Optical communication systems
... transmit information from one place to another. Light is a type of electromagnetic radiation like radio waves. Today, infrared light is being used increasingly as the carrier for information in communication systems. The transmission medium is either free space or a light-carrying cable called a fib ...
... transmit information from one place to another. Light is a type of electromagnetic radiation like radio waves. Today, infrared light is being used increasingly as the carrier for information in communication systems. The transmission medium is either free space or a light-carrying cable called a fib ...
III Ionized Hydrogen (HII) Regions
... B is the total recombination coefficient A less contributions from recombinations directly into the ground state. This form of the photoionization equilibrium condition means that the following conditions will prevail in an optically thick nebula: 1. Photoionization by the stellar radiation field ...
... B is the total recombination coefficient A less contributions from recombinations directly into the ground state. This form of the photoionization equilibrium condition means that the following conditions will prevail in an optically thick nebula: 1. Photoionization by the stellar radiation field ...
June 2015 Newsletter - Newbury Astronomical Society
... appearing over the south eastern horizon. The most striking constellation now is the distinctive shape of Leo (the Lion) looking rather like the crouching Sphinx in Egypt. The brightest star in Leo is Regulus located almost on the ecliptic. Because it is located very close to the ecliptic it is ofte ...
... appearing over the south eastern horizon. The most striking constellation now is the distinctive shape of Leo (the Lion) looking rather like the crouching Sphinx in Egypt. The brightest star in Leo is Regulus located almost on the ecliptic. Because it is located very close to the ecliptic it is ofte ...
Interference3
... • Relation (2) represents that the coefficient of reflection from the surface of a denser medium is equal in magnitude to the coefficient of reflection from the surface of a rarer medium but opposite in sign. • Intensity of reflected light is the same for a ray incident from either side of the boun ...
... • Relation (2) represents that the coefficient of reflection from the surface of a denser medium is equal in magnitude to the coefficient of reflection from the surface of a rarer medium but opposite in sign. • Intensity of reflected light is the same for a ray incident from either side of the boun ...
Article PDF - IOPscience
... rotation period suggests that either WASP-19 is somewhat young (∼ 600 Myr old) or tidal interactions between the two bodies have caused the planet to spiral inward over its lifetime resulting in the spin-up of the star. Due to the detection of the rotation period, this system has the potential to pl ...
... rotation period suggests that either WASP-19 is somewhat young (∼ 600 Myr old) or tidal interactions between the two bodies have caused the planet to spiral inward over its lifetime resulting in the spin-up of the star. Due to the detection of the rotation period, this system has the potential to pl ...
CNO and F abundances in the barium star HD 123396
... the low eccentricities arise from tidal circularization (Boffin & Jorissen 1988; Han et al. 1995; Karakas et al. 2000; Izzard et al. 2010). In this context, CNO elements, along with s-process elements, are key tracers of the nucleosynthesis in the previous AGB progenitor, so they provide crucial const ...
... the low eccentricities arise from tidal circularization (Boffin & Jorissen 1988; Han et al. 1995; Karakas et al. 2000; Izzard et al. 2010). In this context, CNO elements, along with s-process elements, are key tracers of the nucleosynthesis in the previous AGB progenitor, so they provide crucial const ...
THE HOBBY-EBERLY TELESCOPE CHEMICAL ABUNDANCES OF
... stars. Our goal is to build up, over the next several years, the largest high-resolution database available for these objects to investigate, inter alia, the recent claim by Carollo et al. (2007) that there is a chemical difference between the so-called ‘‘inner’’ and ‘‘outer’’ halo populations. Furt ...
... stars. Our goal is to build up, over the next several years, the largest high-resolution database available for these objects to investigate, inter alia, the recent claim by Carollo et al. (2007) that there is a chemical difference between the so-called ‘‘inner’’ and ‘‘outer’’ halo populations. Furt ...
Determination of the distance to the Andromeda Galaxy using variable stars U
... where Δ fi is the differential flux of a star in the ith observation, f0 is the base line flux on the reference image, C is a zero-point constant, mi is the instrumental magnitude of a star in the ith observation, and a is a scaling factor (see below). The photometric package of DIA does not properly ...
... where Δ fi is the differential flux of a star in the ith observation, f0 is the base line flux on the reference image, C is a zero-point constant, mi is the instrumental magnitude of a star in the ith observation, and a is a scaling factor (see below). The photometric package of DIA does not properly ...
PPT
... Waves from two unrelated sources. Examples: light from two points on the sun or two atoms on a light bulb filament, or two people singing the same note. Incoherent intensities add. The average of constructive and destructive interference is no interference! Lecture 3, p 14 ...
