PSU/TCfA search for planets around evolved stars
... moderate intensity, which were located close to the center of Echelle orders: Cr I 663.003 nm, Ni I 664.638 nm, Ca I 671.77 nm, Fe I 675.02 nm, and Ni I 676.784 nm. All these lines show well defined bisectors. The changes in the spectral line bisector were quantified using the bisector velocity span ...
... moderate intensity, which were located close to the center of Echelle orders: Cr I 663.003 nm, Ni I 664.638 nm, Ca I 671.77 nm, Fe I 675.02 nm, and Ni I 676.784 nm. All these lines show well defined bisectors. The changes in the spectral line bisector were quantified using the bisector velocity span ...
Twitter Feed ITSO Symposium 2017
... process? Spectroscopy of sources during reionisation can provide insights into this period, by setting constraints on the evolution of the neutral gas fraction with redshift, and on the topology of hydrogen reionisation. As they are extremely faint and their spectra are highly redshifted to near-inf ...
... process? Spectroscopy of sources during reionisation can provide insights into this period, by setting constraints on the evolution of the neutral gas fraction with redshift, and on the topology of hydrogen reionisation. As they are extremely faint and their spectra are highly redshifted to near-inf ...
Absolute Magnitudes of Turnoff Stars in Globular Clusters Palomar
... All of the stars begin on the main sequence of the HR diagram and the energy that makes them shine comes from fusion of hydrogen into helium. Although the more massive stars have more hydrogen fuel to burn, they are so much hotter and brighter than less massive stars that they run out of fuel more q ...
... All of the stars begin on the main sequence of the HR diagram and the energy that makes them shine comes from fusion of hydrogen into helium. Although the more massive stars have more hydrogen fuel to burn, they are so much hotter and brighter than less massive stars that they run out of fuel more q ...
Parallax and Aberration - Berry College Professional WordPress Sites
... construct plots of the apparent declination of Gamma Draconis and Alkaid, using Bradley’s theory of stellar aberration, as shown in Fig. 5. A comparison with Fig. 4 shows that the pattern predicted by Bradley’s theory fits his observational data. Bradley’s data indicate a displacement of 20.2 second ...
... construct plots of the apparent declination of Gamma Draconis and Alkaid, using Bradley’s theory of stellar aberration, as shown in Fig. 5. A comparison with Fig. 4 shows that the pattern predicted by Bradley’s theory fits his observational data. Bradley’s data indicate a displacement of 20.2 second ...
The Milky Way Galaxy
... hot to be retained by the gravity of the visible matter in a cluster. If all the mass there really were only that of visible matter, its gravity would not be enough to retain the hot gas, which would evaporate rapidly. Since the gas is there, there must be more gravity, hence dark matter. ...
... hot to be retained by the gravity of the visible matter in a cluster. If all the mass there really were only that of visible matter, its gravity would not be enough to retain the hot gas, which would evaporate rapidly. Since the gas is there, there must be more gravity, hence dark matter. ...
Powerpoint Review
... one year. So if an object is one light year away, it will take light one year to get there. 1 light year = 9,461,000,000,000 km or 5,879,000,000,000 miles Light years are used to measure distances in space because their large size allows us to talk about vast distances using smaller numbers. For ins ...
... one year. So if an object is one light year away, it will take light one year to get there. 1 light year = 9,461,000,000,000 km or 5,879,000,000,000 miles Light years are used to measure distances in space because their large size allows us to talk about vast distances using smaller numbers. For ins ...
public_lector_10
... Lindblad interpreted the pattern of stellar motions as due to Galactic rotation ...
... Lindblad interpreted the pattern of stellar motions as due to Galactic rotation ...
Hertzsprung-Russell Diagram Outline
... From a star’s spectrum, we can determine its spectral and luminosity class. Given the star’s apparent brightness (observed flux), we can then estimate its distance. This distance determination technique is called spectroscopic parallax Example: Observe a G2 Ia star (supergiant) with ...
... From a star’s spectrum, we can determine its spectral and luminosity class. Given the star’s apparent brightness (observed flux), we can then estimate its distance. This distance determination technique is called spectroscopic parallax Example: Observe a G2 Ia star (supergiant) with ...
2014 State Test
... D6. (2 pts) The measured parallax of this star is 1.26 milliarcseconds. What is the distance to this star in parsecs? Give your answer to three significant figures. D7. (2 pts) What is the distance modulus associated with the distance you calculated in D6? If you didn’t get an answer to D6 or don’t ...
... D6. (2 pts) The measured parallax of this star is 1.26 milliarcseconds. What is the distance to this star in parsecs? Give your answer to three significant figures. D7. (2 pts) What is the distance modulus associated with the distance you calculated in D6? If you didn’t get an answer to D6 or don’t ...
Red Giants - Faculty Web Pages
... Assignment #11 – Red Giants As we discussed in class, the brightest stars in the sky are not the same as the nearest stars in the sky. Those two groups are not the same! The nearby stars in the sky are mostly dim Type-M stars. The bright stars in the sky, on the other hand, tend to be Type O, B or A ...
... Assignment #11 – Red Giants As we discussed in class, the brightest stars in the sky are not the same as the nearest stars in the sky. Those two groups are not the same! The nearby stars in the sky are mostly dim Type-M stars. The bright stars in the sky, on the other hand, tend to be Type O, B or A ...
Variable star information
... periodic manner. These pulsations translate into a periodic variation of the light they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the observed brightness of an extrinsic variable star are either due to some process that ...
... periodic manner. These pulsations translate into a periodic variation of the light they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the observed brightness of an extrinsic variable star are either due to some process that ...
