AST 207 Homework 2 Due 17 September 2010
... Alternatively, you can calculate. If the star is on the meridian at sunset, the star is 6h ahead of the sun. That makes the sun’s position R.A. of the star - 6h. The sun is at zero right ascension on Mar. 21. So, convert the sun’s position from R.A. into time and add it to Mar. 21 to find the date. ...
... Alternatively, you can calculate. If the star is on the meridian at sunset, the star is 6h ahead of the sun. That makes the sun’s position R.A. of the star - 6h. The sun is at zero right ascension on Mar. 21. So, convert the sun’s position from R.A. into time and add it to Mar. 21 to find the date. ...
lec05_09oct2009
... also put limits on the visible albedo. The MOST satellite finds A(HD209458b)<0.25 (1s) (Jupiter=0.5, 300-700 nm). Why so dark? ...
... also put limits on the visible albedo. The MOST satellite finds A(HD209458b)<0.25 (1s) (Jupiter=0.5, 300-700 nm). Why so dark? ...
What causes the moon to change in appearance
... This is a photograph of the surface of Mars, taken in 2012 by the rover called Curiosity. Can you see all the rocks? There are some small and some very big valleys on Mars. The largest of them all may have been caused by the crust cracking and wind erosion. On Earth, many valleys are caused by erosi ...
... This is a photograph of the surface of Mars, taken in 2012 by the rover called Curiosity. Can you see all the rocks? There are some small and some very big valleys on Mars. The largest of them all may have been caused by the crust cracking and wind erosion. On Earth, many valleys are caused by erosi ...
FIVE NEW TRANSITS OF THE SUPER
... ( Ikoma et al. 2006), and a separation of gas from planetesimals at the magnetospheric ‘‘X point’’ (Sato et al. 2005). More recently, Harrington et al. (2007) found that the 8 m brightness temperature of HD 149026b exceeds its expected blackbody temperature, even if the planet is assumed to absorb ...
... ( Ikoma et al. 2006), and a separation of gas from planetesimals at the magnetospheric ‘‘X point’’ (Sato et al. 2005). More recently, Harrington et al. (2007) found that the 8 m brightness temperature of HD 149026b exceeds its expected blackbody temperature, even if the planet is assumed to absorb ...
On the path to Bose-Einstein condensate
... only experience a strong force over a narrow range of velocities for which the atoms have a range of Doppler shift approximately equal to the natural bandwidth of the laser (1 GHz for a typical He-Ne laser, although lasers for this experiments are usually frequency locked and have a much narrower ba ...
... only experience a strong force over a narrow range of velocities for which the atoms have a range of Doppler shift approximately equal to the natural bandwidth of the laser (1 GHz for a typical He-Ne laser, although lasers for this experiments are usually frequency locked and have a much narrower ba ...
General Astronomy - Stockton University
... A lightyear is too big a measurement to use within our Solar System. A better 'ruler' for these small distances is the Astronomical Unit, or AU An AU is the average distance from the Earth to the Sun. 1 AU = 93,000,000 Miles = 8.5 Lightminutes = 150 Million Kilometers = 0.0000162 Lightyears ...
... A lightyear is too big a measurement to use within our Solar System. A better 'ruler' for these small distances is the Astronomical Unit, or AU An AU is the average distance from the Earth to the Sun. 1 AU = 93,000,000 Miles = 8.5 Lightminutes = 150 Million Kilometers = 0.0000162 Lightyears ...
Optimal Occulter Design for Finding Extrasolar Planets
... use two spacecraft—a telescope and a specially shaped occulter, whose shape is specially designed to prevent all but a tiny fraction of the starlight from diffracting into the telescope. As the cost and observing cadence for such a mission will be driven largely by the separation between the two spa ...
... use two spacecraft—a telescope and a specially shaped occulter, whose shape is specially designed to prevent all but a tiny fraction of the starlight from diffracting into the telescope. As the cost and observing cadence for such a mission will be driven largely by the separation between the two spa ...
Dust in the Circumgalactic Medium of Low
... the Main Galaxy Sample from the data release 7 (Strauss et al. 2002) and use the magnitude limited selection r < 17.77. This produces a sample of 695,652 foreground galaxies for which two intrinsic properties are extracted from the MPA-JHU value-added catalog (Kauffmann et al. 2003; Brinchmann et al ...
... the Main Galaxy Sample from the data release 7 (Strauss et al. 2002) and use the magnitude limited selection r < 17.77. This produces a sample of 695,652 foreground galaxies for which two intrinsic properties are extracted from the MPA-JHU value-added catalog (Kauffmann et al. 2003; Brinchmann et al ...
Interacting binary stars Properties of some binary stars are
... • Due to expansion - e.g. the star swells to become a giant on leaving the main sequence • Because the Roche lobe shrinks: binary loses angular momentum, stars spiral together, Roche lobe closes in on one or both stars Describe a binary system as: • Detached: neither star fills its Roche lobe, both ...
... • Due to expansion - e.g. the star swells to become a giant on leaving the main sequence • Because the Roche lobe shrinks: binary loses angular momentum, stars spiral together, Roche lobe closes in on one or both stars Describe a binary system as: • Detached: neither star fills its Roche lobe, both ...
Approximate Theory of Rectangular Optical Waveguides
... LED (right) are very different. The latter has a strongly-modified emission pattern due to the scattering of waveguided modes out of the LED chip. ...
... LED (right) are very different. The latter has a strongly-modified emission pattern due to the scattering of waveguided modes out of the LED chip. ...
