Final Exam, Dec. 19, 2015 - Physics@Brock
... (d) [None of the above.] 5. The spectroscopic parallax is a method of determining (a) a star’s chemical composition. (b) a star’s temperature. (c) a star’s distance from parallax angle. (d) a star’s distance using H-R diagram. 6. Which of these main sequence stars will have the shortest lifetime? (a ...
... (d) [None of the above.] 5. The spectroscopic parallax is a method of determining (a) a star’s chemical composition. (b) a star’s temperature. (c) a star’s distance from parallax angle. (d) a star’s distance using H-R diagram. 6. Which of these main sequence stars will have the shortest lifetime? (a ...
The Night Sky September 2016 - Bridgend Astronomical Society
... Lyra is dominated by its brightest star Vega, the fifth brightest star in the sky. It is a blue-white star having a magnitude of 0.03, and lies 26 light years away. It weighs three times more than the Sun and is about 50 times brighter. It is thus burning up its nuclear fuel at a greater rate than t ...
... Lyra is dominated by its brightest star Vega, the fifth brightest star in the sky. It is a blue-white star having a magnitude of 0.03, and lies 26 light years away. It weighs three times more than the Sun and is about 50 times brighter. It is thus burning up its nuclear fuel at a greater rate than t ...
Document
... Likely that most of the stellar mass has been processed through the disk. B fields may have been important. ...
... Likely that most of the stellar mass has been processed through the disk. B fields may have been important. ...
Cooling of Compact Stars
... The mass of the millisecond pulsar PSR J1614-2230 to be M = 1.97 ± 0.04 M⊙. This value, together with the mass of pulsar J1903+0327 of M = 1.667 ± 0.021 M⊙ due to the prolonged accretion episode that is thought to be required to form a MSP. ...
... The mass of the millisecond pulsar PSR J1614-2230 to be M = 1.97 ± 0.04 M⊙. This value, together with the mass of pulsar J1903+0327 of M = 1.667 ± 0.021 M⊙ due to the prolonged accretion episode that is thought to be required to form a MSP. ...
12-1 MAIN-SEQUENCE STARS
... called compact objects, along with neutron stars and black holes. A white dwarf cannot support its own weight by its degenerate pressure if its mass is greater than the Chandrasekhar limit of 1.4 solar masses. Medium-mass stars up to about 8 solar masses can lose enough mass to die as white dwarfs. ...
... called compact objects, along with neutron stars and black holes. A white dwarf cannot support its own weight by its degenerate pressure if its mass is greater than the Chandrasekhar limit of 1.4 solar masses. Medium-mass stars up to about 8 solar masses can lose enough mass to die as white dwarfs. ...
Structure of Neutron Stars - Relativistic Astrophysics Department
... The closest millisecond PSR. MNS=1.76+/-0.2 solar. Hopefully, this value will not be reconsidered. 2. The case of PSR J0751+1807. Initially, it was announced that it has a mass ~2.1 solar [astro-ph/0508050]. However, then in 2007 at a conference the authors announced that the result was incorrect. A ...
... The closest millisecond PSR. MNS=1.76+/-0.2 solar. Hopefully, this value will not be reconsidered. 2. The case of PSR J0751+1807. Initially, it was announced that it has a mass ~2.1 solar [astro-ph/0508050]. However, then in 2007 at a conference the authors announced that the result was incorrect. A ...
Luminosity and brightness
... Luminosity is a measure of the total energy given output by a star at all wavelengths form gamma radiation to radio waves. For example the Sun gives out about 500 million million million MJ of energy every second so its luminosity is 500 million million million MJ. The luminosity depends on: (a) the ...
... Luminosity is a measure of the total energy given output by a star at all wavelengths form gamma radiation to radio waves. For example the Sun gives out about 500 million million million MJ of energy every second so its luminosity is 500 million million million MJ. The luminosity depends on: (a) the ...
