Stellar Classification and Evolution What is a star? A cloud of gas
... In _________ mass stars (0.4 – 8.0 x solar mass) strong solar winds and energy bursts from helium fusion _____________ much of their mass The ejected material expands and cools, becoming a planetary ________________ (which actually has nothing to do with planets, but we didn’t know that in the 1 ...
... In _________ mass stars (0.4 – 8.0 x solar mass) strong solar winds and energy bursts from helium fusion _____________ much of their mass The ejected material expands and cools, becoming a planetary ________________ (which actually has nothing to do with planets, but we didn’t know that in the 1 ...
October 2011
... dome and waited for it to get dark. It wasn’t long before the shutter was opened and we saw stars above the dome. What a wonderful sight. By about 7:30 we were observing. First we looked at Vega and then Epsilon Lyrae (the Double, Double) just to get an idea of what the seeing was like. On a scale o ...
... dome and waited for it to get dark. It wasn’t long before the shutter was opened and we saw stars above the dome. What a wonderful sight. By about 7:30 we were observing. First we looked at Vega and then Epsilon Lyrae (the Double, Double) just to get an idea of what the seeing was like. On a scale o ...
For stars
... first magnitude stars. Later, when twilight is over, more stars are visible. These are the second magnitude stars, and so on…Is this apparent magnitude or absolute magnitude? ...
... first magnitude stars. Later, when twilight is over, more stars are visible. These are the second magnitude stars, and so on…Is this apparent magnitude or absolute magnitude? ...
Down Under from North Florida
... Centauri. (Magnitudes from Observer's Handbook 2015.) In addition, one of the heavens most spectacular deep sky objects, especially in moderate sized scopes, is Omega Centauri (NGC 5139). This gorgeous globular cluster in the constellation of Centaurus is usually thought to be out of reach from the ...
... Centauri. (Magnitudes from Observer's Handbook 2015.) In addition, one of the heavens most spectacular deep sky objects, especially in moderate sized scopes, is Omega Centauri (NGC 5139). This gorgeous globular cluster in the constellation of Centaurus is usually thought to be out of reach from the ...
Document
... 10. Massive stars, when collapses under its own gravity, may become a neutron star. Its outer envelope can be blown off in a spectacular explosion that is known as a supernova. 11. Neutron stars are effectively a big “nucleus” consisting of neutrons worth of 2-3 solar masses. Some neutron stars spin ...
... 10. Massive stars, when collapses under its own gravity, may become a neutron star. Its outer envelope can be blown off in a spectacular explosion that is known as a supernova. 11. Neutron stars are effectively a big “nucleus” consisting of neutrons worth of 2-3 solar masses. Some neutron stars spin ...
December
... production from all sources of fuel. Because the surface-area-tomass ratio of our planet (like all large rocky worlds) is small, that energy has a hard time escaping, building-up and releasing sporadically in catastrophic events: volcanoes and earthquakes! Yet volcanoes occur on worlds that you migh ...
... production from all sources of fuel. Because the surface-area-tomass ratio of our planet (like all large rocky worlds) is small, that energy has a hard time escaping, building-up and releasing sporadically in catastrophic events: volcanoes and earthquakes! Yet volcanoes occur on worlds that you migh ...
here
... between 0.8 AU and 1.5 AU. • AU- Astronomical Unit is equal to the distance between the Earth and the Sun. ...
... between 0.8 AU and 1.5 AU. • AU- Astronomical Unit is equal to the distance between the Earth and the Sun. ...
Astronomy Assignment #1
... as indicated by their equal angular distances from the center of mass, the mass of each star is 54.5 solar masses. If these stars were main sequence stars they would have to be O stars with such a high mass. ...
... as indicated by their equal angular distances from the center of mass, the mass of each star is 54.5 solar masses. If these stars were main sequence stars they would have to be O stars with such a high mass. ...
ppt
... Trick: Exploit the fact that the RV period from the planet is much shorter than the period expected from spots and stellar rotation ...
... Trick: Exploit the fact that the RV period from the planet is much shorter than the period expected from spots and stellar rotation ...
ASTRONOMY 120
... The star has a carbon core in which a small amount fuses with helium to form oxygen. Around the core, helium continues to fuse into carbon, and outside this region, hydrogen fuses into helium. The temperature of the core is about 300 million K, too cool to fuse carbon on a large scale. The heat of ...
... The star has a carbon core in which a small amount fuses with helium to form oxygen. Around the core, helium continues to fuse into carbon, and outside this region, hydrogen fuses into helium. The temperature of the core is about 300 million K, too cool to fuse carbon on a large scale. The heat of ...
–1– Lectures 18 and 19 Optical Depth vs. Density Imaging a sphere
... HR diagram where we expect young pre-main sequence stars to appear after the protostellar phase, i.e. the luminosity and temperature of a pre-main sequence star of mass M at its initial radius R. To get the stellar birthline, we calculate the mass and radius of a protostar as it evolves in time. The ...
... HR diagram where we expect young pre-main sequence stars to appear after the protostellar phase, i.e. the luminosity and temperature of a pre-main sequence star of mass M at its initial radius R. To get the stellar birthline, we calculate the mass and radius of a protostar as it evolves in time. The ...
