Powerpoint
... DeMarque et al, ApJ, 426, 165, (1994) – modeling main sequence widths in clusters suggests a = 0.23 Woo and Demarque, AJ, 122, 1602 (2001) – empirically for low mass stars, overshoot is < 15% of the core radius. Core radius a better discriminant than pressure scale height. Brumme, Clune, and Toomre, ...
... DeMarque et al, ApJ, 426, 165, (1994) – modeling main sequence widths in clusters suggests a = 0.23 Woo and Demarque, AJ, 122, 1602 (2001) – empirically for low mass stars, overshoot is < 15% of the core radius. Core radius a better discriminant than pressure scale height. Brumme, Clune, and Toomre, ...
Here - Amateur Observers` Society of New York
... faint and require a medium to large size telescope to observe. Occasionally a comet will appear that is bright enough to be seen through binoculars or even visually. For mid-northern latitude observers the best time to view this pyramid of light is after dusk in the western sky during February and M ...
... faint and require a medium to large size telescope to observe. Occasionally a comet will appear that is bright enough to be seen through binoculars or even visually. For mid-northern latitude observers the best time to view this pyramid of light is after dusk in the western sky during February and M ...
a High-Mass Protostar with a Rotating Disk.
... disk does not appear perfectly symmetric around the dynamical center of the disk (Fig 2), we have not found any evidence for more than one active star formation center in the NGC 7538 S cloud core. The DCN map shows a secondary peak 600 to the northwest of the protostar (at Vlsr ∼ −59 km s−1 ), whic ...
... disk does not appear perfectly symmetric around the dynamical center of the disk (Fig 2), we have not found any evidence for more than one active star formation center in the NGC 7538 S cloud core. The DCN map shows a secondary peak 600 to the northwest of the protostar (at Vlsr ∼ −59 km s−1 ), whic ...
Dark fringes
... edge. They have same distance. And there is a dark fringe at the contact edge(e =0) because of half-wave loss. ...
... edge. They have same distance. And there is a dark fringe at the contact edge(e =0) because of half-wave loss. ...
2. Blackbody Radiation, Boltzmann Statistics, Temperature, and
... Gaussians widths add in quadrature (when convolving): btotal b12 b2 2 (Easy to show with the convolution theorem – try it!) Signal-to-noise-ratio, S/N Signal: The signal of a system increases linearly with power. Antenna temperature, TA: The signal (at a particular wavenumber, , or frequency, ...
... Gaussians widths add in quadrature (when convolving): btotal b12 b2 2 (Easy to show with the convolution theorem – try it!) Signal-to-noise-ratio, S/N Signal: The signal of a system increases linearly with power. Antenna temperature, TA: The signal (at a particular wavenumber, , or frequency, ...
OUR COSMIC NEIGHBORS Story of the Stars
... A long winding stream of stars was placed by primitive man at the “top of the sky.” According to a Greek legend, Draco represents the Dragon that guarded the Golden Apples in the Garden of Hesperides. This dragon was finally killed by Hercules and was placed in the sky in a position where it would n ...
... A long winding stream of stars was placed by primitive man at the “top of the sky.” According to a Greek legend, Draco represents the Dragon that guarded the Golden Apples in the Garden of Hesperides. This dragon was finally killed by Hercules and was placed in the sky in a position where it would n ...
WASP-5b: a dense, very hot Jupiter transiting a 12th
... (Wilson et al. 2008) and WASP-5b, all transiting, Jupiter-mass planets with orbital periods of less than 2 d, increases the number of such systems known from four to seven.1 It is notable that they show a large disparity in density (Fig. 4). WASP-5b is the densest of these systems, whereas WASP-4b i ...
... (Wilson et al. 2008) and WASP-5b, all transiting, Jupiter-mass planets with orbital periods of less than 2 d, increases the number of such systems known from four to seven.1 It is notable that they show a large disparity in density (Fig. 4). WASP-5b is the densest of these systems, whereas WASP-4b i ...
WASP-5b: a dense, very hot Jupiter transiting a 12th
... (Wilson et al. 2008) and WASP-5b, all transiting, Jupiter-mass planets with orbital periods of less than 2 d, increases the number of such systems known from four to seven.1 It is notable that they show a large disparity in density (Fig. 4). WASP-5b is the densest of these systems, whereas WASP-4b i ...
... (Wilson et al. 2008) and WASP-5b, all transiting, Jupiter-mass planets with orbital periods of less than 2 d, increases the number of such systems known from four to seven.1 It is notable that they show a large disparity in density (Fig. 4). WASP-5b is the densest of these systems, whereas WASP-4b i ...