Emission and Absorption Spectra
... • Not exactly the same as interstellar dust, but also more effective at scattering blue than red – During daytime, only relatively short path of light through atmosphere: only blue wavelengths are scattered ...
... • Not exactly the same as interstellar dust, but also more effective at scattering blue than red – During daytime, only relatively short path of light through atmosphere: only blue wavelengths are scattered ...
Star evolution - El Camino College
... • What kind of pressure resists gravity? – _______________________pressure ...
... • What kind of pressure resists gravity? – _______________________pressure ...
SUMSS - 京都大学
... light, because gravity is so strong. First postulated in 1783 by English geologist John Michell, term “black hole” coined in 1969. ...
... light, because gravity is so strong. First postulated in 1783 by English geologist John Michell, term “black hole” coined in 1969. ...
Sirius Astronomer - Orange County Astronomers
... HST has also come up with a new class of planet, a waterworld surrounded by a thick, steamy atmosphere. The planet is known as GJ1214b, and was discovered in 2009. Observations soon after showed that it has an atmosphere of water vapor. New HST observations in infrared showed that the whole atmosphe ...
... HST has also come up with a new class of planet, a waterworld surrounded by a thick, steamy atmosphere. The planet is known as GJ1214b, and was discovered in 2009. Observations soon after showed that it has an atmosphere of water vapor. New HST observations in infrared showed that the whole atmosphe ...
1st EXAM VERSION C - Department of Physics and Astronomy
... 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 in the sp ...
... 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 in the sp ...
Time From the Perspective of a Particle Physicist
... • acquire mass, if becomes > 1.4 M(Sun) SUPERNOVA (Ia). p + e n + neutrino • Usually leaves neutron star For high mass stars • fusion continues beyond C,O to Iron • if Mass(core) > 1.4 M(Sun) core collapses in SUPERNOVA (II) • leaves either Neutron Star or Black Hole • Most SN are this type PHYS 1 ...
... • acquire mass, if becomes > 1.4 M(Sun) SUPERNOVA (Ia). p + e n + neutrino • Usually leaves neutron star For high mass stars • fusion continues beyond C,O to Iron • if Mass(core) > 1.4 M(Sun) core collapses in SUPERNOVA (II) • leaves either Neutron Star or Black Hole • Most SN are this type PHYS 1 ...
The Mass-Radius Relation for Polytropes The mass within any point
... substitute in the equation of state for a completely relativistic electron gas (K = 1.2435 × 1015 µ−4/3 cgs) into (16.1.2), and do the math, the total mass of the star becomes MCh = ...
... substitute in the equation of state for a completely relativistic electron gas (K = 1.2435 × 1015 µ−4/3 cgs) into (16.1.2), and do the math, the total mass of the star becomes MCh = ...
The Nature of γ-ray Source 3EG J2020+4017
... • 3. spectral analysis: ( energy range from 0.5 to 8.0 keV) a. absorbed power law => spectral index= 8.2 ﹗ b. blackbody c. MEKAL spectrum =>S312 is a K0V star ...
... • 3. spectral analysis: ( energy range from 0.5 to 8.0 keV) a. absorbed power law => spectral index= 8.2 ﹗ b. blackbody c. MEKAL spectrum =>S312 is a K0V star ...
Gamma-Ray-Bursts in Nuclear Astrophysics Giuseppe Pagliara
... with a companion, etc. • The viscous accretion onto the BH strong heating thermal nñ annihilating preferentially around the axis . ...
... with a companion, etc. • The viscous accretion onto the BH strong heating thermal nñ annihilating preferentially around the axis . ...
Unit 9E.1 The Life Cycle of Stars17213
... boost star production, say the researchers. Stars form from clouds of gas. Most black holes, however, heat up their neighborhoods to such high temperatures that nearby gas clouds can’t cool enough to stick together and form stars. That’s not the case with Phoenix: Its black hole isn’t superhot. Mayb ...
