galaxies and stars
... As temperature decreases, luminosity increases. As temperature decreases, luminosity remains the same. As temperature increases, luminosity increases. As temperature increases, luminosity remains the same. ...
... As temperature decreases, luminosity increases. As temperature decreases, luminosity remains the same. As temperature increases, luminosity increases. As temperature increases, luminosity remains the same. ...
s-process
... give us access to the state of the Universe at very early times Songaila & Cowie 2002 ...
... give us access to the state of the Universe at very early times Songaila & Cowie 2002 ...
Habitable Zones around Evolved Stars
... Factors determining the location of the habitable zone in evolved stars • L changes dramatically as a star evolves beyond the main sequence • ap is altered by changing M* or in extreme cases by tidal or gas drag • The albedoratio depends on planetary atmosphere, surface properties, => and the stell ...
... Factors determining the location of the habitable zone in evolved stars • L changes dramatically as a star evolves beyond the main sequence • ap is altered by changing M* or in extreme cases by tidal or gas drag • The albedoratio depends on planetary atmosphere, surface properties, => and the stell ...
white dwarfs, neutron stars, black hole
... fuse (because of iron's nuclear structure, it does not permit its atoms to fuse into heavier elements) and fusion ceases. In less than a second, the star begins the final phase of its gravitational collapse. The core temperature rises to over 100 billion degrees as the iron atoms are crushed togethe ...
... fuse (because of iron's nuclear structure, it does not permit its atoms to fuse into heavier elements) and fusion ceases. In less than a second, the star begins the final phase of its gravitational collapse. The core temperature rises to over 100 billion degrees as the iron atoms are crushed togethe ...
Penentuan Jarak dalam Astronomi II
... less than 0.5 Myr and, taking also in consideration the rarity of massive stars at all, we guess that Cepheids form very poor galactic population Statistics of Cepheids discovered: ~3000 proven and suspected in the Galaxy, ~2500 in the LMC, ~1500 in the SMC, ~Thousands are found and, ~50 000 are exp ...
... less than 0.5 Myr and, taking also in consideration the rarity of massive stars at all, we guess that Cepheids form very poor galactic population Statistics of Cepheids discovered: ~3000 proven and suspected in the Galaxy, ~2500 in the LMC, ~1500 in the SMC, ~Thousands are found and, ~50 000 are exp ...
Hubble - STScI
... observations provided the deepest views of the cosmos in visible, ultraviolet, and nearinfrared light. In the most recent foray into the farthest regions of the universe, Hubble uncovered 10,000 galaxies, some of which existed 400 to 800 million years after the Big Bang. Unlike our Milky Way Galaxy, ...
... observations provided the deepest views of the cosmos in visible, ultraviolet, and nearinfrared light. In the most recent foray into the farthest regions of the universe, Hubble uncovered 10,000 galaxies, some of which existed 400 to 800 million years after the Big Bang. Unlike our Milky Way Galaxy, ...
MAIN SEQUENCE STARS, Red Giants and White Dwarfs
... slower fusion rates, giving them smaller luminosities and longer lifetimes ...
... slower fusion rates, giving them smaller luminosities and longer lifetimes ...
ppt
... positions as a function of epoch over all plates on which a star appears. New proper motions are calculated, and the process is iterated until it converges to the final proper motion values. Proper-motion uncertainties are determined from the scatter about the best-fit line. Typically, the reference ...
... positions as a function of epoch over all plates on which a star appears. New proper motions are calculated, and the process is iterated until it converges to the final proper motion values. Proper-motion uncertainties are determined from the scatter about the best-fit line. Typically, the reference ...
ADAS Simple Guide to Telescope Instrumentation and Operation
... celestial equator. This position is known as the first point in Aries in the constellation of Pisces. The RAs are measured east to west, therefore, for example, the Pole star is at an RA 2h 31m east of the RA, at the Vernal Equinox, which is 0 hours, the starting point. To carry out constellation, s ...
... celestial equator. This position is known as the first point in Aries in the constellation of Pisces. The RAs are measured east to west, therefore, for example, the Pole star is at an RA 2h 31m east of the RA, at the Vernal Equinox, which is 0 hours, the starting point. To carry out constellation, s ...
Scientific Notation Worksheet
... distance. By definition a light-year is the distance that light travels in one year. To calculate the distance of one light-year, you determine the number of seconds in a year and then multiply that number by the speed of light. Light is the fastest thing we know of, as it travels at an incredible 1 ...
... distance. By definition a light-year is the distance that light travels in one year. To calculate the distance of one light-year, you determine the number of seconds in a year and then multiply that number by the speed of light. Light is the fastest thing we know of, as it travels at an incredible 1 ...
Cepheid
... In Shapley’s day, the LMC and SMC were considered as two isolated offshoots of the Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
... In Shapley’s day, the LMC and SMC were considered as two isolated offshoots of the Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
Far Ultraviolet Spectroscopic Explorer
... Search data set for interesting individual objects that represent rare classes of objects. ...
... Search data set for interesting individual objects that represent rare classes of objects. ...
Document
... Venn & Lambert (2008) have argued that this may not be the case. Peculiar stars such as post AGB stars and l Boo stars have iron abundances as low as [Fe/H] ~ –5. These are thought to be due to the separation of gas and dust beyond the stellar surface followed by an accretion of the dust-depleted g ...
... Venn & Lambert (2008) have argued that this may not be the case. Peculiar stars such as post AGB stars and l Boo stars have iron abundances as low as [Fe/H] ~ –5. These are thought to be due to the separation of gas and dust beyond the stellar surface followed by an accretion of the dust-depleted g ...
PDF file - Memorie della SAIt
... bottom): the inner border of the convective envelope, the location of the maximum nuclear energy production within the H-rich layer, the location of the maximum nuclear energy production within the He-rich layer. are commonly observed in the galactic halo. At variance with the C(N) stars commonly ob ...
... bottom): the inner border of the convective envelope, the location of the maximum nuclear energy production within the H-rich layer, the location of the maximum nuclear energy production within the He-rich layer. are commonly observed in the galactic halo. At variance with the C(N) stars commonly ob ...
The Star-Galaxy Era of Big History in the Light of Universal
... The main structural elements of the Universe are galaxies, their clusters, and superclusters. All the structural elements are rather stable in terms of gravitation, though they can split, merge, and collide. Galaxies are integral structural entities with a rather complex structure which includes, in ...
... The main structural elements of the Universe are galaxies, their clusters, and superclusters. All the structural elements are rather stable in terms of gravitation, though they can split, merge, and collide. Galaxies are integral structural entities with a rather complex structure which includes, in ...
November News Letter - Boise Astronomical Society
... handy, then scan downward from the middle star in Orion’s Belt. These stars represent his sword and the second star in the sword should look a little fuzzy. That fuzzy spot is located 1,300 light years away and it’s not a star. It’s a seething cauldron of star formation. Astronomers count at least 7 ...
... handy, then scan downward from the middle star in Orion’s Belt. These stars represent his sword and the second star in the sword should look a little fuzzy. That fuzzy spot is located 1,300 light years away and it’s not a star. It’s a seething cauldron of star formation. Astronomers count at least 7 ...
Galaxies - University of Iowa Astrophysics
... Why are Cepheid variable stars useful in determining distances? A) They all have the same distance. B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
... Why are Cepheid variable stars useful in determining distances? A) They all have the same distance. B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
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.