Lecture 16, PPT version
... their speeds support the WD against gravitational collapse • WD acts a lot like a metal (same temperature and density throughout) ...
... their speeds support the WD against gravitational collapse • WD acts a lot like a metal (same temperature and density throughout) ...
Astronomy Timeline
... 130 B.C. - Greek astronomer Hipparchus develops the first accurate star map and star catalogue, and a reliable method to predict solar eclipses 46 B.C. - Julius Caesar, after consulting the astronomer Sosigenes of Alexandria, introduces the Julian Calendar, a regular year of 365 days divided into 12 ...
... 130 B.C. - Greek astronomer Hipparchus develops the first accurate star map and star catalogue, and a reliable method to predict solar eclipses 46 B.C. - Julius Caesar, after consulting the astronomer Sosigenes of Alexandria, introduces the Julian Calendar, a regular year of 365 days divided into 12 ...
Radiative Processes in Astrophysics
... thus the intensity is constant along a ray Another way of stating this is by the ...
... thus the intensity is constant along a ray Another way of stating this is by the ...
Definitions of Magnitudes and Surface Brightness
... Definitions of Magnitudes and Surface Brightness 1 The magnitude system 1.1 Apparent magnitude Astronomers are stuck with the antiquated old system of magnitudes and so a clear explanation of what this system is and how it relates to more sensible units is important. The magnitude scale is a logarit ...
... Definitions of Magnitudes and Surface Brightness 1 The magnitude system 1.1 Apparent magnitude Astronomers are stuck with the antiquated old system of magnitudes and so a clear explanation of what this system is and how it relates to more sensible units is important. The magnitude scale is a logarit ...
Molecular Cooling Rates (Neufeld, Lepp and Melnick 1995)
... Canonical picture • AGB stars are intermediate mass stars which are burning H or He in a shell • Stellar radius ~ 1 a.u. • Stellar luminosity ~ 104 L • Photospheric temperature ~ 2000 – 3000 K • Long period pulsational variables (P ~ 1 yr) • Outflowing envelopes (v ~ 10 km/s) driven by radiation p ...
... Canonical picture • AGB stars are intermediate mass stars which are burning H or He in a shell • Stellar radius ~ 1 a.u. • Stellar luminosity ~ 104 L • Photospheric temperature ~ 2000 – 3000 K • Long period pulsational variables (P ~ 1 yr) • Outflowing envelopes (v ~ 10 km/s) driven by radiation p ...
Word Doc - Imagineering Ezine
... band pass filters can be moved in front of the detector to reject all sources except one. Such techniques make it possible to have perhaps 10,000 different light receiver bands without interference. Make Your Own Optical Low Pass Filter A pretty good optical low pass filter can be made using a photo ...
... band pass filters can be moved in front of the detector to reject all sources except one. Such techniques make it possible to have perhaps 10,000 different light receiver bands without interference. Make Your Own Optical Low Pass Filter A pretty good optical low pass filter can be made using a photo ...
Giving a boost to atoms (pdf, 124 kB)
... direct amplification of atomic waves has now been observed by a group at MIT. On page 641 of this issue, Inouye et al.1 report phasecoherent matter-wave amplification using a Bose–Einstein condensate. According to the quantum or wavemechanics picture of matter, atoms have a wavelength that depends i ...
... direct amplification of atomic waves has now been observed by a group at MIT. On page 641 of this issue, Inouye et al.1 report phasecoherent matter-wave amplification using a Bose–Einstein condensate. According to the quantum or wavemechanics picture of matter, atoms have a wavelength that depends i ...
Stellar Dynamics
... unperturbed, orbit. As a simple illustration, suppose an isolated spherical cluster of stars, initially completely at rest, starts falling together. The stars will not simply all plunge together into the center. Instead, stars at different distances from the center, i.e. at different phases of their ...
... unperturbed, orbit. As a simple illustration, suppose an isolated spherical cluster of stars, initially completely at rest, starts falling together. The stars will not simply all plunge together into the center. Instead, stars at different distances from the center, i.e. at different phases of their ...
Light -1 - Physics
... As shown in the following figure, electromagnetic waves exist with an enormous range of frequencies. The ordered series of electromagnetic wave frequencies or wavelengths is called the electromagnetic ...
... As shown in the following figure, electromagnetic waves exist with an enormous range of frequencies. The ordered series of electromagnetic wave frequencies or wavelengths is called the electromagnetic ...
Levin - docuserv.ligo.caltech.edu
... LISA: the ESA/NASA space mission to detect gravitational waves. Binary black hole mergers Out to z=3 is one of the main targets ...
... LISA: the ESA/NASA space mission to detect gravitational waves. Binary black hole mergers Out to z=3 is one of the main targets ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.