October 2005 NSTAR - North Houston Astronomy Club
... such as a Telrad, or as important as the proper way to clean your optics (Hacks #34 and #52). But did you know that when you are comfortably seated at your eyepiece (instead of standing) you improve your performance by an amount that is the same as having a telescope up to 2 inches bigger (Hack #60) ...
... such as a Telrad, or as important as the proper way to clean your optics (Hacks #34 and #52). But did you know that when you are comfortably seated at your eyepiece (instead of standing) you improve your performance by an amount that is the same as having a telescope up to 2 inches bigger (Hack #60) ...
View slides as PowerPoint
... achieve contrast performance better than ground AO and approaching that of a space platform • Operate at visible wavelengths with 1-m telescope, deploy coronagraph with precision wavefront control • Small telescope can still be very sensitive to extended surface brightness • Debris disk targets a go ...
... achieve contrast performance better than ground AO and approaching that of a space platform • Operate at visible wavelengths with 1-m telescope, deploy coronagraph with precision wavefront control • Small telescope can still be very sensitive to extended surface brightness • Debris disk targets a go ...
Angular Measurement
... •Thus, the half-circle that stretches from horizon to horizon, passing directly overhead and spanning the portion of the sky visible to one person at any one time, ...
... •Thus, the half-circle that stretches from horizon to horizon, passing directly overhead and spanning the portion of the sky visible to one person at any one time, ...
Distances of the Stars
... • Parallaxes for ~100,000 stars! • Got 10% distances out to 100 pc • Good distances out to 1000 pc ...
... • Parallaxes for ~100,000 stars! • Got 10% distances out to 100 pc • Good distances out to 1000 pc ...
Index to issues
... This general index covers topics in feature articles and the columns Astronomical Teachniques, Teachers' Challenge, and Photons Focused on: but does not index the seasonal Teachers Sky Planning Calendar, most RAP Sheets, the editor's My View of the Classroom Universe. Each listing consists of the Is ...
... This general index covers topics in feature articles and the columns Astronomical Teachniques, Teachers' Challenge, and Photons Focused on: but does not index the seasonal Teachers Sky Planning Calendar, most RAP Sheets, the editor's My View of the Classroom Universe. Each listing consists of the Is ...
Physivd Preliminary Module 8.5 The Cosmic Engine
... reduces going to higher latitudes using diagrams. relate the model of the solar system to the observed sky examine information collected to assist in predicting events such as appearances of comets, eclipses and other solar system phenomena.\ collate information gained from planetary research to sup ...
... reduces going to higher latitudes using diagrams. relate the model of the solar system to the observed sky examine information collected to assist in predicting events such as appearances of comets, eclipses and other solar system phenomena.\ collate information gained from planetary research to sup ...
giant molecular clouds
... Large masses of Giant Molecular Clouds => Stars do not form isolated, but in large groups, called Open Clusters of Stars. ...
... Large masses of Giant Molecular Clouds => Stars do not form isolated, but in large groups, called Open Clusters of Stars. ...
Annual report 2002 - Département d`Astrophysique, Géophysique et
... A seismic modelling of the massive star 16 Lac has been made. We have compared a new spectroscopic mode identification with a photometric identification based upon a non-adiabatic description of the eigenfunctions in the star atmosphere. Numerous theoretical models have been computed in order to sel ...
... A seismic modelling of the massive star 16 Lac has been made. We have compared a new spectroscopic mode identification with a photometric identification based upon a non-adiabatic description of the eigenfunctions in the star atmosphere. Numerous theoretical models have been computed in order to sel ...
Chapter 12
... internal temperature is not high enough to produce fusion. These objects radiate energy away in the form of light. That energy comes from gravitational energy converted to heat. Once they reach the Main Sequence, The temperature is high (10 million K) and fusion starts. The contraction stops because ...
... internal temperature is not high enough to produce fusion. These objects radiate energy away in the form of light. That energy comes from gravitational energy converted to heat. Once they reach the Main Sequence, The temperature is high (10 million K) and fusion starts. The contraction stops because ...
instructions
... telescopes avoid this problem, and are generally cheaper to manufacture for a given sized aperture (the main lens or mirror used to catch the incoming light). As a result, most high-performance optical telescopes, including the Hubble Space Telescope, are reflector designs. ...
... telescopes avoid this problem, and are generally cheaper to manufacture for a given sized aperture (the main lens or mirror used to catch the incoming light). As a result, most high-performance optical telescopes, including the Hubble Space Telescope, are reflector designs. ...
Hertzsprung-Russell Diagram
... The main sequence is not really a line. The sun fits on the main sequence when it has a luminosity of 0.5 to 1.5 the actual luminosity. The reason is due to the age and composition of the star. ...
... The main sequence is not really a line. The sun fits on the main sequence when it has a luminosity of 0.5 to 1.5 the actual luminosity. The reason is due to the age and composition of the star. ...
script
... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
Telescopes
... In which mounting system does the field rotate at the focal plane during (long) exposure ? ...
... In which mounting system does the field rotate at the focal plane during (long) exposure ? ...