... Waves from two unrelated sources. Examples: light from two points on the sun or two atoms on a light bulb filament, or two people singing the same note. Incoherent intensities add. The average of constructive and destructive interference is no interference! Lecture 3, p 14 ...
Terzan 5`s Pulsars Fastest
... o The spin rate of Ter5ad is also an important input for models that propose gravitional radiation as a mechanism for limiting the rotation rate of neutron stars [10,11]. o The difficulty in detecting this pulsar, due to its very low flux density (~80uJy at 2 GHz) and high eclipse fraction (~40% of ...
... o The spin rate of Ter5ad is also an important input for models that propose gravitional radiation as a mechanism for limiting the rotation rate of neutron stars [10,11]. o The difficulty in detecting this pulsar, due to its very low flux density (~80uJy at 2 GHz) and high eclipse fraction (~40% of ...
Electronic color charts for dielectric films on silicon
... film’s thickness simply by observing its color. However, the colors of dielectric films are typically either described in tables without showing the actual color, or a few silicon samples with different dielectric thicknesses and colors are kept for comparison purposes. In this article, we calculate ...
... film’s thickness simply by observing its color. However, the colors of dielectric films are typically either described in tables without showing the actual color, or a few silicon samples with different dielectric thicknesses and colors are kept for comparison purposes. In this article, we calculate ...
Unit 5B PowerPoint
... device (copper and iron) thermostat (n.) measures and maintains temperature thermonuclear (adj.): related to fusion, atomic power ...
... device (copper and iron) thermostat (n.) measures and maintains temperature thermonuclear (adj.): related to fusion, atomic power ...
Larger, high-res file, best for printing
... clusters, he referred to them as cluster-type variables; this terminology lasted for quite some time. But, Kiess wrote, “More surprising than the fact that variable stars are present in clusters, was the fact that in the great majority of instances the variation is of a new type.” These stars had sh ...
... clusters, he referred to them as cluster-type variables; this terminology lasted for quite some time. But, Kiess wrote, “More surprising than the fact that variable stars are present in clusters, was the fact that in the great majority of instances the variation is of a new type.” These stars had sh ...
PDF
... and its consequences for weather prediction, agriculture, economical activities and so on. Since ancient times, we have used stars as location beacons for our position on Earth and in space. Greek astronomer Hipparchus of Nicaea was able to find out that Earth’s axis was precessing by comparing his ...
... and its consequences for weather prediction, agriculture, economical activities and so on. Since ancient times, we have used stars as location beacons for our position on Earth and in space. Greek astronomer Hipparchus of Nicaea was able to find out that Earth’s axis was precessing by comparing his ...
Shape of a slowly rotating star measured by asteroseismology
... study of stellar shapes has only been possible with optical interferometry for a few of the fastest-rotating nearby stars. We report an asteroseismic measurement, with much better precision than interferometry, of the asphericity of an A-type star with a rotation period of 100 days. Using the fact t ...
... study of stellar shapes has only been possible with optical interferometry for a few of the fastest-rotating nearby stars. We report an asteroseismic measurement, with much better precision than interferometry, of the asphericity of an A-type star with a rotation period of 100 days. Using the fact t ...
The thopograpy of Venus revealed at 1 micron
... the Venus nightside, at 1 micron, during some days, to show the nature and properties of the details visible and the amateur equipment potential. Each session started 10 minutes after the sunset and finished when the planet lowered under 5° of altitude. The CCD device was set to a temperature of 5.0 ...
... the Venus nightside, at 1 micron, during some days, to show the nature and properties of the details visible and the amateur equipment potential. Each session started 10 minutes after the sunset and finished when the planet lowered under 5° of altitude. The CCD device was set to a temperature of 5.0 ...
Standard 1 Objectives 1 and 2 Workbook
... c. Describe the nebular theory of solar system formation and the evidence supporting it (e.g., solar system structure due to gravity, motion and temperature; composition and age of meteorites; observations of newly forming stars). d. Explain that heavy elements found on Earth are formed in stars. e. ...
... c. Describe the nebular theory of solar system formation and the evidence supporting it (e.g., solar system structure due to gravity, motion and temperature; composition and age of meteorites; observations of newly forming stars). d. Explain that heavy elements found on Earth are formed in stars. e. ...
Document
... •We have studied X-ray pump-probe spectra with coherent and incoherent pump radiation as well as with CW and pulsed light sources. •Phase of coherent pump radiation is transferred to nuclear or electronic wave packet. This makes trajectory of the wave packet and X-ray pump-probe spectra sensitive to ...
... •We have studied X-ray pump-probe spectra with coherent and incoherent pump radiation as well as with CW and pulsed light sources. •Phase of coherent pump radiation is transferred to nuclear or electronic wave packet. This makes trajectory of the wave packet and X-ray pump-probe spectra sensitive to ...
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.