars, but rather a white dwarf that accretes mass from a companion until it exceeds the Chandrasekhar limit (1.4 Msun) ...
TMSP Stellar Evolution & Life
... instruments, function of distance as well as intrinsic brightness or luminosity. •LUMINOSITY: how much energy the star is actually generating is a function of its mass (or size) and temperature (the big vs small bonfire analogy). •TEMPERATURE: stars vary in temperature; more massive stars take a sho ...
... instruments, function of distance as well as intrinsic brightness or luminosity. •LUMINOSITY: how much energy the star is actually generating is a function of its mass (or size) and temperature (the big vs small bonfire analogy). •TEMPERATURE: stars vary in temperature; more massive stars take a sho ...
Lecture 9: Hydrostatic Equilibrium
... surface of the star. Winds are a common feature of massive stars. Also, at some point, the radiation pressure may make it impossible to form a more luminous star than a certain limit. This is known as the Eddington limit and we’ll talk about it more later. It sets a limit on the luminosity that an o ...
... surface of the star. Winds are a common feature of massive stars. Also, at some point, the radiation pressure may make it impossible to form a more luminous star than a certain limit. This is known as the Eddington limit and we’ll talk about it more later. It sets a limit on the luminosity that an o ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.