STELLAR FORMATION AND EVOLUTION
... region of young stars. As time goes on, stars change or evolve as the physics in their cores change. But for most of the lifetime of a star, it sits somewhere on the main sequence. We will begin by looking at what happens to most stars in the universe. These are the low mass stars. In space, there a ...
... region of young stars. As time goes on, stars change or evolve as the physics in their cores change. But for most of the lifetime of a star, it sits somewhere on the main sequence. We will begin by looking at what happens to most stars in the universe. These are the low mass stars. In space, there a ...
1 Sep: 6.13am BST 15 Sep: 6.43am BST 30 Sep: 7.14am BST
... 27th. September’s Full Moon is also called the Harvest Moon, as in earlier times its light allowed farmers to continue to harvest, as it rises in the east after sunset for several nights in succession. The Planets Mercury will be visible low in the East for about 1 hour before dawn. Venus is too clo ...
... 27th. September’s Full Moon is also called the Harvest Moon, as in earlier times its light allowed farmers to continue to harvest, as it rises in the east after sunset for several nights in succession. The Planets Mercury will be visible low in the East for about 1 hour before dawn. Venus is too clo ...
OBAFGKM(LT) extra credit due today. Mid
... Once stars are formed, they begin Fusing Hydrogen in the cores on the zero ...
... Once stars are formed, they begin Fusing Hydrogen in the cores on the zero ...
ppt
... • In our Galaxy, most of the gas lies in a flattened disk structure • We tend to find hot massive stars in clusters near big clouds of gas • In these regions we also find stars with rapid rotation, disks, jets, and magnetic activity • These stars are not on the Main Sequence (M.S.) We think that big ...
... • In our Galaxy, most of the gas lies in a flattened disk structure • We tend to find hot massive stars in clusters near big clouds of gas • In these regions we also find stars with rapid rotation, disks, jets, and magnetic activity • These stars are not on the Main Sequence (M.S.) We think that big ...
Time From the Perspective of a Particle Physicist
... core see in SN debris • p + e n + neutrino (and nuclei decaying) 1. Burst of neutrinos. 1000 times more energy than from light (photons) ...
... core see in SN debris • p + e n + neutrino (and nuclei decaying) 1. Burst of neutrinos. 1000 times more energy than from light (photons) ...
Star Types - College of Engineering and Computer Science
... Luminosity is an intrinsic property of a star, while apparent brightness depends on the distance to the observer. Luminosity is how bright a star really is, while apparent brightness is how bright a star appears to an observer. ...
... Luminosity is an intrinsic property of a star, while apparent brightness depends on the distance to the observer. Luminosity is how bright a star really is, while apparent brightness is how bright a star appears to an observer. ...
Document
... electron turning each electron-proton pair into a neutron. The neutrons, however, can often stop the collapse and remain as a neutron star. • Neutron stars are fascinating objects because they are the most dense objects known. They are only about 10 miles in diameter, yet they are more massive than ...
... electron turning each electron-proton pair into a neutron. The neutrons, however, can often stop the collapse and remain as a neutron star. • Neutron stars are fascinating objects because they are the most dense objects known. They are only about 10 miles in diameter, yet they are more massive than ...
A0620-00 poster
... models for dwarf nova outbursts must be compared (Cannizzo & Mattei 1992; Lasota 2001). The basic properties of SS Cyg are thought to be well established. The primary star is a white dwarf, the secondary is a K4-5 V star, and the orbital period is P = 0.27624 d. According to the Ritter and Kolb (199 ...
... models for dwarf nova outbursts must be compared (Cannizzo & Mattei 1992; Lasota 2001). The basic properties of SS Cyg are thought to be well established. The primary star is a white dwarf, the secondary is a K4-5 V star, and the orbital period is P = 0.27624 d. According to the Ritter and Kolb (199 ...
My power point presentation on spectroscopy of stars (ppt file)
... • Sometime fitting works reasonably well, but not perfectly • In this case we can often obtain approximate values of parameters such as chemical abundances, rotation, … • The remaining discrepancies give us information about physics missing from the model • For the supergiant omicron Scorpii, the di ...
... • Sometime fitting works reasonably well, but not perfectly • In this case we can often obtain approximate values of parameters such as chemical abundances, rotation, … • The remaining discrepancies give us information about physics missing from the model • For the supergiant omicron Scorpii, the di ...
Chapter 13
... Supernova Remnants • The huge, glowing cloud of debris that expands from a supernova explosion sweeping up interstellar material as it goes is called a supernova remnant – During a 1-100 year time frame, a supernova will expand from 0.03 ly to several light-years in diameter – Supernova remnants ha ...
... Supernova Remnants • The huge, glowing cloud of debris that expands from a supernova explosion sweeping up interstellar material as it goes is called a supernova remnant – During a 1-100 year time frame, a supernova will expand from 0.03 ly to several light-years in diameter – Supernova remnants ha ...
SR Stellar Properties
... 5. Our sun has a surface temperature of 6000 K and an absolute magnitude of + 4.7. Plot the Sun on the H-R diagram and label it ‘Sun’. 6. Betelgeuse is one of the largest stars in the night sky. It has a surface temperature of 3200 K and an absolute magnitude of – 5.5. To which group does Betelgeuse ...
