Chapter 10. Stellar Spectra
... For stars of lower temperature than A (i.e. the FGK and M stars) the Hydrogen is mostly still in the ground state. There is not enough kinetic energy around, in general, or photons of high enough energy to excite the atoms to n - 2. Hence, although there is a lot of HI, there is not a very strong se ...
... For stars of lower temperature than A (i.e. the FGK and M stars) the Hydrogen is mostly still in the ground state. There is not enough kinetic energy around, in general, or photons of high enough energy to excite the atoms to n - 2. Hence, although there is a lot of HI, there is not a very strong se ...
File - Mr. Pelton Science
... • Galaxy clusters larger than the Local Group may have hundreds or thousands of members with diameters up to 30 million ly across. • Galaxies close together often collide to form strangely shaped galaxies or galaxies with more than one nucleus (Andromeda) ...
... • Galaxy clusters larger than the Local Group may have hundreds or thousands of members with diameters up to 30 million ly across. • Galaxies close together often collide to form strangely shaped galaxies or galaxies with more than one nucleus (Andromeda) ...
The Classification of Galaxies By Daniel Underwood Contents The
... nebulae outside the Milky Way we realised, and it became universally accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, ...
... nebulae outside the Milky Way we realised, and it became universally accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, ...
Leaving the Main Sequence
... • Degenerate-electron pressure is independent of temperature. • He heats up, He burning happens faster. • Without having a “ pressure safety valve”, temperature becomes too high to make the ...
... • Degenerate-electron pressure is independent of temperature. • He heats up, He burning happens faster. • Without having a “ pressure safety valve”, temperature becomes too high to make the ...
Spica The Star - Emmi
... Spica in an HR Diagram This is Spica in an HR Diagram. As you can see Spica is located three places from the middle for the brightness and its surface temperature 25,000 fahrenhieght. ...
... Spica in an HR Diagram This is Spica in an HR Diagram. As you can see Spica is located three places from the middle for the brightness and its surface temperature 25,000 fahrenhieght. ...
Chapter 1: Introduction to Galaxies File - QMplus
... result of this continuing star formation. Spiral arms are apparent in the discs, defined by young, luminous stars and by H II regions. Spiral galaxies have a central bulge component containing mostly old stars. These bulges superficially resemble small elliptical galaxies. The disc and bulge are emb ...
... result of this continuing star formation. Spiral arms are apparent in the discs, defined by young, luminous stars and by H II regions. Spiral galaxies have a central bulge component containing mostly old stars. These bulges superficially resemble small elliptical galaxies. The disc and bulge are emb ...
The Wise Centaur - Interactive Stars
... These twenty two lost star signs reconnect us to the ancient vision of a sacred, living cosmos, and to the great celestial sphere around us. Your Sign Beyond the Zodiac Linked to your Sun Sign These star signs are the ancient constellations which lie to the North and South of the zodiac band of star ...
... These twenty two lost star signs reconnect us to the ancient vision of a sacred, living cosmos, and to the great celestial sphere around us. Your Sign Beyond the Zodiac Linked to your Sun Sign These star signs are the ancient constellations which lie to the North and South of the zodiac band of star ...
Problem Set No. 5
... A one solar mass star will spend 10 billion years on the main sequence. The universe is only 13-14 billion years old. From the formula T = 1/M 2.5 and the sun’s lifetime, we see that a star of 0.9 solar masses should spend 13 billion years on the main sequence. So no stars of lower mass would have h ...
... A one solar mass star will spend 10 billion years on the main sequence. The universe is only 13-14 billion years old. From the formula T = 1/M 2.5 and the sun’s lifetime, we see that a star of 0.9 solar masses should spend 13 billion years on the main sequence. So no stars of lower mass would have h ...
Death of Stars notes
... but that the dust can survive the explosion to become raw material for the formation of other stars—and planets. • This result supports the notion that most of the dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, since no other known mechanis ...
... but that the dust can survive the explosion to become raw material for the formation of other stars—and planets. • This result supports the notion that most of the dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, since no other known mechanis ...
Characteristics of Our Galaxy
... to the age of the Galaxy). They show little if any structured or symmetric movements, and have highly eccentric orbits, although they do orbit at speeds comparable to the speeds at which disk stars at comparable distances from the center rotate. The Halo stars are believed to have formed very early ...
... to the age of the Galaxy). They show little if any structured or symmetric movements, and have highly eccentric orbits, although they do orbit at speeds comparable to the speeds at which disk stars at comparable distances from the center rotate. The Halo stars are believed to have formed very early ...
