Full Press Release - The Open University
... the image have swept out the gas and dust to the periphery of the nebula, creating a hollow shell-like structure. The gas that has been swept out creates the bright filament-like structures seen in the surrounding regions. The dust in the gas is heated by the intense light coming from both the mass ...
... the image have swept out the gas and dust to the periphery of the nebula, creating a hollow shell-like structure. The gas that has been swept out creates the bright filament-like structures seen in the surrounding regions. The dust in the gas is heated by the intense light coming from both the mass ...
AN INTRODUCTION TO ASTRONOMY Dr. Uri Griv Department of Physics, Ben-Gurion University
... The Apparent Stellar Magnitude • The responce of the human eye works on the basis of a geometric progression rather than an arithmetic progression • The modern magnitude classification: a difference of 5 magnitudes to equal exactly a factor of 100 in apparent brightness • If m1 and m2 are the appar ...
... The Apparent Stellar Magnitude • The responce of the human eye works on the basis of a geometric progression rather than an arithmetic progression • The modern magnitude classification: a difference of 5 magnitudes to equal exactly a factor of 100 in apparent brightness • If m1 and m2 are the appar ...
planetary nebulae
... With no fusion energy to keep the core inflated, it collapses for one last time. The carbon is crushed into a diamond the size of the Earth. The outer layers of the Red Giant are shed into space as giant gas and dust shells. They are illuminated by the remaining tiny White Dwarf star. ...
... With no fusion energy to keep the core inflated, it collapses for one last time. The carbon is crushed into a diamond the size of the Earth. The outer layers of the Red Giant are shed into space as giant gas and dust shells. They are illuminated by the remaining tiny White Dwarf star. ...
Exoplanets for Amateur Astronomers
... days). However, first planet found (51 Pegasi b) had a orbital period of 4 days!!! • Current equipment can measure deviations down to 1-2 m/s. For point of reference, Jupiter causes deviation of 12 m/s and the Earth .09 m/s. This makes Radial Velocity not ideal for finding Earth sized objects. ...
... days). However, first planet found (51 Pegasi b) had a orbital period of 4 days!!! • Current equipment can measure deviations down to 1-2 m/s. For point of reference, Jupiter causes deviation of 12 m/s and the Earth .09 m/s. This makes Radial Velocity not ideal for finding Earth sized objects. ...
Test 1, Feb. 2, 2016 - Brock physics
... 42. In order to detect a black hole one looks for (a) a spot into which stars and their planets fall. (b) a binary system where a companion star is not visible but has a mass greater than 3 solar masses and is an intense X-ray source. (c) intense source of visible light. (d) the accompanying white h ...
... 42. In order to detect a black hole one looks for (a) a spot into which stars and their planets fall. (b) a binary system where a companion star is not visible but has a mass greater than 3 solar masses and is an intense X-ray source. (c) intense source of visible light. (d) the accompanying white h ...
OUR UNIVERSE Problem Set 7 Solutions Question A1 Question A2
... The high luminosity means that the star is large which gives rise to high densities in the cores of these stars, and high temperature means the nuclei are moving very fast [1]. These two factors combine to give a very high rate of collisions of nuclei in the cores which means that they burn up their ...
... The high luminosity means that the star is large which gives rise to high densities in the cores of these stars, and high temperature means the nuclei are moving very fast [1]. These two factors combine to give a very high rate of collisions of nuclei in the cores which means that they burn up their ...
1st EXAM VERSION C - Department of Physics and Astronomy
... motion. B. a star that is periodically eclipsed by the Moon. C. *two stars whose combined light output when measured from Earth appears to vary periodically as the two stars move in front of one another. D. two stars that are clearly seen as separate but associated in the sky. 25. Absorption lines i ...
... motion. B. a star that is periodically eclipsed by the Moon. C. *two stars whose combined light output when measured from Earth appears to vary periodically as the two stars move in front of one another. D. two stars that are clearly seen as separate but associated in the sky. 25. Absorption lines i ...
ASTR100 Class 01 - University of Maryland Department of
... Globular cluster: Up to a million or more stars in a dense ball bound together by gravity. ...
... Globular cluster: Up to a million or more stars in a dense ball bound together by gravity. ...
Star Formation: Interstellar Gas and Dust
... • Degenerate pressure of neutrons can support stars only up to 3M • For M > 3M: Further collapse Î black hole • Mass is so concentrated that light cannot escape. • One way to think about it: – vescape = 2GM/R becomes greater than speed of light. – So photons can’t escape. • Black holes now known o ...
... • Degenerate pressure of neutrons can support stars only up to 3M • For M > 3M: Further collapse Î black hole • Mass is so concentrated that light cannot escape. • One way to think about it: – vescape = 2GM/R becomes greater than speed of light. – So photons can’t escape. • Black holes now known o ...