... 5. Our sun has a surface temperature of 6000 K and an absolute magnitude of + 4.7. Plot the Sun on the H-R diagram and label it ‘Sun’. 6. Betelgeuse is one of the largest stars in the night sky. It has a surface temperature of 3200 K and an absolute magnitude of – 5.5. To which group does Betelgeuse ...
Supernovae Gamma-Ray Bursts and and some of their uses
... freshly synthesized heavy elements, and forms what is called a supernova remnant • Supernova remnants may be observed for hundreds of thousands of years as often beautiful, visual objects, but also as emitters of radio waves and X-rays • Close to 150 supernova remnants have been detected in the Milk ...
... freshly synthesized heavy elements, and forms what is called a supernova remnant • Supernova remnants may be observed for hundreds of thousands of years as often beautiful, visual objects, but also as emitters of radio waves and X-rays • Close to 150 supernova remnants have been detected in the Milk ...
PPV_hd169142
... The circumstellar light presents as an azimuthally-symmetric region which can be traced to (at least) ~ 1.3”. The PSFsubtracted images at both field orientations are consistent with a face-on viewing geometry as originally suggested by Dunkin et al. (1997) and found by Kuhn et al. (2001) with simult ...
... The circumstellar light presents as an azimuthally-symmetric region which can be traced to (at least) ~ 1.3”. The PSFsubtracted images at both field orientations are consistent with a face-on viewing geometry as originally suggested by Dunkin et al. (1997) and found by Kuhn et al. (2001) with simult ...
ASTR1102-002 Potentially useful facts and mathematical relations
... parallax of 0.15 arcsec/yr. Which star is moving through space with the faster speed? a. Star “A” is moving faster than star “B”. b. Star “B” is moving faster than star “A”. c. The stars are moving through space at the same speed. d. None of the above. (Briefly explain.) ANS: ...
... parallax of 0.15 arcsec/yr. Which star is moving through space with the faster speed? a. Star “A” is moving faster than star “B”. b. Star “B” is moving faster than star “A”. c. The stars are moving through space at the same speed. d. None of the above. (Briefly explain.) ANS: ...
Comets, asteroids, and meteors oh my!
... • Chunks of ice and dust whose orbits are usually very long, narrow ellipses. – Ellipses are elongated narrow circles – Think of it as a squashed oval. • About the size of a mountain, so rather large • We don’t see them very often. • Comet in Greek means “long-haired star” ...
... • Chunks of ice and dust whose orbits are usually very long, narrow ellipses. – Ellipses are elongated narrow circles – Think of it as a squashed oval. • About the size of a mountain, so rather large • We don’t see them very often. • Comet in Greek means “long-haired star” ...
Lecture 1
... In the same box, draw another x to indicate the position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider ...
... In the same box, draw another x to indicate the position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider ...
High Mass Stars
... – From H-R diagram its luminosity is 100000 times greater than the Sun’s. – It therefore burns fuel (uses it’s mass) 100000 times faster than the Sun. – It has 25 times the mass of the Sun so its lifetime will be 25/100000 = 0.00025 times than the Sun’s lifetime = 2.5 million years. ...
... – From H-R diagram its luminosity is 100000 times greater than the Sun’s. – It therefore burns fuel (uses it’s mass) 100000 times faster than the Sun. – It has 25 times the mass of the Sun so its lifetime will be 25/100000 = 0.00025 times than the Sun’s lifetime = 2.5 million years. ...
ASTRONOMY 130
... Turn to face the south or southeastern part of the sky. You should find three bright stars that form the apexes of a large equilateral triangle. The star to the right is Betelgeuse (in Orion), the one to the left is Procyon (in Canis Minor), and the one farthest south is Sirius (in Canis Major). The ...
... Turn to face the south or southeastern part of the sky. You should find three bright stars that form the apexes of a large equilateral triangle. The star to the right is Betelgeuse (in Orion), the one to the left is Procyon (in Canis Minor), and the one farthest south is Sirius (in Canis Major). The ...
27.1: Characteristics of Stars
... About 3 billion can be seen through ground-based telescopes Over 1 trillion can be observed from the Hubble Space Telescope The visibility of a star depends on its brightness and its distance from the Earth. Astronomers use two scales to describe the brightness of a star: apparent magnitude and abso ...
... About 3 billion can be seen through ground-based telescopes Over 1 trillion can be observed from the Hubble Space Telescope The visibility of a star depends on its brightness and its distance from the Earth. Astronomers use two scales to describe the brightness of a star: apparent magnitude and abso ...
W > 1 - The Open University
... NGC1952 (M1)(8.5) - snr - "The Crab Nebula". One of the most studied astronomical objects in recent decades. A "new star" appeared in 1054 and over a few months faded from view. Centuries later the faint oval patch was discovered by Dr John Bevis in 1731 and independently by Charles Messier on 12th ...
... NGC1952 (M1)(8.5) - snr - "The Crab Nebula". One of the most studied astronomical objects in recent decades. A "new star" appeared in 1054 and over a few months faded from view. Centuries later the faint oval patch was discovered by Dr John Bevis in 1731 and independently by Charles Messier on 12th ...
b. false - UW Canvas
... d. All of these answers are correct. ©2014 W. W. Norton & Company, Inc. ...
... d. All of these answers are correct. ©2014 W. W. Norton & Company, Inc. ...
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.