network of amateur astronomers (CBA) to gather data on CV`s.
... OMSI Astronomical Photometry, Spectroscopy and Astrometry Workshop 2010 Double Stars Measurements & Cataclysmic Variables James L. Jones ...
... OMSI Astronomical Photometry, Spectroscopy and Astrometry Workshop 2010 Double Stars Measurements & Cataclysmic Variables James L. Jones ...
The 100-billion-body problem A full-scale computer simulation of the
... Each step should be brief enough that the distance between pairs of stars does not change by more than a few percent. For stars that are many lightyears apart, time steps of several thousand years give acceptable results, but close encounters and tightly bound binary stars can require steps of days ...
... Each step should be brief enough that the distance between pairs of stars does not change by more than a few percent. For stars that are many lightyears apart, time steps of several thousand years give acceptable results, but close encounters and tightly bound binary stars can require steps of days ...
The Milky Way - The Independent School
... Based on rotation curves, use Kepler’s 3rd law to infer ...
... Based on rotation curves, use Kepler’s 3rd law to infer ...
powerpoint
... • If a star passes directly behind a bit of dark matter, it will briefly brighten. • The amount of the brightening will be a reflection of the mass and distance of the dark matter (max lensing when the dark matter is halfway between us and the star). ...
... • If a star passes directly behind a bit of dark matter, it will briefly brighten. • The amount of the brightening will be a reflection of the mass and distance of the dark matter (max lensing when the dark matter is halfway between us and the star). ...
Supernovae March 23 − Supernova 1987A
... expelled by giants • Iron was made in massive stars and expelled by supernovae ...
... expelled by giants • Iron was made in massive stars and expelled by supernovae ...
Local group
... which live 'forever', • massive stars inject into ISM a mass pDMtotal of heavy elements (p depends on the IMF and the yield of SN- normalized to total mass of stars). • Assumptions: galaxies gas is well mixed, no infall or outflow, high mass stars return metals to ISM faster than time to form new st ...
... which live 'forever', • massive stars inject into ISM a mass pDMtotal of heavy elements (p depends on the IMF and the yield of SN- normalized to total mass of stars). • Assumptions: galaxies gas is well mixed, no infall or outflow, high mass stars return metals to ISM faster than time to form new st ...
Why do some galaxies stop making new stars?
... A distinctive feature of elliptical galaxies is their ellipsoidal shapes, much like an Aussie rules or rugby ball. The Milky Way, and many other large star-forming galaxies, are spiral galaxies. In spiral galaxies, ...
... A distinctive feature of elliptical galaxies is their ellipsoidal shapes, much like an Aussie rules or rugby ball. The Milky Way, and many other large star-forming galaxies, are spiral galaxies. In spiral galaxies, ...
ppt file
... Suppose we can only measure the Doppler shifts in the spectrum of one of the stars (example of this situation?) So… measurables are the period P and the line-ofsight velocity amplitude i is the inclination angle at which we are viewing the binary orbit ...
... Suppose we can only measure the Doppler shifts in the spectrum of one of the stars (example of this situation?) So… measurables are the period P and the line-ofsight velocity amplitude i is the inclination angle at which we are viewing the binary orbit ...
I : Importance of binary stars
... Suppose we can only measure the Doppler shifts in the spectrum of one of the stars (example of this situation?) So… measurables are the period P and the line-ofsight velocity amplitude i is the inclination angle at which we are viewing the binary orbit ...
... Suppose we can only measure the Doppler shifts in the spectrum of one of the stars (example of this situation?) So… measurables are the period P and the line-ofsight velocity amplitude i is the inclination angle at which we are viewing the binary orbit ...
The Ultraluminous X-ray Source in Holmberg IX and its Environment
... mass black holes (IMBHs) having 102 to 105 solar masses (Colbert & Mushotzky 1999) or non-isotropic emission beamed into our line-of-sight (King et al. 2001). Here, we are interested in one of these objects, Holmberg IX X-1, located at a distance of 3.6 Mpc in a dwarf galaxy companion of M81. Miller ...
... mass black holes (IMBHs) having 102 to 105 solar masses (Colbert & Mushotzky 1999) or non-isotropic emission beamed into our line-of-sight (King et al. 2001). Here, we are interested in one of these objects, Holmberg IX X-1, located at a distance of 3.6 Mpc in a dwarf galaxy companion of M81. Miller ...
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
... (c) Assuming that the moment of inertia is that of a uniform sphere when the collapse begins, and that the moment inertia is that of a uniform disk when the collapse ends, determine the rotational velocity at 100 AU when the collapse stops. (d) After the collapse has stopped, calculate the time requ ...
... (c) Assuming that the moment of inertia is that of a uniform sphere when the collapse begins, and that the moment inertia is that of a uniform disk when the collapse ends, determine the rotational velocity at 100 AU when the collapse stops. (d) After the collapse has stopped, calculate the time requ ...
Astronomy 114 - Department of Astronomy
... Hipparcos satellite: measured distances 120,000 stars to high accuracy Parallax angles of 0.001 arc sec ...
... Hipparcos satellite: measured distances 120,000 stars to high accuracy Parallax angles of 0.001 arc sec ...
Gone in a flash: supernovae in the survey era
... brighter than a Type Ia supernova). The first of SLSN (Gal-Yam 2012), commonly defined as CFHT, or DECam on the Cerro Tololo Interevent, SCP 06F6, was identified in 2009 and had being brighter than –21 in absolute magnitude American Observatory 4 m Blanco telescope), broad, unexplained spectral abso ...
... brighter than a Type Ia supernova). The first of SLSN (Gal-Yam 2012), commonly defined as CFHT, or DECam on the Cerro Tololo Interevent, SCP 06F6, was identified in 2009 and had being brighter than –21 in absolute magnitude American Observatory 4 m Blanco telescope), broad, unexplained spectral abso ...
Cosmic Distance Ladder Terrence Tao (UCLA)
... He reasoned that if one wanted to compute the orbit of Mars precisely, one must first figure out the orbit of the Earth. ...
... He reasoned that if one wanted to compute the orbit of Mars precisely, one must first figure out the orbit of the Earth. ...
Globular Cluster Formation in CDM Cosmologies
... In what kind of objects did such stars form, and how did they influence their environment… ...
... In what kind of objects did such stars form, and how did they influence their environment… ...
Working with Magnitudes and Color Indices 1 A quick review of
... As the individual stars evolve (age) in the galaxy, the color index of that galaxy will also evolve. The primary reason for this is that the rate of evolution depends on the mass of the star, as does the color index. Thus the high mass stars, which tend to pull the B −V index negative because of the ...
... As the individual stars evolve (age) in the galaxy, the color index of that galaxy will also evolve. The primary reason for this is that the rate of evolution depends on the mass of the star, as does the color index. Thus the high mass stars, which tend to pull the B −V index negative because of the ...
11 - Visual Magnitudes Project
... Attached is a finding chart for the brighter stars in the open star cluster named Praesepe or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is ...
... Attached is a finding chart for the brighter stars in the open star cluster named Praesepe or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is ...
Star Formation Efficiency VS Environment
... Estimators of TOTAL Star Formation Rate to be investigated: Radio Continuum High resolution radio observations HIPASS continuum catalog in preparation Mid Infrared Correlation of SFR with local galaxy density Tentative evidence that galaxies in highdensity regions are redder (see figure) ...
... Estimators of TOTAL Star Formation Rate to be investigated: Radio Continuum High resolution radio observations HIPASS continuum catalog in preparation Mid Infrared Correlation of SFR with local galaxy density Tentative evidence that galaxies in highdensity regions are redder (see figure) ...
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.