Starbirth - Lincoln-Sudbury Regional High School
... from above. In time, the dust may be exposed completely.* * Note that the directions in this description only apply to the photograph - not the physical object! ...
... from above. In time, the dust may be exposed completely.* * Note that the directions in this description only apply to the photograph - not the physical object! ...
Evolution of the barium abundance in the early Galaxy from a NLTE
... changes significantly with the metallicity (and the corresponding barium abundance) of the star (Fig. 3). This explains the dependence of the NLTE correction on [Fe/H] (Figs. 4 and 5). The lower the metallicity of the model, the deeper in the atmosphere is the line formation level (Fig. 3). – Anothe ...
... changes significantly with the metallicity (and the corresponding barium abundance) of the star (Fig. 3). This explains the dependence of the NLTE correction on [Fe/H] (Figs. 4 and 5). The lower the metallicity of the model, the deeper in the atmosphere is the line formation level (Fig. 3). – Anothe ...
Color-Magnitude Diagram Lab Manual
... 1. One technique that is useful for locating objects is called star hopping. This involves using the locations of known bright objects to find fainter ones. Although this virtual telescope can perfectly slew to an object by its right ascension and declination, real telescopes are not so precise. In ...
... 1. One technique that is useful for locating objects is called star hopping. This involves using the locations of known bright objects to find fainter ones. Although this virtual telescope can perfectly slew to an object by its right ascension and declination, real telescopes are not so precise. In ...
EXTREME NEUTRON STARS Christopher Thompson Canadian Institute for Theoretical Astrophysics University of Toronto
... Recent review: Woods & Thompson (astro-ph/0406133) ...
... Recent review: Woods & Thompson (astro-ph/0406133) ...
20_LectureOutline
... is now blue-white. Why? Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) ...
... is now blue-white. Why? Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) ...
Slides - Jung Y. Huang
... 3. Ability to image through scattering medium Scattering leads to loss of contrast Scattering gets worse at shorter wavelengths ...
... 3. Ability to image through scattering medium Scattering leads to loss of contrast Scattering gets worse at shorter wavelengths ...
The present lecture is the final lecture on the analysis of the power
... series of radial velocity measurements where the velocity is obtained by cross correlating the observed spectrum with a reference. The cross correlation will not only give the wavelength shift (radial velocity) between the spectrum and the reference it also allows an estimate of the error/scatter on ...
... series of radial velocity measurements where the velocity is obtained by cross correlating the observed spectrum with a reference. The cross correlation will not only give the wavelength shift (radial velocity) between the spectrum and the reference it also allows an estimate of the error/scatter on ...
Nanometer optical coherence tomography using
... [1] Huang et al.: Optical coherence tomography, Science, 1991 [2] Leitgeb et al.: Ultrahigh resolution Fourier domain optical coherence tomography, Optics Express, 2004 [3] Fuchs et al.: Optical coherence tomography using broad-bandwidth XUV and soft-X-ray radiation, Appl. Phys. B, 2012 [4] Henke, G ...
... [1] Huang et al.: Optical coherence tomography, Science, 1991 [2] Leitgeb et al.: Ultrahigh resolution Fourier domain optical coherence tomography, Optics Express, 2004 [3] Fuchs et al.: Optical coherence tomography using broad-bandwidth XUV and soft-X-ray radiation, Appl. Phys. B, 2012 [4] Henke, G ...
Lecture01-ASTA01 - University of Toronto
... • Even with the largest single telescopes on Earth, you still see only points of light when you look at stars, and any planets that might circle those stars are usually much too small and faint to be visible [but there are exceptions…] ...
... • Even with the largest single telescopes on Earth, you still see only points of light when you look at stars, and any planets that might circle those stars are usually much too small and faint to be visible [but there are exceptions…] ...
File
... relativity, mass affects the shape of space and the flow of time. Gravity results because space is warped by mass; the greater the mass, the greater the warp. However, at this time scientists did not know that the universe was expanding. It was assumed that after the big bang over 12 billion years a ...
... relativity, mass affects the shape of space and the flow of time. Gravity results because space is warped by mass; the greater the mass, the greater the warp. However, at this time scientists did not know that the universe was expanding. It was assumed that after the big bang over 12 billion years a ...
What is light? For the purposes of this class, light will refer to visible
... The normal line Between the incident and reflected rays, there is an imaginary line called the normal line which is perpendicular to the surface of the mirror. The angle between the incident ray and the normal line is called the angle of incidence. The angle of reflection is the angle between the no ...
... The normal line Between the incident and reflected rays, there is an imaginary line called the normal line which is perpendicular to the surface of the mirror. The angle between the incident ray and the normal line is called the angle of incidence. The angle of reflection is the angle between the no ...