Astronomy Assignment #1
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
Astronomy - Scioly.org
... 51. What event marks the end of every star's main sequence life? a. The end of hydrogen fusion in the core. b. The beginning of the CNO cycle. c. The beginning of the triple-alpha process. d. The formation of a planetary nebula. e. Both a and c above 52. Why can't the lowest-mass stars become giant ...
... 51. What event marks the end of every star's main sequence life? a. The end of hydrogen fusion in the core. b. The beginning of the CNO cycle. c. The beginning of the triple-alpha process. d. The formation of a planetary nebula. e. Both a and c above 52. Why can't the lowest-mass stars become giant ...
DTU9ePPTChap13 - Faculty Lounge : Astronomy
... of X rays and radio waves. (a) A radio image produced by the Very Large Array (VLA). (b) A corresponding X-ray picture of Cassiopeia A taken by Chandra. The opposing jets of silicon, probably guided by powerful magnetic fields, were ejected early in the supernova, before the iron-rich jets were rele ...
... of X rays and radio waves. (a) A radio image produced by the Very Large Array (VLA). (b) A corresponding X-ray picture of Cassiopeia A taken by Chandra. The opposing jets of silicon, probably guided by powerful magnetic fields, were ejected early in the supernova, before the iron-rich jets were rele ...
Stars: the Hertzsprung
... • We have been focusing on the properties of stars on the main sequence, but the chemical composition of stars change with time as the star burns hydrogen into helium. • This causes the other properties to change with time and we can track these changes via motion of the star in the HR diagram. ...
... • We have been focusing on the properties of stars on the main sequence, but the chemical composition of stars change with time as the star burns hydrogen into helium. • This causes the other properties to change with time and we can track these changes via motion of the star in the HR diagram. ...
Instructor Notes
... The luminosity of the star increases suddenly by a factor of around 108 during this explosion, producing a supernova ...
... The luminosity of the star increases suddenly by a factor of around 108 during this explosion, producing a supernova ...
Properties of Stars
... Some binaries are too close together to be resolved, you may still be able to detect the binary through the Doppler shift (in one or both stars). They must be relatively close to each other (short orbital period). If you can see both stars’ spectrums, you may be able to use Doppler shifts to measure ...
... Some binaries are too close together to be resolved, you may still be able to detect the binary through the Doppler shift (in one or both stars). They must be relatively close to each other (short orbital period). If you can see both stars’ spectrums, you may be able to use Doppler shifts to measure ...
Leaving the Main Sequence
... it can not support itself under its own weight. So compressed that protons and electrons join to form neutrons. Core shrinks instantaneously. Rest of star falls in, then rebounds off of neutron star or black hole created in core collapse. Rebound is outward explosion. 6. Neutron star or black hole - ...
... it can not support itself under its own weight. So compressed that protons and electrons join to form neutrons. Core shrinks instantaneously. Rest of star falls in, then rebounds off of neutron star or black hole created in core collapse. Rebound is outward explosion. 6. Neutron star or black hole - ...
Study Guide for 3RD Astronomy Exam
... Convert stellar distances between parsecs and light years. Write or identify the definition of the stellar motion term “Proper Motion” Describe or identify types of binary stars. State or identify what additional information can be obtained from and eclipsing binaries besides the combined mass of th ...
... Convert stellar distances between parsecs and light years. Write or identify the definition of the stellar motion term “Proper Motion” Describe or identify types of binary stars. State or identify what additional information can be obtained from and eclipsing binaries besides the combined mass of th ...
Planetary Configurations
... Indirect, since planet not actually observed, only its influence on the star about which it orbits – Astrometry: observe “wobble” motion of star in sky as reflex motion owing to planetary companion – Doppler Shift: observe “wobble” motion as evidenced by spectral line shifts Microlensing: if lens is ...
... Indirect, since planet not actually observed, only its influence on the star about which it orbits – Astrometry: observe “wobble” motion of star in sky as reflex motion owing to planetary companion – Doppler Shift: observe “wobble” motion as evidenced by spectral line shifts Microlensing: if lens is ...
Student Exploration Sheet: Growing Plants
... High atmospheric pressures in a star cause spectral lines to be broadened, or “smeared out.” Giant stars, which have relatively low atmospheric pressures, are characterized by narrow spectral lines. ...
... High atmospheric pressures in a star cause spectral lines to be broadened, or “smeared out.” Giant stars, which have relatively low atmospheric pressures, are characterized by narrow spectral lines. ...
ref H-R Spectral types
... In this Activity we have had a look at the Balmer series, and how its occurrence in the photospheres of stars will vary with temperature. The temperature, and hence the colour and spectral line strength characteristics of stars, is used to classify them into types O, B, A, F, G, K and M-type stars. ...
... In this Activity we have had a look at the Balmer series, and how its occurrence in the photospheres of stars will vary with temperature. The temperature, and hence the colour and spectral line strength characteristics of stars, is used to classify them into types O, B, A, F, G, K and M-type stars. ...
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.