L103 A NEW MILKY WAY DWARF SATELLITE IN CANES
... of the Milky Way. Together with the two dwarf irregulars (the Large and Small Magellanic Clouds), these make up all the known satellite galaxies of the Milky Way. The dSphs have such low surface brightness that they have often been found serendipitously. For example, while Sextans (Irwin et al. 1990 ...
... of the Milky Way. Together with the two dwarf irregulars (the Large and Small Magellanic Clouds), these make up all the known satellite galaxies of the Milky Way. The dSphs have such low surface brightness that they have often been found serendipitously. For example, while Sextans (Irwin et al. 1990 ...
transparencies - Rencontres de Blois
... Phase space constraints– will collect in clusters, not in galaxies. ...
... Phase space constraints– will collect in clusters, not in galaxies. ...
Star formation in galaxies over the last 10 billion
... Luminous matter, formation of gas disk and stars: Luminous matter (gas!) is viscous, and heated as it falls into dark matter halos; then heat is radiated away gas cools - contracts angular momentum is conserved >spin-up of rotation (“figure skater”) fast rotating disk energy in turbulent/random mot ...
... Luminous matter, formation of gas disk and stars: Luminous matter (gas!) is viscous, and heated as it falls into dark matter halos; then heat is radiated away gas cools - contracts angular momentum is conserved >spin-up of rotation (“figure skater”) fast rotating disk energy in turbulent/random mot ...
Milky Way Galaxy Webquest
... 19. What is meant by dark matter? Why do astronomers conclude that the Milky Way contains dark ...
... 19. What is meant by dark matter? Why do astronomers conclude that the Milky Way contains dark ...
12 The Milky Way - Journigan-wiki
... from interstellar gas caught between the spiral arms of galaxies. The strong gravitational fields compress the gas creating stars that are gravitationally bound together. These clusters eventually break apart. Approximately 20,000 star clusters are believed to exist in the Milky Way. Our own Sun may ...
... from interstellar gas caught between the spiral arms of galaxies. The strong gravitational fields compress the gas creating stars that are gravitationally bound together. These clusters eventually break apart. Approximately 20,000 star clusters are believed to exist in the Milky Way. Our own Sun may ...
Distance to VY Canis Majoris with VERA
... (Kovalev et al. 2007). Because these offsets are constant at all epochs, it dose not affect the parallax measurements. Also, when the reference source is not a point source, the positional errors of the target source could occur due to the structure and its variation of the reference source. However ...
... (Kovalev et al. 2007). Because these offsets are constant at all epochs, it dose not affect the parallax measurements. Also, when the reference source is not a point source, the positional errors of the target source could occur due to the structure and its variation of the reference source. However ...
A Catalog of Blue Stragglers in Open Clusters
... Quality of the color-magnitude and color-color diagrams ...
... Quality of the color-magnitude and color-color diagrams ...
The Nature of Light
... 1.5x1011m). (a) how long does it take the light to travel from the Sun to an observer on the Earth? (b) A concord airplane has a speed of 600 m/s; how long does it take a traveler on a Concord airplane to travel from the Earth to the Sun? Ex.2: A lunar laser ranging retro-reflector array was planted ...
... 1.5x1011m). (a) how long does it take the light to travel from the Sun to an observer on the Earth? (b) A concord airplane has a speed of 600 m/s; how long does it take a traveler on a Concord airplane to travel from the Earth to the Sun? Ex.2: A lunar laser ranging retro-reflector array was planted ...
17_LectureOutline
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
A method for determining the V magnitude of asteroids from CCD
... equally and can thus be ignored. However, deriving asteroid magnitudes in this way is problematic in that comparison stars with known accurate magnitudes are few and far between, and it is unusual to find many, if any, such stars on a typical random CCD image. So to obtain an accurate measure of the ...
... equally and can thus be ignored. However, deriving asteroid magnitudes in this way is problematic in that comparison stars with known accurate magnitudes are few and far between, and it is unusual to find many, if any, such stars on a typical random CCD image. So to obtain an accurate measure of the ...
Proper Motion of a Star
... angular velocity is small enough that measurements must be made from photographs taken many years apart. The negatives of Barnard’s Star provided in this lab were taken in 1924 and 1951 respectively. Since proper motion is an angular velocity, we also need to know the star’s distance to find its rea ...
... angular velocity is small enough that measurements must be made from photographs taken many years apart. The negatives of Barnard’s Star provided in this lab were taken in 1924 and 1951 respectively. Since proper motion is an angular velocity, we also need to know the star’s distance to find its rea ...
Distance determination for RAVE stars using stellar models
... and the Sagittarius stream (Majewski et al., 2003). However, we might also be able to detect already merged galaxies using the kinematics of stars in the Milky Way (Helmi et al., 2006). From numerical simulations we have learnt that stars from a common progenitor, when merged with the Milky Way, mov ...
... and the Sagittarius stream (Majewski et al., 2003). However, we might also be able to detect already merged galaxies using the kinematics of stars in the Milky Way (Helmi et al., 2006). From numerical simulations we have learnt that stars from a common progenitor, when merged with the Milky Way, mov ...
Log Scale Notes
... water. The greater the concentration of H3 O+ , the greater the acidity. For pure water, the Hydrogen ion concentration is 1.0 × 10−7 mol(H3 O+ )/liter or about 1.0 × 10−7 × 6.022 × 1023 = 6.022 × 1016 molecules of H3 O+ per liter. For stomach acid the pH is about 1.0 × 10−2 and for Alka SeltzerTM i ...
... water. The greater the concentration of H3 O+ , the greater the acidity. For pure water, the Hydrogen ion concentration is 1.0 × 10−7 mol(H3 O+ )/liter or about 1.0 × 10−7 × 6.022 × 1023 = 6.022 × 1016 molecules of H3 O+ per liter. For stomach acid the pH is about 1.0 × 10−2 and for Alka SeltzerTM i ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.