Question paper
... 2 Which of the following descriptions cannot apply to the oscillations of a system ...
... 2 Which of the following descriptions cannot apply to the oscillations of a system ...
Stellar Evolution in the HR Diagram
... star’s atmosphere. This dust gets ejected into space during the TPAGB phase and can enshroud the star (at least in the optical). As a result, TP-AGB stars can be extremely bright in the near and mid-IR. • Because of dredge-up, the relative abundances of C and O can vary greatly from star to star. I ...
... star’s atmosphere. This dust gets ejected into space during the TPAGB phase and can enshroud the star (at least in the optical). As a result, TP-AGB stars can be extremely bright in the near and mid-IR. • Because of dredge-up, the relative abundances of C and O can vary greatly from star to star. I ...
Neutron Star
... In a supernova-like explosion of stars this massive, the core might collapse not to a neutron star, but directly to a black hole. Such stellar explosions are ...
... In a supernova-like explosion of stars this massive, the core might collapse not to a neutron star, but directly to a black hole. Such stellar explosions are ...
GUIDE space
... Hans Lippershey invented the telescope in the late16th century. Galileo Galilei improved the telescope and it revolutionised astronomy. Galileo could see more in the night sky than had ever been possible (details about Earth’s planetary neighbours, solar system and galaxy). Galileo was able to obser ...
... Hans Lippershey invented the telescope in the late16th century. Galileo Galilei improved the telescope and it revolutionised astronomy. Galileo could see more in the night sky than had ever been possible (details about Earth’s planetary neighbours, solar system and galaxy). Galileo was able to obser ...
ET_at_Science_Cafe
... Need Pwr ~10-6 Lceph . Few day Cepheid, would need 1028 J! Could be much less needed… have not done studies. Not useful for now. Not to melt, need accelerator at r>100 AU, capture radiation from area ~0.1AU2 Accelerators are efficient, well known physics at lower powers, but need large technology ex ...
... Need Pwr ~10-6 Lceph . Few day Cepheid, would need 1028 J! Could be much less needed… have not done studies. Not useful for now. Not to melt, need accelerator at r>100 AU, capture radiation from area ~0.1AU2 Accelerators are efficient, well known physics at lower powers, but need large technology ex ...
射电天文基础
... bandwidth of 100MHz. What is the flux density of this radar at 1km distance? A typical radio telescope can measure to the mJy level. At what distance will such radars disturb such radio astronomy measurements? 2009/08/24-28日 ...
... bandwidth of 100MHz. What is the flux density of this radar at 1km distance? A typical radio telescope can measure to the mJy level. At what distance will such radars disturb such radio astronomy measurements? 2009/08/24-28日 ...
The Tent We All Dwell In: Why the Sky is Blue
... 1. The light falling directly on the woman in the graphic is white, which means it contains an equal amount of all the color frequencies. None of the blue component has been scattered or washed out – if it had then the light would not be white. If the scattering effect is common to all parts of the ...
... 1. The light falling directly on the woman in the graphic is white, which means it contains an equal amount of all the color frequencies. None of the blue component has been scattered or washed out – if it had then the light would not be white. If the scattering effect is common to all parts of the ...
The Saha Equation
... Well, that doesn't seem to explain the situation with A and B stars, does it? The partition function Hold on a moment -- that calculation shows that stars must be REALLY hot in order for a collision to ionize a hydrogen atom in its ground state. But what about atoms in excited states? The first exc ...
... Well, that doesn't seem to explain the situation with A and B stars, does it? The partition function Hold on a moment -- that calculation shows that stars must be REALLY hot in order for a collision to ionize a hydrogen atom in its ground state. But what about atoms in excited states? The first exc ...
The Milky Way - National Tsing Hua University
... In a supernova-like explosion of stars this massive, the core might collapse not to a neutron star, but directly to a black hole. Such stellar explosions are ...
... In a supernova-like explosion of stars this massive, the core might collapse not to a neutron star, but directly to a black hole. Such stellar explosions are ...
Parameters of massive stars in the Milky Way and nearby galaxies
... the assumption that a small fraction of oxygen is trapped into dust. Thus, Esteban et al. obtain an oxygen abundance in M42 of 8.65 dex for the gas phase, increasing to 8.73 dex when a correction for dust depletion is taken into account. In view of their interest, Simon-Dı́az et al. (2005) have rece ...
... the assumption that a small fraction of oxygen is trapped into dust. Thus, Esteban et al. obtain an oxygen abundance in M42 of 8.65 dex for the gas phase, increasing to 8.73 dex when a correction for dust depletion is taken into account. In view of their interest, Simon-Dı́az et al. (2005) have rece ...
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.