Galaxy Formation and Evolution Open Problems
... • Do galaxies, such as the Milky Way, form from accumulation of many smaller systems which have already initiated star formation? • Does star formation begin in a gravitational potential well in which much of the gas is already accumulated? • What is the nature and composition of matter in the galac ...
... • Do galaxies, such as the Milky Way, form from accumulation of many smaller systems which have already initiated star formation? • Does star formation begin in a gravitational potential well in which much of the gas is already accumulated? • What is the nature and composition of matter in the galac ...
All_Stars
... • All stars, regardless of their mass, spend roughly 90% of their total lifetimes as main sequence stars. • Stars end their main sequence lives when their supply of hydrogen fuel runs out in the core. • The most massive stars (O and B types) have very short lifetimes compared to low-mass stars (K an ...
... • All stars, regardless of their mass, spend roughly 90% of their total lifetimes as main sequence stars. • Stars end their main sequence lives when their supply of hydrogen fuel runs out in the core. • The most massive stars (O and B types) have very short lifetimes compared to low-mass stars (K an ...
Appendix - ClassZone
... Because Earth rotates, noon can occur in one location at the same moment that the Sun is setting in another location. To avoid confusion in transportation and communication, officials have divided Earth into 24 time zones. Within a time zone, clocks are set to the same time of day. Time zones are ce ...
... Because Earth rotates, noon can occur in one location at the same moment that the Sun is setting in another location. To avoid confusion in transportation and communication, officials have divided Earth into 24 time zones. Within a time zone, clocks are set to the same time of day. Time zones are ce ...
Structure of the solar system
... Cepheids: stars which brighten and dim periodically (more later) Red Giants: A star in a late stage of evolution. The outter atmosphere has inflated and its surface T is low. It is very luminous due to its large size. Supergiant: A more massive and larger Red Giant. More luminous than Red Giants due ...
... Cepheids: stars which brighten and dim periodically (more later) Red Giants: A star in a late stage of evolution. The outter atmosphere has inflated and its surface T is low. It is very luminous due to its large size. Supergiant: A more massive and larger Red Giant. More luminous than Red Giants due ...
The Stellar Cycle
... Msun < M < 8 Msun) in common? 3. What about red dwarfs (0.08 Msun < M < 0.5 Msun) ? 4. Where do stars spend most of their time? 5. Which is the faintest? the sun, an O star, a white dwarf, or a red giant? ...
... Msun < M < 8 Msun) in common? 3. What about red dwarfs (0.08 Msun < M < 0.5 Msun) ? 4. Where do stars spend most of their time? 5. Which is the faintest? the sun, an O star, a white dwarf, or a red giant? ...
Lecture 39
... Consequently there is an inverse relationship between the main sequence lifetime of a star and mass. The most massive stars, up to ~100 solar masses, have life expectancies of only about 106 years, whereas small stars, ~0.01 solar masses, remain on the main sequence for more than 1010 years. Stars a ...
... Consequently there is an inverse relationship between the main sequence lifetime of a star and mass. The most massive stars, up to ~100 solar masses, have life expectancies of only about 106 years, whereas small stars, ~0.01 solar masses, remain on the main sequence for more than 1010 years. Stars a ...
Standing in Awe - Auckland Astronomical Society
... square in size, Libra is one of the larger constellations, though its stars are poorly shown, the brightest attaining magnitude 2.6. In fact, Libra is one of the poorer adorned constellations, there being only 2.4 stars of magnitude 5 and brighter per 100° square. The brightest star is beta Librae, ...
... square in size, Libra is one of the larger constellations, though its stars are poorly shown, the brightest attaining magnitude 2.6. In fact, Libra is one of the poorer adorned constellations, there being only 2.4 stars of magnitude 5 and brighter per 100° square. The brightest star is beta Librae, ...
Study Guide for the Comprehensive Final Exam
... any latitude. 10. Draw the apparent motion of stars as seen by any observer looking North, East, South or West at any location in the northern hemisphere. 11. Define a constellation and distinguish it from an asterism. 12. Use celestial coordinates of Right Ascension and Declination appropriately in ...
... any latitude. 10. Draw the apparent motion of stars as seen by any observer looking North, East, South or West at any location in the northern hemisphere. 11. Define a constellation and distinguish it from an asterism. 12. Use celestial coordinates of Right Ascension and Declination appropriately in ...
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.