... boost star production, say the researchers. Stars form from clouds of gas. Most black holes, however, heat up their neighborhoods to such high temperatures that nearby gas clouds can’t cool enough to stick together and form stars. That’s not the case with Phoenix: Its black hole isn’t superhot. Mayb ...
The Gas Disk Stellar halo Bulge (= bar) Disk
... Molecular clouds are in the disk and are associated with dust. Optical (lII = +/- 90o) ...
... Molecular clouds are in the disk and are associated with dust. Optical (lII = +/- 90o) ...
The 22 First Magnitude Stars
... Motion of the Earth • Rotation: once around the N/S polar axis every 24 hours • Revolution about the Sun: once every 365.25 days • Precession (wobbling of polar axis): in 47º circle once every 25,800 years • Nutation (a shorter period wobbling): not very significant to us ...
... Motion of the Earth • Rotation: once around the N/S polar axis every 24 hours • Revolution about the Sun: once every 365.25 days • Precession (wobbling of polar axis): in 47º circle once every 25,800 years • Nutation (a shorter period wobbling): not very significant to us ...
GEARS Workshop Monday - Georgia Southern University
... powered it has only just shut down. This star, the hottest known white dwarf, H1504+65, seems to have been stripped of its entire outer regions during its death throes leaving behind the core that formed its power plant. The Chandra X-ray data also reveal the signatures of neon, an expected by-produ ...
... powered it has only just shut down. This star, the hottest known white dwarf, H1504+65, seems to have been stripped of its entire outer regions during its death throes leaving behind the core that formed its power plant. The Chandra X-ray data also reveal the signatures of neon, an expected by-produ ...
Powerpoint for today
... stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are forming too, but make few UV photons. Why "H II Region? H I: Hydrogen atom H II: Ionized Hyd ...
... stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are forming too, but make few UV photons. Why "H II Region? H I: Hydrogen atom H II: Ionized Hyd ...
HEA_Pulsars_2002
... - inner ~ 1018 kg m-3 = 1015g cm-3 - M ~ 0.2 - 3.2 solar masses - surface gravity ~ 1012 m s-2 • We are going to find magnetic induction, B, of a neutron star. ...
... - inner ~ 1018 kg m-3 = 1015g cm-3 - M ~ 0.2 - 3.2 solar masses - surface gravity ~ 1012 m s-2 • We are going to find magnetic induction, B, of a neutron star. ...
Laboratory Title
... read aloud Step 1 directions from the index card and carrying out the directions. The student with the red balloon goes next, in turn reading the directions for step 1 and following the directions. Students with the white and blue balloons follow. Then the procedure continues going on to Step 2, and ...
... read aloud Step 1 directions from the index card and carrying out the directions. The student with the red balloon goes next, in turn reading the directions for step 1 and following the directions. Students with the white and blue balloons follow. Then the procedure continues going on to Step 2, and ...
Astronomy (C) - North Carolina Science Olympiad
... 2 kinds: apparent magnitude and absolute magnitude Apparent magnitude: how bright star appears from Earth (depends on distance and type of star) Lower number means brighter star (i.e. magnitude 1 brighter than magnitude 6) Absolute magnitude: how bright star would be at 10 parsecs from Earth ...
... 2 kinds: apparent magnitude and absolute magnitude Apparent magnitude: how bright star appears from Earth (depends on distance and type of star) Lower number means brighter star (i.e. magnitude 1 brighter than magnitude 6) Absolute magnitude: how bright star would be at 10 parsecs from Earth ...
The life-cycle of stars - Young Scientists Journal
... force between the nuclei overcomes gravity and the core recoils out in what we see as a supernova. As the shock wave hits material in the star’s outer layers the material is heated, fusing to form further elements. All heavy elements, including uranium and plutonium, are formed in supernovae. The ma ...
... force between the nuclei overcomes gravity and the core recoils out in what we see as a supernova. As the shock wave hits material in the star’s outer layers the material is heated, fusing to form further elements. All heavy elements, including uranium and plutonium, are formed in supernovae. The ma ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.