RED GIANTS
... Missing the Main Sequence • If the protostar has a mass < 0.08 M: – It does not contain enough gravitational energy to reach a core temperature of 107 K – No fusion reactions occur – The star is stillborn! ...
... Missing the Main Sequence • If the protostar has a mass < 0.08 M: – It does not contain enough gravitational energy to reach a core temperature of 107 K – No fusion reactions occur – The star is stillborn! ...
The Evening Sky Map
... Conjunction – An alignment of two celestial bodies such that they present the least angular separation as viewed from Earth. Constellation – A defined area of the sky containing a star pattern. Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to ...
... Conjunction – An alignment of two celestial bodies such that they present the least angular separation as viewed from Earth. Constellation – A defined area of the sky containing a star pattern. Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to ...
4. Survey Observations
... earlier for the same star to be on your meridian – each month, you must observe 2 hours earlier for the same star to be on you meridian (a given RA is on your meridian 2 hours earlier each month) • Thus, the airmass of a star changes through the year as the star becomes easier or harder to observe • ...
... earlier for the same star to be on your meridian – each month, you must observe 2 hours earlier for the same star to be on you meridian (a given RA is on your meridian 2 hours earlier each month) • Thus, the airmass of a star changes through the year as the star becomes easier or harder to observe • ...
Aging nearby spiral galaxies using H
... »Big Bang cosmology forms H, He in early universe »All heavier elements formed in starsmetals Negligible change over model lifetime (Leitherer 97) »Metals returned to ISM by supernovae · Few SNe within 50Myr · Only returned to local region ...
... »Big Bang cosmology forms H, He in early universe »All heavier elements formed in starsmetals Negligible change over model lifetime (Leitherer 97) »Metals returned to ISM by supernovae · Few SNe within 50Myr · Only returned to local region ...
CO 2 Cycle
... – Where are the hot stars in the HR diagram? – Where are the big stars? – Where are the bright (high luminosity) stars? ...
... – Where are the hot stars in the HR diagram? – Where are the big stars? – Where are the bright (high luminosity) stars? ...
Constellation Catalog
... The Perseus constellation is a northern hemisphere constellation that is best visible at 9 P.M. during the month of December. It is located in the Western sky between the latitudes +90o and -35o. The best way to spot the constellation would be to look for its brightest star, Mirfak. Perseus is borde ...
... The Perseus constellation is a northern hemisphere constellation that is best visible at 9 P.M. during the month of December. It is located in the Western sky between the latitudes +90o and -35o. The best way to spot the constellation would be to look for its brightest star, Mirfak. Perseus is borde ...
solution - Evergreen Archives
... center of the star. Contraction of a star continues slowly throughout its lifetime. Nuclear fusion begins as the temperature rises and this generates additional heat that produces an increase in internal gas pressure. 5. A certain star is seen to have a relatively low surface temperature but a very ...
... center of the star. Contraction of a star continues slowly throughout its lifetime. Nuclear fusion begins as the temperature rises and this generates additional heat that produces an increase in internal gas pressure. 5. A certain star is seen to have a relatively low surface temperature but a very ...
PS#3
... Lsun is 4x1026 W, so this is about 0.001 times the Sun’s luminosity 4. A radio transmitter on a spacecraft emits a signal at a frequency of 10 Hz. At Earth the signal is received and noted to be at 99,970,000Hz. How fast is the spacecraft moving? Is it receding or approaching? ...
... Lsun is 4x1026 W, so this is about 0.001 times the Sun’s luminosity 4. A radio transmitter on a spacecraft emits a signal at a frequency of 10 Hz. At Earth the signal is received and noted to be at 99,970,000Hz. How fast is the spacecraft moving? Is it receding or approaching? ...
Lecture 15 (pdf from the powerpoint)
... Space Telescope reveals The Cat's Eye Nebula to be one of the most complex planetary nebulae known. In fact, the features seen in the Cat's Eye are so complex that astronomers suspect the bright central object may actually be a binary star system. ...
... Space Telescope reveals The Cat's Eye Nebula to be one of the most complex planetary nebulae known. In fact, the features seen in the Cat's Eye are so complex that astronomers suspect the bright central object may actually be a binary star system. ...
Unit H557/02 - Advance Notice Article - June 2017
... but this is not appropriate here. We shall deal only with absolute brightness and apparent brightness. ...
... but this is not appropriate here. We shall deal only with absolute brightness and apparent brightness. ...
GEARS Workshop Monday - Georgia Southern University
... camera radius (from geometry and knowing distance) to get temperature of the sun as blackbody • We used Wien’s Law model for peak wavelength of blackbody emitter using the temperature ...
... camera radius (from geometry and knowing distance) to get temperature of the sun as blackbody • We used Wien’s Law model for peak wavelength of blackbody emitter using the temperature ...