Biosignatures and Planetary Properties to be
... Beyond the Earth yet within our Solar System, our search for life and evidence about the origin of life will likely be confined to Mars, Europa, and Titan, along with small bodies such as comets, asteroids, and meteorite fragments derived therefrom. These objects present a wonderful opportunity for ...
... Beyond the Earth yet within our Solar System, our search for life and evidence about the origin of life will likely be confined to Mars, Europa, and Titan, along with small bodies such as comets, asteroids, and meteorite fragments derived therefrom. These objects present a wonderful opportunity for ...
may11-95 as a Word 6.0 doc - Lyle School of Engineering
... Which of the following detectors would be the best choice for a single mode optical fiber communication system if the optical source is a dfb laser with an emission wavelength of l = 1.3 µm? Explain your choice. a) a silicon PIN photodiode b) a silicon APD photodiode c) an indium gallium arsenide PI ...
... Which of the following detectors would be the best choice for a single mode optical fiber communication system if the optical source is a dfb laser with an emission wavelength of l = 1.3 µm? Explain your choice. a) a silicon PIN photodiode b) a silicon APD photodiode c) an indium gallium arsenide PI ...
ex-lup-v3
... crystallinity + light curve •Light Curve for the 2009 outbreak, 5 magnitude shift • Graph b) shows 9.7µm amorphous silicate feature •The paper states there are forsterite features at 10 & 11.2µm. From their plots this is not evident. At best all that can be seen is a shoulder at those wavelengths. ...
... crystallinity + light curve •Light Curve for the 2009 outbreak, 5 magnitude shift • Graph b) shows 9.7µm amorphous silicate feature •The paper states there are forsterite features at 10 & 11.2µm. From their plots this is not evident. At best all that can be seen is a shoulder at those wavelengths. ...
Age dating stellar populations in the near infrared
... The Brott models show a slow increase in the time to the appearance of an RSG which evolves with a decreasing mass of the initial RSGs. This effect is due to an increasing size in the hydrogen burning core of fast rotating stars. At high rotational velocities, stars evolve as if they were more massi ...
... The Brott models show a slow increase in the time to the appearance of an RSG which evolves with a decreasing mass of the initial RSGs. This effect is due to an increasing size in the hydrogen burning core of fast rotating stars. At high rotational velocities, stars evolve as if they were more massi ...
M.H. Lu, C.F. Madigan, and J.C. Sturm, "Experiment and modeling of conversion of substrate-wave-guided modes to surface-emitted light by substrate patterning," Mat. Res. Soc. Symp. Proc. 621, pp. Q3.7.1-Q3.7.6 (2000).
... and r2. For a sample with an 80 nm Alq3 layer, r1 and r2 were found to be 1.75 ± 0.12 and 0.30 ± 0.05 respectively, which implies a ηext /ηsub of 93 ± 20%. In comparison, classical ray optics gives ηext / ηsub = 55%, and our model gives ηext /ηsub = 83%. The model clearly gives much better agreement ...
... and r2. For a sample with an 80 nm Alq3 layer, r1 and r2 were found to be 1.75 ± 0.12 and 0.30 ± 0.05 respectively, which implies a ηext /ηsub of 93 ± 20%. In comparison, classical ray optics gives ηext / ηsub = 55%, and our model gives ηext /ηsub = 83%. The model clearly gives much better agreement ...
Astro340.Lecture17.30oct07
... • LPCs are thought to originate in the Oort Cloud • A spherical distribution of objects 100000 AU across • Perturbed by passing stars and molecular clouds • Called ‘Jupiter Family’ comets, they most likely formed near the space occupied by Jupiter and the other gas giants • The dynamical lifespan of ...
... • LPCs are thought to originate in the Oort Cloud • A spherical distribution of objects 100000 AU across • Perturbed by passing stars and molecular clouds • Called ‘Jupiter Family’ comets, they most likely formed near the space occupied by Jupiter and the other gas giants • The dynamical lifespan of ...
(BDA) Contribution To Space Weather Investigations
... produce high-speed solar wind streams (HSS). BDA can readily observe the coronal holes at all frequencies as depressions. • When HSS collide with the neighboring slow solar wind, they produce large-scale magnetized plasma structures known as the corotating interaction regions (CIRs). CIRs are respon ...
... produce high-speed solar wind streams (HSS). BDA can readily observe the coronal holes at all frequencies as depressions. • When HSS collide with the neighboring slow solar wind, they produce large-scale magnetized plasma structures known as the corotating interaction regions (CIRs). CIRs are respon ...
Dust attenuation in galaxies up to redshift 2 V. Buat
... Although dust is a minor component in galaxies, it captures a large fraction of the stellar emission, especially at short wavelengths. This process makes the direct observation of stellar populations from the UV to the near-IR insufficient to recover all the emitted photons. Thus reliable dust corre ...
... Although dust is a minor component in galaxies, it captures a large fraction of the stellar emission, especially at short wavelengths. This process makes the direct observation of stellar populations from the UV to the near-IR insufficient to recover all the emitted photons. Thus reliable dust corre ...
Polarization of light on reflection by some natural
... of the inherent periodicity exhibited by I($, E ) , in view of the fact that an analyser, such as a Glan-Thompson prism, transmits the same amount of light when its transmission plane is either at an angle $ or $+ n from the I direction, it should be possible to resolve I($, E ) into elementary comp ...
... of the inherent periodicity exhibited by I($, E ) , in view of the fact that an analyser, such as a Glan-Thompson prism, transmits the same amount of light when its transmission plane is either at an angle $ or $+ n from the I direction, it should be possible to resolve I($, E ) into elementary comp ...
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.