1 Ay 122a Fall 2015/16 – HOMEWORK #3
... First, you will need the curves for the diffraction efficiency of the reflection grating in each band to adjust the total instrumental throughput (also included among the files at the link above). While the background against which you are detecting your sources is the same, it is now being disperse ...
... First, you will need the curves for the diffraction efficiency of the reflection grating in each band to adjust the total instrumental throughput (also included among the files at the link above). While the background against which you are detecting your sources is the same, it is now being disperse ...
Chap. 2: Known the Heavens
... are fixed on its surface • In the sphere, all stars are assumed in the same distance • The Earth is stationary and at the center of the sphere • Note that it is an imaginary object that has no basis in physical reality • However, it is a model that remains to be very useful for positional astronomy ...
... are fixed on its surface • In the sphere, all stars are assumed in the same distance • The Earth is stationary and at the center of the sphere • Note that it is an imaginary object that has no basis in physical reality • However, it is a model that remains to be very useful for positional astronomy ...
Sky, Celestial Sphere and Constellations
... (changes direction) as it go from one air layer to another of different densities.. When there is turbulence in the atmosphere refraction is not uniform or steady, changes from moment to moment, changing the direction of light slightly all the time. Stars are so far away that, their angular diameter ...
... (changes direction) as it go from one air layer to another of different densities.. When there is turbulence in the atmosphere refraction is not uniform or steady, changes from moment to moment, changing the direction of light slightly all the time. Stars are so far away that, their angular diameter ...
STUDY GUIDE:
... to become black holes, whose gravitational fields are strong enough to block light. A white dwarf occurs when a small to middle-mass star uses up its fuel, and collapses. As it collapses, much of its atmosphere disburses into space as gas and dust from which new stars will be formed. After about a b ...
... to become black holes, whose gravitational fields are strong enough to block light. A white dwarf occurs when a small to middle-mass star uses up its fuel, and collapses. As it collapses, much of its atmosphere disburses into space as gas and dust from which new stars will be formed. After about a b ...
Star Classification - University of Louisville
... surface temperatures are much higher, and shine white instead of red. When the Sun comes to the end of its life, it will become a White Dwarf. It will be much smaller than it is now, not quite as bright but twice as hot. Its matter (particles) will be more densely-packed together. ...
... surface temperatures are much higher, and shine white instead of red. When the Sun comes to the end of its life, it will become a White Dwarf. It will be much smaller than it is now, not quite as bright but twice as hot. Its matter (particles) will be more densely-packed together. ...
Answer to question 1 - Northwestern University
... Bottom line we now have (1) a ruler measurement to the sun and astrometry to give us accurate positions to the (2) A satellite dedicated to the [boring, tedious] task of accurately measuring star positions to yield accurate (to the few percent level) the distances to “Cepheid Variables.” And Cephei ...
... Bottom line we now have (1) a ruler measurement to the sun and astrometry to give us accurate positions to the (2) A satellite dedicated to the [boring, tedious] task of accurately measuring star positions to yield accurate (to the few percent level) the distances to “Cepheid Variables.” And Cephei ...
E:\2012-2013\SSU\PHS 207spring 2013\3rd test 4
... 1. Why are Cepheid variable stars important in our study of the Milky Way galaxy? By monitoring a Cepheid star its distance from us can be calculated. Since we assume that nearly all the stars in a cluster are nearly the same age, we can determine the cluster’s age and distance ad some range of the ...
... 1. Why are Cepheid variable stars important in our study of the Milky Way galaxy? By monitoring a Cepheid star its distance from us can be calculated. Since we assume that nearly all the stars in a cluster are nearly the same age, we can determine the cluster’s age and distance ad some range of the ...
Answers
... stars with different starting masses. ☆ Select a different starting mass for your star in the ‘Star Properties’ banner. ☆ Use the Hertzsprung-Russell diagram tab, click play to watch your new stars evolution. ☆ Try out a few different masses then answer the following questions. 1. Using the Hertzspr ...
... stars with different starting masses. ☆ Select a different starting mass for your star in the ‘Star Properties’ banner. ☆ Use the Hertzsprung-Russell diagram tab, click play to watch your new stars evolution. ☆ Try out a few different masses then answer the following questions. 1. Using the Hertzspr ...
The Stellar Cycle
... • The resulting outward pressure which keeps the electrons apart is called electron degeneracy pressure – this is what balances the weight. • Only if more energy drives the electrons into higher energy states, can the density increase. • Adding mass can drive electrons to higher energies so star shr ...
... • The resulting outward pressure which keeps the electrons apart is called electron degeneracy pressure – this is what balances the weight. • Only if more energy drives the electrons into higher energy states, can the density increase. • Adding mass can drive electrons to higher energies so star shr ...
The H-R Diagram
... The Random Walk towards the Spectral Types… • White Stars, with prominent hydrogen lines. Called them “A stars.” • Blue-white stars, with less prominent H lines, and weak helium lines. Called them “B stars” • Then, no more in this color direction, so skip some letters and… Cream colored stars, with ...
... The Random Walk towards the Spectral Types… • White Stars, with prominent hydrogen lines. Called them “A stars.” • Blue-white stars, with less prominent H lines, and weak helium lines. Called them “B stars” • Then, no more in this color direction, so skip some letters and… Cream colored stars, with ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.