Lab 8: Stellar Classification and the H
... As early as the beginning of the 19th century, scientists have studied absorption spectra in an effort to classify stars. At first, spectra were divided into groups by general appearance; however, in the 1930’s and 1940’s, astronomers realized that spectral type was mainly determined by temperature ...
... As early as the beginning of the 19th century, scientists have studied absorption spectra in an effort to classify stars. At first, spectra were divided into groups by general appearance; however, in the 1930’s and 1940’s, astronomers realized that spectral type was mainly determined by temperature ...
giant molecular clouds
... Protostars Protostars = pre-birth state of stars: Hydrogen to Helium fusion not yet ignited ...
... Protostars Protostars = pre-birth state of stars: Hydrogen to Helium fusion not yet ignited ...
Highlights of the Month - Bridgend Astronomical Society
... skies, see a region which is darker than the surroundings. This is called the Cygnus Rift and is caused by the obscuration of light from distant stars by a lane of dust in our local spiral arm. the dust comes from elements such as carbon which have been built up in stars and ejected into space in ex ...
... skies, see a region which is darker than the surroundings. This is called the Cygnus Rift and is caused by the obscuration of light from distant stars by a lane of dust in our local spiral arm. the dust comes from elements such as carbon which have been built up in stars and ejected into space in ex ...
8.4 White Dwarfs
... to the low energy radio photons. This indicates that the source of theradiation, over a range of wavelengths, is from the same region on the neutron star. The fact that the pulses of radiation are so sharp and regular allows an astronomer to make very accurate measurements of the period of the pulse ...
... to the low energy radio photons. This indicates that the source of theradiation, over a range of wavelengths, is from the same region on the neutron star. The fact that the pulses of radiation are so sharp and regular allows an astronomer to make very accurate measurements of the period of the pulse ...
CONSTELLATION CASSIOPEIA named after the
... Perseus, whom she later married. But that’s another story. Cassiopeia herself was forced to wheel around the North Celestial Pole on her throne, spending half of her time clinging to it so she does not fall off. In the 1997 film Contact starring Jodie Foster and Matthew McConaughey, Doctor Arroway s ...
... Perseus, whom she later married. But that’s another story. Cassiopeia herself was forced to wheel around the North Celestial Pole on her throne, spending half of her time clinging to it so she does not fall off. In the 1997 film Contact starring Jodie Foster and Matthew McConaughey, Doctor Arroway s ...
giant molecular clouds
... Protostars Protostars = pre-birth state of stars: Hydrogen to Helium fusion not yet ignited ...
... Protostars Protostars = pre-birth state of stars: Hydrogen to Helium fusion not yet ignited ...
The Birth of Stars
... 1. Why do astronomers think that stars evolve (bad use of term – this is about the birth, life and death of stars and that is NOT evolution)? 2. What kind of matter exists in the spaces between the stars? 3. In what kind of nebulae do new stars form? 4. What steps are involved in forming a star like ...
... 1. Why do astronomers think that stars evolve (bad use of term – this is about the birth, life and death of stars and that is NOT evolution)? 2. What kind of matter exists in the spaces between the stars? 3. In what kind of nebulae do new stars form? 4. What steps are involved in forming a star like ...
Slide 1
... Hot Jupiters modify our solar system theories If hot Jupiters did not form where they are seen today, it is possible their orbits shifted? Density wave braking Gravitational effects from the planetary disk. This would work on planets that formed early, when the proto-planetary disk was still thick, ...
... Hot Jupiters modify our solar system theories If hot Jupiters did not form where they are seen today, it is possible their orbits shifted? Density wave braking Gravitational effects from the planetary disk. This would work on planets that formed early, when the proto-planetary disk was still thick, ...
Star of Bethlehem
In Christian tradition, the Star of Bethlehem, also called the Christmas Star, revealed the birth of Jesus to the Biblical Magi, and later led them to Bethlehem. The star appears only in the nativity story of the Gospel of Matthew, where astrologers from the east are inspired by the star to travel to Jerusalem. There they meet King Herod of Judea, and ask where the king of the Jews had been born. Herod, following a verse from the Book of Micah interpreted as a prophecy, directs them to Bethlehem, to the south of Jerusalem. The star leads them to Jesus' home in the town, where they worship him and give him gifts. The wise men are then given a divine warning not to return to Herod so they return home by a different route.Many Christians see the star as a miraculous sign to mark the birth of the Christ (or messiah). Some theologians claimed that the star fulfilled a prophecy, known as the Star Prophecy. Astronomers have made several attempts to link the star to unusual astronomical events, such as a conjunction of Jupiter and Saturn, a comet or a supernova.Many modern scholars do not consider the story to be describing a historical event but a pious fiction created by the author of the Gospel of Matthew.The subject is a favorite at planetarium shows during the Christmas season, although the Biblical account describes Jesus with a broader Greek word, which can mean either ""infant"" or ""child"" (paidon), rather than the more specific word for infant (brephos), possibly implying that some time has passed since the birth. The visit is traditionally celebrated on Epiphany (January 6) in Western Christianity.