Observing Orion
... The Great Hunter. Orion boasted that no animal could defeat him and he boasted that so great was his might and skill as a hunter that he could kill all the animals on the face of the Earth. Gaea, Goddess of Earth, was alarmed at such an unecological and inappropriate statement. She decided that Orio ...
... The Great Hunter. Orion boasted that no animal could defeat him and he boasted that so great was his might and skill as a hunter that he could kill all the animals on the face of the Earth. Gaea, Goddess of Earth, was alarmed at such an unecological and inappropriate statement. She decided that Orio ...
Teacher Guide Lives of Stars
... 112.33(c)-11C: evaluate the relationship between mass and fusion on the dying process and properties of stars. 112.33(c)-11D: differentiate among the end states of stars, including white dwarfs, neutron stars, and black holes. 112.33(c)-11E: compare how the mass and gravity of a main sequence star w ...
... 112.33(c)-11C: evaluate the relationship between mass and fusion on the dying process and properties of stars. 112.33(c)-11D: differentiate among the end states of stars, including white dwarfs, neutron stars, and black holes. 112.33(c)-11E: compare how the mass and gravity of a main sequence star w ...
Life Cycle of Stars
... Binary star systems are very important references for astronomers: Their orbits allow to determine their masses, which again allows to calculate radius and density. Resulting massluminosity relationship (MLR) can be applied for single stars. ...
... Binary star systems are very important references for astronomers: Their orbits allow to determine their masses, which again allows to calculate radius and density. Resulting massluminosity relationship (MLR) can be applied for single stars. ...
The Fate of Massive Stars
... Diagonal upper-luminosity cutoff that is temperature dependent Hotter --> Higher Luminosity cutoff Greater mass-loss/stellar winds for cooler stars at lower luminosities Stellar winds important contribution to ISM Massive Stars ability to quench star formation Massive stars rare (1 in 1,000,000) but ...
... Diagonal upper-luminosity cutoff that is temperature dependent Hotter --> Higher Luminosity cutoff Greater mass-loss/stellar winds for cooler stars at lower luminosities Stellar winds important contribution to ISM Massive Stars ability to quench star formation Massive stars rare (1 in 1,000,000) but ...
What is a T Tauri star?
... • Probe outer regions of polar jets • Doppler broadened ->high speeds • Blueshifted (red part partially hidden) ...
... • Probe outer regions of polar jets • Doppler broadened ->high speeds • Blueshifted (red part partially hidden) ...
A Summary of Stages
... outward luminosity and inward gravity. Our star has reached the Zero Age Main Sequence, where it will stay for over 90% of its life, virtually unchanged externally. [Note : Stars of different masses experience similar evolutionary tracks on the H-R Diagram, but end up at different points on the ZAMS ...
... outward luminosity and inward gravity. Our star has reached the Zero Age Main Sequence, where it will stay for over 90% of its life, virtually unchanged externally. [Note : Stars of different masses experience similar evolutionary tracks on the H-R Diagram, but end up at different points on the ZAMS ...
Let f (x) = log x , Let f (x) = loga x , x>0 . (a) Write down the value of (i
... Answer: ________!! ...
... Answer: ________!! ...
The Naked Eye Era
... career to astrometry—the precise measurement of star positions. Tycho was inspired by two celestial events early in his career; the appearance of bright new star in 1572, and of a comet in 1577. Aristotle’s view that the stars and the constellations were forever unchanging still held sway in Tycho’s ...
... career to astrometry—the precise measurement of star positions. Tycho was inspired by two celestial events early in his career; the appearance of bright new star in 1572, and of a comet in 1577. Aristotle’s view that the stars and the constellations were forever unchanging still held sway in Tycho’s ...
Let f (x) = log x , Let f (x) = loga x , x>0 . (a) Write down the value of (i
... Answer: ________!! ...
... Answer: ________!! ...
Lecture 12
... An H-R diagram for the 5000 stars with the best distance determinations from Hipparcos: `Observational’ axes: color and absolute magnitude Colors indicate the density of stars in that part of the diagram Most important point: most of the possible combinations of L and Te are not populated by real st ...
... An H-R diagram for the 5000 stars with the best distance determinations from Hipparcos: `Observational’ axes: color and absolute magnitude Colors indicate the density of stars in that part of the diagram Most important point: most of the possible combinations of L and Te are not populated by real st ...
answers2006_07_BC
... near-uniformity over the whole sky this is surprising because different “sides” of the sky should never have exchanged photons, and therefore do not know each other’s temperature – it is one of the key pieces of evidence for inflation very small temperature fluctuations (1 in 100000) by studying the ...
... near-uniformity over the whole sky this is surprising because different “sides” of the sky should never have exchanged photons, and therefore do not know each other’s temperature – it is one of the key pieces of evidence for inflation very small temperature fluctuations (1 in 100000) by studying the ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.